Question

The Definitive ANTLR Guide starts with a simple recognizer. Using grammar verbatim to target C-runtime fails because %s means something to ANTLR:

$ cat T.g
    grammar T;

options {
    language = C;
    }

@parser::includes
{
    #include <stdio.h>
}

/** Match things like "call foo;" */
r :  call  ID  ;  {printf("invoke %s
", $ID.text);} ;

ID:  a .. z + ;

WS: (   | 
 | 
 )+   {$channel=HIDDEN;} ; // ignore whitespace

$ java org.antlr.Tool T.g
error(146): T.g:13:19: invalid StringTemplate % shorthand syntax:  %s .

How to tell ANTLR to ignore % in this case?

Answer 1

Try escaping your %:

r :  call  ID  ;  {printf("invoke \%s
", $ID.text);} ;

友情链接