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/*
* Copyright (C) 2007-2008, Jeff Thompson
*
* All rights reserved.
*
* 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
* 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
* 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
* 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
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS 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.
*/
using System;
namespace OpenSim.Region.ScriptEngine.Shared.YieldProlog
{
/// <summary>
/// A PrologException is used as the exception thrown by YP.throw(Term).
/// </summary>
public class PrologException : Exception
{
public readonly object _term;
/// <summary>
/// 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>
public PrologException(object Term)
: base(YP.getValue(Term).ToString())
{
_term = YP.makeCopy(Term, new Variable.CopyStore());
}
/// <summary>
/// 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 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 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()
{
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);
}
}
}
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