#

# Licensed to the Apache Software Foundation (ASF) under one or more

# contributor license agreements. See the NOTICE file distributed with

# this work for additional information regarding copyright ownership.

# The ASF licenses this file to You under the Apache License, Version 2.0

# (the "License"); you may not use this file except in compliance with

# the License. You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

#

# Default RBBI rules, based on UAX#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}];

$Katakana = [\p{Word_Break = Katakana}];

$ALetter = [\p{Word_Break = ALetter}];

$MidNumLet = [\p{Word_Break = MidNumLet}];

$MidLetter = [\p{Word_Break = MidLetter}];

$MidNum = [\p{Word_Break = MidNum}];

$Numeric = [\p{Word_Break = Numeric}[[:Decomposition_Type=Wide:]&[:General_Category=Decimal_Number:]]];

$ExtendNumLet = [\p{Word_Break = ExtendNumLet}];

# Dictionary character set, for triggering language-based break engines. Currently

# limited to LineBreak=Complex_Context. 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.

$dictionary = [:LineBreak = Complex_Context:];

$Control = [\p{Grapheme_Cluster_Break = Control}];

$ALetterPlus = [$ALetter [$dictionary-$Extend-$Control]]; # Note: default ALetter does not

# include the dictionary characters.

#

# Rules 4 Ignore Format and Extend characters,

# except when they appear at the beginning of a region of text.

#

$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)*;

$Hiragana = [\p{script=Hiragana}];

$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).

[^$CR $LF $Newline]? ($Extend | $Format)+;

$NumericEx {100};

$ALetterEx {200};

$KatakanaEx {300}; # note: these status values override those from rule 5

$HiraganaEx {300}; # by virtual of being numerically larger.

$IdeographicEx {400}; #

#

# rule 5

# Do not break between most letters.

#

$ALetterEx $ALetterEx {200};

# rule 6 and 7

$ALetterEx ($MidLetterEx | $MidNumLetEx) $ALetterEx {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

$KatakanaEx $KatakanaEx {300};

# rule 13a/b

$ALetterEx $ExtendNumLetEx {200}; # (13a)

$NumericEx $ExtendNumLetEx {100}; # (13a)

$KatakanaEx $ExtendNumLetEx {300}; # (13a)

$ExtendNumLetEx $ExtendNumLetEx {200}; # (13a)

$ExtendNumLetEx $ALetterEx {200}; # (13b)

$ExtendNumLetEx $NumericEx {100}; # (13b)

$ExtendNumLetEx $KatakanaEx {300}; # (13b)