1 files changed, 103 insertions, 15 deletions

diff --git a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/YieldProlog/PrologException.cs b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/YieldProlog/PrologException.cs
index 2a23fe1..9a1f00d 100644
--- a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/YieldProlog/PrologException.cs
+++ b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/YieldProlog/PrologException.cs
@@ -1,20 +1,20 @@
 /*
  * Copyright (C) 2007-2008, Jeff Thompson
- *
+ * 
  * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
+ * 
+ * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted provided that the following conditions are met:
- *
- *     * Redistributions of source code must retain the above copyright
+ * 
+ *     * Redistributions of source code must retain the above copyright 
  *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in the
+ *     * 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.
- *     * Neither the name of the copyright holder nor the names of its contributors
- *       may be used to endorse or promote products derived from this software
+ *     * Neither the name of the copyright holder nor the names of its contributors 
+ *       may be used to endorse or promote products derived from this software 
  *       without specific prior written permission.
- *
+ * 
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
@@ -43,7 +43,6 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.YieldProlog
         /// Create a PrologException with the given Term.  The printable exception message is the full Term.
         /// </summary>
         /// <param name="Term">the term of the exception</param>
-        /// </param>
         public PrologException(object Term)
             : base(YP.getValue(Term).ToString())
         {
@@ -54,18 +53,107 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.YieldProlog
         /// Create a PrologException where the Term is error(ErrorTerm, Message).
         /// This uses YP.makeCopy to copy the ErrorTerm and Message so that they are valid after unbinding.
         /// </summary>
-        /// <param name="ErrorTerm">the term of the exception</param>
-        /// <param name="Messsage">the message, converted to a string, to use as the printable exception message
+        /// <param name="ErrorTerm">the error term of the error</param>
+        /// <param name="Messsage">the message term of the error.  If this is a string, it is converted to an 
+        /// Atom so it can be used by Prolog code.
+        /// Message, converted to a string, is use as the printable exception message.
         /// </param>
         public PrologException(object ErrorTerm, object Message)
             : base(YP.getValue(Message).ToString())
         {
+            if (Message is string)
+                Message = Atom.a((string)Message);
             _term = YP.makeCopy(new Functor2(Atom.a("error"), ErrorTerm, Message), new Variable.CopyStore());
         }
 
-        public object Term
+        public class TypeErrorInfo 
+        {
+            public readonly Atom _Type;
+            public readonly object _Culprit;
+            public readonly object _Message;
+
+            public TypeErrorInfo(Atom Type, object Culprit, object Message)
+            {
+                _Type = Type;
+                _Culprit = Culprit;
+                _Message = Message;
+            }
+        }
+        /// <summary>
+        /// Return the TypeErrorInfo for this exception, or null if _term does not match
+        ///   error(type_error(Type, Culprit), Message).
+        /// </summary>
+        /// <returns></returns>
+        public TypeErrorInfo getTypeErrorInfo()
+        {
+            if (!(_term is Functor2 && ((Functor2)_term)._name._name == "error"))
+                return null;
+            object errorTerm = ((Functor2)_term)._arg1;
+            if (!(errorTerm is Functor2 && ((Functor2)errorTerm)._name._name == "type_error"))
+                return null;
+            if (!(((Functor2)errorTerm)._arg1 is Atom))
+                return null;
+            return new TypeErrorInfo
+                ((Atom)((Functor2)errorTerm)._arg1, ((Functor2)errorTerm)._arg2, ((Functor2)_term)._arg2);
+        }
+
+        public class ExistenceErrorInfo
+        {
+            public readonly Atom _Type;
+            public readonly object _Culprit;
+            public readonly object _Message;
+
+            public ExistenceErrorInfo(Atom Type, object Culprit, object Message)
+            {
+                _Type = Type;
+                _Culprit = Culprit;
+                _Message = Message;
+            }
+
+            /// <summary>
+            /// If _Type is procedure and _Culprit is name/artity, return the name.  Otherwise return null.
+            /// </summary>
+            /// <returns></returns>
+            public object getProcedureName()
+            {
+                if (!(_Type._name == "procedure" && 
+                      _Culprit is Functor2 && ((Functor2)_Culprit)._name == Atom.SLASH))
+                    return null;
+                return ((Functor2)_Culprit)._arg1;
+            }
+
+            /// <summary>
+            /// If _Type is procedure and _Culprit is name/arity and arity is an integer, return the arity.  
+            /// Otherwise return -1.
+            /// </summary>
+            /// <returns></returns>
+            public int getProcedureArity()
+            {
+                if (!(_Type._name == "procedure" &&
+                      _Culprit is Functor2 && ((Functor2)_Culprit)._name == Atom.SLASH))
+                    return -1;
+                if (!(((Functor2)_Culprit)._arg2 is int))
+                    return -1;
+                return (int)((Functor2)_Culprit)._arg2;
+            }
+        }
+        /// <summary>
+        /// Return the ExistenceErrorInfo for this exception, or null if _term does not match
+        ///   error(existence_error(Type, Culprit), Message).  If the returned ExistenceErrorInfo _Culprit is
+        ///   procedure, you can use its getProcedureName and getProcedureArity.
+        /// </summary>
+        /// <returns></returns>
+        public ExistenceErrorInfo getExistenceErrorInfo()
         {
-            get { return _term; }
+            if (!(_term is Functor2 && ((Functor2)_term)._name._name == "error"))
+                return null;
+            object errorTerm = ((Functor2)_term)._arg1;
+            if (!(errorTerm is Functor2 && ((Functor2)errorTerm)._name._name == "existence_error"))
+                return null;
+            if (!(((Functor2)errorTerm)._arg1 is Atom))
+                return null;
+            return new ExistenceErrorInfo
+                ((Atom)((Functor2)errorTerm)._arg1, ((Functor2)errorTerm)._arg2, ((Functor2)_term)._arg2);
         }
     }
 }