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116 lines
4.3 KiB
116 lines
4.3 KiB
/*
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* [The "BSD licence"]
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* Copyright (c) 2005-2008 Terence Parr
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* All rights reserved.
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*
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* Conversion to C#:
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* Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Antlr.Runtime {
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using ConditionalAttribute = System.Diagnostics.ConditionalAttribute;
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/** <summary>
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* A parser for TokenStreams. "parser grammars" result in a subclass
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* of this.
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* </summary>
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*/
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public class Parser : BaseRecognizer {
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public ITokenStream input;
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public Parser(ITokenStream input)
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: base() {
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//super(); // highlight that we go to super to set state object
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TokenStream = input;
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}
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public Parser(ITokenStream input, RecognizerSharedState state)
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: base(state) // share the state object with another parser
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{
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this.input = input;
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}
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public override void Reset() {
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base.Reset(); // reset all recognizer state variables
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if (input != null) {
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input.Seek(0); // rewind the input
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}
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}
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protected override object GetCurrentInputSymbol(IIntStream input) {
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return ((ITokenStream)input).LT(1);
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}
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protected override object GetMissingSymbol(IIntStream input,
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RecognitionException e,
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int expectedTokenType,
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BitSet follow) {
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string tokenText = null;
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if (expectedTokenType == TokenTypes.EndOfFile)
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tokenText = "<missing EOF>";
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else
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tokenText = "<missing " + TokenNames[expectedTokenType] + ">";
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CommonToken t = new CommonToken(expectedTokenType, tokenText);
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IToken current = ((ITokenStream)input).LT(1);
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if (current.Type == TokenTypes.EndOfFile) {
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current = ((ITokenStream)input).LT(-1);
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}
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t.Line = current.Line;
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t.CharPositionInLine = current.CharPositionInLine;
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t.Channel = DefaultTokenChannel;
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return t;
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}
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/** <summary>Gets or sets the token stream; resets the parser upon a set.</summary> */
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public virtual ITokenStream TokenStream {
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get {
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return input;
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}
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set {
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input = null;
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Reset();
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input = value;
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}
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}
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public override string SourceName {
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get {
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return input.SourceName;
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}
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}
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[Conditional("ANTLR_TRACE")]
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public virtual void TraceIn(string ruleName, int ruleIndex) {
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base.TraceIn(ruleName, ruleIndex, input.LT(1));
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}
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[Conditional("ANTLR_TRACE")]
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public virtual void TraceOut(string ruleName, int ruleIndex) {
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base.TraceOut(ruleName, ruleIndex, input.LT(1));
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}
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}
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}
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