diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | NEWS | 8 | ||||
| -rw-r--r-- | doc/libunistring.texi | 1 | ||||
| -rw-r--r-- | doc/unictype.texi | 158 |
4 files changed, 173 insertions, 0 deletions
@@ -1,3 +1,9 @@ +2011-03-21 Bruno Haible <bruno@clisp.org> + + Add support for Arabic shaping properties. + * doc/libunistring.texi: Update menu. + * doc/unictype.texi (Arabic shaping): New section. + 2011-01-09 Bruno Haible <bruno@clisp.org> Update to Unicode 6.0.0. @@ -1,6 +1,14 @@ New in 0.9.4: * The data tables and line breaking algorithm have been updated to Unicode version 6.0.0. +* In the include file unictype.h, functions for the Arabic joining type and + the Arabic joining group have been added: + uc_joining_type_name + uc_joining_type_byname + uc_joining_type + uc_joining_group_name + uc_joining_group_byname + uc_joining_group * In the include file unictype.h, functions for new predefined properties have been added: uc_is_property_cased diff --git a/doc/libunistring.texi b/doc/libunistring.texi index 5778c75..3691127 100644 --- a/doc/libunistring.texi +++ b/doc/libunistring.texi @@ -199,6 +199,7 @@ unictype.h * Digit value:: * Numeric value:: * Mirrored character:: +* Arabic shaping:: * Properties:: * Scripts:: * Blocks:: diff --git a/doc/unictype.texi b/doc/unictype.texi index c7559b5..6f0c3a0 100644 --- a/doc/unictype.texi +++ b/doc/unictype.texi @@ -19,6 +19,7 @@ in the presence of specific Unicode characters. * Digit value:: * Numeric value:: * Mirrored character:: +* Arabic shaping:: * Properties:: * Scripts:: * Blocks:: @@ -647,6 +648,163 @@ Stores the mirrored character of a Unicode character @var{uc} in stores @var{uc} unmodified in @code{*@var{puc}} and returns @code{false}. @end deftypefun +@node Arabic shaping +@section Arabic shaping + +@cindex Arabic shaping +@cindex joining of Arabic characters +When Arabic characters are rendered, after bidi reordering has taken +place, the shape of the glyphs are modified so that many adjacent glyphs +are joined. Two character properties describe how this ``Arabic shaping'' +takes place: the joining type and the joining group. + +@menu +* Joining type:: +* Joining group:: +@end menu + +@node Joining type +@subsection Joining type of Arabic characters + +@cindex joining type +The joining type of a character describes on which of the left and right +neighbour characters the character's shape depends, and which of the two +neighbour characters are rendered depending on this character. + +The joining type has the following possible values: + +@deftypevr Constant int UC_JOINING_TYPE_U +``Non joining'': Characters of this joining type prohibit joining. +@end deftypevr + +@deftypevr Constant int UC_JOINING_TYPE_T +``Transparent'': Characters of this joining type are skipped when +considering joining. +@end deftypevr + +@deftypevr Constant int UC_JOINING_TYPE_C +``Join causing'': Characters of this joining type cause their neighbour +characters to change their shapes but don't change their own shape. +@end deftypevr + +@deftypevr Constant int UC_JOINING_TYPE_L +``Left joining'': Characters of this joining type have two shapes, +isolated and initial. Such characters currently don't exist. +@end deftypevr + +@deftypevr Constant int UC_JOINING_TYPE_R +``Right joining'': Characters of this joining type have two shapes, +isolated and final. +@end deftypevr + +@deftypevr Constant int UC_JOINING_TYPE_D +``Dual joining'': Characters of this joining type have four shapes, +initial, medial, final, and isolated. +@end deftypevr + +The following functions implement the association between a joining type +and its name. + +@deftypefun {const char *} uc_joining_type_name (int @var{joining_type}) +Returns the name of a joining type. +@end deftypefun + +@deftypefun int uc_joining_type_byname (const char *@var{joining_type_name}) +Returns the joining type given by name, e.g.