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/*
* 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.DotNetEngine.Compiler.LSL
{
public class LSL2CSCodeTransformer
{
private SYMBOL m_astRoot = null;
private static Dictionary<string, string> m_datatypeLSL2OpenSim = null;
/// <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
if (null == m_datatypeLSL2OpenSim)
{
m_datatypeLSL2OpenSim = new Dictionary<string, string>();
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");
}
}
/// <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
}
}
}
}
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