1: %{
2: /* front-end scanner for vmgen example
3:
4: Copyright (C) 2001,2003,2007 Free Software Foundation, Inc.
5:
6: This file is part of Gforth.
7:
8: Gforth is free software; you can redistribute it and/or
9: modify it under the terms of the GNU General Public License
10: as published by the Free Software Foundation, either version 3
11: of the License, or (at your option) any later version.
12:
13: This program is distributed in the hope that it will be useful,
14: but WITHOUT ANY WARRANTY; without even the implied warranty of
15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: GNU General Public License for more details.
17:
18: You should have received a copy of the GNU General Public License
19: along with this program; if not, see http://www.gnu.org/licenses/.
20: */
21:
22: /* % option yylineno (flex option, implied by flex -l) */
23:
24: #include <stdlib.h>
25: #include <string.h>
26: char *mystrdup(const char *s)
27: {
28: char *t=malloc(strlen(s)+1);
29: return strcpy(t,s);
30: }
31: %}
32:
33: %%
34: [-();,+*&|<=!] return yytext[0];
35: := return BECOMES;
36: func return FUNC;
37: return return RETURN;
38: end return END;
39: var return VAR;
40: if return IF;
41: then return THEN;
42: else return ELSE;
43: while return WHILE;
44: do return DO;
45: print return PRINT;
46: [0-9]+ { yylval.num=strtol(yytext,NULL,10); return NUM; }
47: [a-zA-Z\_][a-zA-Z0-9\_]* { yylval.string=mystrdup(yytext); return IDENT; }
48: [ \t\n] ;
49: [/][/].* ;
50: . yyerror("illegal character"); exit(1);
51: %%
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