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Man Pages


Manual Reference Pages  -  FRIBIDI_GET_PAR_EMBEDDING_LEVELS (3)

NAME

fribidi_get_par_embedding_levels - get bidi embedding levels of a paragraph

CONTENTS

SYNOPSIS

#include <fribidi.h>

FriBidiLevel fribidi_get_par_embedding_levels
(
        const FriBidiCharType *bidi_types,
        const FriBidiStrIndex len,
        FriBidiParType *pbase_dir,
        FriBidiLevel *embedding_levels
);

PARAMETERS

const FriBidiCharType *bidi_types
  Input list of bidi types as returned by fribidi_get_bidi_types().

Possible values for a const FriBidiCharType are as follows:

 
FRIBIDI_TYPE_LTR Left-To-Right letter.
FRIBIDI_TYPE_RTL Right-To-Left letter.
FRIBIDI_TYPE_AL Arabic Letter.
FRIBIDI_TYPE_EN European Numeral.
FRIBIDI_TYPE_AN Arabic Numeral.
FRIBIDI_TYPE_ES European number Separator.
FRIBIDI_TYPE_ET European number Terminator.
FRIBIDI_TYPE_CS Common Separator.
FRIBIDI_TYPE_NSM Non Spacing Mark.
FRIBIDI_TYPE_BN Boundary Neutral.
FRIBIDI_TYPE_BS Block Separator.
FRIBIDI_TYPE_SS Segment Separator.
FRIBIDI_TYPE_WS WhiteSpace.
FRIBIDI_TYPE_ON Other Neutral.
FRIBIDI_TYPE_LRE Left-to-Right Embedding.
FRIBIDI_TYPE_RLE Right-to-Left Embedding.
FRIBIDI_TYPE_LRO Left-to-Right Override.
FRIBIDI_TYPE_RLO Right-to-Left Override.
FRIBIDI_TYPE_PDF Pop Directional Flag.
const FriBidiStrIndex len
  Input string length of the paragraph.
FriBidiParType *pbase_dir
  Requested and resolved paragraph base direction.

Possible values for a FriBidiParType are as follows:
FRIBIDI_PAR_LTR Left-To-Right paragraph.
FRIBIDI_PAR_RTL Right-To-Left paragraph.
FRIBIDI_PAR_ON DirectiOn-Neutral paragraph.
FRIBIDI_PAR_WLTR Weak Left To Right paragraph.
FRIBIDI_PAR_WRTL Weak Right To Left paragraph.

FriBidiLevel *embedding_levels
  Output list of embedding levels.

DESCRIPTION

This function finds the bidi embedding levels of a single paragraph, as defined by the Unicode Bidirectional Algorithm available at http://www.unicode.org/reports/tr9/. This function implements rules P2 to I1 inclusive, and parts 1 to 3 of L1, except for rule X9 which is implemented in fribidi_remove_bidi_marks(). Part 4 of L1 is implemented in fribidi_reorder_line().

There are a few macros defined in fribidi-bidi-types.h to work with this embedding levels.

RETURNS

Maximum level found plus one, or zero if any error occured (memory allocation failure most probably).

SEE ALSO

fribidi_charset_to_unicode(3), fribidi_unicode_to_charset(3), fribidi_parse_charset(3), fribidi_shape_arabic(3), fribidi_get_par_direction(3), fribidi_reorder_line(3), fribidi_get_bidi_type(3), fribidi_get_bidi_types(3), fribidi_get_bidi_type_name(3), fribidi_debug_status(3), fribidi_mirroring_status(3), fribidi_set_mirroring(3), fribidi_reorder_nsm_status(3), fribidi_set_reorder_nsm(3), fribidi_log2vis_get_embedding_levels(3), fribidi_get_type(3), fribidi_get_type_internal(3), fribidi_remove_bidi_marks(3), fribidi_log2vis(3), fribidi_join_arabic(3), fribidi_get_joining_type(3), fribidi_get_joining_types(3), fribidi_get_joining_type_name(3), fribidi_get_mirror_char(3), fribidi_shape_mirroring(3), fribidi_shape(3)
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GNU FriBidi 0.19.7 FRIBIDI_GET_PAR_EMBEDDING_LEVELS (3) 1 February 2013

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