Upstream Chrome on iOS source code [10/11].

ios/chrome/browser/ui/util/unicode_util.h

+// Copyright 2015 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_UTIL_UNICODE_UTIL_H_
+#define IOS_CHROME_BROWSER_UI_UTIL_UNICODE_UTIL_H_
+
+#import <UIKit/UIKit.h>
+
+namespace unicode_util {
+
+// Returns true if |c| is a character with R or AL bidirectionality as specified
+// by RFC 3454.
+bool IsCharRTL(unichar c);
+
+// Returns true if |c| is a character with L bidirectionality as specified by
+// RFC 3454.
+bool IsCharLTR(unichar c);
+
+// Returns the writing direction for |string| based on rules P2 and P3 of the
+// Unicode BiDi Algorithm.  Returns NSWritingDirectionNatural for strings that
+// don't contain any bidirectionality information.
+NSWritingDirection UnicodeWritingDirectionForString(NSString* string);
+
+// Converts |string|'s characters to their unicode encodings (i.e. "\u" followed
+// by 4 hex digits).  This is useful for creating string constants for RTL
+// languages without inducing RTL text layout when viewed in a text editor.
+NSString* GetEscapedUnicodeStringForString(NSString* string);
+
+}  // namespace unicode_util
+
+#endif  // IOS_CHROME_BROWSER_UI_UTIL_UNICODE_UTIL_H_