org.apache.lucene.analysis.standard.std31.StandardTokenizerImpl31.jflex Maven / Gradle / Ivy
package org.apache.lucene.analysis.standard.std31;
/*
* 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.
*/
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.lucene.analysis.standard.StandardTokenizerInterface;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
@Deprecated
/**
* This class implements StandardTokenizer, except with a bug
* (https://issues.apache.org/jira/browse/LUCENE-3358) where Han and Hiragana
* characters would be split from combining characters:
* @deprecated This class is only for exact backwards compatibility
*/
%%
%unicode 6.0
%integer
%final
%public
%class StandardTokenizerImpl31
%implements StandardTokenizerInterface
%function getNextToken
%char
%buffer 4096
%include SUPPLEMENTARY.jflex-macro
ALetter = ([\p{WB:ALetter}] | {ALetterSupp})
Format = ([\p{WB:Format}] | {FormatSupp})
Numeric = ([\p{WB:Numeric}] | {NumericSupp})
Extend = ([\p{WB:Extend}] | {ExtendSupp})
Katakana = ([\p{WB:Katakana}] | {KatakanaSupp})
MidLetter = ([\p{WB:MidLetter}] | {MidLetterSupp})
MidNum = ([\p{WB:MidNum}] | {MidNumSupp})
MidNumLet = ([\p{WB:MidNumLet}] | {MidNumLetSupp})
ExtendNumLet = ([\p{WB:ExtendNumLet}] | {ExtendNumLetSupp})
ComplexContext = ([\p{LB:Complex_Context}] | {ComplexContextSupp})
Han = ([\p{Script:Han}] | {HanSupp})
Hiragana = ([\p{Script:Hiragana}] | {HiraganaSupp})
// Script=Hangul & Aletter
HangulEx = (!(!\p{Script:Hangul}|!\p{WB:ALetter})) ({Format} | {Extend})*
// UAX#29 WB4. X (Extend | Format)* --> X
//
ALetterEx = {ALetter} ({Format} | {Extend})*
// TODO: Convert hard-coded full-width numeric range to property intersection (something like [\p{Full-Width}&&\p{Numeric}]) once JFlex supports it
NumericEx = ({Numeric} | [\uFF10-\uFF19]) ({Format} | {Extend})*
KatakanaEx = {Katakana} ({Format} | {Extend})*
MidLetterEx = ({MidLetter} | {MidNumLet}) ({Format} | {Extend})*
MidNumericEx = ({MidNum} | {MidNumLet}) ({Format} | {Extend})*
ExtendNumLetEx = {ExtendNumLet} ({Format} | {Extend})*
%{
/** Alphanumeric sequences */
public static final int WORD_TYPE = StandardTokenizer.ALPHANUM;
/** Numbers */
public static final int NUMERIC_TYPE = StandardTokenizer.NUM;
/**
* Chars in class \p{Line_Break = Complex_Context} are from South East Asian
* scripts (Thai, Lao, Myanmar, Khmer, etc.). Sequences of these are kept
* together as as a single token rather than broken up, because the logic
* required to break them at word boundaries is too complex for UAX#29.
*
* See Unicode Line Breaking Algorithm: http://www.unicode.org/reports/tr14/#SA
*/
public static final int SOUTH_EAST_ASIAN_TYPE = StandardTokenizer.SOUTHEAST_ASIAN;
public static final int IDEOGRAPHIC_TYPE = StandardTokenizer.IDEOGRAPHIC;
public static final int HIRAGANA_TYPE = StandardTokenizer.HIRAGANA;
public static final int KATAKANA_TYPE = StandardTokenizer.KATAKANA;
public static final int HANGUL_TYPE = StandardTokenizer.HANGUL;
public final int yychar()
{
return yychar;
}
/**
* Fills CharTermAttribute with the current token text.
