1 /*
2  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
3  *
4  *  This library is free software; you can redistribute it and/or
5  *  modify it under the terms of the GNU Lesser General Public
6  *  License as published by the Free Software Foundation; either
7  *  version 2 of the License, or (at your option) any later version.
8  *
9  *  This library is distributed in the hope that it will be useful,
10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  *  Lesser General Public License for more details.
13  *
14  *  You should have received a copy of the GNU Lesser General Public
15  *  License along with this library; if not, write to the Free Software
16  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
17  *
18  */
19 
20 #include "config.h"
21 #include "qt_class.h"
22 
23 #include "Identifier.h"
24 #include "qt_instance.h"
25 #include "qt_runtime.h"
26 
27 #include <qdebug.h>
28 #include <qmetaobject.h>
29 
30 namespace JSC {
31 namespace Bindings {
32 
QtClass(const QMetaObject * mo)33 QtClass::QtClass(const QMetaObject* mo)
34     : m_metaObject(mo)
35 {
36 }
37 
~QtClass()38 QtClass::~QtClass()
39 {
40 }
41 
42 typedef HashMap<const QMetaObject*, QtClass*> ClassesByMetaObject;
43 static ClassesByMetaObject* classesByMetaObject = 0;
44 
classForObject(QObject * o)45 QtClass* QtClass::classForObject(QObject* o)
46 {
47     if (!classesByMetaObject)
48         classesByMetaObject = new ClassesByMetaObject;
49 
50     const QMetaObject* mo = o->metaObject();
51     QtClass* aClass = classesByMetaObject->get(mo);
52     if (!aClass) {
53         aClass = new QtClass(mo);
54         classesByMetaObject->set(mo, aClass);
55     }
56 
57     return aClass;
58 }
59 
name() const60 const char* QtClass::name() const
61 {
62     return m_metaObject->className();
63 }
64 
65 // We use this to get at signals (so we can return a proper function object,
66 // and not get wrapped in RuntimeMethod). Also, use this for methods,
67 // so we can cache the object and return the same object for the same
68 // identifier.
fallbackObject(ExecState * exec,Instance * inst,const Identifier & identifier)69 JSValue QtClass::fallbackObject(ExecState* exec, Instance* inst, const Identifier& identifier)
70 {
71     QtInstance* qtinst = static_cast<QtInstance*>(inst);
72 
73     const UString& ustring = identifier.ustring();
74     const QByteArray name = QString(reinterpret_cast<const QChar*>(ustring.characters()), ustring.length()).toAscii();
75 
76     // First see if we have a cache hit
77     JSObject* val = qtinst->m_methods.value(name).get();
78     if (val)
79         return val;
80 
81     // Nope, create an entry
82     const QByteArray normal = QMetaObject::normalizedSignature(name.constData());
83 
84     // See if there is an exact match
85     int index = -1;
86     if (normal.contains('(') && (index = m_metaObject->indexOfMethod(normal)) != -1) {
87         QMetaMethod m = m_metaObject->method(index);
88         if (m.access() != QMetaMethod::Private) {
89             QtRuntimeMetaMethod* val = new (exec) QtRuntimeMetaMethod(exec, identifier, static_cast<QtInstance*>(inst), index, normal, false);
90             qtinst->m_methods.insert(name, WriteBarrier<JSObject>(exec->globalData(), qtinst->createRuntimeObject(exec), val));
91             return val;
92         }
93     }
94 
95     // Nope.. try a basename match
96     const int count = m_metaObject->methodCount();
97     for (index = count - 1; index >= 0; --index) {
98         const QMetaMethod m = m_metaObject->method(index);
99         if (m.access() == QMetaMethod::Private)
100             continue;
101 
102         int iter = 0;
103         const char* signature = m.signature();
104         while (signature[iter] && signature[iter] != '(')
105             ++iter;
106 
107         if (normal == QByteArray::fromRawData(signature, iter)) {
108             QtRuntimeMetaMethod* val = new (exec) QtRuntimeMetaMethod(exec, identifier, static_cast<QtInstance*>(inst), index, normal, false);
109             qtinst->m_methods.insert(name, WriteBarrier<JSObject>(exec->globalData(), qtinst->createRuntimeObject(exec), val));
110             return val;
111         }
112     }
113 
114     return jsUndefined();
115 }
116 
117 // This functionality is handled by the fallback case above...
