/*
* Copyright (C) 2004, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "objc_class.h"
#include "objc_instance.h"
#include "WebScriptObject.h"
namespace JSC {
namespace Bindings {
ObjcClass::ObjcClass(ClassStructPtr aClass)
: _isa(aClass)
{
}
static CFMutableDictionaryRef classesByIsA = 0;
static void _createClassesByIsAIfNecessary()
{
if (!classesByIsA)
classesByIsA = CFDictionaryCreateMutable(NULL, 0, NULL, NULL);
}
ObjcClass* ObjcClass::classForIsA(ClassStructPtr isa)
{
_createClassesByIsAIfNecessary();
ObjcClass* aClass = (ObjcClass*)CFDictionaryGetValue(classesByIsA, isa);
if (!aClass) {
aClass = new ObjcClass(isa);
CFDictionaryAddValue(classesByIsA, isa, aClass);
}
return aClass;
}
/*
By default, a JavaScript method name is produced by concatenating the
components of an ObjectiveC method name, replacing ':' with '_', and
escaping '_' and '$' with a leading '$', such that '_' becomes "$_" and
'$' becomes "$$". For example:
ObjectiveC name Default JavaScript name
moveTo:: moveTo__
moveTo_ moveTo$_
moveTo$_ moveTo$$$_
This function performs the inverse of that operation.
@result Fills 'buffer' with the ObjectiveC method name that corresponds to 'JSName'.
*/
typedef Vector<char, 256> JSNameConversionBuffer;
static inline void convertJSMethodNameToObjc(const CString& jsName, JSNameConversionBuffer& buffer)
{
buffer.reserveInitialCapacity(jsName.length() + 1);
const char* source = jsName.data();
while (true) {
if (*source == '$') {
++source;
buffer.uncheckedAppend(*source);
} else if (*source == '_')
buffer.uncheckedAppend(':');
else
buffer.uncheckedAppend(*source);
if (!*source)
return;
++source;
}
}
MethodList ObjcClass::methodsNamed(const Identifier& identifier, Instance*) const
{
MethodList methodList;
if (Method* method = m_methodCache.get(identifier.impl())) {
methodList.append(method);
return methodList;
}
CString jsName = identifier.ascii();
JSNameConversionBuffer buffer;
convertJSMethodNameToObjc(jsName, buffer);
RetainPtr<CFStringRef> methodName(AdoptCF, CFStringCreateWithCString(NULL, buffer.data(), kCFStringEncodingASCII));
ClassStructPtr thisClass = _isa;
while (thisClass && methodList.isEmpty()) {
unsigned numMethodsInClass = 0;
MethodStructPtr* objcMethodList = class_copyMethodList(thisClass, &numMethodsInClass);
for (unsigned i = 0; i < numMethodsInClass; i++) {
MethodStructPtr objcMethod = objcMethodList[i];
SEL objcMethodSelector = method_getName(objcMethod);
const char* objcMethodSelectorName = sel_getName(objcMethodSelector);
NSString* mappedName = nil;
// See if the class wants to exclude the selector from visibility in JavaScript.
if ([thisClass respondsToSelector:@selector(isSelectorExcludedFromWebScript:)])
if ([thisClass isSelectorExcludedFromWebScript:objcMethodSelector])
continue;
// See if the class want to provide a different name for the selector in JavaScript.
// Note that we do not do any checks to guarantee uniqueness. That's the responsiblity
// of the class.
