root/Source/bindings/v8/V8NodeFilterCondition.cpp

DEFINITIONS

1. m_filter
2. acceptNode
3. setWeakCallback

/*
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#include "config.h"
#include "bindings/v8/V8NodeFilterCondition.h"

#include "V8Node.h"
#include "bindings/v8/ScriptController.h"
#include "bindings/v8/V8HiddenValue.h"
#include "core/dom/Node.h"
#include "core/dom/NodeFilter.h"
#include "wtf/OwnPtr.h"

namespace WebCore {

V8NodeFilterCondition::V8NodeFilterCondition(v8::Handle<v8::Value> filter, v8::Handle<v8::Object> owner, v8::Isolate* isolate)
    : m_scriptState(NewScriptState::current(isolate))
    , m_filter(isolate, filter)
{
    V8HiddenValue::setHiddenValue(isolate, owner, V8HiddenValue::condition(isolate), filter);
    m_filter.setWeak(this, &setWeakCallback);
}

V8NodeFilterCondition::~V8NodeFilterCondition()
{
}

short V8NodeFilterCondition::acceptNode(Node* node, ExceptionState& exceptionState) const
{
    v8::Isolate* isolate = m_scriptState->isolate();
    ASSERT(!m_scriptState->context().IsEmpty());
    v8::HandleScope handleScope(isolate);
    v8::Handle<v8::Value> filter = m_filter.newLocal(isolate);
    ASSERT(!filter.IsEmpty());
    // FIXME: Remove the filter.IsEmpty() check because |filter| must not be empty.
    // See crbug.com/358858 for more details.
    if (filter.IsEmpty() || !filter->IsObject())
        return NodeFilter::FILTER_ACCEPT;

    v8::TryCatch exceptionCatcher;

    v8::Handle<v8::Function> callback;
    if (filter->IsFunction())
        callback = v8::Handle<v8::Function>::Cast(filter);
    else {
        v8::Local<v8::Value> value = filter->ToObject()->Get(v8AtomicString(isolate, "acceptNode"));
        if (value.IsEmpty() || !value->IsFunction()) {
            throwTypeError("NodeFilter object does not have an acceptNode function", isolate);
            return NodeFilter::FILTER_REJECT;
        }
        callback = v8::Handle<v8::Function>::Cast(value);
    }

    OwnPtr<v8::Handle<v8::Value>[]> info = adoptArrayPtr(new v8::Handle<v8::Value>[1]);
    info[0] = toV8(node, v8::Handle<v8::Object>(), isolate);

    v8::Handle<v8::Object> object = m_scriptState->context()->Global();
    v8::Handle<v8::Value> result = ScriptController::callFunction(m_scriptState->executionContext(), callback, object, 1, info.get(), isolate);

    if (exceptionCatcher.HasCaught()) {
        exceptionState.rethrowV8Exception(exceptionCatcher.Exception());
        return NodeFilter::FILTER_REJECT;
    }

    ASSERT(!result.IsEmpty());

    return result->Int32Value();
}

void V8NodeFilterCondition::setWeakCallback(const v8::WeakCallbackData<v8::Value, V8NodeFilterCondition>& data)
{
    data.GetParameter()->m_filter.clear();
}

} // namespace WebCore