another patch from Mike: the llscript compiler is now available in XEngine as well. Thanks Mike

1 files changed, 186 insertions, 0 deletions

diff --git a/OpenSim/Region/ScriptEngine/Shared/CodeTools/LSL2CSCodeTransformer.cs b/OpenSim/Region/ScriptEngine/Shared/CodeTools/LSL2CSCodeTransformer.cs
new file mode 100644
index 0000000..a7ca18c
--- /dev/null
+++ b/OpenSim/Region/ScriptEngine/Shared/CodeTools/LSL2CSCodeTransformer.cs
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * 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 OpenSim Project 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 DEVELOPERS ``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 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 Tools;
+
+namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
+{
+    public class LSL2CSCodeTransformer
+    {
+        private SYMBOL m_astRoot = null;
+        private static Dictionary<string, string> m_datatypeLSL2OpenSim = new Dictionary<string, string>();
+
+        /// <summary>
+        /// Pass the new CodeTranformer an abstract syntax tree.
+        /// </summary>
+        /// <param name="astRoot">The root node of the AST.</param>
+        public LSL2CSCodeTransformer(SYMBOL astRoot)
+        {
+            m_astRoot = astRoot;
+
+            // let's populate the dictionary
+            try
+            {
+                m_datatypeLSL2OpenSim.Add("integer", "LSL_Types.LSLInteger");
+                m_datatypeLSL2OpenSim.Add("float", "LSL_Types.LSLFloat");
+                //m_datatypeLSL2OpenSim.Add("key", "LSL_Types.key"); // key doesn't seem to be used
+                m_datatypeLSL2OpenSim.Add("key", "LSL_Types.LSLString");
+                m_datatypeLSL2OpenSim.Add("string", "LSL_Types.LSLString");
+                m_datatypeLSL2OpenSim.Add("vector", "LSL_Types.Vector3");
+                m_datatypeLSL2OpenSim.Add("rotation", "LSL_Types.Quaternion");
+                m_datatypeLSL2OpenSim.Add("list", "LSL_Types.list");
+            }
+            catch
+            {
+                // temporary workaround since we are adding to a static datatype
+            }
+        }
+
+        /// <summary>
+        /// Transform the code in the AST we have.
+        /// </summary>
+        /// <returns>The root node of the transformed AST</returns>
+        public SYMBOL Transform()
+        {
+            foreach (SYMBOL s in m_astRoot.kids)
+                TransformNode(s);
+
+            return m_astRoot;
+        }
+
+        /// <summary>
+        /// Recursively called to transform each type of node. Will transform this
+        /// node, then all it's children.
+        /// </summary>
+        /// <param name="s">The current node to transform.</param>
+        private void TransformNode(SYMBOL s)
+        {
+            // make sure to put type lower in the inheritance hierarchy first
+            // ie: since IdentConstant and StringConstant inherit from Constant,
+            // put IdentConstant and StringConstant before Constant
+            if (s is Declaration)
+                ((Declaration) s).Datatype = m_datatypeLSL2OpenSim[((Declaration) s).Datatype];
+            else if (s is Constant)
+                ((Constant) s).Type = m_datatypeLSL2OpenSim[((Constant) s).Type];
+            else if (s is TypecastExpression)
+                ((TypecastExpression) s).TypecastType = m_datatypeLSL2OpenSim[((TypecastExpression) s).TypecastType];
+            else if (s is GlobalFunctionDefinition && "void" != ((GlobalFunctionDefinition) s).ReturnType) // we don't need to translate "void"
+                ((GlobalFunctionDefinition) s).ReturnType = m_datatypeLSL2OpenSim[((GlobalFunctionDefinition) s).ReturnType];
+
+            for (int i = 0; i < s.kids.Count; i++)
+            {
+                if (!(s is Assignment || s is ArgumentDeclarationList) && s.kids[i] is Declaration)
+                    AddImplicitInitialization(s, i);
+
+                TransformNode((SYMBOL) s.kids[i]);
+            }
+        }
+
+        /// <summary>
+        /// Replaces an instance of the node at s.kids[didx] with an assignment
+        /// node. The assignment node has the Declaration node on the left hand
+        /// side and a default initializer on the right hand side.
+        /// </summary>
+        /// <param name="s">
+        /// The node containing the Declaration node that needs replacing.
+        /// </param>
+        /// <param name="didx">Index of the Declaration node to replace.</param>
+        private void AddImplicitInitialization(SYMBOL s, int didx)
+        {
+            // We take the kids for a while to play with them.
+            int sKidSize = s.kids.Count;
+            object [] sKids = new object[sKidSize];
+            for (int i = 0; i < sKidSize; i++)
+                sKids[i] = s.kids.Pop();
+
+            // The child to be changed.
+            Declaration currentDeclaration = (Declaration) sKids[didx];
+
+            // We need an assignment node.
+            Assignment newAssignment = new Assignment(currentDeclaration.yyps,
+                                                      currentDeclaration,
+                                                      GetZeroConstant(currentDeclaration.yyps, currentDeclaration.Datatype),
+                                                      "=");
+            sKids[didx] = newAssignment;
+
+            // Put the kids back where they belong.
+            for (int i = 0; i < sKidSize; i++)
+                s.kids.Add(sKids[i]);
+        }
+
+        /// <summary>
+        /// Generates the node structure required to generate a default
+        /// initialization.
+        /// </summary>
+        /// <param name="p">
+        /// Tools.Parser instance to use when instantiating nodes.
+        /// </param>
+        /// <param name="constantType">String describing the datatype.</param>
+        /// <returns>
+        /// A SYMBOL node conaining the appropriate structure for intializing a
+        /// constantType.
+        /// </returns>
+        private SYMBOL GetZeroConstant(Parser p, string constantType)
+        {
+            switch (constantType)
+            {
+            case "integer":
+                return new Constant(p, constantType, "0");
+            case "float":
+                return new Constant(p, constantType, "0.0");
+            case "string":
+            case "key":
+                return new Constant(p, constantType, "");
+            case "list":
+                ArgumentList al = new ArgumentList(p);
+                return new ListConstant(p, al);
+            case "vector":
+                Constant vca = new Constant(p, "float", "0.0");
+                Constant vcb = new Constant(p, "float", "0.0");
+                Constant vcc = new Constant(p, "float", "0.0");
+                ConstantExpression vcea = new ConstantExpression(p, vca);
+                ConstantExpression vceb = new ConstantExpression(p, vcb);
+                ConstantExpression vcec = new ConstantExpression(p, vcc);
+                return new VectorConstant(p, vcea, vceb, vcec);
+            case "rotation":
+                Constant rca = new Constant(p, "float", "0.0");
+                Constant rcb = new Constant(p, "float", "0.0");
+                Constant rcc = new Constant(p, "float", "0.0");
+                Constant rcd = new Constant(p, "float", "0.0");
+                ConstantExpression rcea = new ConstantExpression(p, rca);
+                ConstantExpression rceb = new ConstantExpression(p, rcb);
+                ConstantExpression rcec = new ConstantExpression(p, rcc);
+                ConstantExpression rced = new ConstantExpression(p, rcd);
+                return new RotationConstant(p, rcea, rceb, rcec, rced);
+            default:
+                return null; // this will probably break stuff
+            }
+        }
+    }
+}