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      1 /*
      2  *  Copyright (C) 1999-2000,2003 Harri Porten (porten (at) 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 JSValue numberConstructorNaNValue(ExecState*, const Identifier&, const PropertySlot&);
     33 static JSValue numberConstructorNegInfinity(ExecState*, const Identifier&, const PropertySlot&);
     34 static JSValue numberConstructorPosInfinity(ExecState*, const Identifier&, const PropertySlot&);
     35 static JSValue numberConstructorMaxValue(ExecState*, const Identifier&, const PropertySlot&);
     36 static JSValue 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, NonNullPassRefPtr<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 bool NumberConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
     72 {
     73     return getStaticValueDescriptor<NumberConstructor, InternalFunction>(exec, ExecState::numberTable(exec), this, propertyName, descriptor);
     74 }
     75 
     76 static JSValue numberConstructorNaNValue(ExecState* exec, const Identifier&, const PropertySlot&)
     77 {
     78     return jsNaN(exec);
     79 }
     80 
     81 static JSValue numberConstructorNegInfinity(ExecState* exec, const Identifier&, const PropertySlot&)
     82 {
     83     return jsNumber(exec, -Inf);
     84 }
     85 
     86 static JSValue numberConstructorPosInfinity(ExecState* exec, const Identifier&, const PropertySlot&)
     87 {
     88     return jsNumber(exec, Inf);
     89 }
     90 
     91 static JSValue numberConstructorMaxValue(ExecState* exec, const Identifier&, const PropertySlot&)
     92 {
     93     return jsNumber(exec, 1.7976931348623157E+308);
     94 }
     95 
     96 static JSValue numberConstructorMinValue(ExecState* exec, const Identifier&, const PropertySlot&)
     97 {
     98     return jsNumber(exec, 5E-324);
     99 }
    100 
    101 // ECMA 15.7.1
    102 static JSObject* constructWithNumberConstructor(ExecState* exec, JSObject*, const ArgList& args)
    103 {
    104     NumberObject* object = new (exec) NumberObject(exec->lexicalGlobalObject()->numberObjectStructure());
    105     double n = args.isEmpty() ? 0 : args.at(0).toNumber(exec);
    106     object->setInternalValue(jsNumber(exec, n));
    107     return object;
    108 }
    109 
    110 ConstructType NumberConstructor::getConstructData(ConstructData& constructData)
    111 {
    112     constructData.native.function = constructWithNumberConstructor;
    113     return ConstructTypeHost;
    114 }
    115 
    116 // ECMA 15.7.2
    117 static JSValue JSC_HOST_CALL callNumberConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
    118 {
    119     return jsNumber(exec, args.isEmpty() ? 0 : args.at(0).toNumber(exec));
    120 }
    121 
    122 CallType NumberConstructor::getCallData(CallData& callData)
    123 {
    124     callData.native.function = callNumberConstructor;
    125     return CallTypeHost;
    126 }
    127 
    128 } // namespace JSC
    129