SSL nsDOMTokenList.cpp Interaktion und
PortierbarkeitC

/* -*- 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/. */

/*
* Implementation of DOMTokenList specified by HTML5.
*/

#include "nsDOMTokenList.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "nsTHashMap.h"
#include "nsError.h"
#include "nsHashKeys.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/DOMTokenListBinding.h"
#include "mozilla/ErrorResult.h"

using namespace mozilla;
using namespace mozilla::dom;

nsDOMTokenList::nsDOMTokenList(
    Element* aElement, nsAtom* aAttrAtom,
    const DOMTokenListSupportedTokenArray aSupportedTokens)
    : mElement(aElement),
      mAttrAtom(aAttrAtom),
      mSupportedTokens(aSupportedTokens) {
  // We don't add a reference to our element. If it goes away,
  // we'll be told to drop our reference
}

nsDOMTokenList::~nsDOMTokenList() = default;

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsDOMTokenList, mElement)

NS_INTERFACE_MAP_BEGIN(nsDOMTokenList)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMTokenList)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMTokenList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMTokenList)

const nsAttrValue* nsDOMTokenList::GetParsedAttr() {
  if (!mElement) {
    return nullptr;
  }
  return mElement->GetAttrInfo(kNameSpaceID_None, mAttrAtom).mValue;
}

static void RemoveDuplicates(const nsAttrValue* aAttr) {
  if (!aAttr || aAttr->Type() != nsAttrValue::eAtomArray) {
    return;
  }
  const_cast<nsAttrValue*>(aAttr)->RemoveDuplicatesFromAtomArray();
}

uint32_t nsDOMTokenList::Length() {
  const nsAttrValue* attr = GetParsedAttr();
  if (!attr) {
    return 0;
  }

  RemoveDuplicates(attr);
  return attr->GetAtomCount();
}

void nsDOMTokenList::IndexedGetter(uint32_t aIndex, bool& aFound,
                                   nsAString& aResult) {
  const nsAttrValue* attr = GetParsedAttr();

  if (!attr || aIndex >= static_cast<uint32_t>(attr->GetAtomCount())) {
    aFound = false;
    return;
  }

  RemoveDuplicates(attr);

  if (attr && aIndex < static_cast<uint32_t>(attr->GetAtomCount())) {
    aFound = true;
    attr->AtomAt(aIndex)->ToString(aResult);
  } else {
    aFound = false;
  }
}

void nsDOMTokenList::GetValue(nsAString& aResult) {
  if (!mElement) {
    aResult.Truncate();
    return;
  }

  mElement->GetAttr(mAttrAtom, aResult);
}

void nsDOMTokenList::SetValue(const nsAString& aValue, ErrorResult& rv) {
  if (!mElement) {
    return;
  }

  rv = mElement->SetAttr(kNameSpaceID_None, mAttrAtom, aValue, true);
}

void nsDOMTokenList::CheckToken(const nsAString& aToken, ErrorResult& aRv) {
  if (aToken.IsEmpty()) {
    return aRv.ThrowSyntaxError("The empty string is not a valid token.");
  }

  nsAString::const_iterator iter, end;
  aToken.BeginReading(iter);
  aToken.EndReading(end);

  while (iter != end) {
    if (nsContentUtils::IsHTMLWhitespace(*iter)) {
      return aRv.ThrowInvalidCharacterError(
          "The token can not contain whitespace.");
    }
    ++iter;
  }
}

void nsDOMTokenList::CheckTokens(const nsTArray<nsString>& aTokens,
                                 ErrorResult& aRv) {
  for (uint32_t i = 0, l = aTokens.Length(); i < l; ++i) {
    CheckToken(aTokens[i], aRv);
    if (aRv.Failed()) {
      return;
    }
  }
}

bool nsDOMTokenList::Contains(const nsAString& aToken) {
  const nsAttrValue* attr = GetParsedAttr();
  return attr && attr->Contains(aToken);
}

void nsDOMTokenList::AddInternal(const nsAttrValue* aAttr,
                                 const nsTArray<nsString>& aTokens) {
  if (!mElement) {
    return;
  }

  nsAutoString resultStr;

  if (aAttr) {
    RemoveDuplicates(aAttr);
    for (uint32_t i = 0; i < aAttr->GetAtomCount(); i++) {
      if (i != 0) {
        resultStr.AppendLiteral(" ");
      }
      resultStr.Append(nsDependentAtomString(aAttr->AtomAt(i)));
    }
  }

