752 lines
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752 lines
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<ul><li><a href="../inweb/index.html">inweb</a></li>
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<!--Weave of 'String Manipulation' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="index.html">foundation</a></li><li><a href="index.html#4">Chapter 4: Text Handling</a></li><li><b>String Manipulation</b></li></ul></div>
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<p class="purpose">Convenient routines for manipulating strings of text.</p>
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<ul class="toc"><li><a href="4-sm.html#SP1">§1. Strings are streams</a></li><li><a href="4-sm.html#SP2">§2. New strings</a></li><li><a href="4-sm.html#SP4">§4. Converting from C strings</a></li><li><a href="4-sm.html#SP6">§6. Converting to C strings</a></li><li><a href="4-sm.html#SP7">§7. Converting to integers</a></li><li><a href="4-sm.html#SP8">§8. Length</a></li><li><a href="4-sm.html#SP9">§9. Position markers</a></li><li><a href="4-sm.html#SP13">§13. Character operations</a></li><li><a href="4-sm.html#SP15">§15. Truncation</a></li><li><a href="4-sm.html#SP16">§16. Indentation</a></li><li><a href="4-sm.html#SP17">§17. Copying</a></li><li><a href="4-sm.html#SP19">§19. Comparisons</a></li><li><a href="4-sm.html#SP23">§23. White space</a></li><li><a href="4-sm.html#SP25">§25. Deleting characters</a></li><li><a href="4-sm.html#SP26">§26. Substrings</a></li><li><a href="4-sm.html#SP27">§27. Shim for literal storage</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Strings are streams. </b>Although Foundation provides limited facilities for handling standard or
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wide C-style strings — that is, null-terminated arrays of <span class="extract"><span class="extract-syntax">char</span></span> or
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<span class="extract"><span class="extract-syntax">wchar_t</span></span> — these are not encouraged.
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</p>
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<p class="commentary">Instead, a standard string for a program using Foundation is nothing more than
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a text stream (see Chapter 2). These are unbounded in size, with memory
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allocation being automatic; they are encoded as an array of Unicode code
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points (not as UTF-8, -16 or -32); and they do not use a null or indeed any
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terminator. This has the advantage that finding the length of a string, and
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appending characters to it, run in constant time regardless of the string's
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length. It is is entirely feasible to write hundreds of megabytes of
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output into a string, if that's useful, and no substantial slowing down
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will occur in handling the result (except, of course, that printing it
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out on screen would take a while). Strings are also very well protected
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against buffer overruns.
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</p>
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<p class="commentary">The present section of code provides convenient routines for creating,
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duplicating, modifying and examining such strings.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. New strings. </b>Sometimes we want to make a new string in the sense of allocating more
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memory to hold it. These objects won't automatically be destroyed, so we
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shouldn't call these routines too casually. If we need a string just for
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some space to play with for a short while, it's better to create one
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with <span class="extract"><span class="extract-syntax">TEMPORARY_TEXT</span></span> and then get rid of it with <span class="extract"><span class="extract-syntax">DISCARD_TEXT</span></span>, macros
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defined in Chapter 2.
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</p>
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<p class="commentary">The capacity of these strings is unlimited in principle, and the number
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here is just the size of the initial memory block, which is fastest to
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access.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::new</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Str::new</span></span>:<br/><a href="4-sm.html#SP3">§3</a><br/>Debugging Log - <a href="2-dl.html#SP4_1">§4.1</a><br/>Dictionaries - <a href="2-dct.html#SP7_3_1">§7.3.1</a><br/>Command Line Arguments - <a href="3-cla.html#SP6">§6</a>, <a href="3-cla.html#SP11">§11</a><br/>HTML - <a href="5-htm.html#SP27_2">§27.2</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a><br/>Version Numbers - <a href="7-vn.html#SP7">§7</a><br/>Web Structure - <a href="8-ws.html#SP5_2">§5.2</a>, <a href="8-ws.html#SP6_1">§6.1</a>, <a href="8-ws.html#SP7_2_1">§7.2.1</a>, <a href="8-ws.html#SP7_2_2_1">§7.2.2.1</a><br/>Build Files - <a href="8-bf.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-sm.html#SP2" class="function-link"><span class="function-syntax">Str::new_with_capacity</span></a><span class="plain-syntax">(32);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::new_with_capacity</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">Str::new_with_capacity</span></span>:<br/>Pathnames - <a href="3-pth.html#SP4">§4</a><br/>Filenames - <a href="3-fln.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP26" class="function-link"><span class="function-syntax">Streams::open_to_memory</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">c</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::dispose_of</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">Str::dispose_of</span></span>:<br/>Dictionaries - <a href="2-dct.html#SP7_3_2">§7.3.2</a>, <a href="2-dct.html#SP11">§11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">text</span><span class="plain-syntax">) </span><span class="identifier-syntax">STREAM_CLOSE</span><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Duplication of an existing string is complicated only by the issue that
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we want the duplicate always to be writeable, so that <span class="extract"><span class="extract-syntax">NULL</span></span> can't be
