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 "Error.h"
  25 #include "Executable.h"
  26 #include "JITCode.h"
  27 #include "JSFunction.h"
  28 #include "JSGlobalObject.h"
  29 #include "JSCInlines.h"
  30 #include "StringPrototype.h"
  31
  32 namespace JSC {
  33
  34 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState*);
  35 static EncodedJSValue JSC_HOST_CALL stringFromCodePoint(ExecState*);
  36
  37 }
  38
  39 #include "StringConstructor.lut.h"
  40
  41 namespace JSC {
  42
  43 const ClassInfo StringConstructor::s_info = { "Function", &InternalFunction::s_info, &stringConstructorTable, CREATE_METHOD_TABLE(StringConstructor) };
  44
  45 /* Source for StringConstructor.lut.h
  46 @begin stringConstructorTable
  47   fromCharCode          stringFromCharCode         DontEnum|Function 1
  48   fromCodePoint         stringFromCodePoint        DontEnum|Function 1
  49   raw                   stringRaw                  DontEnum|Function 1
  50 @end
  51 */
  52
  53 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(StringConstructor);
  54
  55 StringConstructor::StringConstructor(VM& vm, Structure* structure)
  56     : InternalFunction(vm, structure)
  57 {
  58 }
  59
  60 void StringConstructor::finishCreation(VM& vm, StringPrototype* stringPrototype)
  61 {
  62     Base::finishCreation(vm, stringPrototype->classInfo()->className);
  63     putDirectWithoutTransition(vm, vm.propertyNames->prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);
  64     putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  65 }
  66
  67 bool StringConstructor::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
  68 {
  69     return getStaticFunctionSlot<InternalFunction>(exec, stringConstructorTable, jsCast<StringConstructor*>(object), propertyName, slot);
  70 }
  71
  72 // ------------------------------ Functions --------------------------------
  73
  74 static NEVER_INLINE JSValue stringFromCharCodeSlowCase(ExecState* exec)
  75 {
  76     unsigned length = exec->argumentCount();
  77     UChar* buf;
  78     PassRefPtr<StringImpl> impl = StringImpl::createUninitialized(length, buf);
  79     for (unsigned i = 0; i < length; ++i)
  80         buf[i] = static_cast<UChar>(exec->uncheckedArgument(i).toUInt32(exec));
  81     return jsString(exec, impl);
  82 }
  83
  84 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec)
  85 {
  86     if (LIKELY(exec->argumentCount() == 1))
  87         return JSValue::encode(jsSingleCharacterString(exec, exec->uncheckedArgument(0).toUInt32(exec)));
  88     return JSValue::encode(stringFromCharCodeSlowCase(exec));
  89 }
  90
  91 JSCell* JSC_HOST_CALL stringFromCharCode(ExecState* exec, int32_t arg)
  92 {
  93     return jsSingleCharacterString(exec, arg);
  94 }
  95
  96 static EncodedJSValue JSC_HOST_CALL stringFromCodePoint(ExecState* exec)
  97 {
  98     unsigned length = exec->argumentCount();
  99     StringBuilder builder;
 100     builder.reserveCapacity(length);
 101
 102     for (unsigned i = 0; i < length; ++i) {
 103         double codePointAsDouble = exec->uncheckedArgument(i).toNumber(exec);
 104         if (exec->hadException())
 105             return JSValue::encode(jsUndefined());
 106
 107         uint32_t codePoint = static_cast<uint32_t>(codePointAsDouble);
 108
 109         if (codePoint != codePointAsDouble || codePoint > UCHAR_MAX_VALUE)
 110             return throwVMError(exec, createRangeError(exec, ASCIILiteral("Arguments contain a value that is out of range of code points")));
 111
 112         if (U_IS_BMP(codePoint))
 113             builder.append(static_cast<UChar>(codePoint));
 114         else {
 115             builder.append(U16_LEAD(codePoint));
 116             builder.append(U16_TRAIL(codePoint));
 117         }
 118     }
 119
 120     return JSValue::encode(jsString(exec, builder.toString()));
 121 }
 122
 123 static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState* exec)
 124 {
 125     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
 126     VM& vm = exec->vm();
 127
 128     if (!exec->argumentCount())
 129         return JSValue::encode(StringObject::create(vm, globalObject->stringObjectStructure()));
 130
 131     return JSValue::encode(StringObject::create(vm, globalObject->stringObjectStructure(), exec->uncheckedArgument(0).toString(exec)));
 132 }
 133
 134 ConstructType StringConstructor::getConstructData(JSCell*, ConstructData& constructData)
 135 {
 136     constructData.native.function = constructWithStringConstructor;
 137     return ConstructTypeHost;
 138 }
 139
 140 JSCell* stringConstructor(ExecState* exec, JSValue argument)
 141 {
 142     if (argument.isSymbol())
 143         return jsNontrivialString(exec, asSymbol(argument)->descriptiveString());
 144     return argument.toString(exec);
 145 }
 146
 147 static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState* exec)
 148 {
 149     if (!exec->argumentCount())
 150         return JSValue::encode(jsEmptyString(exec));
 151     return JSValue::encode(stringConstructor(exec, exec->uncheckedArgument(0)));
 152 }
 153
 154 CallType StringConstructor::getCallData(JSCell*, CallData& callData)
 155 {
 156     callData.native.function = callStringConstructor;
 157     return CallTypeHost;
 158 }
 159
 160 } // namespace JSC