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awtk/3rd/fribidi/fribidi-bidi-types.h
lixianjing 76b0955cd0 support unicode bidirectional algorithm
2020-07-09 17:05:21 +08:00

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/* FriBidi
* fribidi-bidi-types.h - character bidi types
*
* Author:
* Behdad Esfahbod, 2001, 2002, 2004
*
* Copyright (C) 2004 Sharif FarsiWeb, Inc.
* Copyright (C) 2001,2002 Behdad Esfahbod
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library, in a file named COPYING; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA
*
* For licensing issues, contact <fribidi.license@gmail.com>.
*/
#ifndef _FRIBIDI_BIDI_TYPES_H
#define _FRIBIDI_BIDI_TYPES_H
#include "fribidi-common.h"
#include "fribidi-types.h"
#include "fribidi-begindecls.h"
typedef signed char FriBidiLevel;
/*
* Define bit masks that bidi types are based on, each mask has
* only one bit set.
*/
/* RTL mask better be the least significant bit. */
#define FRIBIDI_MASK_RTL 0x00000001L /* Is right to left */
#define FRIBIDI_MASK_ARABIC 0x00000002L /* Is arabic */
/* Each char can be only one of the three following. */
#define FRIBIDI_MASK_STRONG 0x00000010L /* Is strong */
#define FRIBIDI_MASK_WEAK 0x00000020L /* Is weak */
#define FRIBIDI_MASK_NEUTRAL 0x00000040L /* Is neutral */
#define FRIBIDI_MASK_SENTINEL 0x00000080L /* Is sentinel */
/* Sentinels are not valid chars, just identify the start/end of strings. */
/* Each char can be only one of the six following. */
#define FRIBIDI_MASK_LETTER 0x00000100L /* Is letter: L, R, AL */
#define FRIBIDI_MASK_NUMBER 0x00000200L /* Is number: EN, AN */
#define FRIBIDI_MASK_NUMSEPTER 0x00000400L /* Is separator or terminator: ES, ET, CS */
#define FRIBIDI_MASK_SPACE 0x00000800L /* Is space: BN, BS, SS, WS */
#define FRIBIDI_MASK_EXPLICIT 0x00001000L /* Is explicit mark: LRE, RLE, LRO, RLO, PDF */
#define FRIBIDI_MASK_ISOLATE 0x00008000L /* Is isolate mark: LRI, RLI, FSI, PDI */
/* Can be set only if FRIBIDI_MASK_SPACE is also set. */
#define FRIBIDI_MASK_SEPARATOR 0x00002000L /* Is text separator: BS, SS */
/* Can be set only if FRIBIDI_MASK_EXPLICIT is also set. */
#define FRIBIDI_MASK_OVERRIDE 0x00004000L /* Is explicit override: LRO, RLO */
#define FRIBIDI_MASK_FIRST 0x02000000L /* Whether direction is determined by first strong */
/* The following exist to make types pairwise different, some of them can
* be removed but are here because of efficiency (make queries faster). */
#define FRIBIDI_MASK_ES 0x00010000L
#define FRIBIDI_MASK_ET 0x00020000L
#define FRIBIDI_MASK_CS 0x00040000L
#define FRIBIDI_MASK_NSM 0x00080000L
#define FRIBIDI_MASK_BN 0x00100000L
#define FRIBIDI_MASK_BS 0x00200000L
#define FRIBIDI_MASK_SS 0x00400000L
#define FRIBIDI_MASK_WS 0x00800000L
/* We reserve a single bit for user's private use: we will never use it. */
#define FRIBIDI_MASK_PRIVATE 0x01000000L
/*
* Define values for FriBidiCharType
*/
/* Strong types */
/* Left-To-Right letter */
#define FRIBIDI_TYPE_LTR_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_LETTER )
/* Right-To-Left letter */
#define FRIBIDI_TYPE_RTL_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_LETTER \
| FRIBIDI_MASK_RTL)
/* Arabic Letter */
#define FRIBIDI_TYPE_AL_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_LETTER \
| FRIBIDI_MASK_RTL | FRIBIDI_MASK_ARABIC )
