Way cool! Just curious...is the modal state variable automatically accessible
to the parser? Perhaps on a subchannel synced with the token stream? Sorry to
be tuning in late...always interested in new paths to semiosis. :)
Anyway...I need to take a look at girhub and think up a fun use.
Kyle
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Terence Parr <pa...@cs.usfca.edu>
Date: Wed, 26 May 2010 16:18:28
To: antlr-interest@antlr.org interest<antlr-interest@antlr.org>
Subject: [antlr-interest] ANTLR v4 progress
Just passing along an example HTML subset lexer/parser using ANTLR v4; thanks
to debugging and moral support from Oliver Zeigermann, we got the code
generation and runtime support working sufficiently to use the following
grammars. generate some really nice code indeed. You will note that, except
for the enhancement of the lexer modes, the grammars are backward compatible
with v3 :)
I still have a long way to go, but it's looking more & more useful (only does
LL(1) code generation at this point).
Ter
---------------------------
lexer grammar HTMLLexer;
TAG_START : '<' {pushMode(INSIDE);} ;
COMMENT : '<!--' .* '-->' {skip();} ;
TEXT : ~'<'+ ;
mode INSIDE;
TAG_STOP : '>' {popMode();} ;
END_TAG : '/' ID '>' {popMode();} ;
ID : ('A'..'Z'|'a'..'z'|'0'..'9'|'_'|'#')+ ;
EQ : '=' ;
STRING : '"' .* '"'
;
WS : ' '+ {skip();} ;
------------------------
parser grammar HTMLParser;
options { tokenVocab=HTMLLexer; }
file : ( TAG_START (starttag | endtag) | TEXT)+ EOF ;
starttag : ID attr* TAG_STOP ;
attr : ID (EQ (ID|STRING))? ;
endtag
: END_TAG
;
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