methodsNamed(const Identifier &,Instance *) const118 MethodList QtClass::methodsNamed(const Identifier&, Instance*) const
119 {
120     return MethodList();
121 }
122 
123 // ### we may end up with a different search order than QtScript by not
124 // folding this code into the fallbackMethod above, but Fields propagate out
125 // of the binding code
fieldNamed(const Identifier & identifier,Instance * instance) const126 Field* QtClass::fieldNamed(const Identifier& identifier, Instance* instance) const
127 {
128     // Check static properties first
129     QtInstance* qtinst = static_cast<QtInstance*>(instance);
130 
131     QObject* obj = qtinst->getObject();
132     const UString& ustring = identifier.ustring();
133     const QString name(reinterpret_cast<const QChar*>(ustring.characters()), ustring.length());
134     const QByteArray ascii = name.toAscii();
135 
136     // First check for a cached field
137     QtField* f = qtinst->m_fields.value(name);
138 
139     if (obj) {
140         if (f) {
141             // We only cache real metaproperties, but we do store the
142             // other types so we can delete them later
143             if (f->fieldType() == QtField::MetaProperty)
144                 return f;
145 #ifndef QT_NO_PROPERTIES
146             if (f->fieldType() == QtField::DynamicProperty) {
147                 if (obj->dynamicPropertyNames().indexOf(ascii) >= 0)
148                     return f;
149                 // Dynamic property that disappeared
150                 qtinst->m_fields.remove(name);
151                 delete f;
152             }
153 #endif
154             else {
155                 const QList<QObject*>& children = obj->children();
156                 const int count = children.size();
157                 for (int index = 0; index < count; ++index) {
158                     QObject* child = children.at(index);
159                     if (child->objectName() == name)
160                         return f;
161                 }
162 
163                 // Didn't find it, delete it from the cache
164                 qtinst->m_fields.remove(name);
165                 delete f;
166             }
167         }
168 
169         int index = m_metaObject->indexOfProperty(ascii);
170         if (index >= 0) {
171             const QMetaProperty prop = m_metaObject->property(index);
172 
173             if (prop.isScriptable(obj)) {
174                 f = new QtField(prop);
175                 qtinst->m_fields.insert(name, f);
176                 return f;
177             }
178         }
179 
180 #ifndef QT_NO_PROPERTIES
181         // Dynamic properties
182         index = obj->dynamicPropertyNames().indexOf(ascii);
183         if (index >= 0) {
184             f = new QtField(ascii);
185             qtinst->m_fields.insert(name, f);
186             return f;
187         }
188 #endif
189 
190         // Child objects
191 
192         const QList<QObject*>& children = obj->children();
193         const int count = children.count();
194         for (index = 0; index < count; ++index) {
195             QObject* child = children.at(index);
196             if (child->objectName() == name) {
197                 f = new QtField(child);
198                 qtinst->m_fields.insert(name, f);
199                 return f;
200             }
201         }
202 
203         // Nothing named this
204         return 0;
205     }
206     // For compatibility with qtscript, cached methods don't cause
207     // errors until they are accessed, so don't blindly create an error
208     // here.
209     if (qtinst->m_methods.contains(ascii))
210         return 0;
211 
212 #ifndef QT_NO_PROPERTIES
213     // deleted qobject, but can't throw an error from here (no exec)
214     // create a fake QtField that will throw upon access
215     if (!f) {
216         f = new QtField(ascii);
217         qtinst->m_fields.insert(name, f);
218     }
219 #endif
220     return f;
221 }
222 
223 }
224 }
225 
226