CSS Parser: Implement parseRule

Source/core/css/parser/CSSParserTokenRange.cpp

Index: Source/core/css/parser/CSSParserTokenRange.cpp
diff --git a/Source/core/css/parser/CSSParserTokenRange.cpp b/Source/core/css/parser/CSSParserTokenRange.cpp
index 85a069d5d3c5d7737b5a7b0e4f99eff5173f75cd..1db898e611a1814188c9db7395d4fce70517a85c 100644
--- a/Source/core/css/parser/CSSParserTokenRange.cpp
+++ b/Source/core/css/parser/CSSParserTokenRange.cpp
@@ -26,6 +26,24 @@ CSSParserTokenRange CSSParserTokenRange::makeSubRange(const CSSParserToken* firs
     return CSSParserTokenRange(first, last);
 }
 
+CSSParserTokenRange CSSParserTokenRange::consumeBlock()
+{
+    ASSERT(peek().blockType() == CSSParserToken::BlockStart);
+    const CSSParserToken* start = &peek() + 1;
+    unsigned nestingLevel = 0;
+    do {
+        const CSSParserToken& token = consume();
+        if (token.blockType() == CSSParserToken::BlockStart)
+            nestingLevel++;
+        else if (token.blockType() == CSSParserToken::BlockEnd)
+            nestingLevel--;
+    } while (nestingLevel && m_first < m_last);
+
+    if (nestingLevel)
+        return makeSubRange(start, m_last); // Ended at EOF
+    return makeSubRange(start, m_last - 1);
+}
+
 void CSSParserTokenRange::consumeComponentValue()
 {
     // FIXME: This is going to do multiple passes over large sections of a stylesheet.