  AutoTArray<nsString, 10> addedClasses;

  for (uint32_t i = 0, l = aTokens.Length(); i < l; ++i) {
    const nsString& aToken = aTokens[i];

    if ((aAttr && aAttr->Contains(aToken)) || addedClasses.Contains(aToken)) {
      continue;
    }

    if (!resultStr.IsEmpty()) {
      resultStr.Append(' ');
    }
    resultStr.Append(aToken);

    addedClasses.AppendElement(aToken);
  }

  mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
}

void nsDOMTokenList::Add(const nsTArray<nsString>& aTokens,
                         ErrorResult& aError) {
  CheckTokens(aTokens, aError);
  if (aError.Failed()) {
    return;
  }

  const nsAttrValue* attr = GetParsedAttr();
  AddInternal(attr, aTokens);
}

void nsDOMTokenList::Add(const nsAString& aToken, ErrorResult& aError) {
  AutoTArray<nsString, 1> tokens;
  tokens.AppendElement(aToken);
  Add(tokens, aError);
}

void nsDOMTokenList::RemoveInternal(const nsAttrValue* aAttr,
                                    const nsTArray<nsString>& aTokens) {
  MOZ_ASSERT(aAttr, "Need an attribute");

  RemoveDuplicates(aAttr);

  nsAutoString resultStr;
  for (uint32_t i = 0; i < aAttr->GetAtomCount(); i++) {
    if (aTokens.Contains(nsDependentAtomString(aAttr->AtomAt(i)))) {
      continue;
    }
    if (!resultStr.IsEmpty()) {
      resultStr.AppendLiteral(" ");
    }
    resultStr.Append(nsDependentAtomString(aAttr->AtomAt(i)));
  }

  mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
}

void nsDOMTokenList::Remove(const nsTArray<nsString>& aTokens,
                            ErrorResult& aError) {
  CheckTokens(aTokens, aError);
  if (aError.Failed()) {
    return;
  }

  const nsAttrValue* attr = GetParsedAttr();
  if (!attr) {
    return;
  }

  RemoveInternal(attr, aTokens);
}

void nsDOMTokenList::Remove(const nsAString& aToken, ErrorResult& aError) {
  AutoTArray<nsString, 1> tokens;
  tokens.AppendElement(aToken);
  Remove(tokens, aError);
}

bool nsDOMTokenList::Toggle(const nsAString& aToken,
                            const Optional<bool>& aForce, ErrorResult& aError) {
  CheckToken(aToken, aError);
  if (aError.Failed()) {
    return false;
  }

  const nsAttrValue* attr = GetParsedAttr();
  const bool forceOn = aForce.WasPassed() && aForce.Value();
  const bool forceOff = aForce.WasPassed() && !aForce.Value();

  bool isPresent = attr && attr->Contains(aToken);
  AutoTArray<nsString, 1> tokens;
  (*tokens.AppendElement()).Rebind(aToken.Data(), aToken.Length());

  if (isPresent) {
    if (!forceOn) {
      RemoveInternal(attr, tokens);
      isPresent = false;
    }
  } else {
    if (!forceOff) {
      AddInternal(attr, tokens);
      isPresent = true;
    }
  }

  return isPresent;
}

bool nsDOMTokenList::Replace(const nsAString& aToken,
                             const nsAString& aNewToken, ErrorResult& aError) {
  // Doing this here instead of using `CheckToken` because if aToken had invalid
  // characters, and aNewToken is empty, the returned error should be a
  // SyntaxError, not an InvalidCharacterError.
  if (aNewToken.IsEmpty()) {
    aError.ThrowSyntaxError("The empty string is not a valid token.");
    return false;
  }

