44 lines
1.5 KiB
Text
44 lines
1.5 KiB
Text
[Macros::] Paragraph Macros.
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To manage the set of named paragraph macros in a section.
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@ We store these like so:
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<<*>>=
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typedef struct para_macro {
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struct text_stream *macro_name; /* usually long, like "Create a paragraph macro here" */
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struct paragraph *defining_paragraph; /* as printed in small type after the name in any usage */
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struct source_line *defn_start; /* it ends at the end of its defining paragraph */
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struct linked_list *macro_usages; /* of [[macro_usage]]: only computed for weaves */
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CLASS_DEFINITION
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} para_macro;
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@ Each section has its own linked list of paragraph macros, since the scope for
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the usage of these is always a single section.
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<<*>>=
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para_macro *Macros::create(section *S, paragraph *P, source_line *L, text_stream *name) {
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para_macro *pmac = CREATE(para_macro);
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pmac->macro_name = Str::duplicate(name);
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pmac->defining_paragraph = P;
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P->defines_macro = pmac;
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pmac->defn_start = L->next_line;
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pmac->macro_usages = NEW_LINKED_LIST(macro_usage);
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ADD_TO_LINKED_LIST(pmac, para_macro, S->macros);
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return pmac;
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}
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@ \section{Paragraph macro search.}
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The scope for looking up paragraph macro names is a single section, not the
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entire web. So you can't expand a macro from another section, but then again,
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you can use the same macro name twice in different sections; and lookup is
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much faster.
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<<*>>=
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para_macro *Macros::find_by_name(text_stream *name, section *scope) {
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para_macro *pmac;
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LOOP_OVER_LINKED_LIST(pmac, para_macro, scope->macros)
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if (Str::eq(name, pmac->macro_name))
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return pmac;
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return NULL;
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}
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