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Diffstat (limited to 'poxml/antlr/src/LLkParser.cpp')
| -rw-r--r-- | poxml/antlr/src/LLkParser.cpp | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/poxml/antlr/src/LLkParser.cpp b/poxml/antlr/src/LLkParser.cpp new file mode 100644 index 00000000..2f21cd8b --- /dev/null +++ b/poxml/antlr/src/LLkParser.cpp @@ -0,0 +1,105 @@ +/** + * <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) +{ + traceIndent(); + + 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) +{ + traceDepth++; + trace("> ",rname); +} + +void LLkParser::traceOut(const ANTLR_USE_NAMESPACE(std)string& rname) +{ + trace("< ",rname); + traceDepth--; +} + +ANTLR_END_NAMESPACE |