palemoon-dev/platform/intl/unicharutil/util/nsBidiUtils.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsBidiUtils_h__
#define nsBidiUtils_h__

#include "nsStringGlue.h"

   /**
    *  Read ftp://ftp.unicode.org/Public/UNIDATA/ReadMe-Latest.txt
    *  section BIDIRECTIONAL PROPERTIES
    *  for the detailed definition of the following categories
    *
    *  The values here must match the equivalents in %bidicategorycode in
    *  mozilla/intl/unicharutil/tools/genUnicodePropertyData.pl,
    *  and must also match the values used by ICU's UCharDirection.
    */

enum nsCharType   { 
  eCharType_LeftToRight              = 0, 
  eCharType_RightToLeft              = 1, 
  eCharType_EuropeanNumber           = 2,
  eCharType_EuropeanNumberSeparator  = 3,
  eCharType_EuropeanNumberTerminator = 4,
  eCharType_ArabicNumber             = 5,
  eCharType_CommonNumberSeparator    = 6,
  eCharType_BlockSeparator           = 7,
  eCharType_SegmentSeparator         = 8,
  eCharType_WhiteSpaceNeutral        = 9, 
  eCharType_OtherNeutral             = 10, 
  eCharType_LeftToRightEmbedding     = 11,
  eCharType_LeftToRightOverride      = 12,
  eCharType_RightToLeftArabic        = 13,
  eCharType_RightToLeftEmbedding     = 14,
  eCharType_RightToLeftOverride      = 15,
  eCharType_PopDirectionalFormat     = 16,
  eCharType_DirNonSpacingMark        = 17,
  eCharType_BoundaryNeutral          = 18,
  eCharType_FirstStrongIsolate       = 19,
  eCharType_LeftToRightIsolate       = 20,
  eCharType_RightToLeftIsolate       = 21,
  eCharType_PopDirectionalIsolate    = 22,
  eCharType_CharTypeCount
};

/**
 * This specifies the language directional property of a character set.
 */
typedef enum nsCharType nsCharType;

/**
 * Find the direction of an embedding level or paragraph level set by
 * the Unicode Bidi Algorithm. (Even levels are left-to-right, odd
 * levels right-to-left.
 */
#define IS_LEVEL_RTL(level) (((level) & 1) == 1)

/**
 * Check whether two bidi levels have the same parity and thus the same
 * directionality
 */
#define IS_SAME_DIRECTION(level1, level2) (((level1 ^ level2) & 1) == 0)

/**
 * Convert from nsBidiLevel to nsBidiDirection
 */
#define DIRECTION_FROM_LEVEL(level) ((IS_LEVEL_RTL(level)) \
   ? NSBIDI_RTL : NSBIDI_LTR)

/**
 * definitions of bidirection character types by category
 */

#define CHARTYPE_IS_RTL(val) ( ( (val) == eCharType_RightToLeft) || ( (val) == eCharType_RightToLeftArabic) )

#define CHARTYPE_IS_WEAK(val) ( ( (val) == eCharType_EuropeanNumberSeparator)    \
                           || ( (val) == eCharType_EuropeanNumberTerminator) \
                           || ( ( (val) > eCharType_ArabicNumber) && ( (val) != eCharType_RightToLeftArabic) ) )

  /**
   * Inspects a Unichar, converting numbers to Arabic or Hindi forms and returning them
   * @param aChar is the character
   * @param aPrevCharArabic is true if the previous character in the string is an Arabic char
   * @param aNumFlag specifies the conversion to perform:
   *        IBMBIDI_NUMERAL_NOMINAL:      don't do any conversion
   *        IBMBIDI_NUMERAL_HINDI:        convert to Hindi forms (Unicode 0660-0669)
   *        IBMBIDI_NUMERAL_ARABIC:       convert to Arabic forms (Unicode 0030-0039)
   *        IBMBIDI_NUMERAL_HINDICONTEXT: convert numbers in Arabic text to Hindi, otherwise to Arabic
   * @return the converted Unichar
   */
  char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag);

  /**
   * Scan a Unichar string, converting numbers to Arabic or Hindi forms in place
   * @param aBuffer is the string
   * @param aSize is the size of aBuffer
   * @param aNumFlag specifies the conversion to perform:
   *        IBMBIDI_NUMERAL_NOMINAL:      don't do any conversion
   *        IBMBIDI_NUMERAL_HINDI:        convert to Hindi forms (Unicode 0660-0669)
   *        IBMBIDI_NUMERAL_ARABIC:       convert to Arabic forms (Unicode 0030-0039)
   *        IBMBIDI_NUMERAL_HINDICONTEXT: convert numbers in Arabic text to Hindi, otherwise to Arabic
   */
  nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t  aNumFlag);

