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Lucene example source code file (Default.rbbi)

This example Lucene source code file (Default.rbbi) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

aletterex, cr, extend, extend, extendnumletex, format, format, katakanaex, lf, license, numericex, numericex, word_break, word_break

The Lucene Default.rbbi source code

#
# 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)

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Here is a short list of links related to this Lucene Default.rbbi source code file:



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