/* Left-to-Right Embedding */
#define FRIBIDI_TYPE_LRE_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_EXPLICIT)
/* Right-to-Left Embedding */
#define FRIBIDI_TYPE_RLE_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_EXPLICIT \
| FRIBIDI_MASK_RTL )
/* Left-to-Right Override */
#define FRIBIDI_TYPE_LRO_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_EXPLICIT \
| FRIBIDI_MASK_OVERRIDE )
/* Right-to-Left Override */
#define FRIBIDI_TYPE_RLO_VAL ( FRIBIDI_MASK_STRONG | FRIBIDI_MASK_EXPLICIT \
| FRIBIDI_MASK_RTL | FRIBIDI_MASK_OVERRIDE )
/* Weak types */
/* Pop Directional Flag*/
#define FRIBIDI_TYPE_PDF_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_EXPLICIT )
/* European Numeral */
#define FRIBIDI_TYPE_EN_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_NUMBER )
/* Arabic Numeral */
#define FRIBIDI_TYPE_AN_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_NUMBER \
| FRIBIDI_MASK_ARABIC )
/* European number Separator */
#define FRIBIDI_TYPE_ES_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_NUMSEPTER \
| FRIBIDI_MASK_ES )
/* European number Terminator */
#define FRIBIDI_TYPE_ET_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_NUMSEPTER \
| FRIBIDI_MASK_ET )
/* Common Separator */
#define FRIBIDI_TYPE_CS_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_NUMSEPTER \
| FRIBIDI_MASK_CS )
/* Non Spacing Mark */
#define FRIBIDI_TYPE_NSM_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_NSM )
/* Boundary Neutral */
#define FRIBIDI_TYPE_BN_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_SPACE \
| FRIBIDI_MASK_BN )
/* Neutral types */
/* Block Separator */
#define FRIBIDI_TYPE_BS_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_SPACE \
| FRIBIDI_MASK_SEPARATOR | FRIBIDI_MASK_BS )
/* Segment Separator */
#define FRIBIDI_TYPE_SS_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_SPACE \
| FRIBIDI_MASK_SEPARATOR | FRIBIDI_MASK_SS )
/* WhiteSpace */
#define FRIBIDI_TYPE_WS_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_SPACE \
| FRIBIDI_MASK_WS )
/* Other Neutral */
#define FRIBIDI_TYPE_ON_VAL ( FRIBIDI_MASK_NEUTRAL )
/* The following are used in specifying paragraph direction only. */
/* Weak Left-To-Right */
#define FRIBIDI_TYPE_WLTR_VAL ( FRIBIDI_MASK_WEAK )
/* Weak Right-To-Left */
#define FRIBIDI_TYPE_WRTL_VAL ( FRIBIDI_MASK_WEAK | FRIBIDI_MASK_RTL )
/* start or end of text (run list) SENTINEL. Only used internally */
#define FRIBIDI_TYPE_SENTINEL ( FRIBIDI_MASK_SENTINEL )
/* Private types for applications. More private types can be obtained by
* summing up from this one. */
#define FRIBIDI_TYPE_PRIVATE ( FRIBIDI_MASK_PRIVATE )
/* New types in Unicode 6.3 */
/* Left-to-Right Isolate */
#define FRIBIDI_TYPE_LRI_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_ISOLATE )
/* Right-to-Left Isolate */
#define FRIBIDI_TYPE_RLI_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_ISOLATE | FRIBIDI_MASK_RTL )
/* First strong isolate */
#define FRIBIDI_TYPE_FSI_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_ISOLATE | FRIBIDI_MASK_FIRST )
/* Pop Directional Isolate*/
#define FRIBIDI_TYPE_PDI_VAL ( FRIBIDI_MASK_NEUTRAL | FRIBIDI_MASK_WEAK | FRIBIDI_MASK_ISOLATE )
/* Define Enums only if sizeof(int) == 4 (UTF-32), and not compiling C++.
* The problem with C++ is that then casts between int32 and enum will fail!
