Add m-esr52 at 52.6.0

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;
+  }
+}