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-@node unigbrk.h
-@chapter Grapheme cluster breaks in strings @code{<unigbrk.h>}
-
-@cindex grapheme cluster breaks
-@cindex grapheme cluster boundaries
-@cindex breaks, grapheme cluster
-@cindex boundaries, between grapheme clusters
-This include file declares functions for determining where in a string
-``grapheme clusters'' start and end.  A ``grapheme cluster'' is an
-approximation to a user-perceived character, which sometimes
-corresponds to multiple Unicode characters.  Editing operations such as
-mouse selection, cursor movement, and backspacing often operate on
-grapheme clusters as units, not on individual characters.
-
-Some grapheme clusters are built from a base character and a combining
-character.  The letter @samp{@'e},
-for example, is most commonly represented in Unicode as a single
-character U+00E8 @sc{LATIN SMALL LETTER E WITH ACUTE}.  It is,
-however, equally valid to use the pair of characters U+0065 @sc{LATIN
-SMALL LETTER E} followed by U+0301 @sc{COMBINING ACUTE ACCENT}.  Since
-the user would perceive this pair of characters as a single character,
-they would be grouped into a single grapheme cluster.
-
-But there are also grapheme clusters that consist of several base characters.
-For example, a Devanagari letter and a Devanagari vowel sign that follows it
-may form a grapheme cluster.  Similarly, some pairs of Thai characters and
-Hangul syllables (formed by two or three Hangul characters) are grapheme
-clusters.
-
-@menu
-* Grapheme cluster breaks in a string::
-* Grapheme cluster break property::
-@end menu
-
-@node Grapheme cluster breaks in a string
-@section Grapheme cluster breaks in a string
-
-The following functions find a single boundary between grapheme
-clusters in a string.
-
-@deftypefun void u8_grapheme_next (const uint8_t *@var{s}, const uint8_t *@var{end})
-@deftypefunx void u16_grapheme_next (const uint16_t *@var{s}, const uint16_t *@var{end})
-@deftypefunx void u32_grapheme_next (const uint32_t *@var{s}, const uint32_t *@var{end})
-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}}.
-@end deftypefun
-
-@deftypefun void u8_grapheme_prev (const uint8_t *@var{s}, const uint8_t *@var{start})
-@deftypefunx void u16_grapheme_prev (const uint16_t *@var{s}, const uint16_t *@var{start})
-@deftypefunx void u32_grapheme_prev (const uint32_t *@var{s}, const uint32_t *@var{start})
-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}}.
-@end deftypefun
-
-The following functions determine all of the grapheme cluster
-boundaries in a string.
-
-@deftypefun void u8_grapheme_breaks (const uint8_t *@var{s}, size_t @var{n}, char *@var{p})
-@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})
-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]}.
-@table @asis
-@item @code{@var{p}[i] = 1}
-means that there is a grapheme cluster boundary between
-@code{@var{s}[i-1]} and @code{@var{s}[i]}.
-@item @code{@var{p}[i] = 0}
-means that @code{@var{s}[i-1]} and @code{@var{s}[i]} are part of the
-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.
-@end deftypefun
-
-@node Grapheme cluster break property
-@section Grapheme cluster break property
-
-This is a more low-level API.  The grapheme cluster break property is a
-property defined in Unicode Standard Annex #29, section ``Grapheme Cluster
-Boundaries'', see
-@url{http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries}.@texnl{}
-It is used for determining the grapheme cluster breaks in a string.
-
-The following are the possible values of the grapheme cluster break
-property.  More values may be added in the future.
-
-@deftypevr Constant int GBP_OTHER
-@deftypevrx Constant int GBP_CR
-@deftypevrx Constant int GBP_LF
-@deftypevrx Constant int GBP_CONTROL
-@deftypevrx Constant int GBP_EXTEND
-@deftypevrx Constant int GBP_PREPEND
-@deftypevrx Constant int GBP_SPACINGMARK
-@deftypevrx Constant int GBP_L
-@deftypevrx Constant int GBP_V
-@deftypevrx Constant int GBP_T
-@deftypevrx Constant int GBP_LV
-@deftypevrx Constant int GBP_LVT
-@end deftypevr
-
-The following function looks up the grapheme cluster break property of a
-character.
-
-@deftypefun int uc_graphemeclusterbreak_property (ucs4_t @var{uc})
-Returns the Grapheme_Cluster_Break property of a Unicode character.
-@end deftypefun
-
-The following function determines whether there is a grapheme cluster
-break between two Unicode characters.  It is the primitive upon which
-the higher-level functions in the previous section are directly based.
-
-@deftypefun bool uc_is_grapheme_break (ucs4_t @var{a}, ucs4_t @var{b})
-Returns true if there is an grapheme cluster boundary between Unicode
-characters @var{a} and @var{b}.
-
-There is always a grapheme cluster break at the start or end of text.
-You can specify zero for @var{a} or @var{b} to indicate start of text or end
-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.
-@end deftypefun