[antlr-interest] CSharp3 Composite error

[Andrey Sirotkin]

Hello!

I created three simple grammar files:

G1_Lexer.g:

lexer grammar G1_Lexer;
options {
    language=CSharp3;
}
INT :	'0'..'9'+;

G1_Parser.g:

parser grammar G1_Parser;
options {
    language=CSharp3;
    tokenVocab = G1_Lexer;
}
rule1: INT;

G2.g

grammar G2;
options {
    language=CSharp3;
    output=AST;
}
import G1_Parser;
prog 	:rule1*;

Then generate the C# code. The constructor of G2Parser is:

	public G2Parser(ITokenStream input, RecognizerSharedState state)
		: base(input, state)
	{
		ITreeAdaptor treeAdaptor = null;
		CreateTreeAdaptor(ref treeAdaptor);
		TreeAdaptor = treeAdaptor ?? new CommonTreeAdaptor(); //throws NullReference exception
		gG1_Parser = new G2_G1_Parser(input, state, this);

		OnCreated();
	}

As you can see the gG1_Parser is initialized after setting of TreeAdaptor; but TreeAdaptor setter uses this field:

	public ITreeAdaptor TreeAdaptor
	{
..........
		set
		{
			this.adaptor = value;
			gG1_Parser.TreeAdaptor = this.adaptor;
		}
	}


I changed the '..\org\antlr\codegen\templates\CSharp3\CSharp3.stg' file like this:

public <grammar.recognizerName>(<inputStreamType> input, RecognizerSharedState state<grammar.delegators:{g|, <g.recognizerName> <g:delegateName()>}>)
	: base(input, state)
{
	<grammar.directDelegates:
	 {g|<g:delegateName()> = new <g.recognizerName>(input, state<trunc(g.delegators):{p|, <p:delegateName()>}>, this);}; separator="\n">
	<parserCtorBody()>
	<grammar.indirectDelegates:{g | <g:delegateName()> = <g.delegator:delegateName()>.<g:delegateName()>;}; separator="\n">
	<last(grammar.delegators):{g|gParent = <g:delegateName()>;}>

	OnCreated();
}

Move the <parserCtorBody()> after <grammar.directDelegates and now it works correctly.

Kind regards,
Andrey Sirotkin