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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2021 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* Copyright 1999 Computing Research Labs, New Mexico State University
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COMPUTING RESEARCH LAB OR NEW MEXICO STATE UNIVERSITY BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
* OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
* THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* $Id: ucpgba.h,v 1.4 1999/11/19 15:24:30 mleisher Exp $ */
#ifndef _h_ucpgba
#define _h_ucpgba
#include "portable.h"
LDAP_BEGIN_DECL
/***************************************************************************
*
* Macros and types.
*
***************************************************************************/
/*
* These are the direction values that can appear in render runs and render
* strings.
*/
#define UCPGBA_LTR 0
#define UCPGBA_RTL 1
/*
* These are the flags for cursor motion.
*/
#define UCPGBA_CURSOR_VISUAL 0
#define UCPGBA_CURSOR_LOGICAL 1
/*
* This structure is used to contain runs of text in a particular direction.
*/
typedef struct _ucrun_t {
struct _ucrun_t *visual_prev; /* Pointer to the previous visual run. */
struct _ucrun_t *visual_next; /* Pointer to the next visual run. */
struct _ucrun_t *logical_prev; /* Pointer to the previous logical run. */
struct _ucrun_t *logical_next; /* Pointer to the next logical run. */
int direction; /* Direction of the run. */
long cursor; /* Position of "cursor" in the string. */
unsigned long *chars; /* List of characters for the run. */
unsigned long *positions; /* List of original positions in source. */
unsigned long *source; /* The source string. */
unsigned long start; /* Beginning offset in the source string. */
unsigned long end; /* Ending offset in the source string. */
} ucrun_t;
/*
* This represents a string of runs rendered up to a point that is not
* platform specific.
*/
typedef struct _ucstring_t {
int direction; /* Overall direction of the string. */
int cursor_motion; /* Logical or visual cursor motion flag. */
ucrun_t *cursor; /* The run containing the "cursor." */
ucrun_t *logical_first; /* First run in the logical order. */
ucrun_t *logical_last; /* Last run in the logical order. */
ucrun_t *visual_first; /* First run in the visual order. */
ucrun_t *visual_last; /* Last run in the visual order. */
unsigned long *source; /* The source string. */
unsigned long start; /* The beginning offset in the source. */
unsigned long end; /* The ending offset in the source. */
} ucstring_t;
/***************************************************************************
*
* API
*
***************************************************************************/
/*
* This creates and reorders the specified substring using the
* "Pretty Good Bidi Algorithm." A default direction is provided for cases
* of a string containing no strong direction characters and the default
* cursor motion should be provided.
*/
LDAP_LUNICODE_F (ucstring_t *)
ucstring_create LDAP_P((unsigned long *source,
unsigned long start,
unsigned long end,
int default_direction,
int cursor_motion));
/*
* This releases the string.
*/
LDAP_LUNICODE_F (void) ucstring_free LDAP_P((ucstring_t *string));
/*
* This changes the cursor motion flag for the string.
*/
LDAP_LUNICODE_F (int)
ucstring_set_cursor_motion LDAP_P((ucstring_t *string,
int cursor_motion));
/*
* This function will move the cursor to the right depending on the
* type of cursor motion that was specified for the string.
*
* A 0 is returned if no cursor motion is performed, otherwise a
* 1 is returned.
*/
LDAP_LUNICODE_F (int)
ucstring_cursor_right LDAP_P((ucstring_t *string, int count));
/*
* This function will move the cursor to the left depending on the
* type of cursor motion that was specified for the string.
*
* A 0 is returned if no cursor motion is performed, otherwise a
* 1 is returned.
*/
LDAP_LUNICODE_F (int)
ucstring_cursor_left LDAP_P((ucstring_t *string, int count));
/*
* This routine retrieves the direction of the run containing the cursor
* and the actual position in the original text string.
*/
LDAP_LUNICODE_F (void)
ucstring_cursor_info LDAP_P((ucstring_t *string, int *direction,
unsigned long *position));
LDAP_END_DECL
#endif /* _h_ucpgba */
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