125 lines
3.7 KiB
Plaintext
125 lines
3.7 KiB
Plaintext
#
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# Copyright (C) 2002-2006, International Business Machines Corporation and others.
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# All Rights Reserved.
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#
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# file: sent.txt
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#
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# ICU Sentence Break Rules
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# See Unicode Standard Annex #29.
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# These rules are based on SA 29 version 5.0.0
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# Includes post 5.0 changes to treat Japanese half width voicing marks
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# as Grapheme Extend.
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#
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$VoiceMarks = [\uff9e\uff9f];
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#
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# Character categories as defined in TR 29
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#
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$Sep = [\p{Sentence_Break = Sep}];
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$Format = [\p{Sentence_Break = Format}];
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$Sp = [\p{Sentence_Break = Sp}];
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$Lower = [\p{Sentence_Break = Lower}];
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$Upper = [\p{Sentence_Break = Upper}];
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$OLetter = [\p{Sentence_Break = OLetter}-$VoiceMarks];
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$Numeric = [\p{Sentence_Break = Numeric}];
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$ATerm = [\p{Sentence_Break = ATerm}];
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$STerm = [\p{Sentence_Break = STerm}];
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$Close = [\p{Sentence_Break = Close}];
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#
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# Define extended forms of the character classes,
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# incorporate grapheme cluster + format chars.
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# Rules 4 and 5.
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$CR = \u000d;
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$LF = \u000a;
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$Extend = [[:Grapheme_Extend = TRUE:]$VoiceMarks];
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$SpEx = $Sp ($Extend | $Format)*;
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$LowerEx = $Lower ($Extend | $Format)*;
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$UpperEx = $Upper ($Extend | $Format)*;
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$OLetterEx = $OLetter ($Extend | $Format)*;
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$NumericEx = $Numeric ($Extend | $Format)*;
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$ATermEx = $ATerm ($Extend | $Format)*;
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$STermEx = $STerm ($Extend | $Format)*;
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$CloseEx = $Close ($Extend | $Format)*;
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## -------------------------------------------------
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!!chain;
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!!forward;
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# Rule 3 - break after separators. Keep CR/LF together.
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#
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$CR $LF;
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# Rule 4 - Break after $Sep.
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# Rule 5 - Ignore $Format and $Extend
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#
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[^$Sep]? ($Extend | $Format)*;
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# Rule 6
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$ATermEx $NumericEx;
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# Rule 7
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$UpperEx $ATermEx $UpperEx;
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#Rule 8
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# Note: follows errata for Unicode 5.0 boundary rules.
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$NotLettersEx = [^$OLetter $Upper $Lower $Sep $ATerm $STerm] ($Extend | $Format)*;
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$ATermEx $CloseEx* $SpEx* $NotLettersEx* $Lower;
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# Rule 8a
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($STermEx | $ATermEx) $CloseEx* $SpEx* ($STermEx | $ATermEx);
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#Rule 9, 10, 11
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($STermEx | $ATermEx) $CloseEx* $SpEx* $Sep?;
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#Rule 12
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[[^$STerm $ATerm $Close $Sp $Sep $Format $Extend]{bof}] ($Extend | $Format | $Close | $Sp)* .;
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[[^$STerm $ATerm $Close $Sp $Sep $Format $Extend]{bof}] ($Extend | $Format | $Close | $Sp)* ([$Sep{eof}] | $CR $LF){100};
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## -------------------------------------------------
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!!reverse;
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$SpEx_R = ($Extend | $Format)* $Sp;
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$ATermEx_R = ($Extend | $Format)* $ATerm;
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$STermEx_R = ($Extend | $Format)* $STerm;
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$CloseEx_R = ($Extend | $Format)* $Close;
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#
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# Reverse rules.
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# For now, use the old style inexact reverse rules, which are easier
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# to write, but less efficient.
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# TODO: exact reverse rules. It appears that exact reverse rules
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# may require improving support for look-ahead breaks in the
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# builder. Needs more investigation.
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#
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[{bof}] (.? | $LF $CR) [^$Sep]* [$Sep {eof}] ($SpEx_R* $CloseEx_R* ($STermEx_R | $ATermEx_R))*;
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#.*;
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# Explanation for this rule:
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#
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# It needs to back over
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# The $Sep at which we probably begin
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# All of the non $Sep chars leading to the preceding $Sep
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# The preceding $Sep, which will be the second one that the rule matches.
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# Any immediately preceding STerm or ATerm sequences. We need to see these
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# to get the correct rule status when moving forwards again.
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#
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# [{bof}] inhibit rule chaining. Without this, rule would loop on itself and match
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# the entire string.
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#
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# (.? | $LF $CR) Match one $Sep instance. Use .? rather than $Sep because position might be
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# at the beginning of the string at this point, and we don't want to fail.
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# Can only use {eof} once, and it is used later.
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#
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