michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: #ifndef nsILineBreaker_h__
michael@0: #define nsILineBreaker_h__
michael@0: 
michael@0: #include "nsISupports.h"
michael@0: 
michael@0: #include "nscore.h"
michael@0: 
michael@0: #define NS_LINEBREAKER_NEED_MORE_TEXT -1
michael@0: 
michael@0: // 	{0x4b0b9e04-6ffb-4647-aa5f-2fa2ebd883e8}
michael@0: #define NS_ILINEBREAKER_IID \
michael@0: {0x4b0b9e04, 0x6ffb, 0x4647, \
michael@0:     {0xaa, 0x5f, 0x2f, 0xa2, 0xeb, 0xd8, 0x83, 0xe8}}
michael@0: 
michael@0: class nsILineBreaker : public nsISupports
michael@0: {
michael@0: public:
michael@0:   NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINEBREAKER_IID)
michael@0: 
michael@0:   enum {
michael@0:     kWordBreak_Normal   = 0, // default
michael@0:     kWordBreak_BreakAll = 1, // break all
michael@0:     kWordBreak_KeepAll  = 2  // always keep 
michael@0:   };
michael@0: 
michael@0:   virtual int32_t Next( const char16_t* aText, uint32_t aLen, 
michael@0:                         uint32_t aPos) = 0;
michael@0: 
michael@0:   virtual int32_t Prev( const char16_t* aText, uint32_t aLen, 
michael@0:                         uint32_t aPos) = 0;
michael@0: 
michael@0:   // Call this on a word with whitespace at either end. We will apply JISx4051
michael@0:   // rules to find breaks inside the word. aBreakBefore is set to the break-
michael@0:   // before status of each character; aBreakBefore[0] will always be false
michael@0:   // because we never return a break before the first character.
michael@0:   // aLength is the length of the aText array and also the length of the aBreakBefore
michael@0:   // output array.
michael@0:   virtual void GetJISx4051Breaks(const char16_t* aText, uint32_t aLength,
michael@0:                                  uint8_t aWordBreak,
michael@0:                                  uint8_t* aBreakBefore) = 0;
michael@0:   virtual void GetJISx4051Breaks(const uint8_t* aText, uint32_t aLength,
michael@0:                                  uint8_t aWordBreak,
michael@0:                                  uint8_t* aBreakBefore) = 0;
michael@0: };
michael@0: 
michael@0: NS_DEFINE_STATIC_IID_ACCESSOR(nsILineBreaker, NS_ILINEBREAKER_IID)
michael@0: 
michael@0: static inline bool
michael@0: NS_IsSpace(char16_t u)
michael@0: {
michael@0:   return u == 0x0020 ||                  // SPACE
michael@0:          u == 0x0009 ||                  // CHARACTER TABULATION
michael@0:          u == 0x000D ||                  // CARRIAGE RETURN
michael@0:          u == 0x1680 ||                  // OGHAM SPACE MARK
michael@0:          (0x2000 <= u && u <= 0x2006) || // EN QUAD, EM QUAD, EN SPACE,
michael@0:                                          // EM SPACE, THREE-PER-EM SPACE,
michael@0:                                          // FOUR-PER-SPACE, SIX-PER-EM SPACE,
michael@0:          (0x2008 <= u && u <= 0x200B) || // PUNCTUATION SPACE, THIN SPACE,
michael@0:                                          // HAIR SPACE, ZERO WIDTH SPACE
michael@0:          u == 0x205F;                    // MEDIUM MATHEMATICAL SPACE 
michael@0: }
michael@0: 
michael@0: static inline bool
michael@0: NS_NeedsPlatformNativeHandling(char16_t aChar)
michael@0: {
michael@0:   return (0x0e01 <= aChar && aChar <= 0x0fff) || // Thai, Lao, Tibetan
michael@0:          (0x1780 <= aChar && aChar <= 0x17ff);   // Khmer
michael@0: }
michael@0: 
michael@0: #endif  /* nsILineBreaker_h__ */