[antlr-interest] Complex AST transformaton

[Oliver Zeigermann]

How can I import tree token types into a lexer? Importing a tree
grammar into a lexer grammar is no allowd.

Oliver

2008/12/14 Loring Craymer <lgcraymer at yahoo.com>:
> What Ter meant was to import the AST2 token types into the lexer (and, indirectly, into the parser).  Basically, reserve the AST2 types before the parser token types are determined.
>
> --Loring
>
>
>
> ----- Original Message ----
>> From: Oliver Zeigermann <oliver.zeigermann at gmail.com>
>> To: Terence Parr <parrt at cs.usfca.edu>
>> Cc: antlr-interest Interest <antlr-interest at antlr.org>
>> Sent: Saturday, December 13, 2008 3:07:05 AM
>> Subject: Re: [antlr-interest] Complex AST transformaton
>>
>> Oh, I did not know about grammar import. Nice.
>>
>> Thanks for the help!
>>
>> I have not properly described my problem, though. I have the following
>> processing chain:
>>
>> Input --Lexer--> Token Stream
>>
>> --Parser--> AST0
>>
>> --Tree Transformer--> AST1 (still having the token types of defined in
>> the parser)
>>
>> --Tree Translator--> AST2 (having a completely new set of token types)
>>
>> --Tree Template Emitter--> Final Output
>>
>> As the token types used in AST1 are defined in the parser, how could I
>> use grammar import from AST2? I guess that does not work, right? There
>> will be a clash of token types anyway?!
>>
>> Oliver
>>
>> 2008/12/12 Terence Parr :
>> > Try a grammar import (from where the new tokens come from).  that hsould
>> > give a union of AST1/AST2 token types.
>> > Ter
>> > On Dec 12, 2008, at 4:36 AM, Oliver Zeigermann wrote:
>> >
>> >> Folks!
>> >>
>> >> I am struggeling to how to make a complex AST1 -> AST2 transformation
>> >> where the token types of AST1 are completely different from those in
>> >> AST2. How do I specify "tokenVocab" in this case? Do I have to create
>> >> a token file manually?
>> >>
>> >> Any hints welcome :)
>> >>
>> >> Oliver
>> >>
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>> >
>> >
>>
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