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duplicated as <span class="extract"><span class="extract-syntax">NULL</span></span>.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::duplicate</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">Str::duplicate</span></span>:<br/>Dictionaries - <a href="2-dct.html#SP7_3_1">§7.3.1</a><br/>Trees - <a href="2-trs.html#SP7">§7</a>, <a href="2-trs.html#SP9">§9</a><br/>Command Line Arguments - <a href="3-cla.html#SP5_1">§5.1</a><br/>Time - <a href="3-tm.html#SP6">§6</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a><br/>Version Numbers - <a href="7-vn.html#SP7_1">§7.1</a><br/>Web Structure - <a href="8-ws.html#SP7_2_1">§7.2.1</a>, <a href="8-ws.html#SP7_2_2_1">§7.2.2.1</a>, <a href="8-ws.html#SP7_2_2_3_1">§7.2.2.3.1</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP7_1">§7.1</a><br/>Web Modules - <a href="8-wm.html#SP2">§2</a><br/>Build Files - <a href="8-bf.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">E</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-sm.html#SP2" class="function-link"><span class="function-syntax">Str::new</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP26" class="function-link"><span class="function-syntax">Streams::open_to_memory</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">)+4)) {</span>
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<span class="plain-syntax"> </span><a href="2-str.html#SP42" class="function-link"><span class="function-syntax">Streams::copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">E</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Converting from C strings. </b>Here we open text streams initially equal to the given C strings, and
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with the capacity of the initial block large enough to hold the whole
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thing plus a little extra, for efficiency's sake.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::new_from_wide_string</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">Str::new_from_wide_string</span></span>:<br/>Command Line Arguments - <a href="3-cla.html#SP5">§5</a>, <a href="3-cla.html#SP14">§14</a><br/>Pathnames - <a href="3-pth.html#SP3">§3</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP28" class="function-link"><span class="function-syntax">Streams::open_from_wide_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::new_from_ISO_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP28_1" class="function-link"><span class="function-syntax">Streams::open_from_ISO_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::new_from_UTF8_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP28_2" class="function-link"><span class="function-syntax">Streams::open_from_UTF8_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::new_from_locale_string</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">Str::new_from_locale_string</span></span>:<br/>Pathnames - <a href="3-pth.html#SP2">§2</a>, <a href="3-pth.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP32" class="function-link"><span class="function-syntax">Streams::open_from_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>And sometimes we want to use an existing stream object:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::from_wide_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">c_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP28" class="function-link"><span class="function-syntax">Streams::open_from_wide_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">c_string</span><span class="plain-syntax">) == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::from_locale_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">c_string</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-str.html#SP32" class="function-link"><span class="function-syntax">Streams::open_from_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">c_string</span><span class="plain-syntax">) == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. Converting to C strings. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_to_ISO_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP30" class="function-link"><span class="function-syntax">Streams::write_as_ISO_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_to_UTF8_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP31" class="function-link"><span class="function-syntax">Streams::write_as_UTF8_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_to_wide_string</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP29" class="function-link"><span class="function-syntax">Streams::write_as_wide_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_to_locale_string</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">Str::copy_to_locale_string</span></span>:<br/>Pathnames - <a href="3-pth.html#SP9">§9</a>, <a href="3-pth.html#SP10">§10</a><br/>Filenames - <a href="3-fln.html#SP10">§10</a>, <a href="3-fln.html#SP12">§12</a><br/>Directories - <a href="3-drc.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP32" class="function-link"><span class="function-syntax">Streams::write_as_locale_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">buffer_size</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Converting to integers. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::atoi</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">Str::atoi</span></span>:<br/>Command Line Arguments - <a href="3-cla.html#SP12">§12</a><br/>HTML - <a href="5-htm.html#SP27_2">§27.2</a><br/>Version Numbers - <a href="7-vn.html#SP10">§10</a><br/>Web Structure - <a href="8-ws.html#SP7_3_3_2">§7.3.3.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">index</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[32];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">index</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> ((</span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="constant-syntax">31</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">))); </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++] = (</span><span class="reserved-syntax">char</span><span class="plain-syntax">) </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">atoi</span><span class="plain-syntax">(</span><span class="identifier-syntax">buffer</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. Length. </b>A puritan would return a <span class="extract"><span class="extract-syntax">size_t</span></span> here, but I am not a puritan.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::len</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">Str::len</span></span>:<br/><a href="4-sm.html#SP3">§3</a>, <a href="4-sm.html#SP7">§7</a>, <a href="4-sm.html#SP10">§10</a>, <a href="4-sm.html#SP11">§11</a>, <a href="4-sm.html#SP12">§12</a>, <a href="4-sm.html#SP13">§13</a>, <a href="4-sm.html#SP14">§14</a>, <a href="4-sm.html#SP15">§15</a>, <a href="4-sm.html#SP17">§17</a>, <a href="4-sm.html#SP19">§19</a>, <a href="4-sm.html#SP20">§20</a>, <a href="4-sm.html#SP21">§21</a>, <a href="4-sm.html#SP22">§22</a>, <a href="4-sm.html#SP24">§24</a>, <a href="4-sm.html#SP25">§25</a>, <a href="4-sm.html#SP26">§26</a><br/>Debugging Log - <a href="2-dl.html#SP9">§9</a><br/>Command Line Arguments - <a href="3-cla.html#SP13">§13</a>, <a href="3-cla.html#SP14">§14</a>, <a href="3-cla.html#SP14_1">§14.1</a><br/>Pathnames - <a href="3-pth.html#SP4">§4</a>, <a href="3-pth.html#SP5">§5</a>, <a href="3-pth.html#SP7">§7</a>, <a href="3-pth.html#SP8">§8</a><br/>Filenames - <a href="3-fln.html#SP2">§2</a>, <a href="3-fln.html#SP3">§3</a>, <a href="3-fln.html#SP5">§5</a>, <a href="3-fln.html#SP8">§8</a>, <a href="3-fln.html#SP9">§9</a><br/>Tries and Avinues - <a href="4-taa.html#SP2_1">§2.1</a><br/>Pattern Matching - <a href="4-pm.html#SP3">§3</a>, <a href="4-pm.html#SP4">§4</a>, <a href="4-pm.html#SP10">§10</a>, <a href="4-pm.html#SP11_3">§11.3</a>, <a href="4-pm.html#SP14">§14</a><br/>HTML - <a href="5-htm.html#SP8">§8</a>, <a href="5-htm.html#SP17">§17</a><br/>Epub Ebooks - <a href="5-ee.html#SP7_1">§7.1</a>, <a href="5-ee.html#SP7_2_3">§7.2.3</a>, <a href="5-ee.html#SP7_2_4">§7.2.4</a><br/>Version Numbers - <a href="7-vn.html#SP7">§7</a>, <a href="7-vn.html#SP7_1">§7.1</a>, <a href="7-vn.html#SP10">§10</a><br/>Web Structure - <a href="8-ws.html#SP5_4">§5.4</a>, <a href="8-ws.html#SP5_4_1">§5.4.1</a>, <a href="8-ws.html#SP5_4_1_1">§5.4.1.1</a>, <a href="8-ws.html#SP5_4_1_2">§5.4.1.2</a>, <a href="8-ws.html#SP7_3">§7.3</a>, <a href="8-ws.html#SP7_3_3_1">§7.3.3.1</a>, <a href="8-ws.html#SP7_2_2_3_1">§7.2.2.3.1</a>, <a href="8-ws.html#SP7_2_2_4">§7.2.2.4</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP5">§5</a>, <a href="8-bdfw.html#SP6">§6</a><br/>Build Files - <a href="8-bf.html#SP3">§3</a>, <a href="8-bf.html#SP4">§4</a>, <a href="8-bf.html#SP5">§5</a>, <a href="8-bf.html#SP6">§6</a>, <a href="8-bf.html#SP9">§9</a><br/>Simple Tangler - <a href="8-st.html#SP7">§7</a>, <a href="8-st.html#SP7_1">§7.1</a>, <a href="8-st.html#SP7_2_4">§7.2.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-str.html#SP38" class="function-link"><span class="function-syntax">Streams::get_position</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. Position markers. </b>A position marker is a lightweight way to refer to a particular position
