1 /* 2 * [The "BSD licence"] 3 * Copyright (c) 2005-2011 Terence Parr 4 * All rights reserved. 5 * 6 * Conversion to C#: 7 * Copyright (c) 2008-2011 Sam Harwell, Pixel Mine, Inc. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 namespace Antlr.Runtime 34 { 35 using ConditionalAttribute = System.Diagnostics.ConditionalAttribute; 36 37 /** <summary> 38 * A parser for TokenStreams. "parser grammars" result in a subclass 39 * of this. 40 * </summary> 41 */ 42 public class Parser : BaseRecognizer 43 { 44 public ITokenStream input; 45 Parser( ITokenStream input )46 public Parser( ITokenStream input ) 47 : base() 48 { 49 //super(); // highlight that we go to super to set state object 50 TokenStream = input; 51 } 52 Parser( ITokenStream input, RecognizerSharedState state )53 public Parser( ITokenStream input, RecognizerSharedState state ) 54 : base(state) // share the state object with another parser 55 { 56 this.input = input; 57 } 58 Reset()59 public override void Reset() 60 { 61 base.Reset(); // reset all recognizer state variables 62 if ( input != null ) 63 { 64 input.Seek( 0 ); // rewind the input 65 } 66 } 67 GetCurrentInputSymbol( IIntStream input )68 protected override object GetCurrentInputSymbol( IIntStream input ) 69 { 70 return ( (ITokenStream)input ).LT( 1 ); 71 } 72 GetMissingSymbol( IIntStream input, RecognitionException e, int expectedTokenType, BitSet follow )73 protected override object GetMissingSymbol( IIntStream input, 74 RecognitionException e, 75 int expectedTokenType, 76 BitSet follow ) 77 { 78 string tokenText = null; 79 if ( expectedTokenType == TokenTypes.EndOfFile ) 80 tokenText = "<missing EOF>"; 81 else 82 tokenText = "<missing " + TokenNames[expectedTokenType] + ">"; 83 CommonToken t = new CommonToken( expectedTokenType, tokenText ); 84 IToken current = ( (ITokenStream)input ).LT( 1 ); 85 if ( current.Type == TokenTypes.EndOfFile ) 86 { 87 current = ( (ITokenStream)input ).LT( -1 ); 88 } 89 t.Line = current.Line; 90 t.CharPositionInLine = current.CharPositionInLine; 91 t.Channel = DefaultTokenChannel; 92 t.InputStream = current.InputStream; 93 return t; 94 } 95 96 /** <summary>Gets or sets the token stream; resets the parser upon a set.</summary> */ 97 public virtual ITokenStream TokenStream 98 { 99 get 100 { 101 return input; 102 } 103 set 104 { 105 input = null; 106 Reset(); 107 input = value; 108 } 109 } 110 111 public override string SourceName 112 { 113 get 114 { 115 return input.SourceName; 116 } 117 } 118 119 [Conditional("ANTLR_TRACE")] TraceIn( string ruleName, int ruleIndex )120 public virtual void TraceIn( string ruleName, int ruleIndex ) 121 { 122 base.TraceIn( ruleName, ruleIndex, input.LT( 1 ) ); 123 } 124 125 [Conditional("ANTLR_TRACE")] TraceOut( string ruleName, int ruleIndex )126 public virtual void TraceOut( string ruleName, int ruleIndex ) 127 { 128 base.TraceOut( ruleName, ruleIndex, input.LT( 1 ) ); 129 } 130 } 131 } 132