runtime/ArrayConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved.
   4  *  Copyright (C) 2003 Peter Kelly (pmk@post.com)
   5  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  20  *  USA
  21  *
  22  */
  23
  24 #include "config.h"
  25 #include "ArrayConstructor.h"
  26
  27 #include "ArrayPrototype.h"
  28 #include "JSArray.h"
  29 #include "Lookup.h"
  30
  31 namespace JSC {
  32
  33 ASSERT_CLASS_FITS_IN_CELL(ArrayConstructor);
  34
  35 ArrayConstructor::ArrayConstructor(ExecState* exec, PassRefPtr<Structure> structure, ArrayPrototype* arrayPrototype)
  36     : InternalFunction(&exec->globalData(), structure, Identifier(exec, arrayPrototype->classInfo()->className))
  37 {
  38     // ECMA 15.4.3.1 Array.prototype
  39     putDirectWithoutTransition(exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  40
  41     // no. of arguments for constructor
  42     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  43 }
  44
  45 static JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  46 {
  47     // a single numeric argument denotes the array size (!)
  48     if (args.size() == 1 && args.at(exec, 0).isNumber()) {
  49         uint32_t n = args.at(exec, 0).toUInt32(exec);
  50         if (n != args.at(exec, 0).toNumber(exec))
  51             return throwError(exec, RangeError, "Array size is not a small enough positive integer.");
  52         return new (exec) JSArray(exec->lexicalGlobalObject()->arrayStructure(), n);
  53     }
  54
  55     // otherwise the array is constructed with the arguments in it
  56     return new (exec) JSArray(exec, exec->lexicalGlobalObject()->arrayStructure(), args);
  57 }
  58
  59 static JSObject* constructWithArrayConstructor(ExecState* exec, JSObject*, const ArgList& args)
  60 {
  61     return constructArrayWithSizeQuirk(exec, args);
  62 }
  63
  64 // ECMA 15.4.2
  65 ConstructType ArrayConstructor::getConstructData(ConstructData& constructData)
  66 {
  67     constructData.native.function = constructWithArrayConstructor;
  68     return ConstructTypeHost;
  69 }
  70
  71 static JSValuePtr callArrayConstructor(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
  72 {
  73     return constructArrayWithSizeQuirk(exec, args);
  74 }
  75
  76 // ECMA 15.6.1
  77 CallType ArrayConstructor::getCallData(CallData& callData)
  78 {
  79     // equivalent to 'new Array(....)'
  80     callData.native.function = callArrayConstructor;
  81     return CallTypeHost;
  82 }
  83
  84 } // namespace JSC