|
|
in a given string. Position 0 is before the first character; if, for
|
|
example, the string contains the word "gazpacho", then position 8 represents
|
|
the end of the string, after the "o". Negative positions are not allowed,
|
|
but positive ones well past the end of the string are legal. (Doing things
|
|
at those positions may well not be, of course.)
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">index</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">} </span><span class="reserved-syntax">string_position</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>The structure string_position is private to this section.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>You can then find a position in a given string thus:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="function-syntax">Str::start</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">Str::start</span></span>:<br/><a href="4-sm.html#SP12">§12</a>, <a href="4-sm.html#SP20">§20</a>, <a href="4-sm.html#SP24">§24</a><br/>Pathnames - <a href="3-pth.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="function-syntax">Str::at</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">Str::at</span></span>:<br/><a href="4-sm.html#SP7">§7</a>, <a href="4-sm.html#SP13">§13</a>, <a href="4-sm.html#SP14">§14</a>, <a href="4-sm.html#SP15">§15</a>, <a href="4-sm.html#SP17">§17</a>, <a href="4-sm.html#SP25">§25</a><br/>Pathnames - <a href="3-pth.html#SP4">§4</a>, <a href="3-pth.html#SP5">§5</a>, <a href="3-pth.html#SP8">§8</a><br/>Filenames - <a href="3-fln.html#SP2">§2</a>, <a href="3-fln.html#SP3">§3</a>, <a href="3-fln.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> > </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)) </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> = </span><span class="identifier-syntax">i</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="function-syntax">Str::end</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">Str::end</span></span>:<br/><a href="4-sm.html#SP12">§12</a><br/>Pathnames - <a href="3-pth.html#SP8">§8</a><br/>Filenames - <a href="3-fln.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">); </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b>And you can step forwards or backwards:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="function-syntax">Str::back</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">Str::back</span></span>:<br/><a href="4-sm.html#SP12">§12</a><br/>Filenames - <a href="3-fln.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">--; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
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|
<span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="function-syntax">Str::forward</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">Str::forward</span></span>:<br/><a href="4-sm.html#SP7">§7</a>, <a href="4-sm.html#SP17">§17</a>, <a href="4-sm.html#SP20">§20</a>, <a href="4-sm.html#SP24">§24</a>, <a href="4-sm.html#SP25">§25</a><br/>Filenames - <a href="3-fln.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">++; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
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|
<span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="function-syntax">Str::plus</span><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">increment</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> += </span><span class="identifier-syntax">increment</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
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|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::width_between</span><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P1</span><span class="plain-syntax">, </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P1</span><span class="plain-syntax">.</span><span class="identifier-syntax">S</span><span class="plain-syntax"> != </span><span class="identifier-syntax">P2</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"positions are in different strings"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P2</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> - </span><span class="identifier-syntax">P1</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::in_range</span><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::index</span><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b>This leads to the following convenient loop macros:
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|
</p>
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|
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">ST</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::start</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ST</span><span class="plain-syntax">); </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">); </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">++)</span>
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|
<span class="definition-keyword">define</span> <span class="identifier-syntax">LOOP_BACKWARDS_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">ST</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::back</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ST</span><span class="plain-syntax">)); </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">--)</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. Character operations. </b>How to get at individual characters, then, now that we can refer to positions:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="function-syntax">Str::get</span><button class="popup" onclick="togglePopup('usagePopup15')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup15">Usage of <span class="code-font"><span class="function-syntax">Str::get</span></span>:<br/><a href="4-sm.html#SP7">§7</a>, <a href="4-sm.html#SP17">§17</a>, <a href="4-sm.html#SP20">§20</a>, <a href="4-sm.html#SP22">§22</a>, <a href="4-sm.html#SP23">§23</a>, <a href="4-sm.html#SP24">§24</a>, <a href="4-sm.html#SP25">§25</a>, <a href="4-sm.html#SP26">§26</a><br/>Dictionaries - <a href="2-dct.html#SP4">§4</a><br/>Pathnames - <a href="3-pth.html#SP4">§4</a>, <a href="3-pth.html#SP5">§5</a><br/>Filenames - <a href="3-fln.html#SP2">§2</a>, <a href="3-fln.html#SP3">§3</a>, <a href="3-fln.html#SP7">§7</a>, <a href="3-fln.html#SP8">§8</a>, <a href="3-fln.html#SP9">§9</a><br/>Shell - <a href="3-shl.html#SP1">§1</a><br/>Pattern Matching - <a href="4-pm.html#SP5">§5</a><br/>HTML - <a href="5-htm.html#SP26">§26</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a><br/>Version Numbers - <a href="7-vn.html#SP7">§7</a>, <a href="7-vn.html#SP10">§10</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP7_2">§7.