*/
#if defined(__FRIBIDI_DOC) || (FRIBIDI_SIZEOF_INT+0 == 4 && !defined(__cplusplus))
typedef enum
{
# define _FRIBIDI_ADD_TYPE(TYPE,SYMBOL) \
FRIBIDI_TYPE_##TYPE = FRIBIDI_TYPE_##TYPE##_VAL,
# include "fribidi-bidi-types-list.h"
# undef _FRIBIDI_ADD_TYPE
_FRIBIDI_TYPE_SENTINEL = FRIBIDI_TYPE_SENTINEL /* Don't use this */
} FriBidiCharType;
typedef enum
{
# define _FRIBIDI_PAR_TYPES
# define _FRIBIDI_ADD_TYPE(TYPE,SYMBOL) \
FRIBIDI_PAR_##TYPE = FRIBIDI_TYPE_##TYPE##_VAL,
# include "fribidi-bidi-types-list.h"
# undef _FRIBIDI_ADD_TYPE
# undef _FRIBIDI_PAR_TYPES
_FRIBIDI_PAR_SENTINEL = FRIBIDI_TYPE_SENTINEL /* Don't use this */
} FriBidiParType;
#else
typedef uint32_t FriBidiCharType;
# define FRIBIDI_TYPE_LTR FRIBIDI_TYPE_LTR_VAL
# define FRIBIDI_TYPE_RTL FRIBIDI_TYPE_RTL_VAL
# define FRIBIDI_TYPE_AL FRIBIDI_TYPE_AL_VAL
# define FRIBIDI_TYPE_EN FRIBIDI_TYPE_EN_VAL
# define FRIBIDI_TYPE_AN FRIBIDI_TYPE_AN_VAL
# define FRIBIDI_TYPE_ES FRIBIDI_TYPE_ES_VAL
# define FRIBIDI_TYPE_ET FRIBIDI_TYPE_ET_VAL
# define FRIBIDI_TYPE_CS FRIBIDI_TYPE_CS_VAL
# define FRIBIDI_TYPE_NSM FRIBIDI_TYPE_NSM_VAL
# define FRIBIDI_TYPE_BN FRIBIDI_TYPE_BN_VAL
# define FRIBIDI_TYPE_BS FRIBIDI_TYPE_BS_VAL
# define FRIBIDI_TYPE_SS FRIBIDI_TYPE_SS_VAL
# define FRIBIDI_TYPE_WS FRIBIDI_TYPE_WS_VAL
# define FRIBIDI_TYPE_ON FRIBIDI_TYPE_ON_VAL
# define FRIBIDI_TYPE_LRE FRIBIDI_TYPE_LRE_VAL
# define FRIBIDI_TYPE_RLE FRIBIDI_TYPE_RLE_VAL
# define FRIBIDI_TYPE_LRO FRIBIDI_TYPE_LRO_VAL
# define FRIBIDI_TYPE_RLO FRIBIDI_TYPE_RLO_VAL
# define FRIBIDI_TYPE_PDF FRIBIDI_TYPE_PDF_VAL
# define FRIBIDI_TYPE_LRI FRIBIDI_TYPE_LRI_VAL
# define FRIBIDI_TYPE_RLI FRIBIDI_TYPE_RLI_VAL
# define FRIBIDI_TYPE_FSI FRIBIDI_TYPE_FSI_VAL
# define FRIBIDI_TYPE_PDI FRIBIDI_TYPE_PDI_VAL
typedef uint32_t FriBidiParType;
# define FRIBIDI_PAR_LTR FRIBIDI_TYPE_LTR_VAL
# define FRIBIDI_PAR_RTL FRIBIDI_TYPE_RTL_VAL
# define FRIBIDI_PAR_ON FRIBIDI_TYPE_ON_VAL
# define FRIBIDI_PAR_WLTR FRIBIDI_TYPE_WLTR_VAL
# define FRIBIDI_PAR_WRTL FRIBIDI_TYPE_WRTL_VAL
#endif
/* Please don't use these two type names, use FRIBIDI_PAR_* form instead. */
#define FRIBIDI_TYPE_WLTR FRIBIDI_PAR_WLTR
#define FRIBIDI_TYPE_WRTL FRIBIDI_PAR_WRTL
/*
* Defining macros for needed queries, It is fully dependent on the
* implementation of FriBidiCharType.
