static_binding.cpp

/* This file is part of the KDE libraries
    Copyright (C) 2005, 2006 Ian Reinhart Geiser <[email protected]>
    Copyright (C) 2005, 2006 Matt Broadstone <[email protected]>
    Copyright (C) 2005, 2006 Richard J. Moore <[email protected]>
    Copyright (C) 2005, 2006 Erik L. Bunce <[email protected]>
 
    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.
*/
#include "static_binding.h"
#include <kjs/interpreter.h>
#include <kjs/function_object.h>
#include <QDebug>
 
namespace KJSEmbed
{
static QHash<QString, const Constructor *> g_ctorHash;
}
 
using namespace KJSEmbed;
 
StaticBinding::StaticBinding(KJS::ExecState *exec, const Method *method)
    : KJS::InternalFunctionImp(static_cast<KJS::FunctionPrototype *>(exec->lexicalInterpreter()->builtinFunctionPrototype()),
                               method->name),
    m_method(method)
{
    putDirect(exec->propertyNames().length, m_method->argc, LengthFlags);
}
 
KJS::JSValue *StaticBinding::callAsFunction(KJS::ExecState *exec, KJS::JSObject *self, const KJS::List &args)
{
    if (m_method->call == nullptr) {
        //throwError(exec, "Bad method id");      // NOTE: fix
        KJS::throwError(exec, KJS::GeneralError, "Bad method id");
        return KJS::jsNull();
    }
 
    KJS::JSValue *retValue = (*m_method->call)(exec, self, args);
 
    if (exec->hadException()) {
        return KJS::jsNull();
    }
    return retValue;
 
}
 
void StaticBinding::publish(KJS::ExecState *exec, KJS::JSObject *object, const Method *methods)
{
    int idx = 0;
    while (methods[idx].name != nullptr) {
        object->put(exec, methods[idx].name, new StaticBinding(exec,  &methods[idx]), methods[idx].flags);
        idx++;
    }
}
 
StaticConstructor::StaticConstructor(KJS::ExecState *exec, const Constructor *constructor)
    : KJS::InternalFunctionImp(static_cast<KJS::FunctionPrototype *>(exec->lexicalInterpreter()->builtinFunctionPrototype()),
                               constructor->name),
    m_constructor(constructor)
{
    putDirect(exec->propertyNames().length, m_constructor->argc, LengthFlags);
    m_default = KJS::jsNull();
}
 
KJS::JSObject *StaticConstructor::construct(KJS::ExecState *exec, const KJS::List &args)
{
    return (*m_constructor->construct)(exec, args);
}
 
void StaticConstructor::setDefaultValue(KJS::JSValue *value)
{
    m_default = value;
}
 
KJS::JSValue *StaticConstructor::defaultValue(KJS::ExecState *exec, KJS::JSType hint) const
{
    Q_UNUSED(exec);
    Q_UNUSED(hint);
    return m_default;
}
 
KJS::JSObject *StaticConstructor::add(KJS::ExecState *exec, KJS::JSObject *object, const Constructor *constructor)
{
    KJS::JSObject *obj = new StaticConstructor(exec,  constructor);
    object->put(exec, constructor->name, obj);
    if (constructor->staticMethods) {
        StaticBinding::publish(exec, obj, constructor->staticMethods);
    }
    /* crashes for some reason */
    if (constructor->enumerators) {
        int idx = 0;
        while (constructor->enumerators[idx].name != nullptr) {
            obj->put(exec, constructor->enumerators[idx].name,
                     KJS::jsNumber(constructor->enumerators[idx].value), KJS::DontDelete | KJS::ReadOnly);
            idx++;
        }
    }
    // publish methods
    KJSEmbed::g_ctorHash[constructor->name] = constructor;
    return obj;
}
 
const Method *StaticConstructor::methods(const KJS::UString &className)
{
    return KJSEmbed::g_ctorHash[toQString(className)]->methods;
}
 
const Constructor *StaticConstructor::constructor(const KJS::UString &className)
{
    return KJSEmbed::g_ctorHash[toQString(className)];
}
 
KJS::JSObject *StaticConstructor::bind(KJS::ExecState *exec, const QString &className, PointerBase &objPtr)
{
    KJSEmbed::callBind mybind = KJSEmbed::g_ctorHash[className]->bind;
//    qDebug() << "StaticConstructor::bind() className=" << className  << " mybind=" << mybind;
    if (mybind) {
        return (*mybind)(exec, objPtr);
    }
 
    return nullptr;
}
 
KJS::JSObject *StaticConstructor::construct(KJS::ExecState *exec, KJS::JSObject *parent, const KJS::UString &className, const KJS::List &args)
{
//    qDebug("StaticConstructor::construct('%s')", className.ascii() );
    if (parent->hasProperty(exec, className.ascii())) {
        KJS::JSObject *ctor = parent->get(exec, className.ascii())->toObject(exec);
        if (ctor) {
            return ctor->construct(exec, args);
        }
    }
    qDebug("cannot create '%s'", className.ascii());
    return KJS::throwError(exec, KJS::TypeError, toUString(QString("Cannot create %1 objects from javascript.").arg(toQString(className))));
}