rtl.cc revision 5821806d5e7f356e8fa4b058a389a808ea183019
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/i18n/rtl.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/file_path.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/string_util.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/utf_string_conversions.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/sys_string_conversions.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "unicode/coll.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "unicode/locid.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "unicode/uchar.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "unicode/uscript.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(TOOLKIT_GTK) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <gtk/gtk.h> 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Extract language, country and variant, but ignore keywords. For example, 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// en-US, ca@valencia, ca-ES@valencia. 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::string GetLocaleString(const icu::Locale& locale) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* language = locale.getLanguage(); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* country = locale.getCountry(); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* variant = locale.getVariant(); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string result = 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (language != NULL && *language != '\0') ? language : "und"; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (country != NULL && *country != '\0') { 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result += '-'; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result += country; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (variant != NULL && *variant != '\0') { 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string variant_str(variant); 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) StringToLowerASCII(&variant_str); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result += '@' + variant_str; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return result; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace i18n { 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Represents the locale-specific ICU text direction. 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static TextDirection g_icu_text_direction = UNKNOWN_DIRECTION; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Convert the ICU default locale to a string. 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::string GetConfiguredLocale() { 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return GetLocaleString(icu::Locale::getDefault()); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Convert the ICU canonicalized locale to a string. 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::string GetCanonicalLocale(const char* locale) { 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return GetLocaleString(icu::Locale::createCanonical(locale)); 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Convert Chrome locale name to ICU locale name 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::string ICULocaleName(const std::string& locale_string) { 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If not Spanish, just return it. 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (locale_string.substr(0, 2) != "es") 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return locale_string; 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Expand es to es-ES. 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (LowerCaseEqualsASCII(locale_string, "es")) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return "es-ES"; 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Map es-419 (Latin American Spanish) to es-FOO depending on the system 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // locale. If it's es-RR other than es-ES, map to es-RR. Otherwise, map 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // to es-MX (the most populous in Spanish-speaking Latin America). 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (LowerCaseEqualsASCII(locale_string, "es-419")) { 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const icu::Locale& locale = icu::Locale::getDefault(); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string language = locale.getLanguage(); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* country = locale.getCountry(); 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (LowerCaseEqualsASCII(language, "es") && 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !LowerCaseEqualsASCII(country, "es")) { 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) language += '-'; 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) language += country; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return language; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return "es-MX"; 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Currently, Chrome has only "es" and "es-419", but later we may have 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // more specific "es-RR". 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return locale_string; 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void SetICUDefaultLocale(const std::string& locale_string) { 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) icu::Locale locale(ICULocaleName(locale_string).c_str()); 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UErrorCode error_code = U_ZERO_ERROR; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) icu::Locale::setDefault(locale, error_code); 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This return value is actually bogus because Locale object is 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // an ID and setDefault seems to always succeed (regardless of the 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // presence of actual locale data). However, 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // it does not hurt to have it as a sanity check. 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(U_SUCCESS(error_code)); 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_icu_text_direction = UNKNOWN_DIRECTION; 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool IsRTL() { 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(TOOLKIT_GTK) 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GtkTextDirection gtk_dir = gtk_widget_get_default_direction(); 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return gtk_dir == GTK_TEXT_DIR_RTL; 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ICUIsRTL(); 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ICUIsRTL() { 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (g_icu_text_direction == UNKNOWN_DIRECTION) { 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const icu::Locale& locale = icu::Locale::getDefault(); 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_icu_text_direction = GetTextDirectionForLocale(locale.getName()); 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return g_icu_text_direction == RIGHT_TO_LEFT; 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)TextDirection GetTextDirectionForLocale(const char* locale_name) { 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UErrorCode status = U_ZERO_ERROR; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ULayoutType layout_dir = uloc_getCharacterOrientation(locale_name, &status); 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(U_SUCCESS(status)); 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Treat anything other than RTL as LTR. 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (layout_dir != ULOC_LAYOUT_RTL) ? LEFT_TO_RIGHT : RIGHT_TO_LEFT; 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)TextDirection GetFirstStrongCharacterDirection(const string16& text) { 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const UChar* string = text.c_str(); 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t length = text.length(); 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t position = 0; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (position < length) { 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UChar32 character; 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t next_position = position; 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) U16_NEXT(string, next_position, length, character); 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Now that we have the character, we use ICU in order to query for the 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // appropriate Unicode BiDi character type. 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int32_t property = u_getIntPropertyValue(character, UCHAR_BIDI_CLASS); 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((property == U_RIGHT_TO_LEFT) || 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (property == U_RIGHT_TO_LEFT_ARABIC) || 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (property == U_RIGHT_TO_LEFT_EMBEDDING) || 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (property == U_RIGHT_TO_LEFT_OVERRIDE)) { 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return RIGHT_TO_LEFT; 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if ((property == U_LEFT_TO_RIGHT) || 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (property == U_LEFT_TO_RIGHT_EMBEDDING) || 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (property == U_LEFT_TO_RIGHT_OVERRIDE)) { 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return LEFT_TO_RIGHT; 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position = next_position; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return LEFT_TO_RIGHT; 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(OS_WIN) 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AdjustStringForLocaleDirection(string16* text) { 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!IsRTL() || text->empty()) 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Marking the string as LTR if the locale is RTL and the string does not 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // contain strong RTL characters. Otherwise, mark the string as RTL. 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool has_rtl_chars = StringContainsStrongRTLChars(*text); 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!has_rtl_chars) 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WrapStringWithLTRFormatting(text); 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WrapStringWithRTLFormatting(text); 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool UnadjustStringForLocaleDirection(string16* text) { 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!IsRTL() || text->empty()) 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *text = StripWrappingBidiControlCharacters(*text); 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AdjustStringForLocaleDirection(string16* text) { 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // On OS X & GTK the directionality of a label is determined by the first 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // strongly directional character. 