[antlr-interest] Re: Getting Column and Line in CPP AST's
jenlhunt2003
steam at tapisinc.com
Fri Feb 13 08:00:51 PST 2004
Ric Klaren sent me the following custom AST for 2.7.2/3 based on Peter
Morlings getLine() program (found at
http://www.imada.sdu.dk/~morling/issue4.htm. I have succesfully used
this with VC++6. Thanks Ric!
my_ast.h
//////////////////////////////////////
#ifndef __MY_AST_H__
#define __MY_AST_H__
#include <string>
#include <antlr/CommonAST.hpp>
class MyAST;
typedef ANTLR_USE_NAMESPACE(antlr)ASTRefCount<MyAST> RefMyAST;
class MyAST : public ANTLR_USE_NAMESPACE(antlr)CommonAST {
public:
MyAST( const MyAST& other )
: CommonAST(other)
, line(other.line)
{
}
MyAST( void ) : CommonAST(), line(0) {}
virtual ~MyAST( void ) {}
virtual int getLine( void ) const
{
// most of the time the line number is not set if the node is a
// imaginary one. Usually this means it has a child. Refer to the
// child line number. Of course this could be extended a bit.
if ( line != 0 )
return line;
if( getFirstChild() )
return ( RefMyAST(getFirstChild())->getLine() );
return 0;
}
virtual void setLine( int l )
{
line = l;
}
virtual void initialize(int t, const ANTLR_USE_NAMESPACE(std)string&
txt)
{
CommonAST::initialize(t,txt);
line = 0;
}
virtual void initialize( ANTLR_USE_NAMESPACE(antlr)RefToken t )
{
CommonAST::initialize(t);
line = t->getLine();
}
virtual void initialize( RefMyAST ast )
{
CommonAST::initialize(ANTLR_USE_NAMESPACE(antlr)RefAST(ast));
line = ast->getLine();
}
// for convenience will also work without
void addChild( RefMyAST c )
{
BaseAST::addChild( ANTLR_USE_NAMESPACE(antlr)RefAST(c) );
}
// for convenience will also work without
void setNextSibling( RefMyAST c )
{
BaseAST::setNextSibling( ANTLR_USE_NAMESPACE(antlr)RefAST(c) );
}
virtual ANTLR_USE_NAMESPACE(antlr)RefAST clone( void )
{
return ANTLR_USE_NAMESPACE(antlr)RefAST(new MyAST(*this));
}
static ANTLR_USE_NAMESPACE(antlr)RefAST factory( void )
{
return ANTLR_USE_NAMESPACE(antlr)RefAST(RefMyAST(new MyAST()));
}
private:
int line;
};
#endif
//////////////////////////////////////
Usage:
#include "my_ast.h"
ASTLabelType = "RefMyAST";
RefMyAST t = parser.getAST();
ASTFactory ast_factory("MyAST",MyAST::factory);
parser.initializeASTFactory(ast_factory);
parser.setASTFactory(&ast_factory);
walker.TopRule(t);
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