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authorJörg Frings-Fürst <debian@jff-webhosting.net>2017-12-02 12:05:34 +0100
committerJörg Frings-Fürst <debian@jff-webhosting.net>2017-12-02 12:05:34 +0100
commit7c78c92a28ef43d68b172adf97fbd8a27be3baec (patch)
tree3a98b0d01865f5e00912521c58386eb008a70d07 /doc/unigbrk.texi
parent4d76768442551c97a85e6f133cb818d223012746 (diff)
parent3ee36dc9787cee6ab5314af8f9c01b05a50e7d9d (diff)
Merge branch 'feature/upstream' into develop
Diffstat (limited to 'doc/unigbrk.texi')
-rw-r--r--doc/unigbrk.texi30
1 files changed, 29 insertions, 1 deletions
diff --git a/doc/unigbrk.texi b/doc/unigbrk.texi
index 196bd9f..d7847cc 100644
--- a/doc/unigbrk.texi
+++ b/doc/unigbrk.texi
@@ -44,6 +44,11 @@ clusters in a string.
Returns the start of the next grapheme cluster following @var{s},
or @var{end} if no grapheme cluster break is encountered before it.
Returns NULL if and only if @code{@var{s} == @var{end}}.
+
+Note that these functions do not handle the case when a character
+outside of the range between @var{s} and @var{end} is needed to
+determine the boundary. Use @func{_grapheme_breaks} functions for such
+cases.
@end deftypefun
@deftypefun void u8_grapheme_prev (const uint8_t *@var{s}, const uint8_t *@var{start})
@@ -52,6 +57,11 @@ Returns NULL if and only if @code{@var{s} == @var{end}}.
Returns the start of the grapheme cluster preceding @var{s}, or
@var{start} if no grapheme cluster break is encountered before it.
Returns NULL if and only if @code{@var{s} == @var{start}}.
+
+Note that these functions do not handle the case when a character
+outside of the range between @var{start} and @var{s} is needed to
+determine the boundary. Use @func{_grapheme_breaks} functions for such
+cases.
@end deftypefun
The following functions determine all of the grapheme cluster
@@ -61,8 +71,9 @@ boundaries in a string.
@deftypefunx void u16_grapheme_breaks (const uint16_t *@var{s}, size_t @var{n}, char *@var{p})
@deftypefunx void u32_grapheme_breaks (const uint32_t *@var{s}, size_t @var{n}, char *@var{p})
@deftypefunx void ulc_grapheme_breaks (const char *@var{s}, size_t @var{n}, char *@var{p})
+@deftypefunx void uc_grapheme_breaks (const ucs_t *@var{s}, size_t @var{n}, char *@var{p})
Determines the grapheme cluster break points in @var{s}, an array of
-@var{n} units, and stores the result at @code{@var{p}[0..@var{n}-1]}.
+@var{n} units, and stores the result at @code{@var{p}[0..@var{nx}-1]}.
@table @asis
@item @code{@var{p}[i] = 1}
means that there is a grapheme cluster boundary between
@@ -73,6 +84,13 @@ same grapheme cluster.
@end table
@code{@var{p}[0]} is always set to 1, because there is always a
grapheme cluster break at start of text.
+
+In addition to the above variants for UTF-8, UTF-16, and UTF-32 strings,
+@code{<unigbrk.h>} provides another variant: @func{uc_grapheme_breaks}.
+
+This is similar to @func{u32_grapheme_breaks}, but it accepts any
+characters which may not be represented in UTF-32, such as control
+characters.
@end deftypefun
@node Grapheme cluster break property
@@ -99,6 +117,12 @@ property. More values may be added in the future.
@deftypevrx Constant int GBP_T
@deftypevrx Constant int GBP_LV
@deftypevrx Constant int GBP_LVT
+@deftypevrx Constant int GBP_RI
+@deftypevrx Constant int GBP_ZWJ
+@deftypevrx Constant int GBP_EB
+@deftypevrx Constant int GBP_EM
+@deftypevrx Constant int GBP_GAZ
+@deftypevrx Constant int GBP_EBG
@end deftypevr
The following function looks up the grapheme cluster break property of a
@@ -123,4 +147,8 @@ of text, respectively.
This implements the extended (not legacy) grapheme cluster rules
described in the Unicode standard, because the standard says that they
are preferred.
+
+Note that this function do not handle the case when three ore more
+consecutive characters are needed to determine the boundary. Use
+@func{uc_grapheme_breaks} for such cases.
@end deftypefun