13447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein/* 23447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein [The "BSD license"] 33447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein Copyright (c) 2005-2009 Terence Parr 43447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein All rights reserved. 53447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 63447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein Redistribution and use in source and binary forms, with or without 73447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein modification, are permitted provided that the following conditions 83447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein are met: 93447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 1. Redistributions of source code must retain the above copyright 103447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein notice, this list of conditions and the following disclaimer. 113447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 2. Redistributions in binary form must reproduce the above copyright 123447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein notice, this list of conditions and the following disclaimer in the 133447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein documentation and/or other materials provided with the distribution. 143447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 3. The name of the author may not be used to endorse or promote products 153447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein derived from this software without specific prior written permission. 163447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 173447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 183447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 193447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 203447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 213447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 223447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 233447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 243447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 253447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 263447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 273447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein */ 283447a5916aa62f44de24cc441fc9987116ddff52Andrew Sappersteinpackage org.antlr.runtime; 293447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverimport org.antlr.runtime.debug.DebugTokenStream; 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 323447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein/** A parser for TokenStreams. "parser grammars" result in a subclass 333447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein * of this. 343447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein */ 353447a5916aa62f44de24cc441fc9987116ddff52Andrew Sappersteinpublic class Parser extends BaseRecognizer { 363447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public TokenStream input; 373447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 383447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public Parser(TokenStream input) { 393447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein super(); // highlight that we go to super to set state object 403447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein setTokenStream(input); 413447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 423447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 433447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public Parser(TokenStream input, RecognizerSharedState state) { 443447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein super(state); // share the state object with another parser 453447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein this.input = input; 463447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 473447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 483447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public void reset() { 493447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein super.reset(); // reset all recognizer state variables 503447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein if ( input!=null ) { 513447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein input.seek(0); // rewind the input 523447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 533447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 543447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 553447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein protected Object getCurrentInputSymbol(IntStream input) { 563447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein return ((TokenStream)input).LT(1); 573447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 583447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 593447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein protected Object getMissingSymbol(IntStream input, 603447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein RecognitionException e, 613447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein int expectedTokenType, 623447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein BitSet follow) 633447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein { 643447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein String tokenText = null; 653447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein if ( expectedTokenType==Token.EOF ) tokenText = "<missing EOF>"; 663447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein else tokenText = "<missing "+getTokenNames()[expectedTokenType]+">"; 673447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein CommonToken t = new CommonToken(expectedTokenType, tokenText); 683447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein Token current = ((TokenStream)input).LT(1); 693447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein if ( current.getType() == Token.EOF ) { 703447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein current = ((TokenStream)input).LT(-1); 713447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 723447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein t.line = current.getLine(); 733447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein t.charPositionInLine = current.getCharPositionInLine(); 743447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein t.channel = DEFAULT_TOKEN_CHANNEL; 75324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver t.input = current.getInputStream(); 763447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein return t; 773447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 783447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 793447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein /** Set the token stream and reset the parser */ 803447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public void setTokenStream(TokenStream input) { 813447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein this.input = null; 823447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein reset(); 833447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein this.input = input; 843447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 853447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 863447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public TokenStream getTokenStream() { 873447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein return input; 883447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 893447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 903447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public String getSourceName() { 913447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein return input.getSourceName(); 923447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 933447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 943447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public void traceIn(String ruleName, int ruleIndex) { 953447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein super.traceIn(ruleName, ruleIndex, input.LT(1)); 963447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 973447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein 983447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein public void traceOut(String ruleName, int ruleIndex) { 993447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein super.traceOut(ruleName, ruleIndex, input.LT(1)); 1003447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein } 1013447a5916aa62f44de24cc441fc9987116ddff52Andrew Sapperstein} 102