kjs/operations.cpp

   1 // -*- c-basic-offset: 2 -*-
   2 /*
   3  *  This file is part of the KDE libraries
   4  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Library General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Library General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Library General Public License
  17  *  along with this library; see the file COPYING.LIB.  If not, write to
  18  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  *  Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #include "config.h"
  24 #include "operations.h"
  25
  26 #include "internal.h"
  27 #include "object.h"
  28 #include <math.h>
  29 #include <stdio.h>
  30 #include <wtf/MathExtras.h>
  31
  32 #if HAVE(FLOAT_H)
  33 #include <float.h>
  34 #endif
  35
  36 namespace KJS {
  37
  38 // ECMA 11.9.3
  39 bool equal(ExecState *exec, JSValue *v1, JSValue *v2)
  40 {
  41     JSType t1 = v1->type();
  42     JSType t2 = v2->type();
  43
  44     if (t1 != t2) {
  45         if (t1 == UndefinedType)
  46             t1 = NullType;
  47         if (t2 == UndefinedType)
  48             t2 = NullType;
  49
  50         if (t1 == BooleanType)
  51             t1 = NumberType;
  52         if (t2 == BooleanType)
  53             t2 = NumberType;
  54
  55         if (t1 == NumberType && t2 == StringType) {
  56             // use toNumber
  57         } else if (t1 == StringType && t2 == NumberType)
  58             t1 = NumberType;
  59             // use toNumber
  60         else {
  61             if ((t1 == StringType || t1 == NumberType) && t2 == ObjectType) {
  62                 v2 = v2->toPrimitive(exec);
  63                 if (exec->hadException())
  64                     return false;
  65                 return equal(exec, v1, v2);
  66             }
  67             if (t1 == NullType && t2 == ObjectType)
  68                 return static_cast<JSObject *>(v2)->masqueradeAsUndefined();
  69             if (t1 == ObjectType && (t2 == StringType || t2 == NumberType)) {
  70                 v1 = v1->toPrimitive(exec);
  71                 if (exec->hadException())
  72                     return false;
  73                 return equal(exec, v1, v2);
  74             }
  75             if (t1 == ObjectType && t2 == NullType)
  76                 return static_cast<JSObject *>(v1)->masqueradeAsUndefined();
  77             if (t1 != t2)
  78                 return false;
  79         }
  80     }
  81
  82     if (t1 == UndefinedType || t1 == NullType)
  83         return true;
  84
  85     if (t1 == NumberType) {
  86         double d1 = v1->toNumber(exec);
  87         double d2 = v2->toNumber(exec);
  88         return d1 == d2;
  89     }
  90
  91     if (t1 == StringType)
  92         return static_cast<StringImp*>(v1)->value() == static_cast<StringImp*>(v2)->value();
  93
  94     if (t1 == BooleanType)
  95         return v1->toBoolean(exec) == v2->toBoolean(exec);
  96
  97     // types are Object
  98     return v1 == v2;
  99 }
 100
 101 bool strictEqual(ExecState *exec, JSValue *v1, JSValue *v2)
 102 {
 103     JSType t1 = v1->type();
 104     JSType t2 = v2->type();
 105
 106     if (t1 != t2)
 107         return false;
 108     if (t1 == UndefinedType || t1 == NullType)
 109         return true;
 110     if (t1 == NumberType) {
 111         double n1 = v1->toNumber(exec);
 112         double n2 = v2->toNumber(exec);
 113         if (n1 == n2)
 114             return true;
 115         return false;
 116     } else if (t1 == StringType)
 117         return v1->toString(exec) == v2->toString(exec);
 118     else if (t2 == BooleanType)
 119         return v1->toBoolean(exec) == v2->toBoolean(exec);
 120
 121     if (v1 == v2)
 122         return true;
 123     /* TODO: joined objects */
 124
 125     return false;
 126 }
 127
 128 }