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, JSGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure, NumberPrototype* numberPrototype)

    58     : InternalFunction(&exec->globalData(), globalObject, 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 EncodedJSValue JSC_HOST_CALL constructWithNumberConstructor(ExecState* exec)

   104 {

   105     NumberObject* object = new (exec) NumberObject(exec->lexicalGlobalObject()->numberObjectStructure());

   106     double n = exec->argumentCount() ? exec->argument(0).toNumber(exec) : 0;

   107     object->setInternalValue(jsNumber(exec, n));

   108     return JSValue::encode(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 EncodedJSValue JSC_HOST_CALL callNumberConstructor(ExecState* exec)

   119 {

   120     return JSValue::encode(jsNumber(exec, !exec->argumentCount() ? 0 : exec->argument(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