Bug 922669 - Part 2: Use a different operator to represent the element -> pseudo-element relationship in selectors. r=bz

layout/style/StyleRule.cpp

@@ -550,7 +550,7 @@ nsCSSSelector::ToString(nsAString& aString, nsCSSStyleSheet* aSheet,
       const nsCSSSelector *next = stack.ElementAt(index - 1);
       PRUnichar oper = s->mOperator;
       if (next->IsPseudoElement()) {
-        NS_ASSERTION(oper == PRUnichar('>'),
+        NS_ASSERTION(oper == PRUnichar(':'),
                      "improperly chained pseudo element");
       } else {
         NS_ASSERTION(oper != PRUnichar(0),

layout/style/nsCSSParser.cpp

@@ -4218,12 +4218,12 @@ CSSParserImpl::ParseSelector(nsCSSSelectorList* aList,
                                           &pseudoElementType);
       if (pseudoElement &&
           pseudoElementType != nsCSSPseudoElements::ePseudo_AnonBox) {
-        // Pseudo-elements other than anonymous boxes are represented as
-        // direct children ('>' combinator) of the rest of the selector.
+        // Pseudo-elements other than anonymous boxes are represented with
+        // a special ':' combinator.
 
         aList->mWeight += selector->CalcWeight();
 
-        selector = aList->AddSelector('>');
+        selector = aList->AddSelector(':');
 
         selector->mLowercaseTag.swap(pseudoElement);
         selector->mClassList = pseudoElementArgs.forget();

layout/style/nsCSSRuleProcessor.cpp

@@ -2990,7 +2990,7 @@ AddRule(RuleSelectorPair* aRuleInfo, RuleCascadeData* aCascade)
     }
     NS_ASSERTION(aRuleInfo->mSelector->mNext,
                  "Must have mNext; parser screwed up");
-    NS_ASSERTION(aRuleInfo->mSelector->mNext->mOperator == '>',
+    NS_ASSERTION(aRuleInfo->mSelector->mNext->mOperator == ':',
                  "Unexpected mNext combinator");
     aRuleInfo->mSelector = aRuleInfo->mSelector->mNext;
     ruleHash->AppendRule(*aRuleInfo);