Remove unmaintained and unused YieldProlog scripting language

This hasn't been mainntained since 2008 and has not been kept up with the rest of the language infrastructure.
Hence, it almost certainly doesn't work and has never been used, afaik
If this is wrong, please say on the opensim-users/dev mailing list.
Removing to reduce maintenance burden (since it still needs to be made to compile).

1 files changed, 0 insertions, 218 deletions

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/YieldProlog/Atom.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/YieldProlog/Atom.cs
deleted file mode 100644
index 27ab04e..0000000
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/YieldProlog/Atom.cs
+++ /dev/null
@@ -1,218 +0,0 @@
-/*
- * 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;
-using System.Collections.Generic;
-using System.Text;
-
-namespace OpenSim.Region.ScriptEngine.Shared.YieldProlog
-{
-    public class Atom : IUnifiable
-    {
-        private static Dictionary<string, Atom> _atomStore = new Dictionary<string, Atom>();
-        public readonly string _name;
-        public readonly Atom _module;
-
-        /// <summary>
-        /// You should not call this constructor, but use Atom.a instead.
-        /// </summary>
-        /// <param name="name"></param>
-        /// <param name="module"></param>
-        private Atom(string name, Atom module)
-        {
-            _name = name;
-            _module = module;
-        }
-
-        /// <summary>
-        /// Return the unique Atom object for name where module is null. You should use this to create
-        /// an Atom instead of calling the Atom constructor.
-        /// </summary>
-        /// <param name="name"></param>
-        /// <returns></returns>
-        public static Atom a(string name)
-        {
-            Atom atom;
-            if (!_atomStore.TryGetValue(name, out atom))
-            {
-                atom = new Atom(name, null);
-                _atomStore[name] = atom;
-            }
-            return atom;
-        }
-
-        /// <summary>
-        /// Return an Atom object with the name and module.  If module is null or Atom.NIL,
-        /// this behaves like Atom.a(name) and returns the unique object where the module is null.
-        /// If module is not null or Atom.NIL, this may or may not be the same object as another Atom
-        /// with the same name and module.
-        /// </summary>
-        /// <param name="name"></param>
-        /// <param name="module"></param>
-        /// <returns></returns>
-        public static Atom a(string name, Atom module)
-        {
-            if (module == null || module == Atom.NIL)
-                return a(name);
-            return new Atom(name, module);
-        }
-
-        /// <summary>
-        /// If Obj is an Atom unify its _module with Module.  If the Atom's _module is null, use Atom.NIL.
-        /// </summary>
-        /// <param name="Atom"></param>
-        /// <param name="Module"></param>
-        /// <returns></returns>
-        public static IEnumerable<bool> module(object Obj, object Module)
-        {
-            Obj = YP.getValue(Obj);
-            if (Obj is Atom)
-            {
-                if (((Atom)Obj)._module == null)
-                    return YP.unify(Module, Atom.NIL);
-                else
-                    return YP.unify(Module, ((Atom)Obj)._module);
-            }
-            return YP.fail();
-        }
-
-        public static readonly Atom NIL = Atom.a("[]");
-        public static readonly Atom DOT = Atom.a(".");
-        public static readonly Atom F = Atom.a("f");
-        public static readonly Atom SLASH = Atom.a("/");
-        public static readonly Atom HAT = Atom.a("^");
-        public static readonly Atom RULE = Atom.a(":-");
-
-        public IEnumerable<bool> unify(object arg)
-        {
-            arg = YP.getValue(arg);
-            if (arg is Atom)
-                return Equals(arg) ? YP.succeed() : YP.fail();
-            else if (arg is Variable)
-                return ((Variable)arg).unify(this);
-            else
-                return YP.fail();
-        }
-
-        public void addUniqueVariables(List<Variable> variableSet)
-        {
-            // Atom does not contain variables.
-        }
-
-        public object makeCopy(Variable.CopyStore copyStore)
-        {
-            // Atom does not contain variables that need to be copied.
-            return this;
-        }
-
-        public bool termEqual(object term)
-        {
-            return Equals(YP.getValue(term));
-        }
-
-        public bool ground()
-        {
-            // Atom is always ground.
-            return true;
-        }
-
-        public override bool Equals(object obj)
-        {
-            if (obj is Atom)
-            {
-                if (_module == null && ((Atom)obj)._module == null)
-                    // When _declaringClass is null, we always use an identical object from _atomStore.
-                    return this == obj;
-                // Otherwise, ignore _declaringClass and do a normal string compare on the _name.
-                return _name == ((Atom)obj)._name;
-            }
-            return false;
-        }
-
-        public override string ToString()
-        {
-            return _name;
-        }
-
-        public override int GetHashCode()
-        {
-            // Debug: need to check _declaringClass.
-            return _name.GetHashCode();
-        }
-
-        public string toQuotedString()
-        {
-            if (_name.Length == 0)
-                return "''";
-            else if (this == Atom.NIL)
-                return "[]";
-
-            StringBuilder result = new StringBuilder(_name.Length);
-            bool useQuotes = false;
-            foreach (char c in _name)
-            {
-                int cInt = (int)c;
-                if (c == '\'')
-                {
-                    result.Append("''");
-                    useQuotes = true;
-                }
-                else if (c == '_' || cInt >= (int)'a' && cInt <= (int)'z' ||
-                         cInt >= (int)'A' && cInt <= (int)'Z' || cInt >= (int)'0' && cInt <= (int)'9')
-                    result.Append(c);
-                else
-                {
-                    // Debug: Need to handle non-printable chars.
-                    result.Append(c);
-                    useQuotes = true;
-                }
-            }
-
-            if (!useQuotes && (int)_name[0] >= (int)'a' && (int)_name[0] <= (int)'z')
-                return result.ToString();
-            else
-            {
-                // Surround in single quotes.
-                result.Append('\'');
-                return "'" + result;
-            }
-        }
-
-        /// <summary>
-        /// Return true if _name is lexicographically less than atom._name.
-        /// </summary>
-        /// <param name="atom"></param>
-        /// <returns></returns>
-        public bool lessThan(Atom atom)
-        {
-            return _name.CompareTo(atom._name) < 0;
-        }
-    }
-}