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-str.html#SP40" class="function-link"><span class="function-syntax">Streams::get_char_at_index</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="function-syntax">Str::get_at</span><button class="popup" onclick="togglePopup('usagePopup16')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup16">Usage of <span class="code-font"><span class="function-syntax">Str::get_at</span></span>:<br/><a href="4-sm.html#SP20">§20</a>, <a href="4-sm.html#SP21">§21</a>, <a href="4-sm.html#SP24">§24</a>, <a href="4-sm.html#SP26">§26</a><br/>Pathnames - <a href="3-pth.html#SP7">§7</a><br/>Filenames - <a href="3-fln.html#SP5">§5</a><br/>Tries and Avinues - <a href="4-taa.html#SP2">§2</a><br/>Pattern Matching - <a href="4-pm.html#SP3">§3</a>, <a href="4-pm.html#SP4">§4</a>, <a href="4-pm.html#SP11">§11</a>, <a href="4-pm.html#SP11_4">§11.4</a>, <a href="4-pm.html#SP11_6">§11.6</a>, <a href="4-pm.html#SP14">§14</a>, <a href="4-pm.html#SP14_1">§14.1</a><br/>Web Structure - <a href="8-ws.html#SP5_4_1_1">§5.4.1.1</a>, <a href="8-ws.html#SP7">§7</a><br/>Build Files - <a href="8-bf.html#SP9">§9</a><br/>Simple Tangler - <a href="8-st.html#SP7_2_1">§7.2.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">index</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">index</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-str.html#SP40" class="function-link"><span class="function-syntax">Streams::get_char_at_index</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">index</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="function-syntax">Str::get_first_char</span><button class="popup" onclick="togglePopup('usagePopup17')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup17">Usage of <span class="code-font"><span class="function-syntax">Str::get_first_char</span></span>:<br/><a href="4-sm.html#SP16">§16</a><br/>Filenames - <a href="3-fln.html#SP8">§8</a><br/>Version Numbers - <a href="7-vn.html#SP10">§10</a><br/>Web Structure - <a href="8-ws.html#SP7">§7</a>, <a href="8-ws.html#SP7_3_3">§7.3.3</a><br/>Simple Tangler - <a href="8-st.html#SP7_2_2">§7.2.2</a>, <a href="8-st.html#SP7_2_5">§7.2.5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="function-syntax">Str::get_last_char</span><button class="popup" onclick="togglePopup('usagePopup18')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup18">Usage of <span class="code-font"><span class="function-syntax">Str::get_last_char</span></span>:<br/>Pathnames - <a href="3-pth.html#SP8">§8</a><br/>Web Structure - <a href="8-ws.html#SP7_3_3_1">§7.3.3.1</a><br/>Simple Tangler - <a href="8-st.html#SP7_2_4">§7.2.4</a>, <a href="8-st.html#SP7_2_5_2">§7.2.5.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">L</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">-1));</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP14" class="paragraph-anchor"></a><b>§14. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::put</span><button class="popup" onclick="togglePopup('usagePopup19')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup19">Usage of <span class="code-font"><span class="function-syntax">Str::put</span></span>:<br/><a href="4-sm.html#SP15">§15</a>, <a href="4-sm.html#SP24">§24</a>, <a href="4-sm.html#SP25">§25</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP7_2">§7.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"wrote before start of string"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"wrote to null stream"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ext</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> > </span><span class="identifier-syntax">ext</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"wrote beyond end of string"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> == </span><span class="identifier-syntax">ext</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">C</span><span class="plain-syntax">) </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">, (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP40" class="function-link"><span class="function-syntax">Streams::put_char_at_index</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::put_at</span><button class="popup" onclick="togglePopup('usagePopup20')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup20">Usage of <span class="code-font"><span class="function-syntax">Str::put_at</span></span>:<br/>Text Files - <a href="4-tf.html#SP5_3">§5.3</a>, <a href="4-tf.html#SP6">§6</a><br/>Web Structure - <a href="8-ws.html#SP5_4_1_1">§5.4.1.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">index</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP14" class="function-link"><span class="function-syntax">Str::put</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">index</span><span class="plain-syntax">), </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP15" class="paragraph-anchor"></a><b>§15. Truncation. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::clear</span><button class="popup" onclick="togglePopup('usagePopup21')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup21">Usage of <span class="code-font"><span class="function-syntax">Str::clear</span></span>:<br/><a href="4-sm.html#SP16">§16</a>, <a href="4-sm.html#SP17">§17</a>, <a href="4-sm.html#SP18">§18</a>, <a href="4-sm.html#SP25">§25</a><br/>Directories - <a href="3-drc.html#SP2">§2</a><br/>Text Files - <a href="4-tf.html#SP6">§6</a><br/>Pattern Matching - <a href="4-pm.html#SP11_6">§11.6</a><br/>HTML - <a href="5-htm.html#SP27_2">§27.2</a><br/>Version Numbers - <a href="7-vn.html#SP7_1">§7.1</a><br/>Web Structure - <a href="8-ws.html#SP5_4_1">§5.4.1</a>, <a href="8-ws.html#SP5_4_1_2">§5.4.1.2</a>, <a href="8-ws.html#SP7_3_2_1">§7.3.2.1</a>, <a href="8-ws.html#SP7_3_3_2">§7.3.3.2</a>, <a href="8-ws.html#SP7_2_2_1">§7.2.2.1</a>, <a href="8-ws.html#SP7_2_2_4">§7.2.2.4</a><br/>Build Files - <a href="8-bf.html#SP8">§8</a>, <a href="8-bf.html#SP9">§9</a><br/>Simple Tangler - <a href="8-st.html#SP7_2">§7.2</a>, <a href="8-st.html#SP7_2_5_1">§7.2.5.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::truncate</span><button class="popup" onclick="togglePopup('usagePopup22')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup22">Usage of <span class="code-font"><span class="function-syntax">Str::truncate</span></span>:<br/><a href="4-sm.html#SP24">§24</a>, <a href="4-sm.html#SP25">§25</a><br/>Web Structure - <a href="8-ws.html#SP5_4_1_2">§5.4.1.2</a>, <a href="8-ws.html#SP7_3_3_1">§7.3.3.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">len</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">len</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">len</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">len</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)) </span><a href="4-sm.html#SP14" class="function-link"><span class="function-syntax">Str::put</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">len</span><span class="plain-syntax">), </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP16" class="paragraph-anchor"></a><b>§16. Indentation. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::remove_indentation</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">spaces_per_tab</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">tab_stops_of_indentation</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><a href="4-chr.html#SP2" class="function-link"><span class="function-syntax">Characters::is_space_or_tab</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_first_char</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_first_char</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">) == </span><span class="character-syntax">'\t'</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">tab_stops_of_indentation</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax"> == </span><span class="identifier-syntax">spaces_per_tab</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">tab_stops_of_indentation</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP25" class="function-link"><span class="function-syntax">Str::delete_first_character</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">respaced</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">respaced</span><span class="plain-syntax">, </span><span class="character-syntax">' '</span><span class="plain-syntax">); </span><span class="identifier-syntax">spaces_in</span><span class="plain-syntax">--; }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">respaced</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP17" class="function-link"><span class="function-syntax">Str::copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">respaced</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">respaced</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">tab_stops_of_indentation</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::rectify_indentation</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">spaces_per_tab</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">tail</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">tail</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP16" class="function-link"><span class="function-syntax">Str::remove_indentation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">tail</span><span class="plain-syntax">, </span><span class="identifier-syntax">spaces_per_tab</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="plain-syntax"><</span><span class="identifier-syntax">spaces_per_tab</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="character-syntax">' '</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">tail</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">tail</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP17" class="paragraph-anchor"></a><b>§17. Copying. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::concatenate</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP42" class="function-link"><span class="function-syntax">Streams::copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy</span><button class="popup" onclick="togglePopup('usagePopup23')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup23">Usage of <span class="code-font"><span class="function-syntax">Str::copy</span></span>:<br/><a href="4-sm.html#SP16">§16</a><br/>Command Line Arguments - <a href="3-cla.html#SP12">§12</a><br/>Pattern Matching - <a href="4-pm.html#SP14">§14</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a>, <a href="5-ee.html#SP7_1">§7.1</a><br/>Web Structure - <a href="8-ws.html#SP5_4_1_2">§5.4.1.2</a>, <a href="8-ws.html#SP7_3_2">§7.3.2</a>, <a href="8-ws.html#SP7_3_3_2">§7.3.3.2</a>, <a href="8-ws.html#SP7_2_2_3">§7.2.2.3</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP7">§7</a>, <a href="8-bdfw.html#SP7_2">§7.2</a><br/>Build Files - <a href="8-bf.html#SP8">§8</a><br/>Simple Tangler - <a href="8-st.html#SP7_2_2">§7.2.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">S2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP42" class="function-link"><span class="function-syntax">Streams::copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_tail</span><button class="popup" onclick="togglePopup('usagePopup24')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup24">Usage of <span class="code-font"><span class="function-syntax">Str::copy_tail</span></span>:<br/>Simple Tangler - <a href="8-st.html#SP7_2_4">§7.2.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">from</span><span class="plain-syntax"> < </span><span class="identifier-syntax">L</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="identifier-syntax">from</span><span class="plain-syntax">); </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><span class="identifier-syntax">L</span><span class="plain-syntax">; </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP18" class="paragraph-anchor"></a><b>§18. </b>A subtly different operation is to set a string equal to a given C string:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_ISO_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-str.html#SP28_1" class="function-link"><span class="function-syntax">Streams::write_ISO_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_UTF8_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-str.html#SP28_2" class="function-link"><span class="function-syntax">Streams::write_UTF8_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::copy_wide_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C_string</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><a href="2-str.html#SP28" class="function-link"><span class="function-syntax">Streams::write_wide_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP19" class="paragraph-anchor"></a><b>§19. Comparisons. </b>We provide both case sensitive and insensitive versions.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::eq</span><button class="popup" onclick="togglePopup('usagePopup25')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup25">Usage of <span class="code-font"><span class="function-syntax">Str::eq</span></span>:<br/>Debugging Log - <a href="2-dl.html#SP9">§9</a><br/>Dictionaries - <a href="2-dct.html#SP7_3">§7.3</a><br/>Pathnames - <a href="3-pth.html#SP3">§3</a>, <a href="3-pth.html#SP7">§7</a>, <a href="3-pth.html#SP8">§8</a><br/>Filenames - <a href="3-fln.html#SP11">§11</a><br/>Web Structure - <a href="8-ws.html#SP5_4">§5.4</a>, <a href="8-ws.html#SP5_4_1_2">§5.4.1.2</a>, <a href="8-ws.html#SP7_1">§7.1</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP20" class="function-link"><span class="function-syntax">Str::cmp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax">}</span>
|
|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::eq_insensitive</span><button class="popup" onclick="togglePopup('usagePopup26')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup26">Usage of <span class="code-font"><span class="function-syntax">Str::eq_insensitive</span></span>:<br/>Web Modules - <a href="8-wm.html#SP9">§9</a>, <a href="8-wm.html#SP9_1">§9.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) == </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">)) && (</span><a href="4-sm.html#SP20" class="function-link"><span class="function-syntax">Str::cmp_insensitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::ne</span><button class="popup" onclick="togglePopup('usagePopup27')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup27">Usage of <span class="code-font"><span class="function-syntax">Str::ne</span></span>:<br/>Version Numbers - <a href="7-vn.html#SP8">§8</a><br/>Build Files - <a href="8-bf.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP20" class="function-link"><span class="function-syntax">Str::cmp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">) != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::ne_insensitive</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) != </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">)) || (</span><a href="4-sm.html#SP20" class="function-link"><span class="function-syntax">Str::cmp_insensitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">) != </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP20" class="paragraph-anchor"></a><b>§20. </b>These two routines produce a numerical string difference suitable for
|
|
alphabetic sorting, like <span class="extract"><span class="extract-syntax">strlen</span></span> in the C standard library.
