icuSources/common/ubidi_props.h

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 2004-2013, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  ubidi_props.h
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 *
  13 *   created on: 2004dec30
  14 *   created by: Markus W. Scherer
  15 *
  16 *   Low-level Unicode bidi/shaping properties access.
  17 */
  18
  19 #ifndef __UBIDI_PROPS_H__
  20 #define __UBIDI_PROPS_H__
  21
  22 #include "unicode/utypes.h"
  23 #include "unicode/uset.h"
  24 #include "putilimp.h"
  25 #include "uset_imp.h"
  26 #include "udataswp.h"
  27
  28 U_CDECL_BEGIN
  29
  30 /* library API -------------------------------------------------------------- */
  31
  32 struct UBiDiProps;
  33 typedef struct UBiDiProps UBiDiProps;
  34
  35 U_CFUNC const UBiDiProps *
  36 ubidi_getSingleton(void);
  37
  38 U_CFUNC void
  39 ubidi_addPropertyStarts(const UBiDiProps *bdp, const USetAdder *sa, UErrorCode *pErrorCode);
  40
  41 /* property access functions */
  42
  43 U_CFUNC int32_t
  44 ubidi_getMaxValue(const UBiDiProps *bdp, UProperty which);
  45
  46 U_CAPI UCharDirection
  47 ubidi_getClass(const UBiDiProps *bdp, UChar32 c);
  48
  49 U_CFUNC UBool
  50 ubidi_isMirrored(const UBiDiProps *bdp, UChar32 c);
  51
  52 U_CFUNC UChar32
  53 ubidi_getMirror(const UBiDiProps *bdp, UChar32 c);
  54
  55 U_CFUNC UBool
  56 ubidi_isBidiControl(const UBiDiProps *bdp, UChar32 c);
  57
  58 U_CFUNC UBool
  59 ubidi_isJoinControl(const UBiDiProps *bdp, UChar32 c);
  60
  61 U_CFUNC UJoiningType
  62 ubidi_getJoiningType(const UBiDiProps *bdp, UChar32 c);
  63
  64 U_CFUNC UJoiningGroup
  65 ubidi_getJoiningGroup(const UBiDiProps *bdp, UChar32 c);
  66
  67 U_CFUNC UBidiPairedBracketType
  68 ubidi_getPairedBracketType(const UBiDiProps *bdp, UChar32 c);
  69
  70 U_CFUNC UChar32
  71 ubidi_getPairedBracket(const UBiDiProps *bdp, UChar32 c);
  72
  73 /* file definitions --------------------------------------------------------- */
  74
  75 #define UBIDI_DATA_NAME "ubidi"
  76 #define UBIDI_DATA_TYPE "icu"
  77
  78 /* format "BiDi" */
  79 #define UBIDI_FMT_0 0x42
  80 #define UBIDI_FMT_1 0x69
  81 #define UBIDI_FMT_2 0x44
  82 #define UBIDI_FMT_3 0x69
  83
  84 /* indexes into indexes[] */
  85 enum {
  86     UBIDI_IX_INDEX_TOP,
  87     UBIDI_IX_LENGTH,
  88     UBIDI_IX_TRIE_SIZE,
  89     UBIDI_IX_MIRROR_LENGTH,
  90
  91     UBIDI_IX_JG_START,
  92     UBIDI_IX_JG_LIMIT,
  93
  94     UBIDI_MAX_VALUES_INDEX=15,
  95     UBIDI_IX_TOP=16
  96 };
  97
  98 /* definitions for 16-bit bidi/shaping properties word ---------------------- */
  99
 100 enum {
 101  /* UBIDI_CLASS_SHIFT=0, */     /* bidi class: 5 bits (4..0) */
 102     UBIDI_JT_SHIFT=5,           /* joining type: 3 bits (7..5) */
 103
 104     UBIDI_BPT_SHIFT=8,          /* Bidi_Paired_Bracket_Type(bpt): 2 bits (9..8) */
 105
 106     UBIDI_JOIN_CONTROL_SHIFT=10,
 107     UBIDI_BIDI_CONTROL_SHIFT=11,
 108
 109     UBIDI_IS_MIRRORED_SHIFT=12,         /* 'is mirrored' */
 110     UBIDI_MIRROR_DELTA_SHIFT=13,        /* bidi mirroring delta: 3 bits (15..13) */
 111
 112     UBIDI_MAX_JG_SHIFT=16               /* max JG value in indexes[UBIDI_MAX_VALUES_INDEX] bits 23..16 */
 113 };
 114
 115 #define UBIDI_CLASS_MASK        0x0000001f
 116 #define UBIDI_JT_MASK           0x000000e0
 117 #define UBIDI_BPT_MASK          0x00000300
 118
 119 #define UBIDI_MAX_JG_MASK       0x00ff0000
 120
 121 #define UBIDI_GET_CLASS(props) ((props)&UBIDI_CLASS_MASK)
 122 #define UBIDI_GET_FLAG(props, shift) (((props)>>(shift))&1)
 123
 124 #if U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
 125 #   define UBIDI_GET_MIRROR_DELTA(props) ((int16_t)(props)>>UBIDI_MIRROR_DELTA_SHIFT)
 126 #else
 127 #   define UBIDI_GET_MIRROR_DELTA(props) (int16_t)(((props)&0x8000) ? (((props)>>UBIDI_MIRROR_DELTA_SHIFT)|0xe000) : ((props)>>UBIDI_MIRROR_DELTA_SHIFT))
 128 #endif
 129
 130 enum {
 131     UBIDI_ESC_MIRROR_DELTA=-4,
 132     UBIDI_MIN_MIRROR_DELTA=-3,
 133     UBIDI_MAX_MIRROR_DELTA=3
 134 };
 135
 136 /* definitions for 32-bit mirror table entry -------------------------------- */
 137
 138 enum {
 139     /* the source Unicode code point takes 21 bits (20..0) */
 140     UBIDI_MIRROR_INDEX_SHIFT=21,
 141     UBIDI_MAX_MIRROR_INDEX=0x7ff
 142 };
 143
 144 #define UBIDI_GET_MIRROR_CODE_POINT(m) (UChar32)((m)&0x1fffff)
 145
 146 #define UBIDI_GET_MIRROR_INDEX(m) ((m)>>UBIDI_MIRROR_INDEX_SHIFT)
 147
 148 U_CDECL_END
 149
 150 #endif