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(General Escape Syntax): Update explanation of unicode escape syntax.

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Chong Yidong 2009-02-27 01:44:02 +00:00
parent d55f6ca59b
commit fb080b287c
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doc/lispref/objects.texi
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@ -346,18 +346,19 @@ following text.)
@subsubsection General Escape Syntax
In addition to the specific escape sequences for special important
control characters, Emacs provides general categories of escape syntax
that you can use to specify non-ASCII text characters.
control characters, Emacs provides several types of escape syntax that
you can use to specify non-ASCII text characters.
@cindex unicode character escape
For instance, you can specify characters by their Unicode values.
You can specify characters by their Unicode values.
@code{?\u@var{nnnn}} represents a character that maps to the Unicode
code point @samp{U+@var{nnnn}}. There is a slightly different syntax
for specifying characters with code points above @code{#xFFFF};
@code{\U00@var{nnnnnn}} represents the character whose Unicode code
point is @samp{U+@var{nnnnnn}}, if such a character is supported by
Emacs. If the corresponding character is not supported, Emacs signals
an error.
code point @samp{U+@var{nnnn}} (by convention, Unicode code points are
given in hexadecimal). There is a slightly different syntax for
specifying characters with code points higher than
@code{U+@var{ffff}}: @code{\U00@var{nnnnnn}} represents the character
whose code point is @samp{U+@var{nnnnnn}}. The Unicode standard only
defines code points up to @samp{U+@var{10ffff}}, so if you specify a
code point higher than that, Emacs signals an error.
This peculiar and inconvenient syntax was adopted for compatibility
with other programming languages. Unlike some other languages, Emacs