1 files changed, 283 insertions, 0 deletions
diff --git a/dom/base/nsMappedAttributes.cpp b/dom/base/nsMappedAttributes.cpp
new file mode 100644
index 000000000..a3accd2a7
--- /dev/null
+++ b/dom/base/nsMappedAttributes.cpp
@@ -0,0 +1,283 @@
+/* -*- 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/. */
+
+/*
+ * A unique per-element set of attributes that is used as an
+ * nsIStyleRule; used to implement presentational attributes.
+ */
+
+#include "nsMappedAttributes.h"
+#include "nsHTMLStyleSheet.h"
+#include "nsRuleWalker.h"
+#include "mozilla/HashFunctions.h"
+#include "mozilla/MemoryReporting.h"
+
+using namespace mozilla;
+
+nsMappedAttributes::nsMappedAttributes(nsHTMLStyleSheet* aSheet,
+                                       nsMapRuleToAttributesFunc aMapRuleFunc)
+  : mAttrCount(0),
+    mSheet(aSheet),
+    mRuleMapper(aMapRuleFunc)
+{
+}
+
+nsMappedAttributes::nsMappedAttributes(const nsMappedAttributes& aCopy)
+  : mAttrCount(aCopy.mAttrCount),
+    mSheet(aCopy.mSheet),
+    mRuleMapper(aCopy.mRuleMapper)
+{
+  NS_ASSERTION(mBufferSize >= aCopy.mAttrCount, "can't fit attributes");
+
+  uint32_t i;
+  for (i = 0; i < mAttrCount; ++i) {
+    new (&Attrs()[i]) InternalAttr(aCopy.Attrs()[i]);
+  }
+}
+
+nsMappedAttributes::~nsMappedAttributes()
+{
+  if (mSheet) {
+    mSheet->DropMappedAttributes(this);
+  }
+
+  uint32_t i;
+  for (i = 0; i < mAttrCount; ++i) {
+    Attrs()[i].~InternalAttr();
+  }
+}
+
+
+nsMappedAttributes*
+nsMappedAttributes::Clone(bool aWillAddAttr)
+{
+  uint32_t extra = aWillAddAttr ? 1 : 0;
+
+  // This will call the overridden operator new
+  return new (mAttrCount + extra) nsMappedAttributes(*this);
+}
+
+void* nsMappedAttributes::operator new(size_t aSize, uint32_t aAttrCount) CPP_THROW_NEW
+{
+  NS_ASSERTION(aAttrCount > 0, "zero-attribute nsMappedAttributes requested");
+
+  // aSize will include the mAttrs buffer so subtract that.
+  void* newAttrs = ::operator new(aSize - sizeof(void*[1]) +
+                                  aAttrCount * sizeof(InternalAttr));
+
+#ifdef DEBUG
+  static_cast<nsMappedAttributes*>(newAttrs)->mBufferSize = aAttrCount;
+#endif
+
+  return newAttrs;
+}
+
+NS_IMPL_ISUPPORTS(nsMappedAttributes,
+                  nsIStyleRule)
+
+void
+nsMappedAttributes::SetAndTakeAttr(nsIAtom* aAttrName, nsAttrValue& aValue)
+{
+  NS_PRECONDITION(aAttrName, "null name");
+
+  uint32_t i;
+  for (i = 0; i < mAttrCount && !Attrs()[i].mName.IsSmaller(aAttrName); ++i) {
+    if (Attrs()[i].mName.Equals(aAttrName)) {
+      Attrs()[i].mValue.Reset();
+      Attrs()[i].mValue.SwapValueWith(aValue);
+      return;
+    }
+  }
+
+  NS_ASSERTION(mBufferSize >= mAttrCount + 1, "can't fit attributes");
+
+  if (mAttrCount != i) {
+    memmove(&Attrs()[i + 1], &Attrs()[i], (mAttrCount - i) * sizeof(InternalAttr));
+  }
+
+  new (&Attrs()[i].mName) nsAttrName(aAttrName);
+  new (&Attrs()[i].mValue) nsAttrValue();
+  Attrs()[i].mValue.SwapValueWith(aValue);
+  ++mAttrCount;
+}
+
+const nsAttrValue*
+nsMappedAttributes::GetAttr(nsIAtom* aAttrName) const
+{
+  NS_PRECONDITION(aAttrName, "null name");
+
+  for (uint32_t i = 0; i < mAttrCount; ++i) {
+    if (Attrs()[i].mName.Equals(aAttrName)) {
+      return &Attrs()[i].mValue;
+    }
+  }
+
+  return nullptr;
+}
+
+const nsAttrValue*
+nsMappedAttributes::GetAttr(const nsAString& aAttrName) const
+{
+  for (uint32_t i = 0; i < mAttrCount; ++i) {
+    if (Attrs()[i].mName.Atom()->Equals(aAttrName)) {
+      return &Attrs()[i].mValue;
+    }
+  }
+
+  return nullptr;
+}
