runtime/StringConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2004, 2005, 2006, 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  USA
  18  *
  19  */
  20
  21 #include "config.h"
  22 #include "StringConstructor.h"
  23
  24 #include "JSGlobalObject.h"
  25 #include "PrototypeFunction.h"
  26 #include "StringPrototype.h"
  27
  28 namespace JSC {
  29
  30 static NEVER_INLINE JSValuePtr stringFromCharCodeSlowCase(ExecState* exec, const ArgList& args)
  31 {
  32     UChar* buf = static_cast<UChar*>(fastMalloc(args.size() * sizeof(UChar)));
  33     UChar* p = buf;
  34     ArgList::const_iterator end = args.end();
  35     for (ArgList::const_iterator it = args.begin(); it != end; ++it)
  36         *p++ = static_cast<UChar>((*it).jsValue(exec).toUInt32(exec));
  37     return jsString(exec, UString(buf, p - buf, false));
  38 }
  39
  40 static JSValuePtr stringFromCharCode(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
  41 {
  42     if (LIKELY(args.size() == 1))
  43         return jsSingleCharacterString(exec, args.at(exec, 0).toUInt32(exec));
  44     return stringFromCharCodeSlowCase(exec, args);
  45 }
  46
  47 ASSERT_CLASS_FITS_IN_CELL(StringConstructor);
  48
  49 StringConstructor::StringConstructor(ExecState* exec, PassRefPtr<Structure> structure, Structure* prototypeFunctionStructure, StringPrototype* stringPrototype)
  50     : InternalFunction(&exec->globalData(), structure, Identifier(exec, stringPrototype->classInfo()->className))
  51 {
  52     // ECMA 15.5.3.1 String.prototype
  53     putDirectWithoutTransition(exec->propertyNames().prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);
  54
  55     // ECMA 15.5.3.2 fromCharCode()
  56     putDirectFunctionWithoutTransition(exec, new (exec) PrototypeFunction(exec, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, stringFromCharCode), DontEnum);
  57
  58     // no. of arguments for constructor
  59     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  60 }
  61
  62 // ECMA 15.5.2
  63 static JSObject* constructWithStringConstructor(ExecState* exec, JSObject*, const ArgList& args)
  64 {
  65     if (args.isEmpty())
  66         return new (exec) StringObject(exec, exec->lexicalGlobalObject()->stringObjectStructure());
  67     return new (exec) StringObject(exec, exec->lexicalGlobalObject()->stringObjectStructure(), args.at(exec, 0).toString(exec));
  68 }
  69
  70 ConstructType StringConstructor::getConstructData(ConstructData& constructData)
  71 {
  72     constructData.native.function = constructWithStringConstructor;
  73     return ConstructTypeHost;
  74 }
  75
  76 // ECMA 15.5.1
  77 static JSValuePtr callStringConstructor(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
  78 {
  79     if (args.isEmpty())
  80         return jsEmptyString(exec);
  81     return jsString(exec, args.at(exec, 0).toString(exec));
  82 }
  83
  84 CallType StringConstructor::getCallData(CallData& callData)
  85 {
  86     callData.native.function = callStringConstructor;
  87     return CallTypeHost;
  88 }
  89
  90 } // namespace JSC