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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : #ifndef nsILineBreaker_h__
       6             : #define nsILineBreaker_h__
       7             : 
       8             : #include "nsISupports.h"
       9             : 
      10             : #include "nscore.h"
      11             : 
      12             : #define NS_LINEBREAKER_NEED_MORE_TEXT -1
      13             : 
      14             : //      {0x4b0b9e04-6ffb-4647-aa5f-2fa2ebd883e8}
      15             : #define NS_ILINEBREAKER_IID \
      16             : {0x4b0b9e04, 0x6ffb, 0x4647, \
      17             :     {0xaa, 0x5f, 0x2f, 0xa2, 0xeb, 0xd8, 0x83, 0xe8}}
      18             : 
      19           3 : class nsILineBreaker : public nsISupports
      20             : {
      21             : public:
      22             :   NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINEBREAKER_IID)
      23             : 
      24             :   enum {
      25             :     kWordBreak_Normal   = 0, // default
      26             :     kWordBreak_BreakAll = 1, // break all
      27             :     kWordBreak_KeepAll  = 2  // always keep
      28             :   };
      29             : 
      30             :   virtual int32_t Next( const char16_t* aText, uint32_t aLen,
      31             :                         uint32_t aPos) = 0;
      32             : 
      33             :   virtual int32_t Prev( const char16_t* aText, uint32_t aLen,
      34             :                         uint32_t aPos) = 0;
      35             : 
      36             :   // Call this on a word with whitespace at either end. We will apply JISx4051
      37             :   // rules to find breaks inside the word. aBreakBefore is set to the break-
      38             :   // before status of each character; aBreakBefore[0] will always be false
      39             :   // because we never return a break before the first character.
      40             :   // aLength is the length of the aText array and also the length of the aBreakBefore
      41             :   // output array.
      42             :   virtual void GetJISx4051Breaks(const char16_t* aText, uint32_t aLength,
      43             :                                  uint8_t aWordBreak,
      44             :                                  uint8_t* aBreakBefore) = 0;
      45             :   virtual void GetJISx4051Breaks(const uint8_t* aText, uint32_t aLength,
      46             :                                  uint8_t aWordBreak,
      47             :                                  uint8_t* aBreakBefore) = 0;
      48             : };
      49             : 
      50             : NS_DEFINE_STATIC_IID_ACCESSOR(nsILineBreaker, NS_ILINEBREAKER_IID)
      51             : 
      52             : static inline bool
      53         301 : NS_IsSpace(char16_t u)
      54             : {
      55         289 :   return u == 0x0020 ||                  // SPACE
      56         289 :          u == 0x0009 ||                  // CHARACTER TABULATION
      57         289 :          u == 0x000D ||                  // CARRIAGE RETURN
      58         289 :          u == 0x1680 ||                  // OGHAM SPACE MARK
      59         578 :          (0x2000 <= u && u <= 0x2006) || // EN QUAD, EM QUAD, EN SPACE,
      60             :                                          // EM SPACE, THREE-PER-EM SPACE,
      61             :                                          // FOUR-PER-SPACE, SIX-PER-EM SPACE,
      62         590 :          (0x2008 <= u && u <= 0x200B) || // PUNCTUATION SPACE, THIN SPACE,
      63             :                                          // HAIR SPACE, ZERO WIDTH SPACE
      64         301 :          u == 0x205F;                    // MEDIUM MATHEMATICAL SPACE
      65             : }
      66             : 
      67             : static inline bool
      68           0 : NS_NeedsPlatformNativeHandling(char16_t aChar)
      69             : {
      70           0 :   return (0x0e01 <= aChar && aChar <= 0x0fff) || // Thai, Lao, Tibetan
      71           0 :          (0x1780 <= aChar && aChar <= 0x17ff);   // Khmer
      72             : }
      73             : 
      74             : #endif  /* nsILineBreaker_h__ */