  CheckToken(aToken, aError);
  if (aError.Failed()) {
    return false;
  }

  CheckToken(aNewToken, aError);
  if (aError.Failed()) {
    return false;
  }

  const nsAttrValue* attr = GetParsedAttr();
  if (!attr) {
    return false;
  }

  return ReplaceInternal(attr, aToken, aNewToken);
}

bool nsDOMTokenList::ReplaceInternal(const nsAttrValue* aAttr,
                                     const nsAString& aToken,
                                     const nsAString& aNewToken) {
  RemoveDuplicates(aAttr);

  // Trying to do a single pass here leads to really complicated code.  Just do
  // the simple thing.
  bool haveOld = false;
  for (uint32_t i = 0; i < aAttr->GetAtomCount(); ++i) {
    if (aAttr->AtomAt(i)->Equals(aToken)) {
      haveOld = true;
      break;
    }
  }
  if (!haveOld) {
    // Make sure to not touch the attribute value in this case.
    return false;
  }

  bool sawIt = false;
  nsAutoString resultStr;
  for (uint32_t i = 0; i < aAttr->GetAtomCount(); i++) {
    if (aAttr->AtomAt(i)->Equals(aToken) ||
        aAttr->AtomAt(i)->Equals(aNewToken)) {
      if (sawIt) {
        // We keep only the first
        continue;
      }
      sawIt = true;
      if (!resultStr.IsEmpty()) {
        resultStr.AppendLiteral(" ");
      }
      resultStr.Append(aNewToken);
      continue;
    }
    if (!resultStr.IsEmpty()) {
      resultStr.AppendLiteral(" ");
    }
    resultStr.Append(nsDependentAtomString(aAttr->AtomAt(i)));
  }

  MOZ_ASSERT(sawIt, "How could we not have found our token this time?");
  mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
  return true;
}

bool nsDOMTokenList::Supports(const nsAString& aToken, ErrorResult& aError) {
  if (!mSupportedTokens) {
    aError.ThrowTypeError<MSG_TOKENLIST_NO_SUPPORTED_TOKENS>(
        NS_ConvertUTF16toUTF8(mElement->LocalName()),
        NS_ConvertUTF16toUTF8(nsDependentAtomString(mAttrAtom)));
    return false;
  }

  for (DOMTokenListSupportedToken* supportedToken = mSupportedTokens;
       *supportedToken; ++supportedToken) {
    if (aToken.LowerCaseEqualsASCII(*supportedToken)) {
      return true;
    }
  }

  return false;
}

DocGroup* nsDOMTokenList::GetDocGroup() const {
  return mElement ? mElement->OwnerDoc()->GetDocGroup() : nullptr;
}

JSObject* nsDOMTokenList::WrapObject(JSContext* cx,
                                     JS::Handle<JSObject*> aGivenProto) {
  return DOMTokenList_Binding::Wrap(cx, this, aGivenProto);
}

quality91%

¤ Diese beiden folgenden Angebotsgruppen bietet das Unternehmen0.17Angebot Wie Sie bei der Firma Beratungs- und Dienstleistungen beauftragen können ¤

*Eine klare Vorstellung vom Zielzustand

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.

SSL nsDOMTokenList.cpp Interaktion und PortierbarkeitC

¤ Diese beiden folgenden Angebotsgruppen bietet das Unternehmen0.17Angebot Wie Sie bei der Firma Beratungs- und Dienstleistungen beauftragen können ¤

Haftungshinweis

Bemerkung:

SSL nsDOMTokenList.cpp Interaktion und
PortierbarkeitC