Bug 1346256 Part 2: Define methods in ServoCSSRuleList to fill a hash of RawServoStyleRule to ServoStyleRule. r=heycam,xidorn

MozReview-Commit-ID: 4Swb9KwV0uO

--HG--
extra : rebase_source : 496b33bfdeaa4c4715796df6a8baa3fe1b4a9531

layout/style/ServoCSSRuleList.cpp

@@ -202,6 +202,26 @@ ServoCSSRuleList::GetRuleType(uint32_t aIndex) const
   return CastToPtr(rule)->Type();
 }
 
+void
+ServoCSSRuleList::FillStyleRuleHashtable(StyleRuleHashtable& aTable)
+{
+  for (uint32_t i = 0; i < mRules.Length(); i++) {
+    uint16_t type = GetRuleType(i);
+    if (type == nsIDOMCSSRule::STYLE_RULE) {
+      ServoStyleRule* castedRule = static_cast<ServoStyleRule*>(GetRule(i));
+      RawServoStyleRule* rawRule = castedRule->Raw();
+      aTable.Put(rawRule, castedRule);
+    } else if (type == nsIDOMCSSRule::MEDIA_RULE) {
+      ServoMediaRule* castedRule = static_cast<ServoMediaRule*>(GetRule(i));
+
+      // Call this method recursively on the ServoCSSRuleList in the rule.
+      ServoCSSRuleList* castedRuleList = static_cast<ServoCSSRuleList*>(
+        castedRule->CssRules());
+      castedRuleList->FillStyleRuleHashtable(aTable);
+    }
+  }
+}
+
 ServoCSSRuleList::~ServoCSSRuleList()
 {
   DropAllRules();

layout/style/ServoCSSRuleList.h

@@ -11,9 +11,11 @@
 
 #include "mozilla/ServoBindingTypes.h"
 #include "mozilla/dom/CSSRuleList.h"
+#include "nsDataHashtable.h"
 
 namespace mozilla {
 
+class ServoStyleRule;
 class ServoStyleSheet;
 namespace css {
 class GroupRule;
@@ -44,6 +46,10 @@ public:
 
   uint16_t GetRuleType(uint32_t aIndex) const;
 
+  typedef nsDataHashtable<nsPtrHashKey<const RawServoStyleRule>,
+                          ServoStyleRule*> StyleRuleHashtable;
+  void FillStyleRuleHashtable(StyleRuleHashtable& aTable);
+
 private:
   virtual ~ServoCSSRuleList();