Make 'dangerous download warning' visible in Japanese UI on Windows.

base/i18n/break_iterator.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef BASE_I18N_BREAK_ITERATOR_H_
 #define BASE_I18N_BREAK_ITERATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 
 // The BreakIterator class iterates through the words, word breaks, and
 // line breaks in a UTF-16 string.
 //
-// It provides several modes, BREAK_WORD, BREAK_SPACE, and BREAK_NEWLINE,
+// It provides several modes, BREAK_WORD, BREAK_LINE, and BREAK_NEWLINE,
 // which modify how characters are aggregated into the returned string.
 //
 // Under BREAK_WORD mode, once a word is encountered any non-word
 // characters are not included in the returned string (e.g. in the
 // UTF-16 equivalent of the string " foo bar! ", the word breaks are at
 // the periods in ". .foo. .bar.!. .").
+// Note that Chinese/Japanese/Thai do not use spaces between words so that
+// boundaries can fall in the middle of a continuous run of non-space /
+// non-punctuation characters.
 //
-// Under BREAK_SPACE mode, once a word is encountered, any non-word
-// characters are included in the returned string, breaking only when a
-// space-equivalent character is encountered (e.g. in the
-// UTF16-equivalent of the string " foo bar! ", the word breaks are at
-//   the periods in ". .foo .bar! .").
+// Under BREAK_LINE mode, once a line breaking opportunity is encountered,
+// any non-word  characters are included in the returned string, breaking
+// only when a space-equivalent character or a line breaking opportunity
+// is encountered (e.g. in the UTF16-equivalent of the string " foo bar! ",
+// the breaks are at the periods in ". .foo .bar! .").
+//
+// Note that lines can be broken at any character/syllable/grapheme cluster
+// boundary in Chinese/Japanese/Korean and at word boundaries in Thai
+// (Thai does not use spaces between words). Therefore, this is NOT the same
+// as breaking only at space-equivalent characters where its former
+// name (BREAK_SPACE) implied.
 //
 // Under BREAK_NEWLINE mode, all characters are included in the returned
 // string, breking only when a newline-equivalent character is encountered
 // (eg. in the UTF-16 equivalent of the string "foo\nbar!\n\n", the line
 // breaks are at the periods in ".foo\n.bar\n.\n.").
 //
 // To extract the words from a string, move a BREAK_WORD BreakIterator
 // through the string and test whether IsWord() is true.  E.g.,
 //   BreakIterator iter(&str, BreakIterator::BREAK_WORD);
 //   if (!iter.Init()) return false;
 //   while (iter.Advance()) {
 //     if (iter.IsWord()) {
 //       // region [iter.prev(),iter.pos()) contains a word.
 //       VLOG(1) << "word: " << iter.GetString();
 //     }
 //   }
 
 namespace base {
 
 class BreakIterator {
  public:
   enum BreakType {
     BREAK_WORD,
-    BREAK_SPACE,
+    BREAK_LINE,
+    // TODO(jshin): Remove this after reviewing call sites.
+    // If call sites really need break only on space-like characters
+    // implement it separately.
+    BREAK_SPACE = BREAK_LINE,
     BREAK_NEWLINE,
   };
 
   // Requires |str| to live as long as the BreakIterator does.
   BreakIterator(const string16* str, BreakType break_type);
   ~BreakIterator();
 
   // Init() must be called before any of the iterators are valid.
   // Returns false if ICU failed to initialize.
   bool Init();
 
   // Return the current break position within the string,
   // or BreakIterator::npos when done.
   size_t pos() const { return pos_; }
 
   // Return the value of pos() returned before Advance() was last called.
   size_t prev() const { return prev_; }
 
   // Advance to the next break.  Returns false if we've run past the end of
   // the string.  (Note that the very last "break" is after the final
   // character in the string, and when we advance to that position it's the
   // last time Advance() returns true.)
   bool Advance();
 
   // Under BREAK_WORD mode, returns true if the break we just hit is the
   // end of a word. (Otherwise, the break iterator just skipped over e.g.
-  // whitespace or punctuation.)  Under BREAK_SPACE and BREAK_NEWLINE modes,
+  // whitespace or punctuation.)  Under BREAK_LINE and BREAK_NEWLINE modes,
   // this distinction doesn't apply and it always retuns false.
   bool IsWord() const;
 
   // Return the string between prev() and pos().
   // Advance() must have been called successfully at least once
   // for pos() to have advanced to somewhere useful.
   string16 GetString() const;
 
  private:
   // ICU iterator, avoiding ICU ubrk.h dependence.
@@ skipping 10 matching lines @@
 
   // Previous and current iterator positions.
   size_t prev_, pos_;
 
   DISALLOW_COPY_AND_ASSIGN(BreakIterator);
 };
 
 }  // namespace base
 
 #endif  // BASE_I18N_BREAK_ITERATOR_H__