if ([thisClass respondsToSelector:@selector(webScriptNameForSelector:)])
mappedName = [thisClass webScriptNameForSelector:objcMethodSelector];
if ((mappedName && [mappedName isEqual:(NSString*)methodName.get()]) || strcmp(objcMethodSelectorName, buffer.data()) == 0) {
OwnPtr<Method> method = adoptPtr(new ObjcMethod(thisClass, objcMethodSelector));
methodList.append(method.get());
m_methodCache.add(identifier.impl(), method.release());
break;
}
}
thisClass = class_getSuperclass(thisClass);
free(objcMethodList);
}
return methodList;
}
Field* ObjcClass::fieldNamed(const Identifier& identifier, Instance* instance) const
{
Field* field = m_fieldCache.get(identifier.impl());
if (field)
return field;
ClassStructPtr thisClass = _isa;
CString jsName = identifier.ascii();
RetainPtr<CFStringRef> fieldName(AdoptCF, CFStringCreateWithCString(NULL, jsName.data(), kCFStringEncodingASCII));
id targetObject = (static_cast<ObjcInstance*>(instance))->getObject();
id attributes = [targetObject attributeKeys];
if (attributes) {
// Class overrides attributeKeys, use that array of key names.
unsigned count = [attributes count];
for (unsigned i = 0; i < count; i++) {
NSString* keyName = [attributes objectAtIndex:i];
const char* UTF8KeyName = [keyName UTF8String]; // ObjC actually only supports ASCII names.
// See if the class wants to exclude the selector from visibility in JavaScript.
if ([thisClass respondsToSelector:@selector(isKeyExcludedFromWebScript:)])
if ([thisClass isKeyExcludedFromWebScript:UTF8KeyName])
continue;
// See if the class want to provide a different name for the selector in JavaScript.
// Note that we do not do any checks to guarantee uniqueness. That's the responsiblity
// of the class.
NSString* mappedName = nil;
if ([thisClass respondsToSelector:@selector(webScriptNameForKey:)])
mappedName = [thisClass webScriptNameForKey:UTF8KeyName];
if ((mappedName && [mappedName isEqual:(NSString*)fieldName.get()]) || [keyName isEqual:(NSString*)fieldName.get()]) {
OwnPtr<Field> newField = adoptPtr(new ObjcField((CFStringRef)keyName));
field = newField.get();
m_fieldCache.add(identifier.impl(), newField.release());
break;
}
}
} else {
// Class doesn't override attributeKeys, so fall back on class runtime
// introspection.
while (thisClass) {
unsigned numFieldsInClass = 0;
IvarStructPtr* ivarsInClass = class_copyIvarList(thisClass, &numFieldsInClass);
for (unsigned i = 0; i < numFieldsInClass; i++) {
IvarStructPtr objcIVar = ivarsInClass[i];
const char* objcIvarName = ivar_getName(objcIVar);
NSString* mappedName = 0;
// See if the class wants to exclude the selector from visibility in JavaScript.
if ([thisClass respondsToSelector:@selector(isKeyExcludedFromWebScript:)])
if ([thisClass isKeyExcludedFromWebScript:objcIvarName])
continue;
// See if the class want to provide a different name for the selector in JavaScript.
// Note that we do not do any checks to guarantee uniqueness. That's the responsiblity
// of the class.
if ([thisClass respondsToSelector:@selector(webScriptNameForKey:)])
mappedName = [thisClass webScriptNameForKey:objcIvarName];
if ((mappedName && [mappedName isEqual:(NSString*)fieldName.get()]) || strcmp(objcIvarName, jsName.data()) == 0) {
OwnPtr<Field> newField = adoptPtr(new ObjcField(objcIVar));
field = newField.get();
m_fieldCache.add(identifier.impl(), newField.release());
break;
}
}
thisClass = class_getSuperclass(thisClass);
free(ivarsInClass);
}
}
return field;
}
JSValue ObjcClass::fallbackObject(ExecState* exec, Instance* instance, const Identifier &propertyName)
{
ObjcInstance* objcInstance = static_cast<ObjcInstance*>(instance);
id targetObject = objcInstance->getObject();
if (![targetObject respondsToSelector:@selector(invokeUndefinedMethodFromWebScript:withArguments:)])
return jsUndefined();
return ObjcFallbackObjectImp::create(exec, exec->lexicalGlobalObject(), objcInstance, propertyName);
}
}
}