tor-browser

HTMLOptionsCollection.cpp (6195B)

---

/* -*- 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/HTMLOptionsCollection.h"

#include "mozilla/dom/HTMLOptionElement.h"
#include "mozilla/dom/HTMLOptionsCollectionBinding.h"
#include "mozilla/dom/HTMLSelectElement.h"

namespace mozilla::dom {

HTMLOptionsCollection::HTMLOptionsCollection(HTMLSelectElement* aSelect)
   : mSelect(aSelect) {}

nsresult HTMLOptionsCollection::GetOptionIndex(Element* aOption,
                                              int32_t aStartIndex,
                                              bool aForward, int32_t* aIndex) {
 // NOTE: aIndex shouldn't be set if the returned value isn't NS_OK.

 int32_t index;

 // Make the common case fast
 if (aStartIndex == 0 && aForward) {
   index = mElements.IndexOf(aOption);
   if (index == -1) {
     return NS_ERROR_FAILURE;
   }

   *aIndex = index;
   return NS_OK;
 }

 int32_t high = mElements.Length();
 int32_t step = aForward ? 1 : -1;

 for (index = aStartIndex; index < high && index > -1; index += step) {
   if (mElements[index] == aOption) {
     *aIndex = index;
     return NS_OK;
   }
 }

 return NS_ERROR_FAILURE;
}

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(HTMLOptionsCollection, mElements, mSelect)

// nsISupports

// QueryInterface implementation for HTMLOptionsCollection
NS_INTERFACE_TABLE_HEAD(HTMLOptionsCollection)
 NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
 NS_INTERFACE_TABLE(HTMLOptionsCollection, nsIHTMLCollection)
 NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(HTMLOptionsCollection)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(HTMLOptionsCollection)
NS_IMPL_CYCLE_COLLECTING_RELEASE(HTMLOptionsCollection)

JSObject* HTMLOptionsCollection::WrapObject(JSContext* aCx,
                                           JS::Handle<JSObject*> aGivenProto) {
 return HTMLOptionsCollection_Binding::Wrap(aCx, this, aGivenProto);
}

uint32_t HTMLOptionsCollection::Length() { return mElements.Length(); }

void HTMLOptionsCollection::SetLength(uint32_t aLength, ErrorResult& aError) {
 mSelect->SetLength(aLength, aError);
}

void HTMLOptionsCollection::IndexedSetter(uint32_t aIndex,
                                         HTMLOptionElement* aOption,
                                         ErrorResult& aError) {
 // if the new option is null, just remove this option.  Note that it's safe
 // to pass a too-large aIndex in here.
 if (!aOption) {
   mSelect->Remove(aIndex);

   // We're done.
   return;
 }

 // Now we're going to be setting an option in our collection
 if (aIndex > mElements.Length()) {
   // Fill our array with blank options up to (but not including, since we're
   // about to change it) aIndex, for compat with other browsers.
   SetLength(aIndex, aError);
   if (NS_WARN_IF(aError.Failed())) {
     return;
   }
 }

 NS_ASSERTION(aIndex <= mElements.Length(), "SetLength lied");

 if (aIndex == mElements.Length()) {
   mSelect->AppendChild(*aOption, aError);
   return;
 }

 // Find the option they're talking about and replace it
 // hold a strong reference to follow COM rules.
 RefPtr<HTMLOptionElement> refChild = ItemAsOption(aIndex);
 if (!refChild) {
   aError.Throw(NS_ERROR_UNEXPECTED);
   return;
 }

 nsCOMPtr<nsINode> parent = refChild->GetParent();
 if (!parent) {
   return;
 }

 parent->ReplaceChild(*aOption, *refChild, aError);
}

int32_t HTMLOptionsCollection::SelectedIndex() {
 return mSelect->SelectedIndex();
}

void HTMLOptionsCollection::SetSelectedIndex(int32_t aSelectedIndex) {
 mSelect->SetSelectedIndex(aSelectedIndex);
}

Element* HTMLOptionsCollection::GetElementAt(uint32_t aIndex) {
 return ItemAsOption(aIndex);
}

HTMLOptionElement* HTMLOptionsCollection::NamedGetter(const nsAString& aName,
                                                     bool& aFound) {
 if (aName.IsEmpty()) {
   aFound = false;
   return nullptr;
 }
 uint32_t count = mElements.Length();
 for (uint32_t i = 0; i < count; i++) {
   HTMLOptionElement* content = mElements.ElementAt(i);
   if (content && (content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
                                        aName, eCaseMatters) ||
                   content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::id,
                                        aName, eCaseMatters))) {
     aFound = true;
     return content;
   }
 }

 aFound = false;
 return nullptr;
}

nsINode* HTMLOptionsCollection::GetParentObject() { return mSelect; }

DocGroup* HTMLOptionsCollection::GetDocGroup() const {
 return mSelect ? mSelect->GetDocGroup() : nullptr;
}

void HTMLOptionsCollection::GetSupportedNames(nsTArray<nsString>& aNames) {
 AutoTArray<nsAtom*, 8> atoms;
 for (uint32_t i = 0; i < mElements.Length(); ++i) {
   HTMLOptionElement* content = mElements.ElementAt(i);
   if (content) {
     // Note: HasName means the names is exposed on the document,
     // which is false for options, so we don't check it here.
     const nsAttrValue* val = content->GetParsedAttr(nsGkAtoms::name);
     if (val && val->Type() == nsAttrValue::eAtom) {
       nsAtom* name = val->GetAtomValue();
       if (!atoms.Contains(name)) {
         atoms.AppendElement(name);
       }
     }
     if (content->HasID()) {
       nsAtom* id = content->GetID();
       if (!atoms.Contains(id)) {
         atoms.AppendElement(id);
       }
     }
   }
 }

 uint32_t atomsLen = atoms.Length();
 nsString* names = aNames.AppendElements(atomsLen);
 for (uint32_t i = 0; i < atomsLen; ++i) {
   atoms[i]->ToString(names[i]);
 }
}

void HTMLOptionsCollection::Add(const HTMLOptionOrOptGroupElement& aElement,
                               const Nullable<HTMLElementOrLong>& aBefore,
                               ErrorResult& aError) {
 mSelect->Add(aElement, aBefore, aError);
}

void HTMLOptionsCollection::Remove(int32_t aIndex) { mSelect->Remove(aIndex); }

}  // namespace mozilla::dom