*/
/* Is right-to-left level? */
#define FRIBIDI_LEVEL_IS_RTL(lev) ((lev) & 1)
/* Return the bidi type corresponding to the direction of the level number,
FRIBIDI_TYPE_LTR for evens and FRIBIDI_TYPE_RTL for odds. */
#define FRIBIDI_LEVEL_TO_DIR(lev) \
(FRIBIDI_LEVEL_IS_RTL (lev) ? FRIBIDI_TYPE_RTL : FRIBIDI_TYPE_LTR)
/* Return the minimum level of the direction, 0 for FRIBIDI_TYPE_LTR and
1 for FRIBIDI_TYPE_RTL and FRIBIDI_TYPE_AL. */
#define FRIBIDI_DIR_TO_LEVEL(dir) \
((FriBidiLevel) (FRIBIDI_IS_RTL (dir) ? 1 : 0))
/* Is right to left: RTL, AL, RLE, RLO? */
#define FRIBIDI_IS_RTL(p) ((p) & FRIBIDI_MASK_RTL)
/* Is arabic: AL, AN? */
#define FRIBIDI_IS_ARABIC(p) ((p) & FRIBIDI_MASK_ARABIC)
/* Is strong? */
#define FRIBIDI_IS_STRONG(p) ((p) & FRIBIDI_MASK_STRONG)
/* Is weak? */
#define FRIBIDI_IS_WEAK(p) ((p) & FRIBIDI_MASK_WEAK)
/* Is neutral? */
#define FRIBIDI_IS_NEUTRAL(p) ((p) & FRIBIDI_MASK_NEUTRAL)
/* Is sentinel? */
#define FRIBIDI_IS_SENTINEL(p) ((p) & FRIBIDI_MASK_SENTINEL)
/* Is letter: L, R, AL? */
#define FRIBIDI_IS_LETTER(p) ((p) & FRIBIDI_MASK_LETTER)
/* Is number: EN, AN? */
#define FRIBIDI_IS_NUMBER(p) ((p) & FRIBIDI_MASK_NUMBER)
/* Is number separator or terminator: ES, ET, CS? */
#define FRIBIDI_IS_NUMBER_SEPARATOR_OR_TERMINATOR(p) \
((p) & FRIBIDI_MASK_NUMSEPTER)
/* Is space: BN, BS, SS, WS? */
#define FRIBIDI_IS_SPACE(p) ((p) & FRIBIDI_MASK_SPACE)
/* Is explicit mark: LRE, RLE, LRO, RLO, PDF? */
#define FRIBIDI_IS_EXPLICIT(p) ((p) & FRIBIDI_MASK_EXPLICIT)
/* Is isolator */
#define FRIBIDI_IS_ISOLATE(p) ((p) & FRIBIDI_MASK_ISOLATE)
/* Is text separator: BS, SS? */
#define FRIBIDI_IS_SEPARATOR(p) ((p) & FRIBIDI_MASK_SEPARATOR)
/* Is explicit override: LRO, RLO? */
#define FRIBIDI_IS_OVERRIDE(p) ((p) & FRIBIDI_MASK_OVERRIDE)
/* Some more: */
/* Is left to right letter: LTR? */
#define FRIBIDI_IS_LTR_LETTER(p) \
((p) & (FRIBIDI_MASK_LETTER | FRIBIDI_MASK_RTL) == FRIBIDI_MASK_LETTER)
/* Is right to left letter: RTL, AL? */
#define FRIBIDI_IS_RTL_LETTER(p) \
((p) & (FRIBIDI_MASK_LETTER | FRIBIDI_MASK_RTL) \
== (FRIBIDI_MASK_LETTER | FRIBIDI_MASK_RTL))
/* Is ES or CS: ES, CS? */
#define FRIBIDI_IS_ES_OR_CS(p) \
((p) & (FRIBIDI_MASK_ES | FRIBIDI_MASK_CS))
/* Is explicit or BN: LRE, RLE, LRO, RLO, PDF, BN? */
#define FRIBIDI_IS_EXPLICIT_OR_BN(p) \
((p) & (FRIBIDI_MASK_EXPLICIT | FRIBIDI_MASK_BN))
/* Is explicit or BN or NSM: LRE, RLE, LRO, RLO, PDF, BN, NSM? */
#define FRIBIDI_IS_EXPLICIT_OR_BN_OR_NSM(p) \
((p) & (FRIBIDI_MASK_EXPLICIT | FRIBIDI_MASK_BN | FRIBIDI_MASK_NSM))
/* Is explicit or BN or NSM: LRE, RLE, LRO, RLO, PDF, BN, NSM? */
#define FRIBIDI_IS_EXPLICIT_OR_ISOLATE_OR_BN_OR_NSM(p) \
((p) & (FRIBIDI_MASK_EXPLICIT | FRIBIDI_MASK_ISOLATE | FRIBIDI_MASK_BN | FRIBIDI_MASK_NSM))
/* Is explicit or BN or WS: LRE, RLE, LRO, RLO, PDF, BN, WS? */
#define FRIBIDI_IS_EXPLICIT_OR_BN_OR_WS(p) \
