1: /* front-end scanner for vmgen example
2:
3: Copyright (C) 2001 Free Software Foundation, Inc.
4:
5: This file is part of Gforth.
6:
7: Gforth is free software; you can redistribute it and/or
8: modify it under the terms of the GNU General Public License
9: as published by the Free Software Foundation; either version 2
10: of the License, or (at your option) any later version.
11:
12: This program is distributed in the hope that it will be useful,
13: but WITHOUT ANY WARRANTY; without even the implied warranty of
14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: GNU General Public License for more details.
16:
17: You should have received a copy of the GNU General Public License
18: along with this program; if not, write to the Free Software
19: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20: */
21:
22: /* %option yylineno (flex option, implied by flex -l) */
23:
24: %{
25: #include <stdlib.h>
26: #include <string.h>
27: char *mystrdup(const char *s)
28: {
29: char *t=malloc(strlen(s)+1);
30: return strcpy(t,s);
31: }
32: %}
33:
34: %%
35: [-();,+*&|<=!] return yytext[0];
36: := return BECOMES;
37: func return FUNC;
38: return return RETURN;
39: end return END;
40: var return VAR;
41: if return IF;
42: then return THEN;
43: else return ELSE;
44: while return WHILE;
45: do return DO;
46: print return PRINT;
47: [0-9]+ { yylval.num=strtol(yytext,NULL,10); return NUM; }
48: [a-zA-Z\_][a-zA-Z0-9\_]* { yylval.string=mystrdup(yytext); return IDENT; }
49: [ \t\n] ;
50: [/][/].* ;
51: . yyerror("illegal character"); exit(1);
52: %%
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