[antlr-interest] Problems with lexer/grammar rules

Sun Aug 19 02:21:27 PDT 2007

Hi everyone, I\'ve tried this simple grammar:

grammar Imdb;
@header {
package grammatiche;
}
@lexer::header {
package grammatiche;
}
document: (WS)* \'<html>\' (WS)* head (WS|COMMENT)* BODY (WS)* \'</html>\'
(WS)*;
head : \'<head>\' (WS|title|META|LINK)+ \'</head>\';
title:\'<title>\' STRING \'</title>\';
META:\'<meta\' (options {greedy=false;} : .)* \'>\';
LINK: \'<link\'(options {greedy=false;} : .)* \'>\';
BODY: \'<body\' (options {greedy=false;} : .)*\'</body>\';
STRING:(\'0\'..\'9\'|\'a\'..\'z\'|\'A\'..\'Z\'|\' \'| \'\\\'\'
|\'#\'|\'.\'|\':\'|\';\'|\'&\'|\',\'|\'-\'|\'!\'|\'(\'|\')\')+;
WS : \' \' | \'\\r\' | \'\\n\' ;

on the html page http://www.imdb.com/find?s=all&q=taxi+driver (see source
with the browser),it doesn\'t work and gives this error message:

line 7:0 mismatched input \' \' expecting \'</head>\'
line 8:0 mismatched input \' \' expecting BODY

while the same grammar with all lexer rules:

grammar Imdb;
@header {
package grammatiche;
}
@lexer::header {
package grammatiche;
}
document: (WS)* \'<html>\' (WS)* HEAD (WS|COMMENT)* BODY (WS)* \'</html>\'
(WS)*;
HEAD : \'<head>\' (WS|TITLE|META|LINK)+ \'</head>\';
TITLE:\'<title>\' STRING \'</title>\';
META:\'<meta\' (options {greedy=false;} : .)* \'>\';
LINK: \'<link\'(options {greedy=false;} : .)* \'>\';
BODY: \'<body\' (options {greedy=false;} : .)*\'</body>\';
COMMENT:   \'<!--\' (options {greedy=false;} : .)* \'-->\';
STRING:(\'0\'..\'9\'|\'a\'..\'z\'|\'A\'..\'Z\'|\' \'| \'\\\'\'
|\'#\'|\'.\'|\':\'|\';\'|\'&\'|\',\'|\'-\'|\'!\'|\'(\'|\')\')+;
WS : \' \' | \'\\r\' | \'\\n\';

works fine; I want to make \'head\' and \'title\' parser rules because I
need an action to store \'STRING\' value (the title of the HTML page) in a
parser local variable and then return it to \'document\' caller. How i
should proceed?

Thanks for help. 
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