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