[antlr-interest] How to specify lexer options without composite grammars

[Gavin Lambert]

At 07:16 17/06/2008, Achim Westermann wrote:
 >I need to specify the lexer option filter.
 >Within one file it seems impossible to start:
 >
 >...
 >lexer grammar myname; -> unexpected token "lexer"
 >
 >I tried this in order to start an options block for the lexer.

You can't "restart" a grammar midway through the file.  Each 
grammar file can only contain one grammar.

 >The wiki example for filter lexers shows only a single lexer
 >grammar. So the next try was to use a composite grammar ant
 >import the lexer grammar from the parser grammar.

You can't combine composite grammars and filter lexers at all.  If 
you want to use a filter lexer, then you will have to create one 
"lexer grammar" (in its own file) and one "parser grammar" (in its 
own file), and link them via the vocabulary options.