[antlr-interest] Composite tree grammar

[Bill Andersen]

Gavin,

Yeah, I goofed the line numbers up.  Here are the files again.  My  
question is whether the syntax is correct.  I can't see anything  
wrong.  Thanks for any help.

grammar Foo;

options {
	output=AST;
}

tokens {
	FOO = 'foo';
	BAR = 'bar';
	ZAP;
}

start
	: FOO BAR EOF
		-> ^(ZAP FOO BAR)
	;
	
----------------------
tree grammar FooAST;

options {
	ASTLabelType=CommonTree;
	tokenVocab=Foo;
	output=AST;
}

start
	: ^(ZAP FOO BAR)
		-> ^(ZAP BAR FOO)
	;
----------------------
tree grammar Import;
import FooAST;

  options {
	ASTLabelType=CommonTree;
	tokenVocab=Foo;
	output=AST;
}

start
	: ^(ZAP FOO BAR)
		-> ^(ZAP FOO BAR)
	;


On Oct 9, 2008, at 02:41 , Gavin Lambert wrote:

> At 06:02 8/10/2008, Bill Andersen wrote:
> >I want to use grammar import on tree grammars and did the test
> >below using ANTLRWorks 1.2.  I wrote a simple grammar (Foo) to
> >output an AST, a tree grammar (FooAST) to parse the latter,
> >and another (FooASTImport) that imports FooAST and attempts to
> >override the one rule in FooAST.  Code here.  I get a syntax
> >error (in attached snapshot) but can't see where I'm going
> >wrong.  Any help appreciated.
> [...]
> >tree grammar FooAST;
> >options {
> >	tokenVocab=Foo;
> >	output=AST;
> >}
> >start
> >	: ^(ZAP FOO BAR)
> >		-> ^(ZAP BAR FOO)
> >	;
>
> Given that the attached screenshot reports an error on line 10 of  
> FooAST.g, and there doesn't appear to be that many lines in the  
> file, I suspect some kind of EOL problem.
>
> Especially since you're on MacOS.  Maybe the file is being saved  
> with Mac CR-only line endings (or some other strange construction),  
> while ANTLR requires either LF-only or CRLF.
>

Bill Andersen
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