root/Source/bindings/v8/V8NPUtils.cpp

DEFINITIONS

1. convertV8ObjectToNPVariant
2. convertNPVariantToV8Object
3. getStringIdentifier
4. pushExceptionHandler
5. popExceptionHandler

/*
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 * modification, are permitted provided that the following conditions are
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 *
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "bindings/v8/V8NPUtils.h"

#include "bindings/v8/NPV8Object.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8NPObject.h"
#include "bindings/v8/npruntime_impl.h"
#include "bindings/v8/npruntime_priv.h"
#include "core/frame/DOMWindow.h"
#include "wtf/text/WTFString.h"

#include <stdlib.h>

namespace WebCore {

void convertV8ObjectToNPVariant(v8::Local<v8::Value> object, NPObject* owner, NPVariant* result, v8::Isolate* isolate)
{
    VOID_TO_NPVARIANT(*result);

    // It is really the caller's responsibility to deal with the empty handle case because there could be different actions to
    // take in different contexts.
    ASSERT(!object.IsEmpty());

    if (object.IsEmpty())
        return;

    if (object->IsNumber())
        DOUBLE_TO_NPVARIANT(object->NumberValue(), *result);
    else if (object->IsBoolean())
        BOOLEAN_TO_NPVARIANT(object->BooleanValue(), *result);
    else if (object->IsNull())
        NULL_TO_NPVARIANT(*result);
    else if (object->IsUndefined())
        VOID_TO_NPVARIANT(*result);
    else if (object->IsString()) {
        v8::Handle<v8::String> str = object.As<v8::String>();
        int length = str->Utf8Length() + 1;
        char* utf8Chars = reinterpret_cast<char*>(malloc(length));
        str->WriteUtf8(utf8Chars, length, 0, v8::String::HINT_MANY_WRITES_EXPECTED);
        STRINGN_TO_NPVARIANT(utf8Chars, length-1, *result);
    } else if (object->IsObject()) {
        DOMWindow* window = currentDOMWindow(isolate);
        NPObject* npobject = npCreateV8ScriptObject(0, v8::Handle<v8::Object>::Cast(object), window, isolate);
        if (npobject)
            _NPN_RegisterObject(npobject, owner);
        OBJECT_TO_NPVARIANT(npobject, *result);
    }
}

v8::Handle<v8::Value> convertNPVariantToV8Object(const NPVariant* variant, NPObject* owner, v8::Isolate* isolate)
{
    NPVariantType type = variant->type;

    switch (type) {
    case NPVariantType_Int32:
        return v8::Integer::New(isolate, NPVARIANT_TO_INT32(*variant));
    case NPVariantType_Double:
        return v8::Number::New(isolate, NPVARIANT_TO_DOUBLE(*variant));
    case NPVariantType_Bool:
        return v8Boolean(NPVARIANT_TO_BOOLEAN(*variant), isolate);
    case NPVariantType_Null:
        return v8::Null(isolate);
    case NPVariantType_Void:
        return v8::Undefined(isolate);
    case NPVariantType_String: {
        NPString src = NPVARIANT_TO_STRING(*variant);
        return v8::String::NewFromUtf8(isolate, src.UTF8Characters, v8::String::kNormalString, src.UTF8Length);
    }
    case NPVariantType_Object: {
        NPObject* object = NPVARIANT_TO_OBJECT(*variant);
        if (V8NPObject* v8Object = npObjectToV8NPObject(object))
            return v8::Local<v8::Object>::New(isolate, v8Object->v8Object);
        return createV8ObjectForNPObject(object, owner, isolate);
    }
    default:
        return v8::Undefined(isolate);
    }
}

// Helper function to create an NPN String Identifier from a v8 string.
NPIdentifier getStringIdentifier(v8::Handle<v8::String> str)
{
    const int kStackBufferSize = 100;

    int bufferLength = str->Utf8Length() + 1;
    if (bufferLength <= kStackBufferSize) {
        // Use local stack buffer to avoid heap allocations for small strings. Here we should only use the stack space for
        // stackBuffer when it's used, not when we use the heap.
        //
        // WriteUtf8 is guaranteed to generate a null-terminated string because bufferLength is constructed to be one greater
        // than the string length.
        char stackBuffer[kStackBufferSize];
        str->WriteUtf8(stackBuffer, bufferLength);
        return _NPN_GetStringIdentifier(stackBuffer);
    }

    v8::String::Utf8Value utf8(str);
    return _NPN_GetStringIdentifier(*utf8);
}

struct ExceptionHandlerInfo {
    ExceptionHandlerInfo* previous;
    ExceptionHandler handler;
    void* data;
};

static ExceptionHandlerInfo* topHandler;

void pushExceptionHandler(ExceptionHandler handler, void* data)
{
    ExceptionHandlerInfo* info = new ExceptionHandlerInfo;
    info->previous = topHandler;
    info->handler = handler;
    info->data = data;
    topHandler = info;
}

void popExceptionHandler()
{
    ASSERT(topHandler);
    ExceptionHandlerInfo* doomed = topHandler;
    topHandler = topHandler->previous;
    delete doomed;
}

ExceptionCatcher::ExceptionCatcher()
{
    if (!topHandler)
        m_tryCatch.SetVerbose(true);
}

ExceptionCatcher::~ExceptionCatcher()
{
    if (!m_tryCatch.HasCaught())
        return;

    if (topHandler)
        topHandler->handler(topHandler->data, *v8::String::Utf8Value(m_tryCatch.Exception()));
}

} // namespace WebCore