LLkParser.cpp
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上传日期:2007-01-06
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- /**
- * <b>SOFTWARE RIGHTS</b>
- * <p>
- * ANTLR 2.6.0 MageLang Insitute, 1998
- * <p>
- * We reserve no legal rights to the ANTLR--it is fully in the
- * public domain. An individual or company may do whatever
- * they wish with source code distributed with ANTLR or the
- * code generated by ANTLR, including the incorporation of
- * ANTLR, or its output, into commerical software.
- * <p>
- * We encourage users to develop software with ANTLR. However,
- * we do ask that credit is given to us for developing
- * ANTLR. By "credit", we mean that if you use ANTLR or
- * incorporate any source code into one of your programs
- * (commercial product, research project, or otherwise) that
- * you acknowledge this fact somewhere in the documentation,
- * research report, etc... If you like ANTLR and have
- * developed a nice tool with the output, please mention that
- * you developed it using ANTLR. In addition, we ask that the
- * headers remain intact in our source code. As long as these
- * guidelines are kept, we expect to continue enhancing this
- * system and expect to make other tools available as they are
- * completed.
- * <p>
- * The ANTLR gang:
- * @version ANTLR 2.6.0 MageLang Insitute, 1998
- * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
- * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
- * @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
- */
- #include "antlr/LLkParser.hpp"
- #include <iostream>
- ANTLR_BEGIN_NAMESPACE(antlr)
- /**An LL(k) parser.
- *
- * @see antlr.Token
- * @see antlr.TokenBuffer
- * @see antlr.LL1Parser
- */
- // LLkParser(int k_);
- LLkParser::LLkParser(const ParserSharedInputState& state, int k_)
- : Parser(state)
- { k=k_; }
- LLkParser::LLkParser(TokenBuffer& tokenBuf, int k_)
- : Parser(tokenBuf)
- { k=k_; }
- LLkParser::LLkParser(TokenStream& lexer, int k_)
- : Parser(new TokenBuffer(lexer))
- { k=k_; }
- /**Consume another token from the input stream. Can only write sequentially!
- * If you need 3 tokens ahead, you must consume() 3 times.
- * <p>
- * Note that it is possible to overwrite tokens that have not been matched.
- * For example, calling consume() 3 times when k=2, means that the first token
- * consumed will be overwritten with the 3rd.
- */
- void LLkParser::consume()
- { inputState->getInput().consume(); }
- int LLkParser::LA(int i)
- { return inputState->getInput().LA(i); }
- RefToken LLkParser::LT(int i)
- { return inputState->getInput().LT(i); }
- void LLkParser::trace(const ANTLR_USE_NAMESPACE(std)string& ee, const ANTLR_USE_NAMESPACE(std)string& rname)
- {
- ANTLR_USE_NAMESPACE(std)cout << ee.c_str() << rname.c_str() << ((inputState->guessing>0)?"; [guessing]":"; ");
- for (int i = 1; i <= k; i++)
- {
- if (i != 1) {
- ANTLR_USE_NAMESPACE(std)cout << ", ";
- }
- ANTLR_USE_NAMESPACE(std)cout << "LA(" << i << ")==" << LT(i)->getText().c_str();
- }
- ANTLR_USE_NAMESPACE(std)cout << ANTLR_USE_NAMESPACE(std)endl;
- }
- void LLkParser::traceIn(const ANTLR_USE_NAMESPACE(std)string& rname)
- { trace("enter ",rname); }
- void LLkParser::traceOut(const ANTLR_USE_NAMESPACE(std)string& rname)
- { trace("exit ",rname); }
- ANTLR_END_NAMESPACE