#
# Copyright (C) 2002-2010, International Business Machines Corporation 
# and others. All Rights Reserved.
#
# file:  word.txt
#
# ICU Word Break Rules
#      See Unicode Standard Annex #29.
#      These rules are based on UAX-29 Revision 16 for Unicode 6.0
#
# Note:  Updates to word.txt will usually need to be merged into
#        word_POSIX.txt and word_ja.txt also.

##############################################################################
#
#  Character class definitions from TR 29
#
##############################################################################

!!chain;


#
#  Character Class Definitions.
#

$CR           = [\p{Word_Break = CR}];
$LF           = [\p{Word_Break = LF}];
$Newline      = [\p{Word_Break = Newline}];
$Extend       = [\p{Word_Break = Extend}];
$Format       = [\p{Word_Break = Format}];
$Hiragana     = [:Hiragana:];
$Katakana     = [\p{Word_Break = Katakana}];
$Han          = [:Han:];
$ALetter      = [\p{Word_Break = ALetter}];
# Remove two full stop characters from $MidNumLet and add them to $MidNum
# to break a hostname into its components at the cost of breaking
# 'e.g.' and 'i.e.' as well.
# $MidNumLet is used in rules 6/7 (rules of our interest) and rules 11/12.
# Because it's OR'd with $MidNum in rules 11/12, rules 11/12 are not affected
# while rules 6/7 are reverted to the old behavior we want.
$MidNumLet    = [[\p{Word_Break = MidNumLet}] - [\u002E \uFF0E]];
$MidLetter    = [\p{Word_Break = MidLetter}];
$MidNum       = [\p{Word_Break = MidNum}[\u002E \uFF0E]];
$Numeric      = [\p{Word_Break = Numeric}[\uff10-\uff19]]; #includes fullwidth digits
$ExtendNumLet = [\p{Word_Break = ExtendNumLet}];

# Extra sets not to break 'HebrewLetter U+0022 HebrewLetter'.
$HebrewLet    = [\p{Word_Break = ALetter} & \p{Script = Hebrew} - [\u05F3]];
# U+05F3 is ALetter and U+05F4 is MidLetter so that they're covered by
# the current rule 6/7.
$HebrewMidLet = [\u0022];

#   Dictionary character set, for triggering language-based break engines. Currently
#   limited to LineBreak=Complex_Context and CJK. Note that this set only works
#   in Unicode 5.0 or later as the definition of Complex_Context was corrected to include all
#   characters requiring dictionary break.

$Control        = [\p{Grapheme_Cluster_Break = Control}]; 
$HangulSyllable = [\uac00-\ud7a3];
$ComplexContext = [:LineBreak = Complex_Context:];
$KanaKanji      = [$Han $Hiragana $Katakana];
$dictionaryCJK  = [$KanaKanji $HangulSyllable];
$dictionary     = [$ComplexContext $dictionaryCJK];

# leave CJK scripts out of ALetterPlus
$ALetterPlus  = [$ALetter-$dictionaryCJK [$ComplexContext-$Extend-$Control]];


#
#  Rules 4    Ignore Format and Extend characters, 
#             except when they appear at the beginning of a region of text.
#
# TODO: check if handling of katakana in dictionary makes rules incorrect/void.
$KatakanaEx     = $Katakana     ($Extend |  $Format)*;
$ALetterEx      = $ALetterPlus  ($Extend |  $Format)*;
$MidNumLetEx    = $MidNumLet    ($Extend |  $Format)*;
$MidLetterEx    = $MidLetter    ($Extend |  $Format)*;
$MidNumEx       = $MidNum       ($Extend |  $Format)*;
$NumericEx      = $Numeric      ($Extend |  $Format)*;
$ExtendNumLetEx = $ExtendNumLet ($Extend |  $Format)*;
$HebrewLetEx    = $HebrewLet    ($Extend |  $Format)*;

$Ideographic    = [\p{Ideographic}];
$HiraganaEx     = $Hiragana     ($Extend |  $Format)*;
$IdeographicEx  = $Ideographic  ($Extend |  $Format)*;

## -------------------------------------------------

!!forward;


# Rule 3 - CR x LF
#
$CR $LF;

# Rule 4 - ignore Format and Extend characters, except when they appear at the beginning
#          of a region of Text.   The rule here comes into play when the start of text
#          begins with a group of Format chars, or with a "word" consisting of a single
#          char that is not in any of the listed word break categories followed by
#          format char(s).
 #          format char(s), or is not a CJK dictionary character.
[^$CR $LF $Newline $dictionaryCJK]? ($Extend |  $Format)+;

