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https://github.com/FirebirdSQL/firebird.git
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33 lines
504 B
Plaintext
33 lines
504 B
Plaintext
%{
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/* first section */
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%}
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%%
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%{
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/* second section */
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%}
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S : /* empty */ { printf("S -> epsilon\n"); }
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| '(' S ')' S { printf("S -> ( S ) S\n"); }
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%ifdef ABC
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/* see how preprocessor can be used */
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| '*' { printf("S -> *\n"); }
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%endif
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;
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%%
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#include <stdio.h>
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main() {
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printf("yyparse() = %d\n",yyparse());
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}
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yylex() {
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int ch;
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do { ch = getchar(); } while (ch == ' ' || ch == '\n' || ch == '\t');
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if (ch == EOF) return 0;
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return ch;
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}
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yyerror(s) char*s; {
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printf("%s\n",s);
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}
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