mirror of
https://github.com/mozilla/gecko-dev.git
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272 lines
8.0 KiB
C++
272 lines
8.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsDOMStringMap.h"
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#include "jsapi.h"
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#include "nsError.h"
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#include "nsGenericHTMLElement.h"
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#include "nsContentUtils.h"
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#include "mozilla/dom/DOMStringMapBinding.h"
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#include "nsIDOMMutationEvent.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMStringMap)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMStringMap)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMStringMap)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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// Check that mElement exists in case the unlink code is run more than once.
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if (tmp->mElement) {
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// Call back to element to null out weak reference to this object.
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tmp->mElement->ClearDataset();
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tmp->mElement->RemoveMutationObserver(tmp);
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tmp->mElement = nullptr;
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}
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tmp->mExpandoAndGeneration.Unlink();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsDOMStringMap)
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NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
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if (tmp->PreservingWrapper()) {
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NS_IMPL_CYCLE_COLLECTION_TRACE_JSVAL_MEMBER_CALLBACK(mExpandoAndGeneration.expando);
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}
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMStringMap)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMStringMap)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMStringMap)
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nsDOMStringMap::nsDOMStringMap(nsGenericHTMLElement* aElement)
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: mElement(aElement),
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mRemovingProp(false)
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{
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mElement->AddMutationObserver(this);
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}
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nsDOMStringMap::~nsDOMStringMap()
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{
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// Check if element still exists, may have been unlinked by cycle collector.
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if (mElement) {
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// Call back to element to null out weak reference to this object.
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mElement->ClearDataset();
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mElement->RemoveMutationObserver(this);
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}
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}
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/* virtual */
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JSObject*
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nsDOMStringMap::WrapObject(JSContext *cx)
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{
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return DOMStringMapBinding::Wrap(cx, this);
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}
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void
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nsDOMStringMap::NamedGetter(const nsAString& aProp, bool& found,
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DOMString& aResult) const
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{
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nsAutoString attr;
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if (!DataPropToAttr(aProp, attr)) {
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found = false;
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return;
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}
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found = mElement->GetAttr(attr, aResult);
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}
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bool
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nsDOMStringMap::NameIsEnumerable(const nsAString& aName)
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{
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return true;
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}
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void
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nsDOMStringMap::NamedSetter(const nsAString& aProp,
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const nsAString& aValue,
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ErrorResult& rv)
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{
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nsAutoString attr;
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if (!DataPropToAttr(aProp, attr)) {
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rv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
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return;
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}
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nsresult res = nsContentUtils::CheckQName(attr, false);
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if (NS_FAILED(res)) {
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rv.Throw(res);
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return;
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}
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nsCOMPtr<nsIAtom> attrAtom = do_GetAtom(attr);
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MOZ_ASSERT(attrAtom, "Should be infallible");
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res = mElement->SetAttr(kNameSpaceID_None, attrAtom, aValue, true);
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if (NS_FAILED(res)) {
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rv.Throw(res);
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}
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}
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void
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nsDOMStringMap::NamedDeleter(const nsAString& aProp, bool& found)
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{
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// Currently removing property, attribute is already removed.
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if (mRemovingProp) {
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found = false;
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return;
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}
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nsAutoString attr;
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if (!DataPropToAttr(aProp, attr)) {
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found = false;
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return;
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}
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nsCOMPtr<nsIAtom> attrAtom = do_GetAtom(attr);
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MOZ_ASSERT(attrAtom, "Should be infallible");
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found = mElement->HasAttr(kNameSpaceID_None, attrAtom);
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if (found) {
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mRemovingProp = true;
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mElement->UnsetAttr(kNameSpaceID_None, attrAtom, true);
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mRemovingProp = false;
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}
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}
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void
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nsDOMStringMap::GetSupportedNames(unsigned, nsTArray<nsString>& aNames)
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{
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uint32_t attrCount = mElement->GetAttrCount();
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// Iterate through all the attributes and add property
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// names corresponding to data attributes to return array.