((p) & (FRIBIDI_MASK_EXPLICIT | FRIBIDI_MASK_BN | FRIBIDI_MASK_WS))
/* Is explicit or separator or BN or WS: LRE, RLE, LRO, RLO, PDF, BS, SS, BN, WS? */
#define FRIBIDI_IS_EXPLICIT_OR_SEPARATOR_OR_BN_OR_WS(p) \
((p) & (FRIBIDI_MASK_EXPLICIT | FRIBIDI_MASK_SEPARATOR \
| FRIBIDI_MASK_BN | FRIBIDI_MASK_WS))
/* Is private-use type for application? */
#define FRIBIDI_IS_PRIVATE(p) ((p) & FRIBIDI_MASK_PRIVATE)
/* Define some conversions. */
/* Change numbers to RTL: EN,AN -> RTL. */
#define FRIBIDI_CHANGE_NUMBER_TO_RTL(p) \
(FRIBIDI_IS_NUMBER(p) ? FRIBIDI_TYPE_RTL : (p))
/* Override status of an explicit mark:
* LRO,LRE->LTR, RLO,RLE->RTL, otherwise->ON. */
#define FRIBIDI_EXPLICIT_TO_OVERRIDE_DIR(p) \
(FRIBIDI_IS_OVERRIDE(p) ? FRIBIDI_LEVEL_TO_DIR(FRIBIDI_DIR_TO_LEVEL(p)) \
: FRIBIDI_TYPE_ON)
/* Weaken type for paragraph fallback purposes:
* LTR->WLTR, RTL->WRTL. */
#define FRIBIDI_WEAK_PARAGRAPH(p) (FRIBIDI_PAR_WLTR | ((p) & FRIBIDI_MASK_RTL))
/* Functions finally */
/* fribidi_get_bidi_type - get character bidi type
*
* This function returns the bidi type of a character as defined in Table 3.7
* Bidirectional Character Types of the Unicode Bidirectional Algorithm
* available at
* http://www.unicode.org/reports/tr9/#Bidirectional_Character_Types, using
* data provided in file UnicodeData.txt of the Unicode Character Database
* available at http://www.unicode.org/Public/UNIDATA/UnicodeData.txt.
*
* There are a few macros defined in fribidi-bidi-types.h for querying a bidi
* type.
*/
FRIBIDI_ENTRY FriBidiCharType
fribidi_get_bidi_type (
FriBidiChar ch /* input character */
) FRIBIDI_GNUC_CONST;
/* fribidi_get_bidi_types - get bidi types for an string of characters
*
* This function finds the bidi types of an string of characters. See
* fribidi_get_bidi_type() for more information about the bidi types returned
* by this function.
*/
FRIBIDI_ENTRY void fribidi_get_bidi_types (
const FriBidiChar *str, /* input string */
const FriBidiStrIndex len, /* input string length */
FriBidiCharType *btypes /* output bidi types */
);
/* fribidi_get_bidi_type_name - get bidi type name
*
* This function returns the bidi type name of a character type. The
* returned string is a static string and should not be freed.
*
* The type names are the same as ones defined in Table 3.7 Bidirectional
* Character Types of the Unicode Bidirectional Algorithm available at
* http://www.unicode.org/reports/tr9/#Bidirectional_Character_Types, with a
* few modifications: L->LTR, R->RTL, B->BS, S->SS.
*/
FRIBIDI_ENTRY const char *fribidi_get_bidi_type_name (
FriBidiCharType t /* input bidi type */
) FRIBIDI_GNUC_CONST;
#include "fribidi-enddecls.h"
#endif /* !_FRIBIDI_BIDI_TYPES_H */
/* Editor directions:
* vim:textwidth=78:tabstop=8:shiftwidth=2:autoindent:cindent
*/
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