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49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_I18N_CASE_CONVERSION_H_
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#define BASE_I18N_CASE_CONVERSION_H_
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#include "base/i18n/base_i18n_export.h"
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#include "base/strings/string16.h"
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#include "base/strings/string_piece.h"
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namespace base {
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namespace i18n {
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// UNICODE CASE-HANDLING ADVICE
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//
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// In English it's always safe to convert to upper-case or lower-case text
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// and get a good answer. But some languages have rules specific to those
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// locales. One example is the Turkish I:
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// http://www.i18nguy.com/unicode/turkish-i18n.html
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//
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// ToLower/ToUpper use the current ICU locale which will take into account
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// the user language preference. Use this when dealing with user typing.
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//
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// FoldCase canonicalizes to a standardized form independent of the current
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// locale. Use this when comparing general Unicode strings that don't
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// necessarily belong in the user's current locale (like commands, protocol
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// names, other strings from the web) for case-insensitive equality.
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//
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// Note that case conversions will change the length of the string in some
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// not-uncommon cases. Never assume that the output is the same length as
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// the input.
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// Returns the lower case equivalent of string. Uses ICU's current locale.
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BASE_I18N_EXPORT string16 ToLower(StringPiece16 string);
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// Returns the upper case equivalent of string. Uses ICU's current locale.
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BASE_I18N_EXPORT string16 ToUpper(StringPiece16 string);
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// Convert the given string to a canonical case, independent of the current
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// locale. For ASCII the canonical form is lower case.
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// See http://unicode.org/faq/casemap_charprop.html#2
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BASE_I18N_EXPORT string16 FoldCase(StringPiece16 string);
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} // namespace i18n
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} // namespace base
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#endif // BASE_I18N_CASE_CONVERSION_H_
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