*/
public final void getText(CharTermAttribute t) {
t.copyBuffer(zzBuffer, zzStartRead, zzMarkedPos-zzStartRead);
}
%}
%%
// UAX#29 WB1. sot ÷
// WB2. ÷ eot
//
<> { return StandardTokenizerInterface.YYEOF; }
// UAX#29 WB8. Numeric × Numeric
// WB11. Numeric (MidNum | MidNumLet) × Numeric
// WB12. Numeric × (MidNum | MidNumLet) Numeric
// WB13a. (ALetter | Numeric | Katakana | ExtendNumLet) × ExtendNumLet
// WB13b. ExtendNumLet × (ALetter | Numeric | Katakana)
//
{ExtendNumLetEx}* {NumericEx} ({ExtendNumLetEx}+ {NumericEx}
| {MidNumericEx} {NumericEx}
| {NumericEx})*
{ExtendNumLetEx}*
{ return NUMERIC_TYPE; }
// subset of the below for typing purposes only!
{HangulEx}+
{ return HANGUL_TYPE; }
{KatakanaEx}+
{ return KATAKANA_TYPE; }
// UAX#29 WB5. ALetter × ALetter
// WB6. ALetter × (MidLetter | MidNumLet) ALetter
// WB7. ALetter (MidLetter | MidNumLet) × ALetter
// WB9. ALetter × Numeric
// WB10. Numeric × ALetter
// WB13. Katakana × Katakana
// WB13a. (ALetter | Numeric | Katakana | ExtendNumLet) × ExtendNumLet
// WB13b. ExtendNumLet × (ALetter | Numeric | Katakana)
//
{ExtendNumLetEx}* ( {KatakanaEx} ({ExtendNumLetEx}* {KatakanaEx})*
| ( {NumericEx} ({ExtendNumLetEx}+ {NumericEx} | {MidNumericEx} {NumericEx} | {NumericEx})*
| {ALetterEx} ({ExtendNumLetEx}+ {ALetterEx} | {MidLetterEx} {ALetterEx} | {ALetterEx})* )+ )
({ExtendNumLetEx}+ ( {KatakanaEx} ({ExtendNumLetEx}* {KatakanaEx})*
| ( {NumericEx} ({ExtendNumLetEx}+ {NumericEx} | {MidNumericEx} {NumericEx} | {NumericEx})*
| {ALetterEx} ({ExtendNumLetEx}+ {ALetterEx} | {MidLetterEx} {ALetterEx} | {ALetterEx})* )+ ) )*
{ExtendNumLetEx}*
{ return WORD_TYPE; }
// From UAX #29:
//
// [C]haracters with the Line_Break property values of Contingent_Break (CB),
// Complex_Context (SA/South East Asian), and XX (Unknown) are assigned word
// boundary property values based on criteria outside of the scope of this
// annex. That means that satisfactory treatment of languages like Chinese
// or Thai requires special handling.
//
// In Unicode 6.0, only one character has the \p{Line_Break = Contingent_Break}
// property: U+FFFC (  ) OBJECT REPLACEMENT CHARACTER.
//
// In the ICU implementation of UAX#29, \p{Line_Break = Complex_Context}
// character sequences (from South East Asian scripts like Thai, Myanmar, Khmer,
// Lao, etc.) are kept together. This grammar does the same below.
//
// See also the Unicode Line Breaking Algorithm:
//
// http://www.unicode.org/reports/tr14/#SA
//
{ComplexContext}+ { return SOUTH_EAST_ASIAN_TYPE; }
// UAX#29 WB14. Any ÷ Any
//
{Han} { return IDEOGRAPHIC_TYPE; }
{Hiragana} { return HIRAGANA_TYPE; }
// UAX#29 WB3. CR × LF
// WB3a. (Newline | CR | LF) ÷
// WB3b. ÷ (Newline | CR | LF)
// WB14. Any ÷ Any
//
[^] { /* Break so we don't hit fall-through warning: */ break; /* Not numeric, word, ideographic, hiragana, or SE Asian -- ignore it. */ }