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/* Grapheme cluster breaks in Unicode strings.
Copyright (C) 2010-2024 Free Software Foundation, Inc.
Written by Ben Pfaff <blp@cs.stanford.edu>, 2010.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _UNIGBRK_H
#define _UNIGBRK_H
/* Get bool. */
#include <stdbool.h>
/* Get size_t. */
#include <stddef.h>
#include "unitypes.h"
#ifdef __cplusplus
extern "C" {
#endif
/* ========================================================================= */
/* Property defined in Unicode Standard Annex #29, section "Grapheme Cluster
Boundaries"
<https://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries> */
/* Possible values of the Grapheme_Cluster_Break property.
This enumeration may be extended in the future. */
enum
{
GBP_OTHER = 0,
GBP_CR = 1,
GBP_LF = 2,
GBP_CONTROL = 3,
GBP_EXTEND = 4,
GBP_PREPEND = 5,
GBP_SPACINGMARK = 6,
GBP_L = 7,
GBP_V = 8,
GBP_T = 9,
GBP_LV = 10,
GBP_LVT = 11,
GBP_RI = 12,
GBP_ZWJ = 13,
GBP_EB = 14, /* obsolete */
GBP_EM = 15, /* obsolete */
GBP_GAZ = 16, /* obsolete */
GBP_EBG = 17 /* obsolete */
};
/* Return the Grapheme_Cluster_Break property of a Unicode character. */
extern int
uc_graphemeclusterbreak_property (ucs4_t uc)
_UC_ATTRIBUTE_CONST;
/* ========================================================================= */
/* Grapheme cluster breaks. */
/* Returns true if there is a grapheme cluster boundary between Unicode code
points A and B. A "grapheme cluster" is an approximation to a
user-perceived character, which sometimes corresponds to multiple code
points. For example, an English letter followed by an acute accent can be
expressed as two consecutive Unicode code points, but it is perceived by the
user as only a single character and therefore constitutes a single grapheme
cluster.
Implements extended (not legacy) grapheme cluster rules, because UAX #29
indicates that they are preferred.
Note: This function does not work right with syllables in Indic scripts or
emojis, because it does not look at the characters before A and after B.
Use A == 0 or B == 0 to indicate start of text or end of text,
respectively. */
extern bool
uc_is_grapheme_break (ucs4_t a, ucs4_t b)
_UC_ATTRIBUTE_CONST;
/* Returns the start of the next grapheme cluster following S, or NULL if the
end of the string has been reached.
Note: These functions do not work right with syllables in Indic scripts or
emojis, because they do not consider the characters before S. */
extern const uint8_t *
u8_grapheme_next (const uint8_t *s, const uint8_t *end)
_UC_ATTRIBUTE_PURE;
extern const uint16_t *
u16_grapheme_next (const uint16_t *s, const uint16_t *end)
_UC_ATTRIBUTE_PURE;
extern const uint32_t *
u32_grapheme_next (const uint32_t *s, const uint32_t *end)
_UC_ATTRIBUTE_PURE;
/* Returns the start of the previous grapheme cluster before S, or NULL if the
start of the string has been reached.
Note: These functions do not work right with syllables in Indic scripts or
emojis, because they do not consider the characters at or after S. */
extern const uint8_t *
u8_grapheme_prev (const uint8_t *s, const uint8_t *start)
_UC_ATTRIBUTE_PURE;
extern const uint16_t *
u16_grapheme_prev (const uint16_t *s, const uint16_t *start)
_UC_ATTRIBUTE_PURE;
extern const uint32_t *
u32_grapheme_prev (const uint32_t *s, const uint32_t *start)
_UC_ATTRIBUTE_PURE;
/* Determine the grapheme cluster boundaries in S, and store the result at
p[0..n-1]. p[i] = 1 means that a new grapheme cluster begins at s[i]. p[i]
= 0 means that s[i-1] and s[i] are part of the same grapheme cluster. p[0]
will always be 1.
*/
extern void
u8_grapheme_breaks (const uint8_t *s, size_t n, char *p);
extern void
u16_grapheme_breaks (const uint16_t *s, size_t n, char *p);
extern void
u32_grapheme_breaks (const uint32_t *s, size_t n, char *p);
extern void
ulc_grapheme_breaks (const char *s, size_t n, char *p);
extern void
uc_grapheme_breaks (const ucs4_t *s, size_t n, char *p);
/* ========================================================================= */
#ifdef __cplusplus
}
#endif
#endif /* _UNIGBRK_H */
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