|
|
</p>
|
|
|
|
<p class="commentary">This would be a more elegant implementation:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="function-syntax">Str::start</span><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">), </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><span class="function-syntax">Str::start</span><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> < </span><span class="function-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Q</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><span class="function-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="function-syntax">Str::forward</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><span class="function-syntax">Str::forward</span><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="function-syntax">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) - (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="function-syntax">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="function-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) - </span><span class="function-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<p class="commentary">But profiling shows that the following speeds up the Inform 7 compiler by
|
|
around 1%.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::cmp</span><button class="popup" onclick="togglePopup('usagePopup28')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup28">Usage of <span class="code-font"><span class="function-syntax">Str::cmp</span></span>:<br/><a href="4-sm.html#SP19">§19</a><br/>Time - <a href="3-tm.html#SP8">§8</a><br/>Version Numbers - <a href="7-vn.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L1</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">), </span><span class="identifier-syntax">L2</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">), </span><span class="identifier-syntax">M</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">L2</span><span class="plain-syntax"> < </span><span class="identifier-syntax">M</span><span class="plain-syntax">) </span><span class="identifier-syntax">M</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L2</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">M</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">) - (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">L1</span><span class="plain-syntax"> - </span><span class="identifier-syntax">L2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::cmp_insensitive</span><button class="popup" onclick="togglePopup('usagePopup29')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup29">Usage of <span class="code-font"><span class="function-syntax">Str::cmp_insensitive</span></span>:<br/><a href="4-sm.html#SP19">§19</a><br/>Command Line Arguments - <a href="3-cla.html#SP15">§15</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::start</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">), </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::start</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="identifier-syntax">index</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Q</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = </span><span class="identifier-syntax">tolower</span><span class="plain-syntax">((</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)) - </span><span class="identifier-syntax">tolower</span><span class="plain-syntax">((</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) - </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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<p class="commentary firstcommentary"><a id="SP21" class="paragraph-anchor"></a><b>§21. </b>It's sometimes useful to see whether two strings agree on their last
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<span class="extract"><span class="extract-syntax">N</span></span> characters, or their first <span class="extract"><span class="extract-syntax">N</span></span>. For example,
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</p>
|
|
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<pre class="displayed-code all-displayed-code code-font">
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|
<span class="plain-syntax"> </span><span class="function-syntax">Str::suffix_eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"wayzgoose"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"snow goose"</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">)</span>
|
|
</pre>
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|
<p class="commentary">will return <span class="extract"><span class="extract-syntax">TRUE</span></span> for <span class="extract"><span class="extract-syntax">N</span></span> equal to 0 to 5, and <span class="extract"><span class="extract-syntax">FALSE</span></span> thereafter.
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</p>
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<p class="commentary">(The Oxford English Dictionary defines a "wayzgoose" as a holiday outing
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for the staff of a publishing house.)
