1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/* This is test.g which tests a simple DLG-based scanner using string input */
<<
typedef ANTLRCommonToken ANTLRToken;
#include "DLGLexer.h"
#include "PBlackBox.h"
int main(int argc, char **argv)
{
if ( argc==1 ) {fprintf(stderr, "how about an argument?\n"); exit(1);}
DLGStringInput in(argv[1]); /* create an input stream for DLG */
DLGLexer scan(&in); /* create scanner reading from stdin */
ANTLRTokenBuffer pipe(&scan); /* make pipe between lexer & parser */
ANTLRTokenPtr aToken = new ANTLRToken;
scan.setToken(mytoken(aToken));
Expr parser(&pipe); /* create parser of type Expr hooked to scanner */
parser.init(); /* init the parser; prime lookahead etc... */
parser.e(); /* start parsing at rule 'e' of that parser */
return 0;
}
>>
#token "[\ \t\n]+" <<skip();>>
#token Eof "@"
#tokclass My { IDENTIFIER NUMBER }
class Expr { /* Define a grammar class */
e : My My Eof
<<fprintf(stderr, "text is %s,%s\n", $1->getText(), $2->getText());>>
;
}
#token IDENTIFIER "[a-z]+"
#token NUMBER "[0-9]+"
|
