117 lines
4.8 KiB
C#
117 lines
4.8 KiB
C#
/*
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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.Tree {
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/** <summary>A node representing erroneous token range in token stream</summary> */
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[System.Serializable]
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public class CommonErrorNode : CommonTree {
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public IIntStream input;
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public IToken start;
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public IToken stop;
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public RecognitionException trappedException;
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public CommonErrorNode(ITokenStream input, IToken start, IToken stop,
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RecognitionException e) {
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//System.out.println("start: "+start+", stop: "+stop);
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if (stop == null ||
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(stop.TokenIndex < start.TokenIndex &&
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stop.Type != TokenTypes.EndOfFile)) {
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// sometimes resync does not consume a token (when LT(1) is
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// in follow set. So, stop will be 1 to left to start. adjust.
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// Also handle case where start is the first token and no token
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// is consumed during recovery; LT(-1) will return null.
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stop = start;
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}
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this.input = input;
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this.start = start;
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this.stop = stop;
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this.trappedException = e;
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}
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#region Properties
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public override bool IsNil {
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get {
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return false;
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}
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}
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public override string Text {
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get {
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string badText = null;
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if (start is IToken) {
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int i = ((IToken)start).TokenIndex;
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int j = ((IToken)stop).TokenIndex;
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if (((IToken)stop).Type == TokenTypes.EndOfFile) {
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j = ((ITokenStream)input).Count;
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}
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badText = ((ITokenStream)input).ToString(i, j);
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} else if (start is ITree) {
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badText = ((ITreeNodeStream)input).ToString(start, stop);
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} else {
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// people should subclass if they alter the tree type so this
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// next one is for sure correct.
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badText = "<unknown>";
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}
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return badText;
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}
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set {
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}
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}
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public override int Type {
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get {
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return TokenTypes.Invalid;
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}
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set {
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}
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}
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#endregion
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public override string ToString() {
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if (trappedException is MissingTokenException) {
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return "<missing type: " +
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((MissingTokenException)trappedException).MissingType +
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">";
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} else if (trappedException is UnwantedTokenException) {
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return "<extraneous: " +
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((UnwantedTokenException)trappedException).UnexpectedToken +
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", resync=" + Text + ">";
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} else if (trappedException is MismatchedTokenException) {
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return "<mismatched token: " + trappedException.Token + ", resync=" + Text + ">";
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} else if (trappedException is NoViableAltException) {
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return "<unexpected: " + trappedException.Token +
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", resync=" + Text + ">";
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}
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return "<error: " + Text + ">";
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}
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}
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}
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