46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/* This file is part of the Project Athena Zephyr Notification System.
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* It is one of the source files comprising zwgc, the Zephyr WindowGram
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* client.
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*
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* Created by: Marc Horowitz <marc@athena.mit.edu>
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*
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* $Id$
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*
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* Copyright (c) 1989 by the Massachusetts Institute of Technology.
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* For copying and distribution information, see the file
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* "mit-copyright.h".
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*/
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#include <zephyr/mit-copyright.h>
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#ifndef substitute_MODULE
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#define substitute_MODULE
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#include "new_string.h"
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/*
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* string substitute(string (*lookup)(string); string text)
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* Effects: returns the result of expanding all variable
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* references in text using lookup. Example:
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* "test $foo.$bar baz" would be translated to
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* "text <foo>.<bar> baz" where "<foo>" is the value of
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* lookup("foo") and "<bar>" is the value of lookup("bar").
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* Variables are case sensitive and have the form
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* {identifier_char}+ where identifier_char is defined
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* in lexer.h by is_identifier_char. $(foo) and
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* ${foo} are alternate forms for $foo. In particular,
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* ${foo}bar is a reference to foo followed by "bar" while
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* $foobar is a reference to foobar. Incomplete variable
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* references like $(foo bar are displayed as if they
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* were not variable references. To allow quoting, "$$"
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* is translated to "$". Only the first
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* MAX_IDENTIFIER_LENGTH characters of an identifier are
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* significant. The strings returned by lookup are not
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* modified in any way or freed.
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*/
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extern string substitute(string (*)(string), string);
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#endif
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