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nsDOMTokenList.cpp
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nsDOMTokenList.cpp
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/* 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 "nsContentUtils.h"
#include "nsError.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, nsIAtom* aAttrAtom)
: mElement(aElement),
mAttrAtom(aAttrAtom)
{
// We don't add a reference to our element. If it goes away,
// we'll be told to drop our reference
}
nsDOMTokenList::~nsDOMTokenList() { }
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;
}
uint32_t
nsDOMTokenList::Length()
{
const nsAttrValue* attr = GetParsedAttr();
if (!attr) {
return 0;
}
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 = true;
attr->AtomAt(aIndex)->ToString(aResult);
} else {
aFound = false;
}
}
nsresult
nsDOMTokenList::CheckToken(const nsAString& aStr)
{
if (aStr.IsEmpty()) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
nsAString::const_iterator iter, end;
aStr.BeginReading(iter);
aStr.EndReading(end);
while (iter != end) {
if (nsContentUtils::IsHTMLWhitespace(*iter))
return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
++iter;
}
return NS_OK;
}
nsresult
nsDOMTokenList::CheckTokens(const nsTArray<nsString>& aTokens)
{
for (uint32_t i = 0, l = aTokens.Length(); i < l; ++i) {
nsresult rv = CheckToken(aTokens[i]);
if (NS_FAILED(rv)) {
return rv;
}
}
return NS_OK;
}
bool
nsDOMTokenList::Contains(const nsAString& aToken, ErrorResult& aError)
{
aError = CheckToken(aToken);
if (aError.Failed()) {
return false;
}
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) {
aAttr->ToString(resultStr);
}
bool oneWasAdded = false;
nsAutoTArray<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 (oneWasAdded ||
(!resultStr.IsEmpty() &&
!nsContentUtils::IsHTMLWhitespace(resultStr.Last()))) {
resultStr.Append(' ');
resultStr.Append(aToken);
} else {
resultStr.Append(aToken);
}
oneWasAdded = true;
addedClasses.AppendElement(aToken);
}
mElement->SetAttr(kNameSpaceID_None, mAttrAtom, resultStr, true);
}
void
nsDOMTokenList::Add(const nsTArray<nsString>& aTokens, ErrorResult& aError)
{
aError = CheckTokens(aTokens);
if (aError.Failed()) {
return;
}
const nsAttrValue* attr = GetParsedAttr();
AddInternal(attr, aTokens);
}
void
nsDOMTokenList::Add(const nsAString& aToken, mozilla::ErrorResult& aError)
{
nsAutoTArray<nsString, 1> tokens;
tokens.AppendElement(aToken);
Add(tokens, aError);
}
void
nsDOMTokenList::RemoveInternal(const nsAttrValue* aAttr,
const nsTArray<nsString>& aTokens)
{
NS_ABORT_IF_FALSE(aAttr, "Need an attribute");
nsAutoString input;
aAttr->ToString(input);
nsAString::const_iterator copyStart, tokenStart, iter, end;
input.BeginReading(iter);
input.EndReading(end);
copyStart = iter;
nsAutoString output;
bool lastTokenRemoved = false;
while (iter != end) {
// skip whitespace.
while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) {
++iter;
}
if (iter == end) {
// At this point we're sure the last seen token (if any) wasn't to be
// removed. So the trailing spaces will need to be kept.
NS_ABORT_IF_FALSE(!lastTokenRemoved, "How did this happen?");
output.Append(Substring(copyStart, end));
break;
}
tokenStart = iter;
do {
++iter;
} while (iter != end && !nsContentUtils::IsHTMLWhitespace(*iter));
if (aTokens.Contains(Substring(tokenStart, iter))) {
// Skip whitespace after the token, it will be collapsed.
while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) {
++iter;
}
copyStart = iter;
lastTokenRemoved = true;
} else {
if (lastTokenRemoved && !output.IsEmpty()) {
NS_ABORT_IF_FALSE(!nsContentUtils::IsHTMLWhitespace(
output.Last()), "Invalid last output token");
output.Append(char16_t(' '));
}
lastTokenRemoved = false;
output.Append(Substring(copyStart, iter));
copyStart = iter;
}
}
mElement->SetAttr(kNameSpaceID_None, mAttrAtom, output, true);
}
void
nsDOMTokenList::Remove(const nsTArray<nsString>& aTokens, ErrorResult& aError)
{
aError = CheckTokens(aTokens);
if (aError.Failed()) {
return;
}
const nsAttrValue* attr = GetParsedAttr();
if (!attr) {
return;
}
RemoveInternal(attr, aTokens);
}
void
nsDOMTokenList::Remove(const nsAString& aToken, mozilla::ErrorResult& aError)
{
nsAutoTArray<nsString, 1> tokens;
tokens.AppendElement(aToken);
Remove(tokens, aError);
}
bool
nsDOMTokenList::Toggle(const nsAString& aToken,
const Optional<bool>& aForce,
ErrorResult& aError)
{
aError = CheckToken(aToken);
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);
nsAutoTArray<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;
}
void
nsDOMTokenList::Stringify(nsAString& aResult)
{
if (!mElement) {
aResult.Truncate();
return;
}
mElement->GetAttr(kNameSpaceID_None, mAttrAtom, aResult);
}
JSObject*
nsDOMTokenList::WrapObject(JSContext *cx)
{
return DOMTokenListBinding::Wrap(cx, this);
}