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