third_party/WebKit/Source/bindings/core/v8/ScriptEventListener.cpp

/*
 * Copyright (C) 2009 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * 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
 * "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 THE COPYRIGHT
 * OWNER 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "bindings/core/v8/ScriptEventListener.h"

#include "bindings/core/v8/ScheduledAction.h"
#include "bindings/core/v8/ScriptController.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/SourceLocation.h"
#include "bindings/core/v8/V8AbstractEventListener.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/WindowProxy.h"
#include "core/dom/Document.h"
#include "core/dom/DocumentParser.h"
#include "core/dom/QualifiedName.h"
#include "core/events/EventListener.h"
#include "core/frame/LocalFrame.h"
#include "v8/include/v8.h"

namespace blink {

V8LazyEventListener* createAttributeEventListener(
    Node* node,
    const QualifiedName& name,
    const AtomicString& value,
    const AtomicString& eventParameterName) {
  ASSERT(node);
  if (value.isNull())
    return nullptr;

  // FIXME: Very strange: we initialize zero-based number with '1'.
  TextPosition position(OrdinalNumber::fromZeroBasedInt(1),
                        OrdinalNumber::first());
  String sourceURL;

  v8::Isolate* isolate = toIsolate(&node->document());
  if (LocalFrame* frame = node->document().frame()) {
    ScriptController& scriptController = frame->script();
    if (!node->document().canExecuteScripts(AboutToExecuteScript))
      return nullptr;
    position = scriptController.eventHandlerPosition();
    sourceURL = node->document().url().getString();
  }

  return V8LazyEventListener::create(name.localName(), eventParameterName,
                                     value, sourceURL, position, node, isolate);
}

V8LazyEventListener* createAttributeEventListener(
    LocalFrame* frame,
    const QualifiedName& name,
    const AtomicString& value,
    const AtomicString& eventParameterName) {
  if (!frame)
    return nullptr;

  if (value.isNull())
    return nullptr;

  if (!frame->document()->canExecuteScripts(AboutToExecuteScript))
    return nullptr;

  TextPosition position = frame->script().eventHandlerPosition();
  String sourceURL = frame->document()->url().getString();

  return V8LazyEventListener::create(name.localName(), eventParameterName,
                                     value, sourceURL, position, 0,
                                     toIsolate(frame));
}

v8::Local<v8::Object> eventListenerHandler(ExecutionContext* executionContext,
                                           EventListener* listener) {
  if (listener->type() != EventListener::JSEventListenerType)
    return v8::Local<v8::Object>();
  V8AbstractEventListener* v8Listener =
      static_cast<V8AbstractEventListener*>(listener);
  return v8Listener->getListenerObject(executionContext);
}

v8::Local<v8::Function> eventListenerEffectiveFunction(
    v8::Isolate* isolate,
    v8::Local<v8::Object> handler) {
  v8::Local<v8::Function> function;
  if (handler->IsFunction()) {
    function = handler.As<v8::Function>();
  } else if (handler->IsObject()) {
    v8::Local<v8::Value> property;
    // Try the "handleEvent" method (EventListener interface).
    if (handler
            ->Get(handler->CreationContext(),
                  v8AtomicString(isolate, "handleEvent"))
            .ToLocal(&property) &&
        property->IsFunction())
      function = property.As<v8::Function>();
    // Fall back to the "constructor" property.
    else if (handler
                 ->Get(handler->CreationContext(),
                       v8AtomicString(isolate, "constructor"))
                 .ToLocal(&property) &&
             property->IsFunction())
      function = property.As<v8::Function>();
  }
  if (!function.IsEmpty())
    return getBoundFunction(function);
  return v8::Local<v8::Function>();
}

void getFunctionLocation(v8::Local<v8::Function> function,
                         String& scriptId,
                         int& lineNumber,
                         int& columnNumber) {
  int scriptIdValue = function->ScriptId();
  scriptId = String::number(scriptIdValue);
  lineNumber = function->GetScriptLineNumber();
  columnNumber = function->GetScriptColumnNumber();
}

std::unique_ptr<SourceLocation> getFunctionLocation(
    ExecutionContext* executionContext,
    EventListener* listener) {
  v8::Isolate* isolate = toIsolate(executionContext);
  v8::HandleScope handleScope(isolate);
  v8::Local<v8::Object> handler =
      eventListenerHandler(executionContext, listener);
  if (handler.IsEmpty())
    return nullptr;
  return SourceLocation::fromFunction(
      eventListenerEffectiveFunction(isolate, handler));
}

}  // namespace blink