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# Copyright (C) 2016 and later: Unicode, Inc. and others.
# License & terms of use: http://www.unicode.org/copyright.html
#
# Copyright (C) 2002-2015, International Business Machines Corporation and others.
# All Rights Reserved.
#
# file: sent.txt
#
# ICU Sentence Break Rules
# See Unicode Standard Annex #29.
# These rules are based on UAX #29 Revision 34 for Unicode Version 12.0
#
!!quoted_literals_only;
#
# Character categories as defined in TR 29
#
$CR = [\p{Sentence_Break = CR}];
$LF = [\p{Sentence_Break = LF}];
$Extend = [\p{Sentence_Break = Extend}];
$Sep = [\p{Sentence_Break = Sep}];
$Format = [\p{Sentence_Break = Format}];
$Sp = [\p{Sentence_Break = Sp}];
$Lower = [\p{Sentence_Break = Lower}];
$Upper = [\p{Sentence_Break = Upper}];
$OLetter = [\p{Sentence_Break = OLetter}];
$Numeric = [\p{Sentence_Break = Numeric}];
$ATerm = [\p{Sentence_Break = ATerm}];
$SContinue = [\p{Sentence_Break = SContinue}];
$STerm = [\p{Sentence_Break = STerm}];
$Close = [\p{Sentence_Break = Close}];
#
# Define extended forms of the character classes,
# incorporate trailing Extend or Format chars.
# Rules 4 and 5.
$SpEx = $Sp ($Extend | $Format)*;
$LowerEx = $Lower ($Extend | $Format)*;
$UpperEx = $Upper ($Extend | $Format)*;
$OLetterEx = $OLetter ($Extend | $Format)*;
$NumericEx = $Numeric ($Extend | $Format)*;
$ATermEx = $ATerm ($Extend | $Format)*;
$SContinueEx= $SContinue ($Extend | $Format)*;
$STermEx = $STerm ($Extend | $Format)*;
$CloseEx = $Close ($Extend | $Format)*;
## -------------------------------------------------
!!chain;
# Rule 3 - break after separators. Keep CR/LF together.
#
$CR $LF;
# Rule 4 - Break after $Sep.
# Rule 5 - Ignore $Format and $Extend
#
[^$Sep $CR $LF]? ($Extend | $Format)*;
# Rule 6
$ATermEx $NumericEx;
# Rule 7
($UpperEx | $LowerEx) $ATermEx $UpperEx;
#Rule 8
$NotLettersEx = [^$OLetter $Upper $Lower $Sep $CR $LF $ATerm $STerm] ($Extend | $Format)*;
$ATermEx $CloseEx* $SpEx* $NotLettersEx* $Lower;
# Rule 8a
($STermEx | $ATermEx) $CloseEx* $SpEx* ($SContinueEx | $STermEx | $ATermEx);
#Rule 9, 10, 11
($STermEx | $ATermEx) $CloseEx* $SpEx* ($Sep | $CR | $LF)?;
#Rule 998
[[^$STerm $ATerm $Close $Sp $Sep $LF $CR $Format $Extend]{bof}] ($Extend | $Format | $Close | $Sp)* .;
[[^$STerm $ATerm $Close $Sp $Sep $LF $CR $Format $Extend]{bof}] ($Extend | $Format | $Close | $Sp)* ([$Sep $LF $CR {eof}] | $CR $LF){100};
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