1#
2#   Copyright (C) 2002-2003, International Business Machines Corporation and others.
3#       All Rights Reserved.
4#
5#   file:  edit_word.txt
6#
7#   ICU Word Break Rules
8#      See Unicode Standard Annex #29.
9#      These rules are based on Version 4.0.0, dated 2003-04-17
10#
11
12
13
14####################################################################################
15#
16#  Character class definitions from TR 29
17#
18####################################################################################
19$Katakana  = [[:Script = KATAKANA:] [:name = KATAKANA-HIRAGANA PROLONGED SOUND MARK:]
20                                   [:name = HALFWIDTH KATAKANA-HIRAGANA PROLONGED SOUND MARK:]
21                                   [:name = HALFWIDTH KATAKANA VOICED SOUND MARK:]
22                                   [:name = HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK:]];
23
24$Ideographic = [:Ideographic:];
25$Hangul = [:Script = HANGUL:];
26
27$ALetter   = [\u0002 [:Alphabetic:] [:name= NO-BREAK SPACE:] [:name= HEBREW PUNCTUATION GERESH:]
28                           - $Ideographic
29                           - $Katakana
30                           - $Hangul
31                           - [:Script = Thai:]
32                           - [:Script = Lao:]
33                           - [:Script = Hiragana:]];
34
35$MidLetter = [[:name = APOSTROPHE:] [:name = MIDDLE DOT:]  [:name = HEBREW PUNCTUATION GERSHAYIM:]
36              [:name = RIGHT SINGLE QUOTATION MARK:] [:name = HYPHENATION POINT:]];
37
38$MidNum    = [[:LineBreak = Infix_Numeric:] - [:name = FULL STOP:]];
39$Numeric   = [:LineBreak = Numeric:];
40
41
42$TheZWSP = \u200b;
43
44#
45#  Character Class Definitions.
46#    The names are those from TR29.
47#
48$CR         = \u000d;
49$LF         = \u000a;
50$Control    = [[[:Zl:] [:Zp:] [:Cc:] [:Cf:]] - $TheZWSP];
51$Extend     = [[:Grapheme_Extend = TRUE:]];
52
53
54
55
56####################################################################################
57#
58#  Word Break Rules.    Definitions and Rules specific to word break begin Here.
59#
60####################################################################################
61
62$Format    = [[:Cf:] - $TheZWSP];
63
64
65
66# Rule 3:  Treat a grapheme cluster as if it were a single character.
67#          Hangul Syllables are easier to deal with here than they are in Grapheme Clusters
68#          because we don't need to find the boundaries between adjacent syllables -
69#          they won't be word boundaries.
70#
71
72
73#
74#  "Extended"  definitions.  Grapheme Cluster + Format Chars, treated like the base char.
75#
76$ALetterEx    = $ALetter   $Extend*;
77$NumericEx    = $Numeric   $Extend*;
78$MidNumEx     = $MidNum    $Extend*;
79$MidLetterEx  = $MidLetter $Extend*;
80$KatakanaEx   = $Katakana  $Extend*;
81$IdeographicEx= $Ideographic  $Extend*;
82$HangulEx = $Hangul  $Extend*;
83$FormatEx     = $Format    $Extend*;
84
85
86#
87#  Numbers.  Rules 8, 11, 12 form the TR.
88#
89$NumberSequence = $NumericEx ($FormatEx* $MidNumEx? $FormatEx* $NumericEx)*;
90$NumberSequence {100};
91
92#
93#  Words.  Alpha-numerics.  Rule 5, 6, 7, 9, 10
94#     - must include at least one letter.
95#     - may include both letters and numbers.
96#     - may include  MideLetter, MidNumber punctuation.
97#
98$LetterSequence = $ALetterEx ($FormatEx* $MidLetterEx? $FormatEx* $ALetterEx)*;     # rules #6, #7
99($NumberSequence $FormatEx*)? $LetterSequence ($FormatEx* ($NumberSequence | $LetterSequence))* {200};
100
101# Punctuations by themselves
102[[:P:][:S:]-[:name = FULL STOP:]]*;
103[[:name = FULL STOP:]]*;
104
105#
106#  Do not break between Katakana.   Rule #13.
107#
108$KatakanaEx ($FormatEx* $KatakanaEx)* {300};
109[:Hiragana:] $Extend* {300};
110
111#
112#  Ideographic Characters.  Stand by themselves as words.
113#                           Separated from the "Everything Else" rule, below, only so that they
114#                           can be tagged with a return value.   TODO:  is this what we want?
115#
116$IdeographicEx ($FormatEx* $IdeographicEx)* {400};
117$HangulEx ($FormatEx* $HangulEx)* {400};
118
119#
120#  Everything Else, with no tag.
121#                   Non-Control chars combine with $Extend (combining) chars.
122#                   Controls are do not.
123#
124[^$Control [:Ideographic:]] $Extend*;
125$CR $LF;
126
127#
128#  Reverse Rules.   Back up over any of the chars that can group together.
129#                   (Reverse rules do not need to be exact; they can back up  too far,
130#                   but must back up at least enough, and must stop on a boundary.)
131#
132
133# NonStarters are the set of all characters that can appear at the 2nd - nth position of
134#    a word.   (They may also be the first.)   The reverse rule skips over these, until it
135#    reaches something that can only be the start (and probably only) char in a "word".
136#    A space or punctuation meets the test.
137#
138$NonStarters = [$Numeric $ALetter $Katakana $Ideographic $Hangul [:P:] [:S:] $MidLetter $MidNum $Extend $Format];
139
140#!.*;
141! ($NonStarters* | \n \r) .;
142
143