[antlr-interest] (no subject)

[John Stovin]

Hi,

I'm a bit of an ANTLR newbie, and I'm trying to put together a parser for my
Domain Specific Language. 

I'm not sure if this is a bug in ANTLR 3b4. I'm using language=CSharp.

Here's a snippet of my grammar file:

	scope_block [SymbolTable s] :
		id = IDENTIFIER block[s, $id.Text] |
		block[s, ""]
		;
	
	block [SymbolTable s, string name] :
		'{' { s.PushScope(name); } 
		element[s]* 
		'}' { s.PopScope(); } 
		;

A scope block is series of elements surrounded by curly braces. It can
optionally be preceded by an identifier. I want the parser to call
PushScope() with a name argument on the SymbolTable object when it finds an
open brace, and PopScope() when it finds a closing brace.

However, the C# code emitted looks like this. It does the right thing for
the empty string case, but it mangles the reference to $id.Text. Any
suggestions about what I might be doing wrong here, or any workarounds.
	

            switch (alt2) 
            {
                case 1 :
                    // DVD_DSL.g:22:2: id= IDENTIFIER block[s, $id.Text]
                    {
                    	root_0 = (object)adaptor.GetNilNode();
                    
                    	id = (Token)input.LT(1);
 
Match(input,IDENTIFIER,FOLLOW_IDENTIFIER_in_scope_block87); 
                    	id_tree = (object)adaptor.Create(id);
                    	adaptor.AddChild(root_0, id_tree);

                    	PushFollow(FOLLOW_block_in_scope_block89);
----------------------->block3 = block(s,  , id, .Text);
                    	followingStackPointer_--;
                    	
                    	adaptor.AddChild(root_0, block3.Tree);
                    
                    }
                    break;
                case 2 :
                    // DVD_DSL.g:23:2: block[s, \"\"]
                    {
                    	root_0 = (object)adaptor.GetNilNode();
                    
                    	PushFollow(FOLLOW_block_in_scope_block95);
----------------------->block4 = block(s,  "");
                    	followingStackPointer_--;
                    	
                    	adaptor.AddChild(root_0, block4.Tree);
                    
                    }
                    break;
            
            }

Thanks in advance.

______________________
John Stovin
Senior Software Engineer

mailto:j.stovin at zoo-tech.com   http://www.zoo-tech.com
t: +44 (0)114 274 3660                  f: +44 (0)114 274 3699	

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