80 lines
1.8 KiB
Text
80 lines
1.8 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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#ifdef DOESNT_HAVE_STRDUP
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#warning DOESNT_HAVE_STRDUP
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char *strdup(const char *s);
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#endif
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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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/*general definitions*/
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CHAR [a-zA-Z]
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NUM [0-9]
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/*operands*/
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SHELL [$]
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ROOT [/]
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PARENT ".."
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CHDIR "cd"
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LIST "ls"
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DIR "dir"
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%%
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{NL} { return NEWLINE; }
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{SPACE} { return SPACE; }
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{SHELL}{SPACE} { return PROMPT; }
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{CHDIR} { return CHDIR; }
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{LIST} { return LIST; }
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{ROOT} { return ROOT; }
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{PARENT} { return PARENT; }
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{DIR} { return DIRECTORY; }
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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 SIZE;
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}
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{CHAR}+ |
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{CHAR}+"."{CHAR}+ {
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yylval->path = strdup(yytext);
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// yylval->path = calloc(strlen(yytext) + 1, sizeof(char));
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// strcpy(yylval->path, yytext);
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return PATHSPEC;
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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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