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Diffstat (limited to 'libraries/liblunicode/ucdata/ucpgba.h')
| -rw-r--r-- | libraries/liblunicode/ucdata/ucpgba.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/libraries/liblunicode/ucdata/ucpgba.h b/libraries/liblunicode/ucdata/ucpgba.h new file mode 100644 index 0000000..05ff54e --- /dev/null +++ b/libraries/liblunicode/ucdata/ucpgba.h @@ -0,0 +1,167 @@ +/* $OpenLDAP$ */ +/* 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 */ |