runtime/NumberConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000,2003 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  18  *  USA
  19  *
  20  */
  21
  22 #include "config.h"
  23 #include "NumberConstructor.h"
  24
  25 #include "NumberObject.h"
  26 #include "NumberPrototype.h"
  27
  28 namespace JSC {
  29
  30 ASSERT_CLASS_FITS_IN_CELL(NumberConstructor);
  31
  32 static JSValuePtr numberConstructorNaNValue(ExecState*, const Identifier&, const PropertySlot&);
  33 static JSValuePtr numberConstructorNegInfinity(ExecState*, const Identifier&, const PropertySlot&);
  34 static JSValuePtr numberConstructorPosInfinity(ExecState*, const Identifier&, const PropertySlot&);
  35 static JSValuePtr numberConstructorMaxValue(ExecState*, const Identifier&, const PropertySlot&);
  36 static JSValuePtr numberConstructorMinValue(ExecState*, const Identifier&, const PropertySlot&);
  37
  38 } // namespace JSC
  39
  40 #include "NumberConstructor.lut.h"
  41
  42 namespace JSC {
  43
  44 const ClassInfo NumberConstructor::info = { "Function", &InternalFunction::info, 0, ExecState::numberTable };
  45
  46 /* Source for NumberConstructor.lut.h
  47 @begin numberTable
  48    NaN                   numberConstructorNaNValue       DontEnum|DontDelete|ReadOnly
  49    NEGATIVE_INFINITY     numberConstructorNegInfinity    DontEnum|DontDelete|ReadOnly
  50    POSITIVE_INFINITY     numberConstructorPosInfinity    DontEnum|DontDelete|ReadOnly
  51    MAX_VALUE             numberConstructorMaxValue       DontEnum|DontDelete|ReadOnly
  52    MIN_VALUE             numberConstructorMinValue       DontEnum|DontDelete|ReadOnly
  53 @end
  54 */
  55
  56 NumberConstructor::NumberConstructor(ExecState* exec, PassRefPtr<Structure> structure, NumberPrototype* numberPrototype)
  57     : InternalFunction(&exec->globalData(), structure, Identifier(exec, numberPrototype->info.className))
  58 {
  59     // Number.Prototype
  60     putDirectWithoutTransition(exec->propertyNames().prototype, numberPrototype, DontEnum | DontDelete | ReadOnly);
  61
  62     // no. of arguments for constructor
  63     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  64 }
  65
  66 bool NumberConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
  67 {
  68     return getStaticValueSlot<NumberConstructor, InternalFunction>(exec, ExecState::numberTable(exec), this, propertyName, slot);
  69 }
  70
  71 JSValuePtr numberConstructorNaNValue(ExecState* exec, const Identifier&, const PropertySlot&)
  72 {
  73     return jsNaN(exec);
  74 }
  75
  76 JSValuePtr numberConstructorNegInfinity(ExecState* exec, const Identifier&, const PropertySlot&)
  77 {
  78     return jsNumber(exec, -Inf);
  79 }
  80
  81 JSValuePtr numberConstructorPosInfinity(ExecState* exec, const Identifier&, const PropertySlot&)
  82 {
  83     return jsNumber(exec, Inf);
  84 }
  85
  86 JSValuePtr numberConstructorMaxValue(ExecState* exec, const Identifier&, const PropertySlot&)
  87 {
  88     return jsNumber(exec, 1.7976931348623157E+308);
  89 }
  90
  91 JSValuePtr numberConstructorMinValue(ExecState* exec, const Identifier&, const PropertySlot&)
  92 {
  93     return jsNumber(exec, 5E-324);
  94 }
  95
  96 // ECMA 15.7.1
  97 static JSObject* constructWithNumberConstructor(ExecState* exec, JSObject*, const ArgList& args)
  98 {
  99     NumberObject* object = new (exec) NumberObject(exec->lexicalGlobalObject()->numberObjectStructure());
 100     double n = args.isEmpty() ? 0 : args.at(exec, 0).toNumber(exec);
 101     object->setInternalValue(jsNumber(exec, n));
 102     return object;
 103 }
 104
 105 ConstructType NumberConstructor::getConstructData(ConstructData& constructData)
 106 {
 107     constructData.native.function = constructWithNumberConstructor;
 108     return ConstructTypeHost;
 109 }
 110
 111 // ECMA 15.7.2
 112 static JSValuePtr callNumberConstructor(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 113 {
 114     return jsNumber(exec, args.isEmpty() ? 0 : args.at(exec, 0).toNumber(exec));
 115 }
 116
 117 CallType NumberConstructor::getCallData(CallData& callData)
 118 {
 119     callData.native.function = callNumberConstructor;
 120     return CallTypeHost;
 121 }
 122
 123 } // namespace JSC