Optimize RTL check in ICU to avoid mmap access.

base/i18n/rtl_unittest.cc

 // Copyright (c) 2011 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 "base/i18n/rtl.h"
 
 #include <algorithm>
 
 #include "base/files/file_path.h"
 #include "base/strings/string_util.h"
@@ skipping 381 matching lines @@
   // Chinese in China with '-'.
   EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocale("zh-CN"));
   // Filipino : 3-letter code
   EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocale("fil"));
   // Russian
   EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocale("ru"));
   // Japanese that uses multiple scripts
   EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocale("ja"));
 }
 
+TEST_F(RTLTest, GetTextDirectionForLocaleInStartUp) {
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("ar"));
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("ar_EG"));
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("he"));
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("he_IL"));
+  // iw is an obsolete code for Hebrew.
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("iw"));
+  // Although we're not yet localized to Farsi and Urdu, we
+  // do have the text layout direction information for them.
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("fa"));
+  EXPECT_EQ(RIGHT_TO_LEFT, GetTextDirectionForLocaleInStartUp("ur"));
+  EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocaleInStartUp("en"));
+  // Chinese in China with '-'.
+  EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocaleInStartUp("zh-CN"));
+  // Filipino : 3-letter code
+  EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocaleInStartUp("fil"));
+  // Russian
+  EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocaleInStartUp("ru"));
+  // Japanese that uses multiple scripts
+  EXPECT_EQ(LEFT_TO_RIGHT, GetTextDirectionForLocaleInStartUp("ja"));
+}
+
 TEST_F(RTLTest, UnadjustStringForLocaleDirection) {
   // These test strings are borrowed from WrapPathWithLTRFormatting
   const wchar_t* cases[] = {
     L"foo bar",
     L"foo \x05d0 bar",
     L"\x05d0 foo bar",
     L"!foo \x05d0 bar",
     L",\x05d0 foo bar",
     L"\x202a \x05d0 foo  bar",
     L"\x202d \x05d0 foo  bar",
@@ skipping 20 matching lines @@
       EXPECT_EQ(test_case, adjusted_string) << " for test case [" << test_case
                                             << "] with IsRTL() == " << IsRTL();
     }
   }
 
   EXPECT_EQ(was_rtl, IsRTL());
 }
 
 }  // namespace i18n
 }  // namespace base