Implemented RuleSet diff for active stylesheets.

third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp

Index: third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
diff --git a/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp b/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4665342a92603991325d63538f26d49a8c33ecab
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
@@ -0,0 +1,193 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/css/ActiveStyleSheets.h"
+
+#include "core/css/CSSStyleSheet.h"
+#include "core/css/MediaQueryEvaluator.h"
+#include "core/css/StyleSheetContents.h"
+#include "core/css/parser/CSSParserMode.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class ActiveStyleSheetsTest : public ::testing::Test {
+public:
+    static CSSStyleSheet* createSheet()
+    {
+        StyleSheetContents* contents = StyleSheetContents::create(CSSParserContext(HTMLStandardMode, nullptr));
+        contents->ensureRuleSet(MediaQueryEvaluator(), RuleHasDocumentSecurityOrigin);
+        return CSSStyleSheet::create(contents);
+    }
+};
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_NoChange)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    EXPECT_EQ(NoActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    EXPECT_EQ(0u, changedRuleSets.size());
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+
+    newSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+
+    EXPECT_EQ(NoActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    EXPECT_EQ(0u, changedRuleSets.size());
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_AppendedToEmpty)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+
+    newSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsAppended, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    EXPECT_EQ(2u, changedRuleSets.size());
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_AppendedToNonEmpty)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsAppended, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    EXPECT_EQ(1u, changedRuleSets.size());
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_Mutated)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+    CSSStyleSheet* sheet3 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    sheet2->contents()->clearRuleSet();
+    sheet2->contents()->ensureRuleSet(MediaQueryEvaluator(), RuleHasDocumentSecurityOrigin);
+
+    EXPECT_NE(oldSheets[1].second, &sheet2->contents()->ruleSet());
+
+    newSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    ASSERT_EQ(2u, changedRuleSets.size());
+    EXPECT_EQ(&sheet2->contents()->ruleSet(), changedRuleSets[0]);
+    EXPECT_EQ(oldSheets[1].second, changedRuleSets[1]);
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_Inserted)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+    CSSStyleSheet* sheet3 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    newSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    ASSERT_EQ(1u, changedRuleSets.size());
+    EXPECT_EQ(&sheet2->contents()->ruleSet(), changedRuleSets[0]);
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_Removed)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+    CSSStyleSheet* sheet3 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    newSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    ASSERT_EQ(1u, changedRuleSets.size());
+    EXPECT_EQ(&sheet2->contents()->ruleSet(), changedRuleSets[0]);
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_RemovedAll)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+    CSSStyleSheet* sheet3 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    EXPECT_EQ(3u, changedRuleSets.size());
+}
+
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_InsertedAndRemoved)
+{
+    ActiveStyleSheetVector oldSheets;
+    ActiveStyleSheetVector newSheets;
+    HeapVector<Member<RuleSet>> changedRuleSets;
+
+    CSSStyleSheet* sheet1 = createSheet();
+    CSSStyleSheet* sheet2 = createSheet();
+    CSSStyleSheet* sheet3 = createSheet();
+
+    oldSheets.append(std::make_pair(sheet1, &sheet1->contents()->ruleSet()));
+    oldSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+
+    newSheets.append(std::make_pair(sheet2, &sheet2->contents()->ruleSet()));
+    newSheets.append(std::make_pair(sheet3, &sheet3->contents()->ruleSet()));
+
+    EXPECT_EQ(ActiveSheetsChanged, compareActiveStyleSheets(oldSheets, newSheets, changedRuleSets));
+    ASSERT_EQ(2u, changedRuleSets.size());
+    EXPECT_EQ(&sheet1->contents()->ruleSet(), changedRuleSets[0]);
+    EXPECT_EQ(&sheet3->contents()->ruleSet(), changedRuleSets[1]);
+}
+
+} // namespace blink