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

[David Penton]

Thanks Ric.  That is what I was looking for.  Eventually I shall get
familiar with the documentation.  I find it a little hard to find things
in it so far, but antlr is so useful that I intend to stick with it.

- Dave -

On Thu, 2002-12-19 at 05:05, Ric Klaren wrote:
> 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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