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::prefix_eq</span><button class="popup" onclick="togglePopup('usagePopup30')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup30">Usage of <span class="code-font"><span class="function-syntax">Str::prefix_eq</span></span>:<br/>Pathnames - <a href="3-pth.html#SP7">§7</a><br/>Filenames - <a href="3-fln.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L1</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">), </span><span class="identifier-syntax">L2</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">N</span><span class="plain-syntax"> > </span><span class="identifier-syntax">L1</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">N</span><span class="plain-syntax"> > </span><span class="identifier-syntax">L2</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">) != </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::suffix_eq</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L1</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">), </span><span class="identifier-syntax">L2</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">N</span><span class="plain-syntax"> > </span><span class="identifier-syntax">L1</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">N</span><span class="plain-syntax"> > </span><span class="identifier-syntax">L2</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=1; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><=</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">L1</span><span class="plain-syntax">-</span><span class="identifier-syntax">i</span><span class="plain-syntax">) != </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">, </span><span class="identifier-syntax">L2</span><span class="plain-syntax">-</span><span class="identifier-syntax">i</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::begins_with_wide_string</span><button class="popup" onclick="togglePopup('usagePopup31')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup31">Usage of <span class="code-font"><span class="function-syntax">Str::begins_with_wide_string</span></span>:<br/>Command Line Arguments - <a href="3-cla.html#SP5_1">§5.1</a><br/>Simple Tangler - <a href="8-st.html#SP7_2_2">§7.2.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prefix</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">prefix</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">prefix</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">prefix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">) != </span><span class="identifier-syntax">prefix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">])</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::ends_with_wide_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">suffix</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">suffix</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">suffix</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">) - (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">wcslen</span><span class="plain-syntax">(</span><span class="identifier-syntax">suffix</span><span class="plain-syntax">); </span><span class="identifier-syntax">suffix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">+</span><span class="identifier-syntax">i</span><span class="plain-syntax">) != </span><span class="identifier-syntax">suffix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">])</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP22" class="paragraph-anchor"></a><b>§22. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::eq_wide_string</span><button class="popup" onclick="togglePopup('usagePopup32')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup32">Usage of <span class="code-font"><span class="function-syntax">Str::eq_wide_string</span></span>:<br/>Debugging Log - <a href="2-dl.html#SP9">§9</a><br/>Filenames - <a href="3-fln.html#SP9">§9</a><br/>Epub Ebooks - <a href="5-ee.html#SP5">§5</a>, <a href="5-ee.html#SP7_2_1">§7.2.1</a>, <a href="5-ee.html#SP7_3_2_1">§7.3.2.1</a><br/>Web Structure - <a href="8-ws.html#SP7_3_3_2">§7.3.3.2</a><br/>Bibliographic Data for Webs - <a href="8-bdfw.html#SP7">§7</a><br/>Simple Tangler - <a href="8-st.html#SP7_2_2">§7.2.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)?</span><span class="identifier-syntax">TRUE:FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) == (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">wcslen</span><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">S1</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) != </span><span class="identifier-syntax">S2</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++])</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::eq_narrow_string</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)?</span><span class="identifier-syntax">TRUE:FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">) == (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">strlen</span><span class="plain-syntax">(</span><span class="identifier-syntax">S2</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">S1</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) != (</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">S2</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++])</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::ne_wide_string</span><button class="popup" onclick="togglePopup('usagePopup33')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup33">Usage of <span class="code-font"><span class="function-syntax">Str::ne_wide_string</span></span>:<br/>Web Structure - <a href="8-ws.html#SP7_3_2_1">§7.3.2.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP22" class="function-link"><span class="function-syntax">Str::eq_wide_string</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S1</span><span class="plain-syntax">, </span><span class="identifier-syntax">S2</span><span class="plain-syntax">)?</span><span class="identifier-syntax">FALSE:TRUE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP23" class="paragraph-anchor"></a><b>§23. White space. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::is_whitespace</span><button class="popup" onclick="togglePopup('usagePopup34')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup34">Usage of <span class="code-font"><span class="function-syntax">Str::is_whitespace</span></span>:<br/>Command Line Arguments - <a href="3-cla.html#SP11">§11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-chr.html#SP2" class="function-link"><span class="function-syntax">Characters::is_space_or_tab</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">)) == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP24" class="paragraph-anchor"></a><b>§24. </b>This removes spaces and tabs from both ends:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::trim_white_space</span><button class="popup" onclick="togglePopup('usagePopup35')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup35">Usage of <span class="code-font"><span class="function-syntax">Str::trim_white_space</span></span>:<br/>Web Structure - <a href="8-ws.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">len</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">), </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::start</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!(</span><a href="4-chr.html#SP2" class="function-link"><span class="function-syntax">Characters::is_space_or_tab</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)))) { </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">++;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_BACKWARDS_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!(</span><a href="4-chr.html#SP2" class="function-link"><span class="function-syntax">Characters::is_space_or_tab</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Q</span><span class="plain-syntax">)))) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">++;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax">+</span><span class="identifier-syntax">j</span><span class="plain-syntax"> > </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)) </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">len</span><span class="plain-syntax"> = </span><span class="identifier-syntax">len</span><span class="plain-syntax"> - </span><span class="identifier-syntax">j</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">len</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::start</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">do</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP14" class="function-link"><span class="function-syntax">Str::put</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">c</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">); </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">len</span><span class="plain-syntax"> = </span><span class="identifier-syntax">len</span><span class="plain-syntax"> - </span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">len</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::trim_white_space_at_end</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">shortened</span><span class="plain-syntax"> = </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)-1; </span><span class="identifier-syntax">j</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</span><span class="plain-syntax">--) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-chr.html#SP2" class="function-link"><span class="function-syntax">Characters::is_space_or_tab</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">))) {</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">shortened</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">shortened</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::trim_all_white_space_at_end</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">shortened</span><span class="plain-syntax"> = </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">)-1; </span><span class="identifier-syntax">j</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</span><span class="plain-syntax">--) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-chr.html#SP3" class="function-link"><span class="function-syntax">Characters::is_babel_whitespace</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">))) {</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">shortened</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">shortened</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP25" class="paragraph-anchor"></a><b>§25. Deleting characters. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::delete_first_character</span><button class="popup" onclick="togglePopup('usagePopup36')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup36">Usage of <span class="code-font"><span class="function-syntax">Str::delete_first_character</span></span>:<br/><a href="4-sm.html#SP16">§16</a><br/>Web Structure - <a href="8-ws.html#SP7_3_3">§7.3.