dom/html/HTMLFormControlsCollection.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 19 May 2017 17:49:41 +0900
changeset 407399 b75c111837a802ceb953dba50a3c5a193d53ca22
parent 404371 041312e3df86ae2de69805c7c40ce9ed101f55d2
child 416428 6a629adbb62a299d7208373d1c6f375149d2afdb
permissions -rw-r--r--
Bug 1339543 part 4 Change nsIWidget::ExecuteNativeKeyBinding() to nsIWidget::GetEditCommands() which just retrieves edit commands for the type r=smaug Now, nsIWidget::ExecuteNativeKeyBinding() isn't used by anybody for executing edit commands. Instead, they need array of edit commands for the key combination. So, the method should be renamed to GetEditCommands() and just return edit commands as an array. MozReview-Commit-ID: 4G0B1lJ8Lbe

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/HTMLFormControlsCollection.h"

#include "mozilla/FlushType.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLFormControlsCollectionBinding.h"
#include "mozilla/dom/HTMLFormElement.h"
#include "nsGenericHTMLElement.h" // nsGenericHTMLFormElement
#include "nsIDocument.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIFormControl.h"
#include "RadioNodeList.h"
#include "jsfriendapi.h"

namespace mozilla {
namespace dom {

/* static */ bool
HTMLFormControlsCollection::ShouldBeInElements(nsIFormControl* aFormControl)
{
  // For backwards compatibility (with 4.x and IE) we must not add
  // <input type=image> elements to the list of form controls in a
  // form.

  switch (aFormControl->ControlType()) {
  case NS_FORM_BUTTON_BUTTON :
  case NS_FORM_BUTTON_RESET :
  case NS_FORM_BUTTON_SUBMIT :
  case NS_FORM_INPUT_BUTTON :
  case NS_FORM_INPUT_CHECKBOX :
  case NS_FORM_INPUT_COLOR :
  case NS_FORM_INPUT_EMAIL :
  case NS_FORM_INPUT_FILE :
  case NS_FORM_INPUT_HIDDEN :
  case NS_FORM_INPUT_RESET :
  case NS_FORM_INPUT_PASSWORD :
  case NS_FORM_INPUT_RADIO :
  case NS_FORM_INPUT_SEARCH :
  case NS_FORM_INPUT_SUBMIT :
  case NS_FORM_INPUT_TEXT :
  case NS_FORM_INPUT_TEL :
  case NS_FORM_INPUT_URL :
  case NS_FORM_INPUT_NUMBER :
  case NS_FORM_INPUT_RANGE :
  case NS_FORM_INPUT_DATE :
  case NS_FORM_INPUT_TIME :
  case NS_FORM_INPUT_MONTH :
  case NS_FORM_INPUT_WEEK :
  case NS_FORM_INPUT_DATETIME_LOCAL :
  case NS_FORM_SELECT :
  case NS_FORM_TEXTAREA :
  case NS_FORM_FIELDSET :
  case NS_FORM_OBJECT :
  case NS_FORM_OUTPUT :
    return true;
  }

  // These form control types are not supposed to end up in the
  // form.elements array
  //
  // NS_FORM_INPUT_IMAGE
  //
  // XXXbz maybe we should just check for that type here instead of the big
  // switch?

  return false;
}

HTMLFormControlsCollection::HTMLFormControlsCollection(HTMLFormElement* aForm)
  : mForm(aForm)
  // Initialize the elements list to have an initial capacity
  // of 8 to reduce allocations on small forms.
  , mElements(8)
  , mNameLookupTable(HTMLFormElement::FORM_CONTROL_LIST_HASHTABLE_LENGTH)
{
}

HTMLFormControlsCollection::~HTMLFormControlsCollection()
{
  mForm = nullptr;
  Clear();
}

void
HTMLFormControlsCollection::DropFormReference()
{
  mForm = nullptr;
  Clear();
}

void
HTMLFormControlsCollection::Clear()
{
  // Null out childrens' pointer to me.  No refcounting here
  for (int32_t i = mElements.Length() - 1; i >= 0; i--) {
    mElements[i]->ClearForm(false, false);
  }
  mElements.Clear();

  for (int32_t i = mNotInElements.Length() - 1; i >= 0; i--) {
    mNotInElements[i]->ClearForm(false, false);
  }
  mNotInElements.Clear();

  mNameLookupTable.Clear();
}

void
HTMLFormControlsCollection::FlushPendingNotifications()
{
  if (mForm) {
    nsIDocument* doc = mForm->GetUncomposedDoc();
    if (doc) {
      doc->FlushPendingNotifications(FlushType::Content);
    }
  }
}

NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLFormControlsCollection)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(HTMLFormControlsCollection)
  // Note: We intentionally don't set tmp->mForm to nullptr here, since doing
  // so may result in crashes because of inconsistent null-checking after the
  // object gets unlinked.
  tmp->Clear();
  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(HTMLFormControlsCollection)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNameLookupTable)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(HTMLFormControlsCollection)
  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END

// XPConnect interface list for HTMLFormControlsCollection
NS_INTERFACE_TABLE_HEAD(HTMLFormControlsCollection)
  NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
  NS_INTERFACE_TABLE(HTMLFormControlsCollection,
                     nsIHTMLCollection,
                     nsIDOMHTMLCollection)
  NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(HTMLFormControlsCollection)
NS_INTERFACE_MAP_END


NS_IMPL_CYCLE_COLLECTING_ADDREF(HTMLFormControlsCollection)
NS_IMPL_CYCLE_COLLECTING_RELEASE(HTMLFormControlsCollection)


// nsIDOMHTMLCollection interface

NS_IMETHODIMP
HTMLFormControlsCollection::GetLength(uint32_t* aLength)
{
  FlushPendingNotifications();
  *aLength = mElements.Length();
  return NS_OK;
}

NS_IMETHODIMP
HTMLFormControlsCollection::Item(uint32_t aIndex, nsIDOMNode** aReturn)
{
  nsISupports* item = GetElementAt(aIndex);
  if (!item) {
    *aReturn = nullptr;

    return NS_OK;
  }

  return CallQueryInterface(item, aReturn);
}

NS_IMETHODIMP 
HTMLFormControlsCollection::NamedItem(const nsAString& aName,
                                      nsIDOMNode** aReturn)
{
  FlushPendingNotifications();

  *aReturn = nullptr;

  nsCOMPtr<nsISupports> supports;

  if (!mNameLookupTable.Get(aName, getter_AddRefs(supports))) {
    // key not found
    return NS_OK;
  }

  if (!supports) {
    return NS_OK;
  }

  // We found something, check if it's a node
  CallQueryInterface(supports, aReturn);
  if (*aReturn) {
    return NS_OK;
  }

  // If not, we check if it's a node list.
  nsCOMPtr<nsIDOMNodeList> nodeList = do_QueryInterface(supports);
  NS_ASSERTION(nodeList, "Huh, what's going one here?");
  if (!nodeList) {
    return NS_OK;
  }

  // And since we're only asking for one node here, we return the first
  // one from the list.
  return nodeList->Item(0, aReturn);
}

nsISupports*
HTMLFormControlsCollection::NamedItemInternal(const nsAString& aName,
                                              bool aFlushContent)
{
  if (aFlushContent) {
    FlushPendingNotifications();
  }

  return mNameLookupTable.GetWeak(aName);
}

nsresult
HTMLFormControlsCollection::AddElementToTable(nsGenericHTMLFormElement* aChild,
                                              const nsAString& aName)
{
  if (!ShouldBeInElements(aChild)) {
    return NS_OK;
  }

  return mForm->AddElementToTableInternal(mNameLookupTable, aChild, aName);
}

nsresult
HTMLFormControlsCollection::IndexOfControl(nsIFormControl* aControl,
                                           int32_t* aIndex)
{
  // Note -- not a DOM method; callers should handle flushing themselves
  
  NS_ENSURE_ARG_POINTER(aIndex);

  *aIndex = mElements.IndexOf(aControl);

  return NS_OK;
}

nsresult
HTMLFormControlsCollection::RemoveElementFromTable(
  nsGenericHTMLFormElement* aChild, const nsAString& aName)
{
  if (!ShouldBeInElements(aChild)) {
    return NS_OK;
  }

  return mForm->RemoveElementFromTableInternal(mNameLookupTable, aChild, aName);
}

nsresult
HTMLFormControlsCollection::GetSortedControls(
  nsTArray<nsGenericHTMLFormElement*>& aControls) const
{
#ifdef DEBUG
  HTMLFormElement::AssertDocumentOrder(mElements, mForm);
  HTMLFormElement::AssertDocumentOrder(mNotInElements, mForm);
#endif

  aControls.Clear();

