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#
# Copyright (C) 2002-2013, International Business Machines Corporation and others.
# All Rights Reserved.
#
# file: char.txt
#
# ICU Character Break Rules, also known as Grapheme Cluster Boundaries
# See Unicode Standard Annex #29.
# These rules are based on UAX #29 Revision 20 for Unicode Version 6.2
#
#
# Character Class Definitions.
#
$CR = [\p{Grapheme_Cluster_Break = CR}];
$LF = [\p{Grapheme_Cluster_Break = LF}];
$Control = [\p{Grapheme_Cluster_Break = Control}];
# TODO: Restore if the Prepend set becomes non-empty again: $Prepend = [\p{Grapheme_Cluster_Break = Prepend}];
$Extend = [\p{Grapheme_Cluster_Break = Extend}];
$SpacingMark = [\p{Grapheme_Cluster_Break = SpacingMark}];
$Regional_Indicator = [\p{Grapheme_Cluster_Break = Regional_Indicator}];
#
# Korean Syllable Definitions
#
$L = [\p{Grapheme_Cluster_Break = L}];
$V = [\p{Grapheme_Cluster_Break = V}];
$T = [\p{Grapheme_Cluster_Break = T}];
$LV = [\p{Grapheme_Cluster_Break = LV}];
$LVT = [\p{Grapheme_Cluster_Break = LVT}];
## -------------------------------------------------
!!chain;
!!forward;
$CR $LF;
$L ($L | $V | $LV | $LVT);
($LV | $V) ($V | $T);
($LVT | $T) $T;
$Regional_Indicator $Regional_Indicator;
[^$Control $CR $LF] $Extend;
[^$Control $CR $LF] $SpacingMark;
# TODO: Restore if the Prepend set becomes non-empty again: $Prepend [^$Control $CR $LF];
## -------------------------------------------------
!!reverse;
$LF $CR;
($L | $V | $LV | $LVT) $L;
($V | $T) ($LV | $V);
$T ($LVT | $T);
$Regional_Indicator $Regional_Indicator;
$Extend [^$Control $CR $LF];
$SpacingMark [^$Control $CR $LF];
# TODO: Restore if the Prepend set becomes non-empty again: [^$Control $CR $LF] $Prepend;
## -------------------------------------------------
# We don't logically need safe char break rules, but if we don't provide any at all
# the engine for preceding() and following() will fall back to the
# old style inefficient algorithm.
!!safe_reverse;
$LF $CR;
## -------------------------------------------------
!!safe_forward;
$CR $LF;