1 /*
2 * Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
3 * Copyright (C) 2001 Peter Kelly (pmk@post.com)
4 * Copyright (C) 2004, 2007, 2008 Apple Inc. All rights reserved.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB. If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 *
21 */
22
23 #include "config.h"
24 #include "JSString.h"
25
26 #include "JSGlobalObject.h"
27 #include "JSObject.h"
28 #include "StringObject.h"
29 #include "StringPrototype.h"
30
31 namespace JSC {
32
toPrimitive(ExecState *,PreferredPrimitiveType) const33 JSValuePtr JSString::toPrimitive(ExecState*, PreferredPrimitiveType) const
34 {
35 return const_cast<JSString*>(this);
36 }
37
getPrimitiveNumber(ExecState *,double & number,JSValuePtr & value)38 bool JSString::getPrimitiveNumber(ExecState*, double& number, JSValuePtr& value)
39 {
40 value = this;
41 number = m_value.toDouble();
42 return false;
43 }
44
toBoolean(ExecState *) const45 bool JSString::toBoolean(ExecState*) const
46 {
47 return !m_value.isEmpty();
48 }
49
toNumber(ExecState *) const50 double JSString::toNumber(ExecState*) const
51 {
52 return m_value.toDouble();
53 }
54
toString(ExecState *) const55 UString JSString::toString(ExecState*) const
56 {
57 return m_value;
58 }
59
toThisString(ExecState *) const60 UString JSString::toThisString(ExecState*) const
61 {
62 return m_value;
63 }
64
toThisJSString(ExecState *)65 JSString* JSString::toThisJSString(ExecState*)
66 {
67 return this;
68 }
69
create(ExecState * exec,JSString * string)70 inline StringObject* StringObject::create(ExecState* exec, JSString* string)
71 {
72 return new (exec) StringObject(exec->lexicalGlobalObject()->stringObjectStructure(), string);
73 }
74
toObject(ExecState * exec) const75 JSObject* JSString::toObject(ExecState* exec) const
76 {
77 return StringObject::create(exec, const_cast<JSString*>(this));
78 }
79
toThisObject(ExecState * exec) const80 JSObject* JSString::toThisObject(ExecState* exec) const
81 {
82 return StringObject::create(exec, const_cast<JSString*>(this));
83 }
84
getOwnPropertySlot(ExecState * exec,const Identifier & propertyName,PropertySlot & slot)85 bool JSString::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
86 {
87 // The semantics here are really getPropertySlot, not getOwnPropertySlot.
88 // This function should only be called by JSValue::get.
89 if (getStringPropertySlot(exec, propertyName, slot))
90 return true;
91 slot.setBase(this);
92 JSObject* object;
93 for (JSValuePtr prototype = exec->lexicalGlobalObject()->stringPrototype(); !prototype.isNull(); prototype = object->prototype()) {
94 object = asObject(prototype);
95 if (object->getOwnPropertySlot(exec, propertyName, slot))
96 return true;
97 }
98 slot.setUndefined();
99 return true;
100 }
101
getOwnPropertySlot(ExecState * exec,unsigned propertyName,PropertySlot & slot)102 bool JSString::getOwnPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
103 {
104 // The semantics here are really getPropertySlot, not getOwnPropertySlot.
105 // This function should only be called by JSValue::get.
106 if (getStringPropertySlot(exec, propertyName, slot))
107 return true;
108 return JSString::getOwnPropertySlot(exec, Identifier::from(exec, propertyName), slot);
109 }
110
jsString(JSGlobalData * globalData,const UString & s)111 JSString* jsString(JSGlobalData* globalData, const UString& s)
112 {
113 int size = s.size();
114 if (!size)
115 return globalData->smallStrings.emptyString(globalData);
116 if (size == 1) {
117 UChar c = s.data()[0];
118 if (c <= 0xFF)
119 return globalData->smallStrings.singleCharacterString(globalData, c);
120 }
121 return new (globalData) JSString(globalData, s);
122 }
123
jsSubstring(JSGlobalData * globalData,const UString & s,unsigned offset,unsigned length)124 JSString* jsSubstring(JSGlobalData* globalData, const UString& s, unsigned offset, unsigned length)
125 {
126 ASSERT(offset <= static_cast<unsigned>(s.size()));
127 ASSERT(length <= static_cast<unsigned>(s.size()));
128 ASSERT(offset + length <= static_cast<unsigned>(s.size()));
129 if (!length)
130 return globalData->smallStrings.emptyString(globalData);
131 if (length == 1) {
132 UChar c = s.data()[offset];
133 if (c <= 0xFF)
134 return globalData->smallStrings.singleCharacterString(globalData, c);
135 }
136 return new (globalData) JSString(globalData, UString::Rep::create(s.rep(), offset, length));
137 }
138
jsOwnedString(JSGlobalData * globalData,const UString & s)139 JSString* jsOwnedString(JSGlobalData* globalData, const UString& s)
140 {
141 int size = s.size();
142 if (!size)
143 return globalData->smallStrings.emptyString(globalData);
144 if (size == 1) {
145 UChar c = s.data()[0];
146 if (c <= 0xFF)
147 return globalData->smallStrings.singleCharacterString(globalData, c);
148 }
149 return new (globalData) JSString(globalData, s, JSString::HasOtherOwner);
150 }
151
152 } // namespace JSC
153