$NumericEx {100};
$ALetterEx {200};
$HangulSyllable {200};
$KatakanaEx {400}; #originally 300
$HiraganaEx {400}; #originally 300
$IdeographicEx {400};    #

#
# rule 5
#    Do not break between most letters.
#
$ALetterEx $ALetterEx {200};

# rule 6 and 7
$ALetterEx ($MidLetterEx | $MidNumLetEx) $ALetterEx {200};

# Chrome addition
$HebrewLetEx $HebrewMidLet $HebrewLetEx {200};

# rule 8

$NumericEx $NumericEx {100};

# rule 9

$ALetterEx $NumericEx {200};

# rule 10

$NumericEx $ALetterEx {200};

# rule 11 and 12 

$NumericEx ($MidNumEx | $MidNumLetEx) $NumericEx {100};

# rule 13

# To be consistent with '$KanaKanji $KanaKanji', changed 
# from 300 to 400.
# See also TestRuleStatus in intltest/rbbiapts.cpp
$KatakanaEx  $KatakanaEx {400};

# rule 13a/b

$ALetterEx      $ExtendNumLetEx {200};    #  (13a)
$NumericEx      $ExtendNumLetEx {100};    #  (13a)
$KatakanaEx     $ExtendNumLetEx {400};    #  (13a)
$ExtendNumLetEx $ExtendNumLetEx {200};    #  (13a)

$ExtendNumLetEx $ALetterEx  {200};    #  (13b)
$ExtendNumLetEx $NumericEx  {100};    #  (13b)
$ExtendNumLetEx $KatakanaEx {400};    #  (13b)

# special handling for CJK characters: chain for later dictionary segmentation
$HangulSyllable $HangulSyllable {200};
$KanaKanji $KanaKanji {400}; #different rule status if both kanji and kana found


## -------------------------------------------------

!!reverse;

$BackALetterEx     = ($Format | $Extend)* $ALetterPlus;
$BackMidNumLetEx   = ($Format | $Extend)* $MidNumLet;
$BackNumericEx     = ($Format | $Extend)* $Numeric;
$BackMidNumEx      = ($Format | $Extend)* $MidNum;
$BackMidLetterEx   = ($Format | $Extend)* $MidLetter;
$BackKatakanaEx    = ($Format | $Extend)* $Katakana;
$BackHiraganaEx    = ($Extend | $Format)* $Hiragana;
$BackExtendNumLetEx= ($Format | $Extend)* $ExtendNumLet;
$BackHebrewLetEx   = ($Format | $Extend)* $HebrewLet;


# rule 3
$LF $CR;

# rule 4
($Format | $Extend)*  [^$CR $LF $Newline $dictionaryCJK]?;

# rule 5

$BackALetterEx $BackALetterEx;

# rule 6 and 7

$BackALetterEx ($BackMidLetterEx | $BackMidNumLetEx) $BackALetterEx;

# Chrome addition
$BackHebrewLetEx $HebrewMidLet $BackHebrewLetEx;

# rule 8

$BackNumericEx $BackNumericEx;

# rule 9

$BackNumericEx $BackALetterEx;

# rule 10

$BackALetterEx $BackNumericEx;

# rule 11 and 12

$BackNumericEx ($BackMidNumEx | $BackMidNumLetEx) $BackNumericEx;

# rule 13

$BackKatakanaEx $BackKatakanaEx;

# rules 13 a/b
#
$BackExtendNumLetEx ($BackALetterEx | $BackNumericEx | $BackKatakanaEx | $BackExtendNumLetEx);
($BackALetterEx | $BackNumericEx | $BackKatakanaEx) $BackExtendNumLetEx; 

# special handling for CJK characters: chain for later dictionary segmentation
$HangulSyllable $HangulSyllable;
$KanaKanji $KanaKanji; #different rule status if both kanji and kana found

## -------------------------------------------------

!!safe_reverse;

# rule 3
($Extend | $Format)+ .?;

# rule 6
($MidLetter | $MidNumLet) $BackALetterEx;

# rule 11
($MidNum | $MidNumLet) $BackNumericEx;

# For dictionary-based break
$dictionary $dictionary;

## -------------------------------------------------

!!safe_forward;

# rule 4
($Extend | $Format)+ .?;

# rule 6
($MidLetterEx | $MidNumLetEx) $ALetterEx;

# rule 11
($MidNumEx | $MidNumLetEx) $NumericEx;

# For dictionary-based break
$dictionary $dictionary;