160 lines
6.7 KiB
C#
160 lines
6.7 KiB
C#
/*
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* Copyright (C) 2007-2008, Jeff Thompson
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*
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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 are met:
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*
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* * 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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* * 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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* * Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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namespace OpenSim.Region.ScriptEngine.Shared.YieldProlog
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{
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/// <summary>
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/// A PrologException is used as the exception thrown by YP.throw(Term).
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/// </summary>
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public class PrologException : Exception
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{
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public readonly object _term;
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/// <summary>
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/// Create a PrologException with the given Term. The printable exception message is the full Term.
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/// </summary>
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/// <param name="Term">the term of the exception</param>
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public PrologException(object Term)
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: base(YP.getValue(Term).ToString())
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{
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_term = YP.makeCopy(Term, new Variable.CopyStore());
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}
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/// <summary>
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/// Create a PrologException where the Term is error(ErrorTerm, Message).
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/// This uses YP.makeCopy to copy the ErrorTerm and Message so that they are valid after unbinding.
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/// </summary>
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/// <param name="ErrorTerm">the error term of the error</param>
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/// <param name="Messsage">the message term of the error. If this is a string, it is converted to an
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/// Atom so it can be used by Prolog code.
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/// Message, converted to a string, is use as the printable exception message.
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/// </param>
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public PrologException(object ErrorTerm, object Message)
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: base(YP.getValue(Message).ToString())
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{
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if (Message is string)
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Message = Atom.a((string)Message);
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_term = YP.makeCopy(new Functor2(Atom.a("error"), ErrorTerm, Message), new Variable.CopyStore());
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}
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public class TypeErrorInfo
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{
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public readonly Atom _Type;
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public readonly object _Culprit;
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public readonly object _Message;
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public TypeErrorInfo(Atom Type, object Culprit, object Message)
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{
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_Type = Type;
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_Culprit = Culprit;
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_Message = Message;
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}
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}
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/// <summary>
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/// Return the TypeErrorInfo for this exception, or null if _term does not match
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/// error(type_error(Type, Culprit), Message).
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/// </summary>
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/// <returns></returns>
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public TypeErrorInfo getTypeErrorInfo()
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{
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if (!(_term is Functor2 && ((Functor2)_term)._name._name == "error"))
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return null;
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object errorTerm = ((Functor2)_term)._arg1;
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if (!(errorTerm is Functor2 && ((Functor2)errorTerm)._name._name == "type_error"))
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return null;
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if (!(((Functor2)errorTerm)._arg1 is Atom))
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return null;
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return new TypeErrorInfo
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((Atom)((Functor2)errorTerm)._arg1, ((Functor2)errorTerm)._arg2, ((Functor2)_term)._arg2);
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}
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public class ExistenceErrorInfo
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{
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public readonly Atom _Type;
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public readonly object _Culprit;
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public readonly object _Message;
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public ExistenceErrorInfo(Atom Type, object Culprit, object Message)
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{
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_Type = Type;
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_Culprit = Culprit;
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_Message = Message;
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}
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/// <summary>
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/// If _Type is procedure and _Culprit is name/artity, return the name. Otherwise return null.
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/// </summary>
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/// <returns></returns>
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public object getProcedureName()
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{
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if (!(_Type._name == "procedure" &&
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_Culprit is Functor2 && ((Functor2)_Culprit)._name == Atom.SLASH))
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return null;
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return ((Functor2)_Culprit)._arg1;
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}
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/// <summary>
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/// If _Type is procedure and _Culprit is name/arity and arity is an integer, return the arity.
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/// Otherwise return -1.
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/// </summary>
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/// <returns></returns>
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public int getProcedureArity()
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{
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if (!(_Type._name == "procedure" &&
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_Culprit is Functor2 && ((Functor2)_Culprit)._name == Atom.SLASH))
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return -1;
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if (!(((Functor2)_Culprit)._arg2 is int))
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return -1;
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return (int)((Functor2)_Culprit)._arg2;
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}
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}
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/// <summary>
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/// Return the ExistenceErrorInfo for this exception, or null if _term does not match
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/// error(existence_error(Type, Culprit), Message). If the returned ExistenceErrorInfo _Culprit is
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/// procedure, you can use its getProcedureName and getProcedureArity.
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/// </summary>
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/// <returns></returns>
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public ExistenceErrorInfo getExistenceErrorInfo()
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{
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if (!(_term is Functor2 && ((Functor2)_term)._name._name == "error"))
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return null;
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object errorTerm = ((Functor2)_term)._arg1;
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if (!(errorTerm is Functor2 && ((Functor2)errorTerm)._name._name == "existence_error"))
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return null;
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if (!(((Functor2)errorTerm)._arg1 is Atom))
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return null;
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return new ExistenceErrorInfo
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((Atom)((Functor2)errorTerm)._arg1, ((Functor2)errorTerm)._arg2, ((Functor2)_term)._arg2);
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}
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}
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}
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