215 lines
5.4 KiB
Plaintext
215 lines
5.4 KiB
Plaintext
#
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# Copyright (C) 2002-2009, International Business Machines Corporation
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# and others. 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 UAX-29 Revision 13 for Unicode 5.1
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#
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# Note: Updates to word.txt will usually need to be merged into
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# word_POSIX.txt and word_ja.txt also.
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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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!!chain;
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#
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# Character Class Definitions.
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#
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$CR = [\p{Word_Break = CR}];
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$LF = [\p{Word_Break = LF}];
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$Newline = [\p{Word_Break = Newline}];
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$Extend = [\p{Word_Break = Extend}];
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$Format = [\p{Word_Break = Format}];
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$Katakana = [\p{Word_Break = Katakana}];
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$ALetter = [\p{Word_Break = ALetter}];
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$MidNumLet = [\p{Word_Break = MidNumLet}];
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$MidLetter = [\p{Word_Break = MidLetter}];
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$MidNum = [\p{Word_Break = MidNum}];
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$Numeric = [\p{Word_Break = Numeric}];
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$ExtendNumLet = [\p{Word_Break = ExtendNumLet}];
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# Dictionary character set, for triggering language-based break engines. Currently
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# limited to LineBreak=Complex_Context. Note that this set only works in Unicode
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# 5.0 or later as the definition of Complex_Context was corrected to include all
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# characters requiring dictionary break.
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$dictionary = [:LineBreak = Complex_Context:];
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$Control = [\p{Grapheme_Cluster_Break = Control}];
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$ALetterPlus = [$ALetter [$dictionary-$Extend-$Control]]; # Note: default ALetter does not
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# include the dictionary characters.
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#
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# Rules 4 Ignore Format and Extend characters,
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# except when they appear at the beginning of a region of text.
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#
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$KatakanaEx = $Katakana ($Extend | $Format)*;
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$ALetterEx = $ALetterPlus ($Extend | $Format)*;
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$MidNumLetEx = $MidNumLet ($Extend | $Format)*;
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$MidLetterEx = $MidLetter ($Extend | $Format)*;
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$MidNumEx = $MidNum ($Extend | $Format)*;
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$NumericEx = $Numeric ($Extend | $Format)*;
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$ExtendNumLetEx = $ExtendNumLet ($Extend | $Format)*;
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$Hiragana = [\p{script=Hiragana}];
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$Ideographic = [\p{Ideographic}];
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$HiraganaEx = $Hiragana ($Extend | $Format)*;
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$IdeographicEx = $Ideographic ($Extend | $Format)*;
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## -------------------------------------------------
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!!forward;
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# Rule 3 - CR x LF
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#
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$CR $LF;
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# Rule 4 - ignore Format and Extend characters, except when they appear at the beginning
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# of a region of Text. The rule here comes into play when the start of text
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# begins with a group of Format chars, or with a "word" consisting of a single
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# char that is not in any of the listed word break categories followed by
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# format char(s).
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[^$CR $LF $Newline]? ($Extend | $Format)+;
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$NumericEx {100};
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$ALetterEx {200};
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$KatakanaEx {300}; # note: these status values override those from rule 5
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$HiraganaEx {300}; # by virtual of being numerically larger.
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$IdeographicEx {400}; #
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#
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# rule 5
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# Do not break between most letters.
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#
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$ALetterEx $ALetterEx {200};
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# rule 6 and 7
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$ALetterEx ($MidLetterEx | $MidNumLetEx) $ALetterEx {200};
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# rule 8
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$NumericEx $NumericEx {100};
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# rule 9
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$ALetterEx $NumericEx {200};
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# rule 10
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$NumericEx $ALetterEx {200};
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# rule 11 and 12
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$NumericEx ($MidNumEx | $MidNumLetEx) $NumericEx {100};
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# rule 13
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$KatakanaEx $KatakanaEx {300};
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# rule 13a/b
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$ALetterEx $ExtendNumLetEx {200}; # (13a)
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$NumericEx $ExtendNumLetEx {100}; # (13a)
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$KatakanaEx $ExtendNumLetEx {300}; # (13a)
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$ExtendNumLetEx $ExtendNumLetEx {200}; # (13a)
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$ExtendNumLetEx $ALetterEx {200}; # (13b)
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$ExtendNumLetEx $NumericEx {100}; # (13b)
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$ExtendNumLetEx $KatakanaEx {300}; # (13b)
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## -------------------------------------------------
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!!reverse;
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$BackALetterEx = ($Format | $Extend)* $ALetterPlus;
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$BackMidNumLetEx = ($Format | $Extend)* $MidNumLet;
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$BackNumericEx = ($Format | $Extend)* $Numeric;
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$BackMidNumEx = ($Format | $Extend)* $MidNum;
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$BackMidLetterEx = ($Format | $Extend)* $MidLetter;
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$BackKatakanaEx = ($Format | $Extend)* $Katakana;
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$BackExtendNumLetEx= ($Format | $Extend)* $ExtendNumLet;
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# rule 3
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$LF $CR;
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# rule 4
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($Format | $Extend)* [^$CR $LF $Newline]?;
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# rule 5
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$BackALetterEx $BackALetterEx;
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# rule 6 and 7
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$BackALetterEx ($BackMidLetterEx | $BackMidNumLetEx) $BackALetterEx;
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# rule 8
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$BackNumericEx $BackNumericEx;
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# rule 9
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$BackNumericEx $BackALetterEx;
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# rule 10
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$BackALetterEx $BackNumericEx;
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# rule 11 and 12
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$BackNumericEx ($BackMidNumEx | $BackMidNumLetEx) $BackNumericEx;
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# rule 13
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$BackKatakanaEx $BackKatakanaEx;
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# rules 13 a/b
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#
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$BackExtendNumLetEx ($BackALetterEx | $BackNumericEx | $BackKatakanaEx | $BackExtendNumLetEx);
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($BackALetterEx | $BackNumericEx | $BackKatakanaEx) $BackExtendNumLetEx;
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## -------------------------------------------------
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!!safe_reverse;
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# rule 3
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($Extend | $Format)+ .?;
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# rule 6
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($MidLetter | $MidNumLet) $BackALetterEx;
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# rule 11
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($MidNum | $MidNumLet) $BackNumericEx;
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# For dictionary-based break
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$dictionary $dictionary;
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## -------------------------------------------------
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!!safe_forward;
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# rule 4
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($Extend | $Format)+ .?;
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# rule 6
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($MidLetterEx | $MidNumLetEx) $ALetterEx;
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# rule 11
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($MidNumEx | $MidNumLetEx) $NumericEx;
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# For dictionary-based break
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$dictionary $dictionary;
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