  // Merge the elements list and the not in elements list. Both lists are
  // already sorted.
  uint32_t elementsLen = mElements.Length();
  uint32_t notInElementsLen = mNotInElements.Length();
  aControls.SetCapacity(elementsLen + notInElementsLen);

  uint32_t elementsIdx = 0;
  uint32_t notInElementsIdx = 0;

  while (elementsIdx < elementsLen || notInElementsIdx < notInElementsLen) {
    // Check whether we're done with mElements
    if (elementsIdx == elementsLen) {
      NS_ASSERTION(notInElementsIdx < notInElementsLen,
                   "Should have remaining not-in-elements");
      // Append the remaining mNotInElements elements
      if (!aControls.AppendElements(mNotInElements.Elements() +
                                      notInElementsIdx,
                                    notInElementsLen -
                                      notInElementsIdx)) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      break;
    }
    // Check whether we're done with mNotInElements
    if (notInElementsIdx == notInElementsLen) {
      NS_ASSERTION(elementsIdx < elementsLen,
                   "Should have remaining in-elements");
      // Append the remaining mElements elements
      if (!aControls.AppendElements(mElements.Elements() +
                                      elementsIdx,
                                    elementsLen -
                                      elementsIdx)) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      break;
    }
    // Both lists have elements left.
    NS_ASSERTION(mElements[elementsIdx] &&
                 mNotInElements[notInElementsIdx],
                 "Should have remaining elements");
    // Determine which of the two elements should be ordered
    // first and add it to the end of the list.
    nsGenericHTMLFormElement* elementToAdd;
    if (HTMLFormElement::CompareFormControlPosition(
          mElements[elementsIdx], mNotInElements[notInElementsIdx], mForm) < 0) {
      elementToAdd = mElements[elementsIdx];
      ++elementsIdx;
    } else {
      elementToAdd = mNotInElements[notInElementsIdx];
      ++notInElementsIdx;
    }
    // Add the first element to the list.
    if (!aControls.AppendElement(elementToAdd)) {
      return NS_ERROR_OUT_OF_MEMORY;
    }
  }

  NS_ASSERTION(aControls.Length() == elementsLen + notInElementsLen,
               "Not all form controls were added to the sorted list");
#ifdef DEBUG
  HTMLFormElement::AssertDocumentOrder(aControls, mForm);
#endif

  return NS_OK;
}

Element*
HTMLFormControlsCollection::GetElementAt(uint32_t aIndex)
{
  FlushPendingNotifications();

  return mElements.SafeElementAt(aIndex, nullptr);
}

/* virtual */ nsINode*
HTMLFormControlsCollection::GetParentObject()
{
  return mForm;
}

/* virtual */ Element*
HTMLFormControlsCollection::GetFirstNamedElement(const nsAString& aName, bool& aFound)
{
  Nullable<OwningRadioNodeListOrElement> maybeResult;
  NamedGetter(aName, aFound, maybeResult);
  if (!aFound) {
    return nullptr;
  }
  MOZ_ASSERT(!maybeResult.IsNull());
  const OwningRadioNodeListOrElement& result = maybeResult.Value();
  if (result.IsElement()) {
    return result.GetAsElement().get();
  }
  if (result.IsRadioNodeList()) {
    RadioNodeList& nodelist = result.GetAsRadioNodeList();
    return nodelist.Item(0)->AsElement();
  }
  MOZ_ASSERT_UNREACHABLE("Should only have Elements and NodeLists here.");
  return nullptr;
}

void
HTMLFormControlsCollection::NamedGetter(const nsAString& aName,
                                        bool& aFound,
                                        Nullable<OwningRadioNodeListOrElement>& aResult)
{
  nsISupports* item = NamedItemInternal(aName, true);
  if (!item) {
    aFound = false;
    return;
  }
  aFound = true;
  if (nsCOMPtr<Element> element = do_QueryInterface(item)) {
    aResult.SetValue().SetAsElement() = element;
    return;
  }
  if (nsCOMPtr<RadioNodeList> nodelist = do_QueryInterface(item)) {
    aResult.SetValue().SetAsRadioNodeList() = nodelist;
    return;
  }
  MOZ_ASSERT_UNREACHABLE("Should only have Elements and NodeLists here.");
}

void
HTMLFormControlsCollection::GetSupportedNames(nsTArray<nsString>& aNames)
{
  FlushPendingNotifications();
  // Just enumerate mNameLookupTable.  This won't guarantee order, but
  // that's OK, because the HTML5 spec doesn't define an order for
  // this enumeration.
  for (auto iter = mNameLookupTable.Iter(); !iter.Done(); iter.Next()) {
    aNames.AppendElement(iter.Key());
  }
}

/* virtual */ JSObject*
HTMLFormControlsCollection::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return HTMLFormControlsCollectionBinding::Wrap(aCx, this, aGivenProto);
}

} // namespace dom
} // namespace mozilla