1# Copyright (C) 2016 and later: Unicode, Inc. and others.
2# License & terms of use: http://www.unicode.org/copyright.html
3#
4#   Copyright (C) 2002-2015, International Business Machines Corporation and others.
5#       All Rights Reserved.
6#
7#   file:  sent.txt
8#
9#   ICU Sentence Break Rules
10#      See Unicode Standard Annex #29.
11#      These rules are based on UAX #29 Revision 26 for Unicode Version 8.0
12#
13
14!!quoted_literals_only;
15
16#
17# Character categories as defined in TR 29
18#
19$CR        = [\p{Sentence_Break = CR}];
20$LF        = [\p{Sentence_Break = LF}];
21$Extend    = [\p{Sentence_Break = Extend}];
22$Sep       = [\p{Sentence_Break = Sep}];
23$Format    = [\p{Sentence_Break = Format}];
24$Sp        = [\p{Sentence_Break = Sp}];
25$Lower     = [\p{Sentence_Break = Lower}];
26$Upper     = [\p{Sentence_Break = Upper}];
27$OLetter   = [\p{Sentence_Break = OLetter}];
28$Numeric   = [\p{Sentence_Break = Numeric}];
29$ATerm     = [\p{Sentence_Break = ATerm}];
30$SContinue = [\p{Sentence_Break = SContinue}];
31$STerm     = [\p{Sentence_Break = STerm}];
32$Close     = [\p{Sentence_Break = Close}];
33
34#
35# Define extended forms of the character classes,
36#   incorporate trailing Extend or Format chars.
37#   Rules 4 and 5.
38
39$SpEx       = $Sp      ($Extend | $Format)*;
40$LowerEx    = $Lower   ($Extend | $Format)*;
41$UpperEx    = $Upper   ($Extend | $Format)*;
42$OLetterEx  = $OLetter ($Extend | $Format)*;
43$NumericEx  = $Numeric ($Extend | $Format)*;
44$ATermEx    = $ATerm   ($Extend | $Format)*;
45$SContinueEx= $SContinue ($Extend | $Format)*;
46$STermEx    = $STerm   ($Extend | $Format)*;
47$CloseEx    = $Close   ($Extend | $Format)*;
48
49
50## -------------------------------------------------
51
52!!chain;
53
54# Rule 3 - break after separators.  Keep CR/LF together.
55#
56$CR $LF;
57
58
59# Rule 4 - Break after $Sep.
60# Rule 5 - Ignore $Format and $Extend
61#
62[^$Sep $CR $LF]? ($Extend | $Format)*;
63
64
65# Rule 6
66$ATermEx $NumericEx;
67
68# Rule 7
69($UpperEx | $LowerEx) $ATermEx $UpperEx;
70
71#Rule 8
72$NotLettersEx = [^$OLetter $Upper $Lower $Sep $CR $LF $ATerm $STerm] ($Extend | $Format)*;
73$ATermEx $CloseEx* $SpEx* $NotLettersEx* $Lower;
74
75# Rule 8a
76($STermEx | $ATermEx) $CloseEx* $SpEx* ($SContinueEx | $STermEx | $ATermEx);
77
78#Rule 9, 10, 11
79($STermEx | $ATermEx) $CloseEx* $SpEx* ($Sep | $CR | $LF)?;
80
81#Rule 12
82[[^$STerm $ATerm $Close $Sp $Sep $LF $CR $Format $Extend]{bof}] ($Extend | $Format | $Close | $Sp)* .;
83[[^$STerm $ATerm $Close $Sp $Sep $LF $CR $Format $Extend]{bof}] ($Extend | $Format | $Close | $Sp)* ([$Sep $LF $CR {eof}] | $CR $LF){100};
84