  /**
   * Give a UTF-32 codepoint
   * return true if the codepoint is a Bidi control character (LRM, RLM, ALM;
   * LRE, RLE, PDF, LRO, RLO; LRI, RLI, FSI, PDI).
   * Return false, otherwise
   */
#define LRM_CHAR 0x200e
#define RLM_CHAR 0x200f

#define LRE_CHAR 0x202a
#define RLE_CHAR 0x202b
#define PDF_CHAR 0x202c
#define LRO_CHAR 0x202d
#define RLO_CHAR 0x202e

#define LRI_CHAR 0x2066
#define RLI_CHAR 0x2067
#define FSI_CHAR 0x2068
#define PDI_CHAR 0x2069

#define ALM_CHAR 0x061C
   inline bool IsBidiControl(uint32_t aChar) {
     return ((LRE_CHAR <= aChar && aChar <= RLO_CHAR) ||
             (LRI_CHAR <= aChar && aChar <= PDI_CHAR) ||
             (aChar == ALM_CHAR) ||
             (aChar & 0xfffffe) == LRM_CHAR);
   }

  /**
   * Give a UTF-32 codepoint
   * Return true if the codepoint is a Bidi control character that may result
   * in RTL directionality and therefore needs to trigger bidi resolution;
   * return false otherwise.
   */
   inline bool IsBidiControlRTL(uint32_t aChar) {
     return aChar == RLM_CHAR ||
            aChar == RLE_CHAR ||
            aChar == RLO_CHAR ||
            aChar == RLI_CHAR ||
            aChar == ALM_CHAR;
   }

  /**
   * Give an nsString.
   * @return true if the string contains right-to-left characters
   */
   bool HasRTLChars(const nsAString& aString);

// These values are shared with Preferences dialog
//  ------------------
//  If Pref values are to be changed
//  in the XUL file of Prefs. the values
//  Must be changed here too..
//  ------------------
//
#define IBMBIDI_TEXTDIRECTION_STR       "bidi.direction"
#define IBMBIDI_TEXTTYPE_STR            "bidi.texttype"
#define IBMBIDI_NUMERAL_STR             "bidi.numeral"

//  ------------------
//  Text Direction
//  ------------------
//  bidi.direction
#define IBMBIDI_TEXTDIRECTION_LTR     1 //  1 = directionLTRBidi *
#define IBMBIDI_TEXTDIRECTION_RTL     2 //  2 = directionRTLBidi
//  ------------------
//  Text Type
//  ------------------
//  bidi.texttype
#define IBMBIDI_TEXTTYPE_CHARSET      1 //  1 = charsettexttypeBidi *
#define IBMBIDI_TEXTTYPE_LOGICAL      2 //  2 = logicaltexttypeBidi
#define IBMBIDI_TEXTTYPE_VISUAL       3 //  3 = visualtexttypeBidi
//  ------------------
//  Numeral Style
//  ------------------
//  bidi.numeral
#define IBMBIDI_NUMERAL_NOMINAL       0 //  0 = nominalnumeralBidi *
#define IBMBIDI_NUMERAL_REGULAR       1 //  1 = regularcontextnumeralBidi
#define IBMBIDI_NUMERAL_HINDICONTEXT  2 //  2 = hindicontextnumeralBidi
#define IBMBIDI_NUMERAL_ARABIC        3 //  3 = arabicnumeralBidi
#define IBMBIDI_NUMERAL_HINDI         4 //  4 = hindinumeralBidi
#define IBMBIDI_NUMERAL_PERSIANCONTEXT 5 // 5 = persiancontextnumeralBidi
#define IBMBIDI_NUMERAL_PERSIAN       6 //  6 = persiannumeralBidi

#define IBMBIDI_DEFAULT_BIDI_OPTIONS              \
        ((IBMBIDI_TEXTDIRECTION_LTR<<0)         | \
         (IBMBIDI_TEXTTYPE_CHARSET<<4)          | \
         (IBMBIDI_NUMERAL_NOMINAL<<8))

#define GET_BIDI_OPTION_DIRECTION(bo) (((bo)>>0) & 0x0000000F) /* 4 bits for DIRECTION */
#define GET_BIDI_OPTION_TEXTTYPE(bo) (((bo)>>4) & 0x0000000F) /* 4 bits for TEXTTYPE */
#define GET_BIDI_OPTION_NUMERAL(bo) (((bo)>>8) & 0x0000000F) /* 4 bits for NUMERAL */

#define SET_BIDI_OPTION_DIRECTION(bo, dir) {(bo)=((bo) & 0xFFFFFFF0)|(((dir)& 0x0000000F)<<0);}
#define SET_BIDI_OPTION_TEXTTYPE(bo, tt) {(bo)=((bo) & 0xFFFFFF0F)|(((tt)& 0x0000000F)<<4);}
#define SET_BIDI_OPTION_NUMERAL(bo, num) {(bo)=((bo) & 0xFFFFF0FF)|(((num)& 0x0000000F)<<8);}

