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NAME

ucpgba - functions for doing bidirectional reordering of Unicode text, and logical and visual cursor motion

SYNOPSIS

#include <ucdata.h>
#include <ucpgba.h>

ucstring_t *ucstring_create(unsigned long *source, unsigned long start, unsigned long end, int default_direction, int cursor_motion)

void ucstring_free(ucstring_t *string)

int ucstring_set_cursor_motion(ucstring_t *string, int cursor_motion)

int ucstring_cursor_right(ucstring_t *string, int count)

int ucstring_cursor_left(ucstring_t *string, int count)

void ucstring_cursor_info(ucstring_t *string, int *direction, unsigned long *position)

DESCRIPTION

Macros
UCPGBA_LTR
UCPGBA_RTL
UCPGBA_CURSOR_VISUAL
UCPGBA_CURSOR_LOGICAL

ucstring_create()

This function will create a reordered string by using the implicit directionality of the characters in the specified substring.

The `default_direction' parameter should be one of UCPGBA_LTR or UCPGBA_RTL and is used only in cases where a string contains no characters with strong directionality.

The `cursor_motion' parameter should be one of UCPGBA_CURSOR_VISUAL or UCPGBA_CURSOR_LOGICAL, and is used to specify the initial cursor motion behavior. This behavior can be switched at any time using ustring_set_cursor_motion().

ucstring_free()

This function will deallocate the memory used by the string, incuding the string itself.

ucstring_cursor_info()

This function will return the text position of the internal cursor and the directionality of the text at that position. The position returned is the original text position of the character.

ucstring_set_cursor_motion()

This function will change the cursor motion type and return the previous cursor motion type.

ucstring_cursor_right()

This function will move the internal cursor to the right according to the type of cursor motion set for the string.

If no cursor motion is performed, it returns 0. Otherwise it will return a 1.

ucstring_cursor_left()

This function will move the internal cursor to the left according to the type of cursor motion set for the string.

If no cursor motion is performed, it returns 0. Otherwise it will return a 1.

SEE ALSO

ucdata(3)

ACKNOWLEDGMENTS

These are people who have helped with patches or alerted me about problems.

AUTHOR

Mark Leisher
Computing Research Lab
New Mexico State University
Email: mleisher@crl.nmsu.edu

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