1 files changed, 142 insertions, 0 deletions
diff --git a/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonErrorNode.cs b/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonErrorNode.cs
new file mode 100644
index 0000000..3bd9138
--- /dev/null
+++ b/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonErrorNode.cs
@@ -0,0 +1,142 @@
+/*
+ * [The "BSD licence"]
+ * Copyright (c) 2005-2008 Terence Parr
+ * All rights reserved.
+ *
+ * Conversion to C#:
+ * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace Antlr.Runtime.Tree
+{
+
+    /** <summary>A node representing erroneous token range in token stream</summary> */
+    [System.Serializable]
+    public class CommonErrorNode : CommonTree
+    {
+        public IIntStream input;
+        public IToken start;
+        public IToken stop;
+        public RecognitionException trappedException;
+
+        public CommonErrorNode( ITokenStream input, IToken start, IToken stop,
+                               RecognitionException e )
+        {
+            //System.out.println("start: "+start+", stop: "+stop);
+            if ( stop == null ||
+                 ( stop.TokenIndex < start.TokenIndex &&
+                  stop.Type != TokenTypes.EndOfFile ) )
+            {
+                // sometimes resync does not consume a token (when LT(1) is
+                // in follow set.  So, stop will be 1 to left to start. adjust.
+                // Also handle case where start is the first token and no token
+                // is consumed during recovery; LT(-1) will return null.
+                stop = start;
+            }
+            this.input = input;
+            this.start = start;
+            this.stop = stop;
+            this.trappedException = e;
+        }
+
+        #region Properties
+        public override bool IsNil
+        {
+            get
+            {
+                return false;
+            }
+        }
+        public override string Text
+        {
+            get
+            {
+                string badText = null;
+                if ( start is IToken )
+                {
+                    int i = ( (IToken)start ).TokenIndex;
+                    int j = ( (IToken)stop ).TokenIndex;
+                    if ( ( (IToken)stop ).Type == TokenTypes.EndOfFile )
+                    {
+                        j = ( (ITokenStream)input ).Count;
+                    }
+                    badText = ( (ITokenStream)input ).ToString( i, j );
+                }
+                else if ( start is ITree )
+                {
+                    badText = ( (ITreeNodeStream)input ).ToString( start, stop );
+                }
+                else
+                {
+                    // people should subclass if they alter the tree type so this
+                    // next one is for sure correct.
+                    badText = "<unknown>";
+                }
+                return badText;
+            }
+            set
+            {
+            }
+        }
+        public override int Type
+        {
+            get
+            {
+                return TokenTypes.Invalid;
+            }
+            set
+            {
+            }
+        }
+        #endregion
+
+        public override string ToString()
+        {
+            if ( trappedException is MissingTokenException )
+            {
+                return "<missing type: " +
+                       ( (MissingTokenException)trappedException ).MissingType +
+                       ">";
+            }
+            else if ( trappedException is UnwantedTokenException )
+            {
+                return "<extraneous: " +
+                       ( (UnwantedTokenException)trappedException ).UnexpectedToken +
+                       ", resync=" + Text + ">";
+            }
+            else if ( trappedException is MismatchedTokenException )
+            {
+                return "<mismatched token: " + trappedException.Token + ", resync=" + Text + ">";
+            }
+            else if ( trappedException is NoViableAltException )
+            {
+                return "<unexpected: " + trappedException.Token +
+                       ", resync=" + Text + ">";
+            }
+            return "<error: " + Text + ">";
+        }
+    }
+}