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Diffstat (limited to 'Source/JavaScriptCore/qt/api/qscriptoriginalglobalobject_p.h')
| -rw-r--r-- | Source/JavaScriptCore/qt/api/qscriptoriginalglobalobject_p.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/qt/api/qscriptoriginalglobalobject_p.h b/Source/JavaScriptCore/qt/api/qscriptoriginalglobalobject_p.h new file mode 100644 index 0000000..2bd945f --- /dev/null +++ b/Source/JavaScriptCore/qt/api/qscriptoriginalglobalobject_p.h @@ -0,0 +1,209 @@ +/* + Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public License + along with this library; see the file COPYING.LIB. If not, write to + the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. +*/ + +#ifndef qscriptoriginalglobalobject_p_h +#define qscriptoriginalglobalobject_p_h + +#include <JavaScriptCore/JavaScript.h> +#include <JavaScriptCore/JSRetainPtr.h> +#include <QtCore/qvector.h> + +/*! + \internal + This class is a workaround for missing JSC C API functionality. This class keeps all important + properties of an original (default) global object, so we can use it even if the global object was + changed. + + FIXME this class is a container for workarounds :-) it should be replaced by proper JSC C API calls. + + The class have to be created on the QScriptEnginePrivate creation time (before any change got applied to + global object). +*/ +class QScriptOriginalGlobalObject { +public: + inline QScriptOriginalGlobalObject(JSGlobalContextRef context); + inline ~QScriptOriginalGlobalObject(); + + inline bool objectHasOwnProperty(JSObjectRef object, JSStringRef property) const; + inline QVector<JSStringRef> objectGetOwnPropertyNames(JSObjectRef object) const; + + inline bool isDate(JSValueRef value) const; + inline bool isArray(JSValueRef value) const; + inline bool isError(JSValueRef value) const; + + inline JSValueRef functionPrototype() const; +private: + inline bool isType(JSValueRef value, JSObjectRef constructor, JSValueRef prototype) const; + inline void initializeMember(JSObjectRef globalObject, JSStringRef prototypeName, const char* type, JSObjectRef& constructor, JSValueRef& prototype); + + // Copy of the global context reference (the same as in QScriptEnginePrivate). + JSGlobalContextRef m_context; + + // Copy of constructors and prototypes used in isType functions. + JSObjectRef m_arrayConstructor; + JSValueRef m_arrayPrototype; + JSObjectRef m_errorConstructor; + JSValueRef m_errorPrototype; + JSObjectRef m_functionConstructor; + JSValueRef m_functionPrototype; + JSObjectRef m_dateConstructor; + JSValueRef m_datePrototype; + + // Reference to standard JS functions that are not exposed by JSC C API. + JSObjectRef m_hasOwnPropertyFunction; + JSObjectRef m_getOwnPropertyNamesFunction; +}; + +QScriptOriginalGlobalObject::QScriptOriginalGlobalObject(JSGlobalContextRef context) + : m_context(JSGlobalContextRetain(context)) +{ + JSObjectRef globalObject = JSContextGetGlobalObject(m_context); + JSValueRef exception = 0; + JSRetainPtr<JSStringRef> propertyName; + + propertyName.adopt(JSStringCreateWithUTF8CString("prototype")); + initializeMember(globalObject, propertyName.get(), "Array", m_arrayConstructor, m_arrayPrototype); + initializeMember(globalObject, propertyName.get(), "Error", m_errorConstructor, m_errorPrototype); + initializeMember(globalObject, propertyName.get(), "Function", m_functionConstructor, m_functionPrototype); + initializeMember(globalObject, propertyName.get(), "Date", m_dateConstructor, m_datePrototype); + + propertyName.adopt(JSStringCreateWithUTF8CString("hasOwnProperty")); + m_hasOwnPropertyFunction = const_cast<JSObjectRef>(JSObjectGetProperty(m_context, globalObject, propertyName.get(), &exception)); + JSValueProtect(m_context, m_hasOwnPropertyFunction); + Q_ASSERT(JSValueIsObject(m_context, m_hasOwnPropertyFunction)); + Q_ASSERT(JSObjectIsFunction(m_context, m_hasOwnPropertyFunction)); + Q_ASSERT(!exception); + + propertyName.adopt(JSStringCreateWithUTF8CString("Object")); + JSObjectRef objectConstructor + = const_cast<JSObjectRef>(JSObjectGetProperty(m_context, globalObject, propertyName.get(), &exception)); + propertyName.adopt(JSStringCreateWithUTF8CString("getOwnPropertyNames")); + m_getOwnPropertyNamesFunction + = const_cast<JSObjectRef>(JSObjectGetProperty(m_context, objectConstructor, propertyName.get(), &exception)); + JSValueProtect(m_context, m_getOwnPropertyNamesFunction); + Q_ASSERT(JSValueIsObject(m_context, m_getOwnPropertyNamesFunction)); + Q_ASSERT(JSObjectIsFunction(m_context, m_getOwnPropertyNamesFunction)); + Q_ASSERT(!exception); +} + +inline