The Tor Browser: content/base/src/nsDOMTokenList.cpp@6474c204b198 (annotated)

content/base/src/nsDOMTokenList.cpp@6474c204b198 (annotated)

content/base/src/nsDOMTokenList.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* 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
   SetIsDOMBinding();
 }
 nsDOMTokenList::~nsDOMTokenList() { }
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(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(NS_LITERAL_STRING(" ") + 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);
 }

The Tor Browser / annotate

content/base/src/nsDOMTokenList.cpp@6474c204b198 (annotated)

content/base/src/nsDOMTokenList.cpp