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/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
* $Id$
*/
#include "antlr/Parser.h"
#include <iostream>
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif
/** A generic ANTLR parser (LL(k) for k>=1) containing a bunch of
* utility routines useful at any lookahead depth. We distinguish between
* the LL(1) and LL(k) parsers because of efficiency. This may not be
* necessary in the near future.
*
* Each parser object contains the state of the parse including a lookahead
* cache (the form of which is determined by the subclass), whether or
* not the parser is in guess mode, where tokens come from, etc...
*
* <p>
* During <b>guess</b> mode, the current lookahead token(s) and token type(s)
* cache must be saved because the token stream may not have been informed
* to save the token (via <tt>mark</tt>) before the <tt>try</tt> block.
* Guessing is started by:
* <ol>
* <li>saving the lookahead cache.
* <li>marking the current position in the TokenBuffer.
* <li>increasing the guessing level.
* </ol>
*
* After guessing, the parser state is restored by:
* <ol>
* <li>restoring the lookahead cache.
* <li>rewinding the TokenBuffer.
* <li>decreasing the guessing level.
* </ol>
*
* @see antlr.Token
* @see antlr.TokenBuffer
* @see antlr.TokenStream
* @see antlr.LL1Parser
* @see antlr.LLkParser
*/
bool DEBUG_PARSER = false;
/** Parser error-reporting function can be overridden in subclass */
void Parser::reportError(const RecognitionException& ex)
{
ANTLR_USE_NAMESPACE(std)cerr << ex.toString().c_str() << ANTLR_USE_NAMESPACE(std)endl;
}
/** Parser error-reporting function can be overridden in subclass */
void Parser::reportError(const ANTLR_USE_NAMESPACE(std)string& s)
{
if ( getFilename()=="" )
ANTLR_USE_NAMESPACE(std)cerr << "error: " << s.c_str() << ANTLR_USE_NAMESPACE(std)endl;
else
ANTLR_USE_NAMESPACE(std)cerr << getFilename().c_str() << ": error: " << s.c_str() << ANTLR_USE_NAMESPACE(std)endl;
}
/** Parser warning-reporting function can be overridden in subclass */
void Parser::reportWarning(const ANTLR_USE_NAMESPACE(std)string& s)
{
if ( getFilename()=="" )
ANTLR_USE_NAMESPACE(std)cerr << "warning: " << s.c_str() << ANTLR_USE_NAMESPACE(std)endl;
else
ANTLR_USE_NAMESPACE(std)cerr << getFilename().c_str() << ": warning: " << s.c_str() << ANTLR_USE_NAMESPACE(std)endl;
}
/** Set or change the input token buffer */
// void setTokenBuffer(TokenBuffer<Token>* t);
void Parser::traceIndent()
{
for( int i = 0; i < traceDepth; i++ )
ANTLR_USE_NAMESPACE(std)cout << " ";
}
void Parser::traceIn(const char* rname)
{
traceDepth++;
for( int i = 0; i < traceDepth; i++ )
ANTLR_USE_NAMESPACE(std)cout << " ";
ANTLR_USE_NAMESPACE(std)cout << "> " << rname
<< "; LA(1)==" << LT(1)->getText().c_str()
<< ((inputState->guessing>0)?" [guessing]":"")
<< ANTLR_USE_NAMESPACE(std)endl;
}
void Parser::traceOut(const char* rname)
{
for( int i = 0; i < traceDepth; i++ )
ANTLR_USE_NAMESPACE(std)cout << " ";
ANTLR_USE_NAMESPACE(std)cout << "< " << rname
<< "; LA(1)==" << LT(1)->getText().c_str()
<< ((inputState->guessing>0)?" [guessing]":"")
<< ANTLR_USE_NAMESPACE(std)endl;
traceDepth--;
}
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif
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