void QScriptOriginalGlobalObject::initializeMember(JSObjectRef globalObject, JSStringRef prototypeName, const char* type, JSObjectRef& constructor, JSValueRef& prototype) +{ + JSRetainPtr<JSStringRef> typeName(Adopt, JSStringCreateWithUTF8CString(type)); + JSValueRef exception = 0; + + // Save references to the Type constructor and prototype. + JSValueRef typeConstructor = JSObjectGetProperty(m_context, globalObject, typeName.get(), &exception); + Q_ASSERT(JSValueIsObject(m_context, typeConstructor)); + constructor = JSValueToObject(m_context, typeConstructor, &exception); + JSValueProtect(m_context, constructor); + + // Note that this is not the [[Prototype]] internal property (which we could + // get via JSObjectGetPrototype), but the Type.prototype, that will be set + // as [[Prototype]] of Type instances. + prototype = JSObjectGetProperty(m_context, constructor, prototypeName, &exception); + Q_ASSERT(JSValueIsObject(m_context, prototype)); + JSValueProtect(m_context, prototype); + Q_ASSERT(!exception); +} + +QScriptOriginalGlobalObject::~QScriptOriginalGlobalObject() +{ + JSValueUnprotect(m_context, m_arrayConstructor); + JSValueUnprotect(m_context, m_arrayPrototype); + JSValueUnprotect(m_context, m_errorConstructor); + JSValueUnprotect(m_context, m_errorPrototype); + JSValueUnprotect(m_context, m_functionConstructor); + JSValueUnprotect(m_context, m_functionPrototype); + JSValueUnprotect(m_context, m_dateConstructor); + JSValueUnprotect(m_context, m_datePrototype); + JSValueUnprotect(m_context, m_hasOwnPropertyFunction); + JSValueUnprotect(m_context, m_getOwnPropertyNamesFunction); + JSGlobalContextRelease(m_context); +} + +inline bool QScriptOriginalGlobalObject::objectHasOwnProperty(JSObjectRef object, JSStringRef property) const +{ + // FIXME This function should be replaced by JSC C API. + JSValueRef exception = 0; + JSValueRef propertyName[] = { JSValueMakeString(m_context, property) }; + JSValueRef result = JSObjectCallAsFunction(m_context, m_hasOwnPropertyFunction, object, 1, propertyName, &exception); + return exception ? false : JSValueToBoolean(m_context, result); +} + +/*! + \internal + This method gives ownership of all JSStringRefs. +*/ +inline QVector<JSStringRef> QScriptOriginalGlobalObject::objectGetOwnPropertyNames(JSObjectRef object) const +{ + JSValueRef exception = 0; + JSObjectRef propertyNames + = const_cast<JSObjectRef>(JSObjectCallAsFunction(m_context, + m_getOwnPropertyNamesFunction, + /* thisObject */ 0, + /* argumentCount */ 1, + &object, + &exception)); + Q_ASSERT(JSValueIsObject(m_context, propertyNames)); + Q_ASSERT(!exception); + JSStringRef lengthName = QScriptConverter::toString("length"); + int count = JSValueToNumber(m_context, JSObjectGetProperty(m_context, propertyNames, lengthName, &exception), &exception); + + Q_ASSERT(!exception); + QVector<JSStringRef> names; + names.reserve(count); + for (int i = 0; i < count; ++i) { + JSValueRef tmp = JSObjectGetPropertyAtIndex(m_context, propertyNames, i, &exception); + names.append(JSValueToStringCopy(m_context, tmp, &exception)); + Q_ASSERT(!exception); + } + return names; +} + +inline bool QScriptOriginalGlobalObject::isDate(JSValueRef value) const +{ + return isType(value, m_dateConstructor, m_datePrototype); +} + +inline bool QScriptOriginalGlobalObject::isArray(JSValueRef value) const +{ + return isType(value, m_arrayConstructor, m_arrayPrototype); +} + +inline bool QScriptOriginalGlobalObject::isError(JSValueRef value) const +{ + return isType(value, m_errorConstructor, m_errorPrototype); +} + +inline JSValueRef QScriptOriginalGlobalObject::functionPrototype() const +{ + return m_functionPrototype; +} + +inline bool QScriptOriginalGlobalObject::isType(JSValueRef value, JSObjectRef constructor, JSValueRef prototype) const +{ + // JSC API doesn't export the [[Class]] information for the builtins. But we know that a value + // is an object of the Type if it was created with the Type constructor or if it is the Type.prototype. + JSValueRef exception = 0; + bool result = JSValueIsInstanceOfConstructor(m_context, value, constructor, &exception) || JSValueIsStrictEqual(m_context, value, prototype); + Q_ASSERT(!exception); + return result; +} + +#endif // qscriptoriginalglobalobject_p_h |