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // However, we want to make sure that in an LTR-language-UI all strings are 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // left aligned and vice versa. 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // A problem can arise if we display a string which starts with user input. 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // User input may be of the opposite directionality to the UI. So the whole 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // string will be displayed in the opposite directionality, e.g. if we want to 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // display in an LTR UI [such as US English]: 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // EMAN_NOISNETXE is now installed. 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Since EXTENSION_NAME begins with a strong RTL char, the label's 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // directionality will be set to RTL and the string will be displayed visually 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // as: 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // .is now installed EMAN_NOISNETXE 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // In order to solve this issue, we prepend an LRM to the string. An LRM is a 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // strongly directional LTR char. 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We also append an LRM at the end, which ensures that we're in an LTR 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // context. 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Unlike Windows, Linux and OS X can correctly display RTL glyphs out of the 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // box so there is no issue with displaying zero-width bidi control characters 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // on any system. Thus no need for the !IsRTL() check here. 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text->empty()) 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ui_direction_is_rtl = IsRTL(); 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool has_rtl_chars = StringContainsStrongRTLChars(*text); 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!ui_direction_is_rtl && has_rtl_chars) { 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WrapStringWithRTLFormatting(text); 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->insert(0U, 1U, kLeftToRightMark); 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->push_back(kLeftToRightMark); 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (ui_direction_is_rtl && has_rtl_chars) { 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WrapStringWithRTLFormatting(text); 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->insert(0U, 1U, kRightToLeftMark); 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->push_back(kRightToLeftMark); 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (ui_direction_is_rtl) { 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WrapStringWithLTRFormatting(text); 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->insert(0U, 1U, kRightToLeftMark); 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->push_back(kRightToLeftMark); 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool UnadjustStringForLocaleDirection(string16* text) { 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text->empty()) 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t begin_index = 0; 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char16 begin = text->at(begin_index); 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (begin == kLeftToRightMark || 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) begin == kRightToLeftMark) { 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++begin_index; 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t end_index = text->length() - 1; 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char16 end = text->at(end_index); 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (end == kLeftToRightMark || 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) end == kRightToLeftMark) { 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) --end_index; 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string16 unmarked_text = 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->substr(begin_index, end_index - begin_index + 1); 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *text = StripWrappingBidiControlCharacters(unmarked_text); 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // !OS_WIN 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool StringContainsStrongRTLChars(const string16& text) { 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const UChar* string = text.c_str(); 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t length = text.length(); 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t position = 0; 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (position < length) { 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) UChar32 character; 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t next_position = position; 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) U16_NEXT(string, next_position, length, character); 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Now that we have the character, we use ICU in order to query for the 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // appropriate Unicode BiDi character type. 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int32_t property = u_getIntPropertyValue(character, UCHAR_BIDI_CLASS); 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((property == U_RIGHT_TO_LEFT) || (property == U_RIGHT_TO_LEFT_ARABIC)) 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position = next_position; 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WrapStringWithLTRFormatting(string16* text) { 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text->empty()) 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inserting an LRE (Left-To-Right Embedding) mark as the first character. 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->insert(0U, 1U, kLeftToRightEmbeddingMark); 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inserting a PDF (Pop Directional Formatting) mark as the last character. 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->push_back(kPopDirectionalFormatting); 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WrapStringWithRTLFormatting(string16* text) { 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text->empty()) 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inserting an RLE (Right-To-Left Embedding) mark as the first character. 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->insert(0U, 1U, kRightToLeftEmbeddingMark); 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inserting a PDF (Pop Directional Formatting) mark as the last character. 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text->push_back(kPopDirectionalFormatting); 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WrapPathWithLTRFormatting(const FilePath& path, 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string16* rtl_safe_path) { 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Wrap the overall path with LRE-PDF pair which essentialy marks the 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // string as a Left-To-Right string. 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inserting an LRE (Left-To-Right Embedding) mark as the first character. 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rtl_safe_path->push_back(kLeftToRightEmbeddingMark); 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(OS_MACOSX) 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rtl_safe_path->append(UTF8ToUTF16(path.value())); 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#elif defined(OS_WIN) 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rtl_safe_path->append(path.value()); 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else // defined(OS_POSIX) && !defined(OS_MACOSX) 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::wstring wide_path = base::SysNativeMBToWide(path.value()); 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rtl_safe_path->append(WideToUTF16(wide_path)); 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inserting a PDF (Pop Directional Formatting) mark as the last character. 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rtl_safe_path->push_back(kPopDirectionalFormatting); 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)string16 GetDisplayStringInLTRDirectionality(const string16& text) { 3225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Always wrap the string in RTL UI (it may be appended to RTL string). 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Also wrap strings with an RTL first strong character direction in LTR UI. 3245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (IsRTL() || GetFirstStrongCharacterDirection(text) == RIGHT_TO_LEFT) { 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string16 text_mutable(text); 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WrapStringWithLTRFormatting(&text_mutable); 3275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return text_mutable; 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return text; 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)string16 StripWrappingBidiControlCharacters(const string16& text) { 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text.empty()) 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return text; 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t begin_index = 0; 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char16 begin = text[begin_index]; 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (begin == kLeftToRightEmbeddingMark || 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) begin == kRightToLeftEmbeddingMark || 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) begin == kLeftToRightOverride || 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) begin == kRightToLeftOverride) 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++begin_index; 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t end_index = text.length() - 1; 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text[end_index] == kPopDirectionalFormatting) 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) --end_index; 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return text.substr(begin_index, end_index - begin_index + 1); 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace i18n 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 350