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//
// StrictEquality.cs:
//
// Author:
// Cesar Lopez Nataren (cesar@ciencias.unam.mx)
//
// (C) 2003, Cesar Lopez Nataren
// (C) 2005, Novell Inc. (http://novell.com)
//
//
// 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.Reflection.Emit;
namespace Microsoft.JScript {
public class StrictEquality : BinaryOp {
internal StrictEquality (AST parent, AST left, AST right, JSToken op, Location location)
: base (parent, left, right, op, location)
{
}
public static bool JScriptStrictEquals (object v1, object v2)
{
IConvertible ic1 = v1 as IConvertible;
IConvertible ic2 = v2 as IConvertible;
TypeCode tc1 = Convert.GetTypeCode (v1, ic1);
TypeCode tc2 = Convert.GetTypeCode (v2, ic2);
bool both_numbers = Convert.IsNumberTypeCode (tc1) && Convert.IsNumberTypeCode (tc2);
if (tc1 != tc2 && !both_numbers)
return false;
switch (tc1) {
case TypeCode.DBNull:
case TypeCode.Empty:
return true;
case TypeCode.Boolean:
return ic1.ToBoolean (null) == ic2.ToBoolean (null);
case TypeCode.String:
return ic1.ToString (null) == ic2.ToString (null);
case TypeCode.Object:
if (v1 is ScriptFunction && v2 is ScriptFunction)
return v1 == v2 || v1.Equals (v2);
else
return v1 == v2;
default:
if (both_numbers) {
double num1;
if (Convert.IsFloatTypeCode (tc1))
num1 = ic1.ToDouble (null);
else
num1 = (double) ic1.ToInt64 (null);
double num2;
if (Convert.IsFloatTypeCode (tc2))
num2 = ic2.ToDouble (null);
else
num2 = (double) ic2.ToInt64 (null);
return num1 == num2;
}
Console.WriteLine ("StrictEquality, tc1 = {0}, tc2 = {1}", tc1, tc2);
break;
}
throw new NotImplementedException ();
}
internal override bool Resolve (Environment env)
{
bool r = true;
if (left != null)
r &= left.Resolve (env);
if (right != null)
r &= right.Resolve (env);
return r;
}
internal override bool Resolve (Environment env, bool no_effect)
{
this.no_effect = no_effect;
return Resolve (env);
}
internal override void Emit (EmitContext ec)
{
if (left != null) {
left.Emit (ec);
CodeGenerator.EmitBox (ec.ig, left);
}
if (right != null) {
right.Emit (ec);
CodeGenerator.EmitBox (ec.ig, right);
}
ec.ig.Emit (OpCodes.Call, typeof (StrictEquality).GetMethod ("JScriptStrictEquals"));
}
}
}
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