133 lines
4.5 KiB
Plaintext
133 lines
4.5 KiB
Plaintext
#
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# Copyright (C) 2002, 2003, International Business Machines Corporation and others.
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# All Rights Reserved.
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#
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# file: word.txt
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#
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# ICU Word Break Rules
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# See Unicode Standard Annex #29.
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# These rules are based on Version 4.0.0, dated 2003-04-17
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#
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####################################################################################
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#
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# Character class definitions from TR 29
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#
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####################################################################################
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$Katakana = [[:Script = KATAKANA:] [:name = KATAKANA-HIRAGANA PROLONGED SOUND MARK:]
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[:name = HALFWIDTH KATAKANA-HIRAGANA PROLONGED SOUND MARK:]
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[:name = HALFWIDTH KATAKANA VOICED SOUND MARK:]
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[:name = HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK:]];
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$ALetter = [[:Alphabetic:] [:name= HEBREW PUNCTUATION GERESH:]
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- [:Ideographic:]
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- $Katakana
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- [:Script = Thai:]
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- [:Script = Lao:]
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- [:Script = Hiragana:]];
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$MidLetter = [[:name = APOSTROPHE:] [:name = MIDDLE DOT:] [:name = HEBREW PUNCTUATION GERSHAYIM:]
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[:name = RIGHT SINGLE QUOTATION MARK:] [:name = HYPHENATION POINT:]];
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$MidNumLet = [[:name = FULL STOP:] [:name = COLON:]];
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$MidNum = [[:LineBreak = Infix_Numeric:] - $MidNumLet];
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$Numeric = [:LineBreak = Numeric:];
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#
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# Character Class Definitions.
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# The names are those from TR29.
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#
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$CR = \u000d;
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$LF = \u000a;
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$Control = [[:Zl:] [:Zp:] [:Cc:] [:Cf:]];
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$Extend = [[:Grapheme_Extend = TRUE:]];
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####################################################################################
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#
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# Word Break Rules. Definitions and Rules specific to word break begin Here.
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#
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####################################################################################
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$Format = [[:Cf:]];
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# Rule 3: Treat a grapheme cluster as if it were a single character.
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# Hangul Syllables are easier to deal with here than they are in Grapheme Clusters
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# because we don't need to find the boundaries between adjacent syllables -
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# they won't be word boundaries.
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#
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#
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# "Extended" definitions. Grapheme Cluster + Format Chars, treated like the base char.
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#
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$ALetterEx = $ALetter $Extend*;
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$NumericEx = $Numeric $Extend*;
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$MidNumEx = $MidNum $Extend*;
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$MidNumLetEx = $MidNumLet $Extend*;
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$MidLetterEx = $MidLetter $Extend*;
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$KatakanaEx = $Katakana $Extend*;
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$FormatEx = $Format $Extend*;
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#
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# Numbers. Rules 8, 11, 12 form the TR.
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#
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$NumberSequence = $NumericEx ($FormatEx* ($MidNumEx | $MidNumLetEx)? $FormatEx* $NumericEx)*;
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$NumberSequence {100};
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#
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# Words. Alpha-numerics. Rule 5, 6, 7, 9, 10
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# - must include at least one letter.
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# - may include both letters and numbers.
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# - may include MideLetter, MidNumber punctuation.
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#
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$LetterSequence = $ALetterEx ($FormatEx* ($MidLetterEx | $MidNumLetEx)? $FormatEx* $ALetterEx)*; # rules #6, #7
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($NumberSequence $FormatEx*)? $LetterSequence ($FormatEx* ($NumberSequence | $LetterSequence))* {200};
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#
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# Do not break between Katakana. Rule #13.
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#
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$KatakanaEx ($FormatEx* $KatakanaEx)* {300};
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[:Hiragana:] $Extend* {300};
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#
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# Ideographic Characters. Stand by themselves as words.
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# Separated from the "Everything Else" rule, below, only so that they
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# can be tagged with a return value. TODO: is this what we want?
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#
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[:IDEOGRAPHIC:] $Extend* {400};
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#
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# Everything Else, with no tag.
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# Non-Control chars combine with $Extend (combining) chars.
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# Controls are do not.
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#
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[^$Control [:Ideographic:]] $Extend*;
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$CR $LF;
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#
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# Reverse Rules. Back up over any of the chars that can group together.
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# (Reverse rules do not need to be exact; they can back up too far,
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# but must back up at least enough, and must stop on a boundary.)
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#
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# NonStarters are the set of all characters that can appear at the 2nd - nth position of
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# a word. (They may also be the first.) The reverse rule skips over these, until it
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# reaches something that can only be the start (and probably only) char in a "word".
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# A space or punctuation meets the test.
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#
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$NonStarters = [$Numeric $ALetter $Katakana $MidLetter $MidNum $MidNumLet $Extend $Format];
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#!.*;
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! ($NonStarters* | \n \r) .;
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