1 files changed, 41 insertions, 0 deletions
diff --git a/app/bidi_line_iterator.h b/app/bidi_line_iterator.h
new file mode 100644
index 0000000..5f2f7e0
--- /dev/null
+++ b/app/bidi_line_iterator.h
@@ -0,0 +1,41 @@
+// Copyright (c) 2010 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 APP_BIDI_LINE_ITERATOR_H_
+#define APP_BIDI_LINE_ITERATOR_H_
+
+#include <string>
+
+#include "unicode/ubidi.h"
+
+#include "base/basictypes.h"
+
+// A simple wrapper class for the bidirectional iterator of ICU.
+// This class uses the bidirectional iterator of ICU to split a line of
+// bidirectional texts into visual runs in its display order.
+class BiDiLineIterator {
+ public:
+  BiDiLineIterator() : bidi_(NULL) { }
+  ~BiDiLineIterator();
+
+  // Initializes the bidirectional iterator with the specified text.  Returns
+  // whether initialization succeeded.
+  UBool Open(const std::wstring& text, bool right_to_left, bool url);
+
+  // Returns the number of visual runs in the text, or zero on error.
+  int CountRuns();
+
+  // Gets the logical offset, length, and direction of the specified visual run.
+  UBiDiDirection GetVisualRun(int index, int* start, int* length);
+
+  // Given a start position, figure out where the run ends (and the BiDiLevel).
+  void GetLogicalRun(int start, int* end, UBiDiLevel* level);
+
+ private:
+  UBiDi* bidi_;
+
+  DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator);
+};
+
+#endif  // APP_BIDI_LINE_ITERATOR_H_