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 "Lookup.h"
  26 #include "NumberObject.h"
  27 #include "NumberPrototype.h"
  28
  29 namespace JSC {
  30
  31 ASSERT_CLASS_FITS_IN_CELL(NumberConstructor);
  32
  33 static JSValue numberConstructorNaNValue(ExecState*, JSValue, const Identifier&);
  34 static JSValue numberConstructorNegInfinity(ExecState*, JSValue, const Identifier&);
  35 static JSValue numberConstructorPosInfinity(ExecState*, JSValue, const Identifier&);
  36 static JSValue numberConstructorMaxValue(ExecState*, JSValue, const Identifier&);
  37 static JSValue numberConstructorMinValue(ExecState*, JSValue, const Identifier&);
  38
  39 } // namespace JSC
  40
  41 #include "NumberConstructor.lut.h"
  42
  43 namespace JSC {
  44
  45 const ClassInfo NumberConstructor::info = { "Function", &InternalFunction::info, 0, ExecState::numberTable };
  46
  47 /* Source for NumberConstructor.lut.h
  48 @begin numberTable
  49    NaN                   numberConstructorNaNValue       DontEnum|DontDelete|ReadOnly
  50    NEGATIVE_INFINITY     numberConstructorNegInfinity    DontEnum|DontDelete|ReadOnly
  51    POSITIVE_INFINITY     numberConstructorPosInfinity    DontEnum|DontDelete|ReadOnly
  52    MAX_VALUE             numberConstructorMaxValue       DontEnum|DontDelete|ReadOnly
  53    MIN_VALUE             numberConstructorMinValue       DontEnum|DontDelete|ReadOnly
  54 @end
  55 */
  56
  57 NumberConstructor::NumberConstructor(ExecState* exec, NonNullPassRefPtr<Structure> structure, NumberPrototype* numberPrototype)
  58     : InternalFunction(&exec->globalData(), structure, Identifier(exec, numberPrototype->info.className))
  59 {
  60     // Number.Prototype
  61     putDirectWithoutTransition(exec->propertyNames().prototype, numberPrototype, DontEnum | DontDelete | ReadOnly);
  62
  63     // no. of arguments for constructor
  64     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  65 }
  66
  67 bool NumberConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
  68 {
  69     return getStaticValueSlot<NumberConstructor, InternalFunction>(exec, ExecState::numberTable(exec), this, propertyName, slot);
  70 }
  71
  72 bool NumberConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
  73 {
  74     return getStaticValueDescriptor<NumberConstructor, InternalFunction>(exec, ExecState::numberTable(exec), this, propertyName, descriptor);
  75 }
  76
  77 static JSValue numberConstructorNaNValue(ExecState* exec, JSValue, const Identifier&)
  78 {
  79     return jsNaN(exec);
  80 }
  81
  82 static JSValue numberConstructorNegInfinity(ExecState* exec, JSValue, const Identifier&)
  83 {
  84     return jsNumber(exec, -Inf);
  85 }
  86
  87 static JSValue numberConstructorPosInfinity(ExecState* exec, JSValue, const Identifier&)
  88 {
  89     return jsNumber(exec, Inf);
  90 }
  91
  92 static JSValue numberConstructorMaxValue(ExecState* exec, JSValue, const Identifier&)
  93 {
  94     return jsNumber(exec, 1.7976931348623157E+308);
  95 }
  96
  97 static JSValue numberConstructorMinValue(ExecState* exec, JSValue, const Identifier&)
  98 {
  99     return jsNumber(exec, 5E-324);
 100 }
 101
 102 // ECMA 15.7.1
 103 static JSObject* constructWithNumberConstructor(ExecState* exec, JSObject*, const ArgList& args)
 104 {
 105     NumberObject* object = new (exec) NumberObject(exec->lexicalGlobalObject()->numberObjectStructure());
 106     double n = args.isEmpty() ? 0 : args.at(0).toNumber(exec);
 107     object->setInternalValue(jsNumber(exec, n));
 108     return object;
 109 }
 110
 111 ConstructType NumberConstructor::getConstructData(ConstructData& constructData)
 112 {
 113     constructData.native.function = constructWithNumberConstructor;
 114     return ConstructTypeHost;
 115 }
 116
 117 // ECMA 15.7.2
 118 static JSValue JSC_HOST_CALL callNumberConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 119 {
 120     return jsNumber(exec, args.isEmpty() ? 0 : args.at(0).toNumber(exec));
 121 }
 122
 123 CallType NumberConstructor::getCallData(CallData& callData)
 124 {
 125     callData.native.function = callNumberConstructor;
 126     return CallTypeHost;
 127 }
 128
 129 } // namespace JSC