8.3 Bidirectional category
Every Unicode character or code point has a bidirectional category
assigned to it.
The bidirectional category guides the bidirectional algorithm
(http://www.unicode.org/reports/tr9/). The possible values are
the following.
— Constant: int
UC_BIDI_L
The bidirectional category for `Left-to-Right`” characters.
— Constant: int
UC_BIDI_LRE
The bidirectional category for “Left-to-Right Embedding” characters.
— Constant: int
UC_BIDI_LRO
The bidirectional category for “Left-to-Right Override” characters.
— Constant: int
UC_BIDI_R
The bidirectional category for “Right-to-Left” characters.
— Constant: int
UC_BIDI_AL
The bidirectional category for “Right-to-Left Arabic” characters.
— Constant: int
UC_BIDI_RLE
The bidirectional category for “Right-to-Left Embedding” characters.
— Constant: int
UC_BIDI_RLO
The bidirectional category for “Right-to-Left Override” characters.
— Constant: int
UC_BIDI_PDF
The bidirectional category for “Pop Directional Format” characters.
— Constant: int
UC_BIDI_EN
The bidirectional category for “European Number” characters.
— Constant: int
UC_BIDI_ES
The bidirectional category for “European Number Separator” characters.
— Constant: int
UC_BIDI_ET
The bidirectional category for “European Number Terminator” characters.
— Constant: int
UC_BIDI_AN
The bidirectional category for “Arabic Number” characters.
— Constant: int
UC_BIDI_CS
The bidirectional category for “Common Number Separator” characters.
— Constant: int
UC_BIDI_NSM
The bidirectional category for “Non-Spacing Mark” characters.
— Constant: int
UC_BIDI_BN
The bidirectional category for “Boundary Neutral” characters.
— Constant: int
UC_BIDI_B
The bidirectional category for “Paragraph Separator” characters.
— Constant: int
UC_BIDI_S
The bidirectional category for “Segment Separator” characters.
— Constant: int
UC_BIDI_WS
The bidirectional category for “Whitespace” characters.
— Constant: int
UC_BIDI_ON
The bidirectional category for “Other Neutral” characters.
The following functions implement the association between a bidirectional
category and its name.
— Function: const char *
uc_bidi_category_name (
int category)
Returns the name of a bidirectional category.
— Function: int
uc_bidi_category_byname (
const char *category_name)
Returns the bidirectional category given by name, e.g. "LRE".
The following functions view bidirectional categories as sets of Unicode
characters.
— Function: int
uc_bidi_category (
ucs4_t uc)
Returns the bidirectional category of a Unicode character.
— Function: bool
uc_is_bidi_category (
ucs4_t uc, int category)
Tests whether a Unicode character belongs to a given bidirectional category.