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- /*
- Lexical analyser
- for `flex`
- */
- %{
- #include "eval.tab.h" // From bison
- %}
- %option noinput
- %option nounput
- %option noyywrap
- VOID [ \n\t]
- %%
- [0-9]+ yylval = atoi(yytext); return number; // Number token
- [-*+()=/] return yytext[0]; // Operators
- {VOID}+ ; // Skip white characters
- . fprintf(stderr, "Input '%c' unknown\n", yytext[0]); // Fallback error
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