[antlr-interest] Better support for tracing

[Monty Zukowski]

Pardon me if this has been discussed before.  Debugging my tree parser 
I decided to override match() to help me see what is going on inside of 
the rule.  (See below for C++ code)

I think it would be handy to have a #define TRACE_TREE_PARSER generated 
into my SqlTreeParser.hpp so I can avoid forgetting to remove the code 
before delivery.

For Java we might have a final constant defined so we could gate print 
statements.

Comments?

void SqlTreeParser::match(ANTLR_USE_NAMESPACE(antlr)RefAST t, int ttype)
{
	traceIndent();
	
	if (!t || t==ASTNULL || t->getType()!=ttype)
	{
		ANTLR_USE_NAMESPACE(std)cout << "mismatch(" << t->getType() << ", "<< 
ttype <<")"<< ANTLR_USE_NAMESPACE(std)endl;
		throw ANTLR_USE_NAMESPACE(antlr)MismatchedTokenException();
	}		
	ANTLR_USE_NAMESPACE(std)cout << "match(" << ttype <<")"<< 
ANTLR_USE_NAMESPACE(std)endl;
}

Monty
ANTLR consulting
www.codetransform.com



 
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