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-rw-r--r--dom/html/nsDOMStringMap.cpp261
1 files changed, 261 insertions, 0 deletions
diff --git a/dom/html/nsDOMStringMap.cpp b/dom/html/nsDOMStringMap.cpp
new file mode 100644
index 000000000..42725bc6f
--- /dev/null
+++ b/dom/html/nsDOMStringMap.cpp
@@ -0,0 +1,261 @@
+/* -*- 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 "nsDOMStringMap.h"
+
+#include "jsapi.h"
+#include "nsError.h"
+#include "nsGenericHTMLElement.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/DOMStringMapBinding.h"
+#include "nsIDOMMutationEvent.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMStringMap)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMStringMap)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMStringMap)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+ // Check that mElement exists in case the unlink code is run more than once.
+ if (tmp->mElement) {
+ // Call back to element to null out weak reference to this object.
+ tmp->mElement->ClearDataset();
+ tmp->mElement->RemoveMutationObserver(tmp);
+ tmp->mElement = nullptr;
+ }
+ tmp->mExpandoAndGeneration.OwnerUnlinked();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(nsDOMStringMap)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMStringMap)
+ NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+ NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMStringMap)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMStringMap)
+
+nsDOMStringMap::nsDOMStringMap(Element* aElement)
+ : mElement(aElement),
+ mRemovingProp(false)
+{
+ mElement->AddMutationObserver(this);
+}
+
+nsDOMStringMap::~nsDOMStringMap()
+{
+ // Check if element still exists, may have been unlinked by cycle collector.
+ if (mElement) {
+ // Call back to element to null out weak reference to this object.
+ mElement->ClearDataset();
+ mElement->RemoveMutationObserver(this);
+ }
+}
+
+/* virtual */
+JSObject*
+nsDOMStringMap::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
+{
+ return DOMStringMapBinding::Wrap(cx, this, aGivenProto);
+}
+
+void
+nsDOMStringMap::NamedGetter(const nsAString& aProp, bool& found,
+ DOMString& aResult) const
+{
+ nsAutoString attr;
+
+ if (!DataPropToAttr(aProp, attr)) {
+ found = false;
+ return;
+ }
+
+ found = mElement->GetAttr(attr, aResult);
+}
+
+void
+nsDOMStringMap::NamedSetter(const nsAString& aProp,
+ const nsAString& aValue,
+ ErrorResult& rv)
+{
+ nsAutoString attr;
+ if (!DataPropToAttr(aProp, attr)) {
+ rv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
+ return;
+ }
+
+ nsresult res = nsContentUtils::CheckQName(attr, false);
+ if (NS_FAILED(res)) {
+ rv.Throw(res);
+ return;
+ }
+
+ nsCOMPtr<nsIAtom> attrAtom = NS_Atomize(attr);
+ MOZ_ASSERT(attrAtom, "Should be infallible");
+
+ res = mElement->SetAttr(kNameSpaceID_None, attrAtom, aValue, true);
+ if (NS_FAILED(res)) {
+ rv.Throw(res);
+ }
+}
+
+void
+nsDOMStringMap::NamedDeleter(const nsAString& aProp, bool& found)
+{
+ // Currently removing property, attribute is already removed.
+ if (mRemovingProp) {
+ found = false;
+ return;
+ }
+
+ nsAutoString attr;
+ if (!DataPropToAttr(aProp, attr)) {
+ found = false;
+ return;
+ }
+
+ nsCOMPtr<nsIAtom> attrAtom = NS_Atomize(attr);
+ MOZ_ASSERT(attrAtom, "Should be infallible");
+
+ found = mElement->HasAttr(kNameSpaceID_None, attrAtom);
+
+ if (found) {
+ mRemovingProp = true;
+ mElement->UnsetAttr(kNameSpaceID_None, attrAtom, true);
+ mRemovingProp = false;
+ }
+}
+
+void
+nsDOMStringMap::GetSupportedNames(nsTArray<nsString>& aNames)
+{
+ uint32_t attrCount = mElement->GetAttrCount();
+
+ // Iterate through all the attributes and add property
+ // names corresponding to data attributes to return array.
