57 lines
1.3 KiB
Text
57 lines
1.3 KiB
Text
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "parser.h"
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%}
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%option warn nodefault
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/* makes the scanner terminate after reaching <<EOF>> instead of assuming a new input was provided */
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%option noyywrap
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/* disable some unused functionality, add scanner tracking */
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%option nounput noinput batch debug
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/* gimme a reentrant parser (overkill but more pure) */
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%option reentrant
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%option bison-bridge
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NL [\n]
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SPACE " "
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DOWN "D"
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UP "U"
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LEFT "L"
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RIGHT "R"
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/*general definitions*/
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NUM [0-9]
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%%
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{NL} { return NEWLINE; }
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{SPACE} { /* return SPACE; */ }
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{DOWN} { return DOWN; }
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{UP} { return UP; }
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{LEFT} { return LEFT; }
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{RIGHT} { return RIGHT; }
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{NUM}+ {
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unsigned long num = strtoul(yytext, NULL, 10);
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yylval->num = num;
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return NUM;
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}
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<<EOF>> {
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return END_OF_FILE;
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}
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. {
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printf("[error] Encountered unexpected token %s\n", yytext);
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return 0;
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}
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%%
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