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//
// Relational.cs:
//
// Author:
// Cesar Lopez Nataren (cesar@ciencias.unam.mx)
//
// (C) 2003, Cesar Lopez Nataren
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Text;
using System.Reflection;
using System.Diagnostics;
using System.Reflection.Emit;
namespace Microsoft.JScript {
public class Relational : BinaryOp {
internal Relational (AST parent, AST left, AST right, JSToken op, Location location)
: base (parent, left, right, op, location)
{
}
public Relational (int operatorTok)
: base (null, null, null, (JSToken) operatorTok, null)
{
}
[DebuggerStepThroughAttribute]
[DebuggerHiddenAttribute]
public double EvaluateRelational (object v1, object v2)
{
return JScriptCompare (v1, v2);
}
public static double JScriptCompare (object v1, object v2)
{
object p1 = Convert.ToPrimitive (v1, null);
object p2 = Convert.ToPrimitive (v2, null);
if (Convert.IsString (p1) && Convert.IsString (p2)) {
string s1 = Convert.ToString (p1);
string s2 = Convert.ToString (p2);
return s1.CompareTo (s2);
} else {
double n1 = Convert.ToNumber (p1);
double n2 = Convert.ToNumber (p2);
return n1 - n2;
}
}
internal override bool Resolve (Environment env)
{
if (left != null)
left.Resolve (env);
if (right != null)
right.Resolve (env);
return true;
}
internal override bool Resolve (Environment env, bool no_effect)
{
this.no_effect = no_effect;
return Resolve (env);
}
internal override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
if (op == JSToken.None && right == null) {
left.Emit (ec);
return;
} else if (op == JSToken.Instanceof) {
if (left != null) {
left.Emit (ec);
CodeGenerator.EmitBox (ig, left);
}
if (right != null) {
right.Emit (ec);
CodeGenerator.EmitBox (ig, right);
}
ig.Emit (OpCodes.Call, typeof (Instanceof).GetMethod ("JScriptInstanceof"));
ig.Emit (OpCodes.Box, typeof (Boolean));
return;
} else if (op == JSToken.In) {
if (left != null)
left.Emit (ec);
if (right != null)
right.Emit (ec);
ig.Emit (OpCodes.Call, typeof (In).GetMethod ("JScriptIn"));
return;
}
Type t = typeof (Relational);
LocalBuilder loc = ig.DeclareLocal (t);
ConstructorInfo ctr_info;
switch (op) {
case JSToken.GreaterThan:
ig.Emit (OpCodes.Ldc_I4_S, (byte) 57);
break;
case JSToken.LessThan:
ig.Emit (OpCodes.Ldc_I4_S, (byte) 58);
break;
case JSToken.LessThanEqual:
ig.Emit (OpCodes.Ldc_I4_S, (byte) 59);
break;
case JSToken.GreaterThanEqual:
ig.Emit (OpCodes.Ldc_I4_S, (byte) 60);
break;
}
ctr_info = typeof (Relational).GetConstructor (new Type [] { typeof (Int32) });
ig.Emit (OpCodes.Newobj, ctr_info);
ig.Emit (OpCodes.Stloc, loc);
ig.Emit (OpCodes.Ldloc, loc);
if (left != null) {
left.Emit (ec);
CodeGenerator.EmitBox (ig, left);
}
if (right != null) {
right.Emit (ec);
CodeGenerator.EmitBox (ig, right);
}
ig.Emit (OpCodes.Call, t.GetMethod ("EvaluateRelational"));
if (no_effect)
ig.Emit (OpCodes.Pop);
}
}
}
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