1/*
2 * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
3 * Copyright (C) 2004-2008, 2016 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 "StringObject.h"
23
24#include "Error.h"
25#include "JSGlobalObject.h"
26#include "JSCInlines.h"
27#include "PropertyNameArray.h"
28
29namespace JSC {
30
31STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(StringObject);
32
33const ClassInfo StringObject::s_info = { "String", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(StringObject) };
34
35StringObject::StringObject(VM& vm, Structure* structure)
36 : Base(vm, structure)
37{
38}
39
40void StringObject::finishCreation(VM& vm, JSString* string)
41{
42 Base::finishCreation(vm);
43 ASSERT(inherits(vm, info()));
44 setInternalValue(vm, string);
45}
46
47bool StringObject::getOwnPropertySlot(JSObject* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
48{
49 StringObject* thisObject = jsCast<StringObject*>(cell);
50 if (thisObject->internalValue()->getStringPropertySlot(exec, propertyName, slot))
51 return true;
52 return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
53}
54
55bool StringObject::getOwnPropertySlotByIndex(JSObject* object, ExecState* exec, unsigned propertyName, PropertySlot& slot)
56{
57 StringObject* thisObject = jsCast<StringObject*>(object);
58 if (thisObject->internalValue()->getStringPropertySlot(exec, propertyName, slot))
59 return true;
60 return JSObject::getOwnPropertySlot(thisObject, exec, Identifier::from(exec, propertyName), slot);
61}
62
63bool StringObject::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
64{
65 VM& vm = exec->vm();
66 auto scope = DECLARE_THROW_SCOPE(vm);
67
68 StringObject* thisObject = jsCast<StringObject*>(cell);
69
70 if (UNLIKELY(isThisValueAltered(slot, thisObject)))
71 RELEASE_AND_RETURN(scope, ordinarySetSlow(exec, thisObject, propertyName, value, slot.thisValue(), slot.isStrictMode()));
72
73 if (propertyName == vm.propertyNames->length)
74 return typeError(exec, scope, slot.isStrictMode(), ReadonlyPropertyWriteError);
75 if (Optional<uint32_t> index = parseIndex(propertyName))
76 RELEASE_AND_RETURN(scope, putByIndex(cell, exec, index.value(), value, slot.isStrictMode()));
77 RELEASE_AND_RETURN(scope, JSObject::put(cell, exec, propertyName, value, slot));
78}
79
80bool StringObject::putByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
81{
82 VM& vm = exec->vm();
83 auto scope = DECLARE_THROW_SCOPE(vm);
84
85 StringObject* thisObject = jsCast<StringObject*>(cell);
86 if (thisObject->internalValue()->canGetIndex(propertyName))
87 return typeError(exec, scope, shouldThrow, ReadonlyPropertyWriteError);
88 RELEASE_AND_RETURN(scope, JSObject::putByIndex(cell, exec, propertyName, value, shouldThrow));
89}
90
91static bool isStringOwnProperty(ExecState* exec, StringObject* object, PropertyName propertyName)
92{
93 VM& vm = exec->vm();
94 if (propertyName == vm.propertyNames->length)
95 return true;
96 if (Optional<uint32_t> index = parseIndex(propertyName)) {
97 if (object->internalValue()->canGetIndex(index.value()))
98 return true;
99 }
100 return false;
101}
102
103bool StringObject::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool throwException)
104{
105 VM& vm = exec->vm();
106 auto scope = DECLARE_THROW_SCOPE(vm);
107 StringObject* thisObject = jsCast<StringObject*>(object);
108
109 if (isStringOwnProperty(exec, thisObject, propertyName)) {
110 // The current PropertyDescriptor is always
111 // PropertyDescriptor{[[Value]]: value, [[Writable]]: false, [[Enumerable]]: true, [[Configurable]]: false}.
112 // This ensures that any property descriptor cannot change the existing one.
113 // Here, simply return the result of validateAndApplyPropertyDescriptor.
114 // https://tc39.github.io/ecma262/#sec-string-exotic-objects-getownproperty-p
115 PropertyDescriptor current;
116 bool isCurrentDefined = thisObject->getOwnPropertyDescriptor(exec, propertyName, current);
117 EXCEPTION_ASSERT(!scope.exception() == isCurrentDefined);
118 RETURN_IF_EXCEPTION(scope, false);
119 bool isExtensible = thisObject->isExtensible(exec);
120 RETURN_IF_EXCEPTION(scope, false);
121 RELEASE_AND_RETURN(scope, validateAndApplyPropertyDescriptor(exec, nullptr, propertyName, isExtensible, descriptor, isCurrentDefined, current, throwException));
122 }
123
124 RELEASE_AND_RETURN(scope, Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException));
125}
126
127bool StringObject::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
128{
129 VM& vm = exec->vm();
130 StringObject* thisObject = jsCast<StringObject*>(cell);
131 if (propertyName == vm.propertyNames->length)
132 return false;
133 Optional<uint32_t> index = parseIndex(propertyName);
134 if (index && thisObject->internalValue()->canGetIndex(index.value()))
135 return false;
136 return JSObject::deleteProperty(thisObject, exec, propertyName);
137}
138
139bool StringObject::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned i)
140{
141 StringObject* thisObject = jsCast<StringObject*>(cell);
142 if (thisObject->internalValue()->canGetIndex(i))
143 return false;
144 return JSObject::deletePropertyByIndex(thisObject, exec, i);
145}
146
147void StringObject::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
148{
149 StringObject* thisObject = jsCast<StringObject*>(object);
150 if (propertyNames.includeStringProperties()) {
151 int size = thisObject->internalValue()->length();
152 for (int i = 0; i < size; ++i)
153 propertyNames.add(Identifier::from(exec, i));
154 }
155 return JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
156}
157
158void StringObject::getOwnNonIndexPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
159{
160 VM& vm = exec->vm();
161 StringObject* thisObject = jsCast<StringObject*>(object);
162 if (mode.includeDontEnumProperties())
163 propertyNames.add(vm.propertyNames->length);
164 return JSObject::getOwnNonIndexPropertyNames(thisObject, exec, propertyNames, mode);
165}
166
167StringObject* constructString(VM& vm, JSGlobalObject* globalObject, JSValue string)
168{
169 StringObject* object = StringObject::create(vm, globalObject->stringObjectStructure());
170 object->setInternalValue(vm, string);
171 return object;
172}
173
174} // namespace JSC
175