[antlr-interest] Java.g4 bug? Attrib refs in lexer action

[Terence Parr]

I believe I updated the example to work with 4.0b2.  There is no $foo in the lexer actions anymore. setType(), setChannel etc…
Ter
On Oct 3, 2012, at 5:02 PM, Graham Wideman wrote:

> Hi Ter and all:
> 
> I'm working through the examples in the ANTLR 4 book, and have hit a problem using the Java.g4 grammar in example 3.3 ExtractInterfaceTool.
> 
> Attempting to generate parser code...
> $ antlr4 Java.g4
> 
> ... results in ...
> error(128): Java.g4:670:37: attribute references not allowed in lexer actions: $type
> error(128): Java.g4:674:41: attribute references not allowed in lexer actions: $type
> 
> In Java.g4 there are rules:
> 
> ENUM:   'enum' {if (!enumIsKeyword) $type=Identifier;}
>    ;
> 
> ASSERT
>    :   'assert' {if (!assertIsKeyword) $type=Identifier;}
> 
> ... which reference $type.
> 
> Is there some option that needs to be used for this to work? 
> 
> I note that only a few days ago there was discussion thread "Bug in antlr4" discussing the skip vs channel(HIDDEN) issue, but no mention that other users were hitting the problem I report here.
> 
> Windows 7
> Java 1.7.0_04
> ANTLR version: antlr-4.0b2-complete.jar
> Java.g4 version dated 2012-09-18, downloaded with example code tpantlr2-code.zip 2012-10-01 16:53
> 
> Thanks,
> 
> -- Graham
> 
> 
> 
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