Moved MQ parsing block tracking to tokenizer

Source/core/css/parser/MediaQueryTokenizerTest.cpp

Index: Source/core/css/parser/MediaQueryTokenizerTest.cpp
diff --git a/Source/core/css/parser/MediaQueryTokenizerTest.cpp b/Source/core/css/parser/MediaQueryTokenizerTest.cpp
index 0f9a5ee75e96defa7a039d760f0b6bb80b8de376..3e1568b8559450a42a098c20fe198300727e5779 100644
--- a/Source/core/css/parser/MediaQueryTokenizerTest.cpp
+++ b/Source/core/css/parser/MediaQueryTokenizerTest.cpp
@@ -15,6 +15,11 @@ typedef struct {
     const char* output;
 } TestCase;
 
+typedef struct {
+    const char* input;
+    const unsigned maxLevel;
+} BlockTestCase;
+
 TEST(MediaQueryTokenizerTest, Basic)
 {
     TestCase testCases[] = {
@@ -51,6 +56,56 @@ TEST(MediaQueryTokenizerTest, Basic)
     }
 }
 
+TEST(MediaQueryTokenizerBlockTest, Basic)
+{
+    BlockTestCase testCases[] = {
+        {"(max-width: 800px()), (max-width: 800px)", 2},
+        {"(max-width: 900px(()), (max-width: 900px)", 3},
+        {"(max-width: 600px(())))), (max-width: 600px)", 3},
+        {"(max-width: 500px(((((((((())))), (max-width: 500px)", 11},
+        {"(max-width: 800px[]), (max-width: 800px)", 2},
+        {"(max-width: 900px[[]), (max-width: 900px)", 3},
+        {"(max-width: 600px[[]]]]), (max-width: 600px)", 3},
+        {"(max-width: 500px[[[[[[[[[[]]]]), (max-width: 500px)", 11},
+        {"(max-width: 800px{}), (max-width: 800px)", 2},
+        {"(max-width: 900px{{}), (max-width: 900px)", 3},
+        {"(max-width: 600px{{}}}}), (max-width: 600px)", 3},
+        {"(max-width: 500px{{{{{{{{{{}}}}), (max-width: 500px)", 11},
+        {"[(), (max-width: 400px)", 2},
+        {"[{}, (max-width: 500px)", 2},
+        {"[{]}], (max-width: 900px)", 2},
+        {"[{[]{}{{{}}}}], (max-width: 900px)", 5},
+        {"[{[}], (max-width: 900px)", 3},
+        {"[({)}], (max-width: 900px)", 3},
+        {"[]((), (max-width: 900px)", 2},
+        {"((), (max-width: 900px)", 2},
+        {"(foo(), (max-width: 900px)", 2},
+        {"[](()), (max-width: 900px)", 2},
+        {"all an[isdfs bla())(i())]icalc(i)(()), (max-width: 400px)", 3},
+        {"all an[isdfs bla())(]icalc(i)(()), (max-width: 500px)", 4},
+        {"all an[isdfs bla())(]icalc(i)(())), (max-width: 600px)", 4},
+        {"all an[isdfs bla())(]icalc(i)(()))], (max-width: 800px)", 4},
+        {0, 0} // Do not remove the terminator line.
+    };
+    for (int i = 0; testCases[i].input; ++i) {
+        Vector<MediaQueryToken> tokens;
+        MediaQueryTokenizer::tokenize(testCases[i].input, tokens);
+
+        unsigned maxLevel = 0;
+        unsigned level = 0;
+        for (size_t j = 0; j < tokens.size(); ++j) {
+            if (tokens[j].blockToken() == MediaQueryToken::BlockStart)
+                ++level;
+            else if (tokens[j].blockToken() == MediaQueryToken::BlockEnd)
+                --level;
+
+            ASSERT_GE(level, (unsigned)0);
+            maxLevel = std::max(level, maxLevel);
+        }
+        ASSERT_EQ(testCases[i].maxLevel, maxLevel);
+    }
+}
+
 void testToken(UChar c, MediaQueryTokenType tokenType)
 {
     Vector<MediaQueryToken> tokens;