@ @code{"D"}. +@end deftypefun + +The following function gives the joining type of every Unicode character. + +@deftypefun int uc_joining_type (ucs4_t @var{uc}) +Returns the joining type of a Unicode character. +@end deftypefun + +@node Joining group +@subsection Joining group of Arabic characters + +@cindex joining group +The joining group of a character describes how the character's shape +is modified in the four contexts of dual-joining characters or in the +two contexts of right-joining characters. + +The joining group has the following possible values: + +@deftypevr Constant int UC_JOINING_GROUP_NONE +@deftypevrx Constant int UC_JOINING_GROUP_AIN +@deftypevrx Constant int UC_JOINING_GROUP_ALAPH +@deftypevrx Constant int UC_JOINING_GROUP_ALEF +@deftypevrx Constant int UC_JOINING_GROUP_BEH +@deftypevrx Constant int UC_JOINING_GROUP_BETH +@deftypevrx Constant int UC_JOINING_GROUP_BURUSHASKI_YEH_BARREE +@deftypevrx Constant int UC_JOINING_GROUP_DAL +@deftypevrx Constant int UC_JOINING_GROUP_DALATH_RISH +@deftypevrx Constant int UC_JOINING_GROUP_E +@deftypevrx Constant int UC_JOINING_GROUP_FARSI_YEH +@deftypevrx Constant int UC_JOINING_GROUP_FE +@deftypevrx Constant int UC_JOINING_GROUP_FEH +@deftypevrx Constant int UC_JOINING_GROUP_FINAL_SEMKATH +@deftypevrx Constant int UC_JOINING_GROUP_GAF +@deftypevrx Constant int UC_JOINING_GROUP_GAMAL +@deftypevrx Constant int UC_JOINING_GROUP_HAH +@deftypevrx Constant int UC_JOINING_GROUP_HE +@deftypevrx Constant int UC_JOINING_GROUP_HEH +@deftypevrx Constant int UC_JOINING_GROUP_HEH_GOAL +@deftypevrx Constant int UC_JOINING_GROUP_HETH +@deftypevrx Constant int UC_JOINING_GROUP_KAF +@deftypevrx Constant int UC_JOINING_GROUP_KAPH +@deftypevrx Constant int UC_JOINING_GROUP_KHAPH +@deftypevrx Constant int UC_JOINING_GROUP_KNOTTED_HEH +@deftypevrx Constant int UC_JOINING_GROUP_LAM +@deftypevrx Constant int UC_JOINING_GROUP_LAMADH +@deftypevrx Constant int UC_JOINING_GROUP_MEEM +@deftypevrx Constant int UC_JOINING_GROUP_MIM +@deftypevrx Constant int UC_JOINING_GROUP_NOON +@deftypevrx Constant int UC_JOINING_GROUP_NUN +@deftypevrx Constant int UC_JOINING_GROUP_NYA +@deftypevrx Constant int UC_JOINING_GROUP_PE +@deftypevrx Constant int UC_JOINING_GROUP_QAF +@deftypevrx Constant int UC_JOINING_GROUP_QAPH +@deftypevrx Constant int UC_JOINING_GROUP_REH +@deftypevrx Constant int UC_JOINING_GROUP_REVERSED_PE +@deftypevrx Constant int UC_JOINING_GROUP_SAD +@deftypevrx Constant int UC_JOINING_GROUP_SADHE +@deftypevrx Constant int UC_JOINING_GROUP_SEEN +@deftypevrx Constant int UC_JOINING_GROUP_SEMKATH +@deftypevrx Constant int UC_JOINING_GROUP_SHIN +@deftypevrx Constant int UC_JOINING_GROUP_SWASH_KAF +@deftypevrx Constant int UC_JOINING_GROUP_SYRIAC_WAW +@deftypevrx Constant int UC_JOINING_GROUP_TAH +@deftypevrx Constant int UC_JOINING_GROUP_TAW +@deftypevrx Constant int UC_JOINING_GROUP_TEH_MARBUTA +@deftypevrx Constant int UC_JOINING_GROUP_TEH_MARBUTA_GOAL +@deftypevrx Constant int UC_JOINING_GROUP_TETH +@deftypevrx Constant int UC_JOINING_GROUP_WAW +@deftypevrx Constant int UC_JOINING_GROUP_YEH +@deftypevrx Constant int UC_JOINING_GROUP_YEH_BARREE +@deftypevrx Constant int UC_JOINING_GROUP_YEH_WITH_TAIL +@deftypevrx Constant int UC_JOINING_GROUP_YUDH +@deftypevrx Constant int UC_JOINING_GROUP_YUDH_HE +@deftypevrx Constant int UC_JOINING_GROUP_ZAIN +@deftypevrx Constant int UC_JOINING_GROUP_ZHAIN +@end deftypevr + +The following functions implement the association between a joining group +and its name. + +@deftypefun {const char *} uc_joining_group_name (int @var{joining_group}) +Returns the name of a joining group. +@end deftypefun + +@deftypefun int uc_joining_group_byname (const char *@var{joining_group_name}) +Returns the joining group given by name, e.g.@ @code{"Teh_Marbuta"}. +@end deftypefun + +The following function gives the joining group of every Unicode character. + +@deftypefun int uc_joining_group (ucs4_t @var{uc}) +Returns the joining group of a Unicode character. +@end deftypefun + @node Properties @section Properties |