[antlr-interest] ANTLR Examples - StdCParser for C]

[Ric Klaren]

Hi,

(It seems this didn't make it to the list in my first attempt)

On Wed, Oct 03, 2001 at 09:09:02PM +0100, David Wigg wrote:
> We are trying to convert the example StdCParser.g to produce C++ code
> instead of Java code.

Are you also thinking of releasing this to the community ? (as an aside
note?)

> At the moment we cannot compile our new CToken.cpp because we are left with
> one compiler error on the return statement from the toString() method which
> states that it cannot add two addresses together [return "CToken:" + "(" +
> etc.]. This would appear to be due to the compiler not being able to access
> the definition of a suitable "operator+"(?).

You probably need to operator+ for int's to std strings in antlr/String.hpp

public String toString() {
	return "CToken:" +"(" + hashCode() + ")" + "[" + getType() + "] "+ getText() + " line:" + getLine() + " source:" + source ;
}

Think this should work (untested) if you include String.hpp a little bit
depending on your choices for the return of hashCode.

std::string toString( void )
{
	std::string ret("CToken:")
	ret += "(" + hashCode() + ")" + "[" + getType() + "] "+ getText() + " line:" + getLine() + " source:" + source ;
}

Other solutions might use a ostringstream but probably a bit slower
although.. with this amount of operator+ calls it might be faster.

{
	std::ostringstream ret;
	ret << "Ctoken:(" << hashCode() 
		<<	")[" << getType() << "] " << getText() 
		<< " line:" << getLine() << " source:" << source ;
	return ret.str();		
}

It may even be that you need not implement this function since it's usually
a java-ism.

> If anyone would like to see our code for CToken.cpp and CToken.hpp I
> will of course be pleased to send them a copy, but we have checked it
> line by line against CommonToken.cpp and CommonToken.hpp and cannot see
> any significant difference.

If the problem persists send it along and I might have a look at it if I
have a few spare mins.

Cheers,

Ric
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