/* Constants related to the position of numerics in the codepage */
#define START_HINDI_DIGITS              0x0660
#define END_HINDI_DIGITS                0x0669
#define START_ARABIC_DIGITS             0x0030
#define END_ARABIC_DIGITS               0x0039
#define START_FARSI_DIGITS              0x06f0
#define END_FARSI_DIGITS                0x06f9
#define IS_HINDI_DIGIT(u)   ( ( (u) >= START_HINDI_DIGITS )  && ( (u) <= END_HINDI_DIGITS ) )
#define IS_ARABIC_DIGIT(u)  ( ( (u) >= START_ARABIC_DIGITS ) && ( (u) <= END_ARABIC_DIGITS ) )
#define IS_FARSI_DIGIT(u)  ( ( (u) >= START_FARSI_DIGITS ) && ( (u) <= END_FARSI_DIGITS ) )
/**
 * Arabic numeric separator and numeric formatting characters:
 *  U+0600;ARABIC NUMBER SIGN
 *  U+0601;ARABIC SIGN SANAH
 *  U+0602;ARABIC FOOTNOTE MARKER
 *  U+0603;ARABIC SIGN SAFHA
 *  U+066A;ARABIC PERCENT SIGN
 *  U+066B;ARABIC DECIMAL SEPARATOR
 *  U+066C;ARABIC THOUSANDS SEPARATOR
 *  U+06DD;ARABIC END OF AYAH
 */
#define IS_ARABIC_SEPARATOR(u) ( ( /*(u) >= 0x0600 &&*/ (u) <= 0x0603 ) || \
                                 ( (u) >= 0x066A && (u) <= 0x066C ) || \
                                 ( (u) == 0x06DD ) )

#define IS_BIDI_DIACRITIC(u) ( \
  ( (u) >= 0x0591 && (u) <= 0x05A1) || ( (u) >= 0x05A3 && (u) <= 0x05B9) \
    || ( (u) >= 0x05BB && (u) <= 0x05BD) || ( (u) == 0x05BF) || ( (u) == 0x05C1) \
    || ( (u) == 0x05C2) || ( (u) == 0x05C4) \
    || ( (u) >= 0x064B && (u) <= 0x0652) || ( (u) == 0x0670) \
    || ( (u) >= 0x06D7 && (u) <= 0x06E4) || ( (u) == 0x06E7) || ( (u) == 0x06E8) \
    || ( (u) >= 0x06EA && (u) <= 0x06ED) )

#define IS_HEBREW_CHAR(c) (((0x0590 <= (c)) && ((c) <= 0x05FF)) || (((c) >= 0xfb1d) && ((c) <= 0xfb4f)))
#define IS_ARABIC_CHAR(c) ( (0x0600 <= (c) && (c) <= 0x08FF) &&   \
                            ( (c) <= 0x06ff ||                    \
                              ((c) >= 0x0750 && (c) <= 0x077f) || \
                              (c) >= 0x08a0 ) )
#define IS_ARABIC_ALPHABETIC(c) (IS_ARABIC_CHAR(c) && \
                                !(IS_HINDI_DIGIT(c) || IS_FARSI_DIGIT(c) || IS_ARABIC_SEPARATOR(c)))

/**
 * The codepoint ranges in the following macros are based on the blocks
 *  allocated, or planned to be allocated, to right-to-left characters in the
 *  BMP (Basic Multilingual Plane) and SMP (Supplementary Multilingual Plane)
 *  according to
 *  http://unicode.org/Public/UNIDATA/extracted/DerivedBidiClass.txt and
 *  http://www.unicode.org/roadmaps/
 */

#define IS_IN_BMP_RTL_BLOCK(c) ((0x590 <= (c)) && ((c) <= 0x8ff))
#define IS_RTL_PRESENTATION_FORM(c) (((0xfb1d <= (c)) && ((c) <= 0xfdff)) || \
                                     ((0xfe70 <= (c)) && ((c) <= 0xfefc)))
#define IS_IN_SMP_RTL_BLOCK(c) (((0x10800 <= (c)) && ((c) <= 0x10fff)) || \
                                ((0x1e800 <= (c)) && ((c) <= 0x1eFFF)))
#define UCS2_CHAR_IS_BIDI(c) ((IS_IN_BMP_RTL_BLOCK(c)) || \
                              (IS_RTL_PRESENTATION_FORM(c)) || \
                              (c) == 0xD802 || (c) == 0xD803)
#define UTF32_CHAR_IS_BIDI(c)  ((IS_IN_BMP_RTL_BLOCK(c)) || \
                               (IS_RTL_PRESENTATION_FORM(c)) || \
                               (IS_IN_SMP_RTL_BLOCK(c)))
#endif  /* nsBidiUtils_h__ */