+
+bool
+nsMappedAttributes::Equals(const nsMappedAttributes* aOther) const
+{
+  if (this == aOther) {
+    return true;
+  }
+
+  if (mRuleMapper != aOther->mRuleMapper || mAttrCount != aOther->mAttrCount) {
+    return false;
+  }
+
+  uint32_t i;
+  for (i = 0; i < mAttrCount; ++i) {
+    if (!Attrs()[i].mName.Equals(aOther->Attrs()[i].mName) ||
+        !Attrs()[i].mValue.Equals(aOther->Attrs()[i].mValue)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+uint32_t
+nsMappedAttributes::HashValue() const
+{
+  uint32_t hash = HashGeneric(mRuleMapper);
+
+  uint32_t i;
+  for (i = 0; i < mAttrCount; ++i) {
+    hash = AddToHash(hash,
+                     Attrs()[i].mName.HashValue(),
+                     Attrs()[i].mValue.HashValue());
+  }
+
+  return hash;
+}
+
+void
+nsMappedAttributes::SetStyleSheet(nsHTMLStyleSheet* aSheet)
+{
+  if (mSheet) {
+    mSheet->DropMappedAttributes(this);
+  }
+  mSheet = aSheet;  // not ref counted
+}
+
+/* virtual */ void
+nsMappedAttributes::MapRuleInfoInto(nsRuleData* aRuleData)
+{
+  if (mRuleMapper) {
+    (*mRuleMapper)(this, aRuleData);
+  }
+}
+
+/* virtual */ bool
+nsMappedAttributes::MightMapInheritedStyleData()
+{
+  // Just assume that we do, rather than adding checks to all of the different
+  // kinds of attribute mapping functions we have.
+  return true;
+}
+
+/* virtual */ bool
+nsMappedAttributes::GetDiscretelyAnimatedCSSValue(nsCSSPropertyID aProperty,
+                                                  nsCSSValue* aValue)
+{
+  MOZ_ASSERT(false, "GetDiscretelyAnimatedCSSValue is not implemented yet");
+  return false;
+}
+
+#ifdef DEBUG
+/* virtual */ void
+nsMappedAttributes::List(FILE* out, int32_t aIndent) const
+{
+  nsAutoCString str;
+  nsAutoString tmp;
+  uint32_t i;
+
+  for (i = 0; i < mAttrCount; ++i) {
+    int32_t indent;
+    for (indent = aIndent; indent > 0; --indent) {
+      str.AppendLiteral("  ");
+    }
+
+    Attrs()[i].mName.GetQualifiedName(tmp);
+    LossyAppendUTF16toASCII(tmp, str);
+
+    Attrs()[i].mValue.ToString(tmp);
+    LossyAppendUTF16toASCII(tmp, str);
+    str.Append('\n');
+    fprintf_stderr(out, "%s", str.get());
+  }
+}
+#endif
+
+void
+nsMappedAttributes::RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue)
+{
+  Attrs()[aPos].mValue.SwapValueWith(aValue);
+  Attrs()[aPos].~InternalAttr();
+  memmove(&Attrs()[aPos], &Attrs()[aPos + 1],
+          (mAttrCount - aPos - 1) * sizeof(InternalAttr));
+  mAttrCount--;
+}
+
+const nsAttrName*
+nsMappedAttributes::GetExistingAttrNameFromQName(const nsAString& aName) const
+{
+  uint32_t i;
+  for (i = 0; i < mAttrCount; ++i) {
+    if (Attrs()[i].mName.IsAtom()) {
+      if (Attrs()[i].mName.Atom()->Equals(aName)) {
+        return &Attrs()[i].mName;
+      }
+    }
+    else {
+      if (Attrs()[i].mName.NodeInfo()->QualifiedNameEquals(aName)) {
+        return &Attrs()[i].mName;
+      }
+    }
+  }
+
+  return nullptr;
+}
+
+int32_t
+nsMappedAttributes::IndexOfAttr(nsIAtom* aLocalName) const
+{
+  uint32_t i;
+  for (i = 0; i < mAttrCount; ++i) {
+    if (Attrs()[i].mName.Equals(aLocalName)) {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+size_t
+nsMappedAttributes::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
+{
+  NS_ASSERTION(mAttrCount == mBufferSize,
+               "mBufferSize and mAttrCount are expected to be the same.");
+
+  size_t n = aMallocSizeOf(this);
+  for (uint16_t i = 0; i < mAttrCount; ++i) {
+    n += Attrs()[i].mValue.SizeOfExcludingThis(aMallocSizeOf);
+  }
+  return n;
+}
+