gnulib/lib/unilbrk.in.h

/* Line breaking of Unicode strings.
   Copyright (C) 2001-2003, 2005-2020 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2001.

   This program 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 3 of the License, or
   (at your option) any later version.

   This program 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 program.  If not, see <https://www.gnu.org/licenses/>.  */

#ifndef _UNILBRK_H
#define _UNILBRK_H

/* Get size_t.  */
#include <stddef.h>

#include "unitypes.h"

/* Get locale_charset() declaration.  */
#include "localcharset.h"


#ifdef __cplusplus
extern "C" {
#endif


/* These functions are locale dependent.  The encoding argument identifies
   the encoding (e.g. "ISO-8859-2" for Polish).  */


/* Line breaking.  */

enum
{
  UC_BREAK_UNDEFINED,
  UC_BREAK_PROHIBITED,
  UC_BREAK_POSSIBLE,
  UC_BREAK_MANDATORY,
  UC_BREAK_HYPHENATION
};

/* Determine the line break points in S, and store the result at p[0..n-1].
   p[i] = UC_BREAK_MANDATORY means that s[i] is a line break character.
   p[i] = UC_BREAK_POSSIBLE means that a line break may be inserted between
          s[i-1] and s[i].
   p[i] = UC_BREAK_HYPHENATION means that a hyphen and a line break may be
          inserted between s[i-1] and s[i].  But beware of language dependent
          hyphenation rules.
   p[i] = UC_BREAK_PROHIBITED means that s[i-1] and s[i] must not be separated.
 */
extern void
       u8_possible_linebreaks (const uint8_t *s, size_t n,
                               const char *encoding, char *_UC_RESTRICT p);
extern void
       u16_possible_linebreaks (const uint16_t *s, size_t n,
                                const char *encoding, char *_UC_RESTRICT p);
extern void
       u32_possible_linebreaks (const uint32_t *s, size_t n,
                                const char *encoding, char *_UC_RESTRICT p);
extern void
       ulc_possible_linebreaks (const char *s, size_t n,
                                const char *encoding, char *_UC_RESTRICT p);

/* Choose the best line breaks, assuming the uc_width function.
   The string is s[0..n-1].  The maximum number of columns per line is given
   as WIDTH.  The starting column of the string is given as START_COLUMN.
   If the algorithm shall keep room after the last piece, they can be given
   as AT_END_COLUMNS.
   o is an optional override; if o[i] != UC_BREAK_UNDEFINED, o[i] takes
   precedence over p[i] as returned by the *_possible_linebreaks function.
   The given ENCODING is used for disambiguating widths in uc_width.
   Return the column after the end of the string, and store the result at
   p[0..n-1].
 */
extern int
       u8_width_linebreaks (const uint8_t *s, size_t n, int width,
                            int start_column, int at_end_columns,
                            const char *o, const char *encoding,
                            char *_UC_RESTRICT p);
extern int
       u16_width_linebreaks (const uint16_t *s, size_t n, int width,
                             int start_column, int at_end_columns,
                             const char *o, const char *encoding,
                             char *_UC_RESTRICT p);
extern int
       u32_width_linebreaks (const uint32_t *s, size_t n, int width,
                             int start_column, int at_end_columns,
                             const char *o, const char *encoding,
                             char *_UC_RESTRICT p);
extern int
       ulc_width_linebreaks (const char *s, size_t n, int width,
                             int start_column, int at_end_columns,
                             const char *o, const char *encoding,
                             char *_UC_RESTRICT p);


#ifdef __cplusplus
}
#endif


#endif /* _UNILBRK_H */