+ for (uint32_t i = 0; i < attrCount; ++i) {
+ const nsAttrName* attrName = mElement->GetAttrNameAt(i);
+ // Skip the ones that are not in the null namespace
+ if (attrName->NamespaceID() != kNameSpaceID_None) {
+ continue;
+ }
+
+ nsAutoString prop;
+ if (!AttrToDataProp(nsDependentAtomString(attrName->LocalName()),
+ prop)) {
+ continue;
+ }
+
+ aNames.AppendElement(prop);
+ }
+}
+
+/**
+ * Converts a dataset property name to the corresponding data attribute name.
+ * (ex. aBigFish to data-a-big-fish).
+ */
+bool nsDOMStringMap::DataPropToAttr(const nsAString& aProp,
+ nsAutoString& aResult)
+{
+ // aResult is an autostring, so don't worry about setting its capacity:
+ // SetCapacity is slow even when it's a no-op and we already have enough
+ // storage there for most cases, probably.
+ aResult.AppendLiteral("data-");
+
+ // Iterate property by character to form attribute name.
+ // Return syntax error if there is a sequence of "-" followed by a character
+ // in the range "a" to "z".
+ // Replace capital characters with "-" followed by lower case character.
+ // Otherwise, simply append character to attribute name.
+ const char16_t* start = aProp.BeginReading();
+ const char16_t* end = aProp.EndReading();
+ const char16_t* cur = start;
+ for (; cur < end; ++cur) {
+ const char16_t* next = cur + 1;
+ if (char16_t('-') == *cur && next < end &&
+ char16_t('a') <= *next && *next <= char16_t('z')) {
+ // Syntax error if character following "-" is in range "a" to "z".
+ return false;
+ }
+
+ if (char16_t('A') <= *cur && *cur <= char16_t('Z')) {
+ // Append the characters in the range [start, cur)
+ aResult.Append(start, cur - start);
+ // Uncamel-case characters in the range of "A" to "Z".
+ aResult.Append(char16_t('-'));
+ aResult.Append(*cur - 'A' + 'a');
+ start = next; // We've already appended the thing at *cur
+ }
+ }
+
+ aResult.Append(start, cur - start);
+
+ return true;
+}
+
+/**
+ * Converts a data attribute name to the corresponding dataset property name.
+ * (ex. data-a-big-fish to aBigFish).
+ */
+bool nsDOMStringMap::AttrToDataProp(const nsAString& aAttr,
+ nsAutoString& aResult)
+{
+ // If the attribute name does not begin with "data-" then it can not be
+ // a data attribute.
+ if (!StringBeginsWith(aAttr, NS_LITERAL_STRING("data-"))) {
+ return false;
+ }
+
+ // Start reading attribute from first character after "data-".
+ const char16_t* cur = aAttr.BeginReading() + 5;
+ const char16_t* end = aAttr.EndReading();
+
+ // Don't try to mess with aResult's capacity: the probably-no-op SetCapacity()
+ // call is not that fast.
+
+ // Iterate through attrName by character to form property name.
+ // If there is a sequence of "-" followed by a character in the range "a" to
+ // "z" then replace with upper case letter.
+ // Otherwise append character to property name.
+ for (; cur < end; ++cur) {
+ const char16_t* next = cur + 1;
+ if (char16_t('-') == *cur && next < end &&
+ char16_t('a') <= *next && *next <= char16_t('z')) {
+ // Upper case the lower case letters that follow a "-".
+ aResult.Append(*next - 'a' + 'A');
+ // Consume character to account for "-" character.
+ ++cur;
+ } else {
+ // Simply append character if camel case is not necessary.
+ aResult.Append(*cur);
+ }
+ }
+
+ return true;
+}
+
+void
+nsDOMStringMap::AttributeChanged(nsIDocument *aDocument, Element* aElement,
+ int32_t aNameSpaceID, nsIAtom* aAttribute,
+ int32_t aModType,
+ const nsAttrValue* aOldValue)
+{
+ if ((aModType == nsIDOMMutationEvent::ADDITION ||
+ aModType == nsIDOMMutationEvent::REMOVAL) &&
+ aNameSpaceID == kNameSpaceID_None &&
+ StringBeginsWith(nsDependentAtomString(aAttribute),
+ NS_LITERAL_STRING("data-"))) {
+ ++mExpandoAndGeneration.generation;
+ }
+}
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