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for (uint32_t i = 0; i < attrCount; ++i) {
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const nsAttrName* attrName = mElement->GetAttrNameAt(i);
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// Skip the ones that are not in the null namespace
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if (attrName->NamespaceID() != kNameSpaceID_None) {
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continue;
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}
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nsAutoString prop;
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if (!AttrToDataProp(nsDependentAtomString(attrName->LocalName()),
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prop)) {
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continue;
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}
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aNames.AppendElement(prop);
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}
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}
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/**
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* Converts a dataset property name to the corresponding data attribute name.
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* (ex. aBigFish to data-a-big-fish).
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*/
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bool nsDOMStringMap::DataPropToAttr(const nsAString& aProp,
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nsAutoString& aResult)
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{
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// aResult is an autostring, so don't worry about setting its capacity:
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// SetCapacity is slow even when it's a no-op and we already have enough
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// storage there for most cases, probably.
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aResult.AppendLiteral("data-");
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// Iterate property by character to form attribute name.
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// Return syntax error if there is a sequence of "-" followed by a character
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// in the range "a" to "z".
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// Replace capital characters with "-" followed by lower case character.
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// Otherwise, simply append character to attribute name.
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const char16_t* start = aProp.BeginReading();
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const char16_t* end = aProp.EndReading();
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const char16_t* cur = start;
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for (; cur < end; ++cur) {
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const char16_t* next = cur + 1;
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if (char16_t('-') == *cur && next < end &&
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char16_t('a') <= *next && *next <= char16_t('z')) {
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// Syntax error if character following "-" is in range "a" to "z".
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return false;
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}
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if (char16_t('A') <= *cur && *cur <= char16_t('Z')) {
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// Append the characters in the range [start, cur)
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aResult.Append(start, cur - start);
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// Uncamel-case characters in the range of "A" to "Z".
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aResult.Append(char16_t('-'));
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aResult.Append(*cur - 'A' + 'a');
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start = next; // We've already appended the thing at *cur
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}
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}
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aResult.Append(start, cur - start);
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return true;
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}
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/**
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* Converts a data attribute name to the corresponding dataset property name.
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* (ex. data-a-big-fish to aBigFish).
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*/
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bool nsDOMStringMap::AttrToDataProp(const nsAString& aAttr,
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nsAutoString& aResult)
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{
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// If the attribute name does not begin with "data-" then it can not be
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// a data attribute.
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if (!StringBeginsWith(aAttr, NS_LITERAL_STRING("data-"))) {
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return false;
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}
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// Start reading attribute from first character after "data-".
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const char16_t* cur = aAttr.BeginReading() + 5;
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const char16_t* end = aAttr.EndReading();
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// Don't try to mess with aResult's capacity: the probably-no-op SetCapacity()
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// call is not that fast.
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// Iterate through attrName by character to form property name.
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// If there is a sequence of "-" followed by a character in the range "a" to
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// "z" then replace with upper case letter.
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// Otherwise append character to property name.
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for (; cur < end; ++cur) {
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const char16_t* next = cur + 1;
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if (char16_t('-') == *cur && next < end &&
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char16_t('a') <= *next && *next <= char16_t('z')) {
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// Upper case the lower case letters that follow a "-".
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aResult.Append(*next - 'a' + 'A');
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// Consume character to account for "-" character.
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++cur;
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} else {
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// Simply append character if camel case is not necessary.
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aResult.Append(*cur);
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}
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}
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return true;
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}
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void
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nsDOMStringMap::AttributeChanged(nsIDocument *aDocument, Element* aElement,
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int32_t aNameSpaceID, nsIAtom* aAttribute,
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int32_t aModType)
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{
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if ((aModType == nsIDOMMutationEvent::ADDITION ||
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aModType == nsIDOMMutationEvent::REMOVAL) &&
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aNameSpaceID == kNameSpaceID_None &&
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StringBeginsWith(nsDependentAtomString(aAttribute),
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NS_LITERAL_STRING("data-"))) {
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++mExpandoAndGeneration.generation;
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}
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}
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