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35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
// Build with "--input custom" re2c switch.
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//
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// This is an example of handling fixed-length buffer with "--input custom":
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// on each YYPEEK we check for the end of input, thus YYFILL generation
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// can be safely suppressed.
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//
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// Note that YYLIMIT points not to terminating NULL, but to the previous
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// character: we emulate the case when input has no terminating NULL.
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//
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// For a real-life example see https://github.com/sopyer/mjson
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// or mjson.re from re2c test collection.
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bool lex (const char * cursor, const char * const limit)
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{
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const char * marker;
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const char * ctxmarker;
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# define YYCTYPE char
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# define YYPEEK() (cursor >= limit ? 0 : *cursor)
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# define YYSKIP() ++cursor
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# define YYBACKUP() marker = cursor
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# define YYBACKUPCTX() ctxmarker = cursor
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# define YYRESTORE() cursor = marker
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# define YYRESTORECTX() cursor = ctxmarker
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/*!re2c
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re2c:yyfill:enable = 0;
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"int buffer " / "[" [0-9]+ "]" { return true; }
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* { return false; }
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*/
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}
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int main ()
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{
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char buffer [] = "int buffer [1024]";
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return !lex (buffer, buffer + sizeof (buffer) - 1);
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}
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