[antlr-interest] Token Streams, multiple lexers - how does lexer access selector?

[Ric Klaren]

On Wed, Dec 18, 2002 at 11:52:53PM -0500, David Penton wrote:
> My question is: how does the lexer java class generated by antlr know
> about selector, which is an antlr.TokenStreamSelector?  I mean, other
> than editing the generated lexer class source files manually.  I don't
> see anything that is intended to do this automatically, nor do I see a
> way to embed code in the generated parser or lexer files. Thus the
> reference the method call "selector.push(...)" prevents my lexer class
> from compiling unless I edit it manually to have a selector instance
> variable and an accessor method to set it.

See the multiLexer example, that lists one way. If you want to add code to
the generated classes, make them look like this:

header {
// into the generated header file..
}

{
// for c++ mode this goes into the generated cpp file. For java I don't
// know of hand.
}
class DemoJavaLexer extends Lexer;
options {
        k=2;
        importVocab = Common;
        exportVocab = Java;
}
tokens {
        INT="int";
}
{
// this gets inserted into the class.. so here you can add custom 
// constructors, methods, attributes. etc.
}

START: .... ;

This is also hidden somewhere in the docs...

HTH,

Ric
--
-----+++++*****************************************************+++++++++-------
    ---- Ric Klaren ----- klaren at cs.utwente.nl ----- +31 53 4893722  ----
-----+++++*****************************************************+++++++++-------
  "You know how to use that thing?" [pointing to the sword]
  "Sure.. The pointy end goes into the other guy."
  --- The Mask of Zorro


 

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