More LayoutLocale refactor with additional Chinese support

third_party/WebKit/Source/platform/LayoutLocaleTest.cpp

 // 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 "platform/LayoutLocale.h"
 
 #include "platform/Logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 TEST(LayoutLocaleTest, Get)
 {
     LayoutLocale::clearForTesting();
 
     EXPECT_EQ(nullptr, LayoutLocale::get(nullAtom));
 
     EXPECT_EQ(emptyAtom, LayoutLocale::get(emptyAtom)->localeString());
 
-    EXPECT_TRUE(equalIgnoringCase("en-us", LayoutLocale::get("en-us")->localeString()));
-    EXPECT_TRUE(equalIgnoringCase("ja-jp", LayoutLocale::get("ja-jp")->localeString()));
+    EXPECT_STRCASEEQ("en-us", LayoutLocale::get("en-us")->localeString().ascii().data());
+    EXPECT_STRCASEEQ("ja-jp", LayoutLocale::get("ja-jp")->localeString().ascii().data());
 
     LayoutLocale::clearForTesting();
 }
 
 TEST(LayoutLocaleTest, GetCaseInsensitive)
 {
     const LayoutLocale* enUS = LayoutLocale::get("en-us");
     EXPECT_EQ(enUS, LayoutLocale::get("en-US"));
 }
 
+TEST(LayoutLocaleTest, ScriptTest)
+{
+    // Test combinations of BCP 47 locales.
+    // https://tools.ietf.org/html/bcp47
+    struct {
+        const char* locale;
+        UScriptCode script;
+        bool hasScriptForHan;
+        UScriptCode scriptForHan;
+    } tests[] = {
+        { "en-US", USCRIPT_LATIN },
+
+        // Common lang-region in East Asia.
+        { "ja-JP", USCRIPT_KATAKANA_OR_HIRAGANA, true },
+        { "ko-KR", USCRIPT_HANGUL, true },
+        { "zh", USCRIPT_SIMPLIFIED_HAN, true },
+        { "zh-CN", USCRIPT_SIMPLIFIED_HAN, true },
+        { "zh-HK", USCRIPT_TRADITIONAL_HAN, true },
+        { "zh-MO", USCRIPT_TRADITIONAL_HAN, true },
+        { "zh-SG", USCRIPT_SIMPLIFIED_HAN, true },
+        { "zh-TW", USCRIPT_TRADITIONAL_HAN, true },
+
+        // Encompassed languages within the Chinese macrolanguage.
+        // Both "lang" and "lang-extlang" should work.
+        { "nan", USCRIPT_TRADITIONAL_HAN, true },
+        { "wuu", USCRIPT_SIMPLIFIED_HAN, true },
+        { "yue", USCRIPT_TRADITIONAL_HAN, true },
+        { "zh-nan", USCRIPT_TRADITIONAL_HAN, true },
+        { "zh-wuu", USCRIPT_SIMPLIFIED_HAN, true },
+        { "zh-yue", USCRIPT_TRADITIONAL_HAN, true },
+
+        // Script has priority over other subtags.
+        { "zh-Hant", USCRIPT_TRADITIONAL_HAN, true },
+        { "en-Hans", USCRIPT_SIMPLIFIED_HAN, true },
+        { "en-Hant", USCRIPT_TRADITIONAL_HAN, true },
+        { "en-Hans-TW", USCRIPT_SIMPLIFIED_HAN, true },
+        { "en-Hant-CN", USCRIPT_TRADITIONAL_HAN, true },
+        { "wuu-Hant", USCRIPT_TRADITIONAL_HAN, true },
+        { "yue-Hans", USCRIPT_SIMPLIFIED_HAN, true },
+        { "zh-wuu-Hant", USCRIPT_TRADITIONAL_HAN, true },
+        { "zh-yue-Hans", USCRIPT_SIMPLIFIED_HAN, true },
+
+        // Lang has priority over region.
+        // icu::Locale::getDefault() returns other combinations if, for instnace,
+        // English Windows with the display language set to Japanese.
+        { "ja", USCRIPT_KATAKANA_OR_HIRAGANA, true },
+        { "ja-US", USCRIPT_KATAKANA_OR_HIRAGANA, true },
+        { "ko", USCRIPT_HANGUL, true },
+        { "ko-US", USCRIPT_HANGUL, true },
+        { "wuu-TW", USCRIPT_SIMPLIFIED_HAN, true },
+        { "yue-CN", USCRIPT_TRADITIONAL_HAN, true },
+        { "zh-wuu-TW", USCRIPT_SIMPLIFIED_HAN, true },
+        { "zh-yue-CN", USCRIPT_TRADITIONAL_HAN, true },
+
+        // Region should not affect script, but it can influence scriptForHan.
+        { "en-CN", USCRIPT_LATIN, false },
+        { "en-HK", USCRIPT_LATIN, true, USCRIPT_TRADITIONAL_HAN },
+        { "en-MO", USCRIPT_LATIN, true, USCRIPT_TRADITIONAL_HAN },
+        { "en-SG", USCRIPT_LATIN, false },
+        { "en-TW", USCRIPT_LATIN, true, USCRIPT_TRADITIONAL_HAN },
+        { "en-JP", USCRIPT_LATIN, true, USCRIPT_KATAKANA_OR_HIRAGANA },
+        { "en-KR", USCRIPT_LATIN, true, USCRIPT_HANGUL },
+
+        // Multiple regions are invalid, but it can still give hints for the font selection.
+        { "en-US-JP", USCRIPT_LATIN, true, USCRIPT_KATAKANA_OR_HIRAGANA },
+    };
+
+    for (const auto& test : tests) {
+        RefPtr<LayoutLocale> locale = LayoutLocale::createForTesting(test.locale);
+        EXPECT_EQ(test.script, locale->script()) << test.locale;
+        EXPECT_EQ(test.hasScriptForHan, locale->hasScriptForHan()) << test.locale;
+        if (!test.hasScriptForHan)
+            EXPECT_EQ(USCRIPT_SIMPLIFIED_HAN, locale->scriptForHan()) << test.locale;
+        else if (test.scriptForHan)
+            EXPECT_EQ(test.scriptForHan, locale->scriptForHan()) << test.locale;
+        else
+            EXPECT_EQ(test.script, locale->scriptForHan()) << test.locale;
+    }
+}
+
 } // namespace blink