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP25" class="function-link"><span class="function-syntax">Str::delete_nth_character</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::delete_last_character</span><button class="popup" onclick="togglePopup('usagePopup37')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup37">Usage of <span class="code-font"><span class="function-syntax">Str::delete_last_character</span></span>:<br/>Simple Tangler - <a href="8-st.html#SP7_2_4">§7.2.4</a>, <a href="8-st.html#SP7_2_5_2">§7.2.5.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">) > </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">) - </span><span class="constant-syntax">1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::delete_nth_character</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">n</span><span class="plain-syntax">); </span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax"> < </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">); </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP14" class="function-link"><span class="function-syntax">Str::put</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP11" class="function-link"><span class="function-syntax">Str::forward</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::delete_n_characters</span><button class="popup" onclick="togglePopup('usagePopup38')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup38">Usage of <span class="code-font"><span class="function-syntax">Str::delete_n_characters</span></span>:<br/>Command Line Arguments - <a href="3-cla.html#SP5_1">§5.1</a><br/>Pathnames - <a href="3-pth.html#SP7">§7</a><br/>Filenames - <a href="3-fln.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">) - </span><span class="identifier-syntax">n</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">L</span><span class="plain-syntax"> <= </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">L</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
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<span class="plain-syntax"> </span><a href="4-sm.html#SP14" class="function-link"><span class="function-syntax">Str::put</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">), </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP10" class="function-link"><span class="function-syntax">Str::at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">+</span><span class="identifier-syntax">n</span><span class="plain-syntax">)));</span>
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|
<span class="plain-syntax"> </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::truncate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP26" class="paragraph-anchor"></a><b>§26. Substrings. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Str::substr</span><button class="popup" onclick="togglePopup('usagePopup39')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup39">Usage of <span class="code-font"><span class="function-syntax">Str::substr</span></span>:<br/>Pathnames - <a href="3-pth.html#SP8">§8</a><br/>Filenames - <a href="3-fln.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="constant-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">string_position</span><span class="plain-syntax"> </span><span class="identifier-syntax">to</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">from</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax"> != </span><span class="identifier-syntax">to</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"substr on two different strings"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">from</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="identifier-syntax">to</span><span class="plain-syntax">.</span><span class="element-syntax">index</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">.</span><span class="element-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">));</span>
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|
<span class="plain-syntax">}</span>
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|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::includes_character</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">) == </span><span class="identifier-syntax">c</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::includes_wide_string_at</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prefix</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">prefix</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">prefix</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">prefix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">+</span><span class="identifier-syntax">j</span><span class="plain-syntax">) != </span><span class="identifier-syntax">prefix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">])</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
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|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::includes_wide_string_at_insensitive</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prefix</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">prefix</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">prefix</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">prefix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-chr.html#SP1" class="function-link"><span class="function-syntax">Characters::tolower</span></a><span class="plain-syntax">(</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">+</span><span class="identifier-syntax">j</span><span class="plain-syntax">)) != </span><a href="4-chr.html#SP1" class="function-link"><span class="function-syntax">Characters::tolower</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prefix</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]))</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::includes</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">LS</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">LT</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">LS</span><span class="plain-syntax">-</span><span class="identifier-syntax">LT</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">failed</span><span class="plain-syntax"> = </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="plain-syntax"><</span><span class="identifier-syntax">LT</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">+</span><span class="identifier-syntax">j</span><span class="plain-syntax">) != </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">j</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">failed</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">failed</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Str::includes_at</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pattern</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pattern</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> + </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pattern</span><span class="plain-syntax">) > </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">pattern</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">) != </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">++))</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP27" class="paragraph-anchor"></a><b>§27. Shim for literal storage. </b>This is where all of those I-literals created by Inweb are stored at run-time.
|
|
Note that every instance of, say, <span class="extract"><span class="extract-syntax">I"fish"</span></span> would return the same string,
|
|
that is, the same <span class="extract"><span class="extract-syntax">text_stream *</span></span> value. To prevent nasty accidents, this
|
|
is marked so that the stream value, "fish", cannot be modified at run-time.
|
|
</p>
|
|
|
|
<p class="commentary">The dictionary look-up here would not be thread-safe, so it's protected by
|
|
a mutex. There's no real performance concern because the following routine
|
|
is run just once per I-literal in the source code, when the program starts up.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">string_literals_dictionary</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Str::literal</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">wide_C_string</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">answer</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">CREATE_MUTEX</span><span class="plain-syntax">(</span><span class="identifier-syntax">mutex</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOCK_MUTEX</span><span class="plain-syntax">(</span><span class="identifier-syntax">mutex</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-sm.html#SP27_1" class="named-paragraph-link"><span class="named-paragraph">Look in dictionary of string literals</span><span class="named-paragraph-number">27.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">UNLOCK_MUTEX</span><span class="plain-syntax">(</span><span class="identifier-syntax">mutex</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">answer</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP27_1" class="paragraph-anchor"></a><b>§27.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Look in dictionary of string literals</span><span class="named-paragraph-number">27.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">string_literals_dictionary</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">string_literals_dictionary</span><span class="plain-syntax"> = </span><a href="2-dct.html#SP2" class="function-link"><span class="function-syntax">Dictionaries::new</span></a><span class="plain-syntax">(100, </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">answer</span><span class="plain-syntax"> = </span><a href="2-dct.html#SP10" class="function-link"><span class="function-syntax">Dictionaries::get_text_literal</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">string_literals_dictionary</span><span class="plain-syntax">, </span><span class="identifier-syntax">wide_C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">answer</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-dct.html#SP6" class="function-link"><span class="function-syntax">Dictionaries::create_literal</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">string_literals_dictionary</span><span class="plain-syntax">, </span><span class="identifier-syntax">wide_C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">answer</span><span class="plain-syntax"> = </span><a href="2-dct.html#SP10" class="function-link"><span class="function-syntax">Dictionaries::get_text_literal</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">string_literals_dictionary</span><span class="plain-syntax">, </span><span class="identifier-syntax">wide_C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">answer</span><span class="plain-syntax">, </span><span class="string-syntax">"%w"</span><span class="plain-syntax">, </span><span class="identifier-syntax">wide_C_string</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-str.html#SP20" class="function-link"><span class="function-syntax">Streams::mark_as_read_only</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">answer</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="4-sm.html#SP27">§27</a>.</li></ul>
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