## org.apache.lucene.analysis.icu.segmentation
Class LaoBreakIterator

    java.lang.Object
      com.ibm.icu.text.BreakIterator
          org.apache.lucene.analysis.icu.segmentation.LaoBreakIterator

All Implemented Interfaces:
  Cloneable

    public class LaoBreakIterator

extends com.ibm.icu.text.BreakIterator

Syllable iterator for Lao text.

This breaks Lao text into syllables according to: Syllabification of Lao Script for Line Breaking Phonpasit Phissamay, Valaxay Dalolay, Chitaphone Chanhsililath, Oulaiphone Silimasak, Sarmad Hussain, Nadir Durrani, Science Technology and Environment Agency, CRULP.

- http://www.panl10n.net/english/final%20reports/pdf%20files/Laos/LAO06.pdf
- http://www.panl10n.net/Presentations/Cambodia/Phonpassit/LineBreakingAlgo.pdf

Most work is accomplished with RBBI rules, however some additional special logic is needed that cannot be coded in a grammar, and this is implemented here.

For example, what appears to be a final consonant might instead be part of the next syllable. Rules match in a greedy fashion, leaving an illegal sequence that matches no rules.

Take for instance the text ກວ່າດອກ The first rule greedily matches ກວ່າດ, but then ອກ is encountered, which is illegal. What LaoBreakIterator does, according to the paper:

1. backtrack and remove the ດ from the last syllable, placing it on the current syllable.
2. verify the modified previous syllable (ກວ່າ ) is still legal.
3. verify the modified current syllable (ດອກ) is now legal.
4. If 2 or 3 fails, then restore the ດ to the last syllable and skip the current character.

Finally, LaoBreakIterator also takes care of the second concern mentioned in the paper. This is the issue of combining marks being in the wrong order (typos).

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields inherited from class com.ibm.icu.text.BreakIterator
`DONE, KIND_CHARACTER, KIND_LINE, KIND_SENTENCE, KIND_TITLE, KIND_WORD`

Constructor Summary
`LaoBreakIterator(com.ibm.icu.text.RuleBasedBreakIterator rules)` Creates a new iterator, performing the backtracking verification across the provided `rules`.

Method Summary
`LaoBreakIterator` `clone()` Clone method.
`int` `current()`
`int` `first()`
`int` `following(int offset)`
`CharacterIterator` `getText()`
`int` `last()`
`int` `next()`
`int` `next(int n)`
`int` `previous()`
`void` `setText(CharacterIterator text)`
`void` `setText(String newText)`

Methods inherited from class com.ibm.icu.text.BreakIterator

`getAvailableLocales, getAvailableULocales, getBreakInstance, getCharacterInstance, getCharacterInstance, getCharacterInstance, getLineInstance, getLineInstance, getLineInstance, getLocale, getSentenceInstance, getSentenceInstance, getSentenceInstance, getTitleInstance, getTitleInstance, getTitleInstance, getWordInstance, getWordInstance, getWordInstance, isBoundary, preceding, registerInstance, registerInstance, unregister`

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### LaoBreakIterator

    public LaoBreakIterator(com.ibm.icu.text.RuleBasedBreakIterator rules)

  Creates a new iterator, performing the backtracking verification across the provided `rules`.

Method Detail

### current

    public int current()

  Specified by:
    `current` in class `com.ibm.icu.text.BreakIterator`

### first

    public int first()

  Specified by:
    `first` in class `com.ibm.icu.text.BreakIterator`

### following

    public int following(int offset)

  Specified by:
    `following` in class `com.ibm.icu.text.BreakIterator`

### getText

    public CharacterIterator getText()

  Specified by:
    `getText` in class `com.ibm.icu.text.BreakIterator`

### last

    public int last()

  Specified by:
    `last` in class `com.ibm.icu.text.BreakIterator`

### next

    public int next()

  Specified by:
    `next` in class `com.ibm.icu.text.BreakIterator`

### next

    public int next(int n)

  Specified by:
    `next` in class `com.ibm.icu.text.BreakIterator`

### previous

    public int previous()

  Specified by:
    `previous` in class `com.ibm.icu.text.BreakIterator`

### setText

    public void setText(CharacterIterator text)

  Specified by:
    `setText` in class `com.ibm.icu.text.BreakIterator`

### setText

    public void setText(String newText)

  Overrides:
    `setText` in class `com.ibm.icu.text.BreakIterator`

### clone

    public LaoBreakIterator clone()

  Clone method. Creates another LaoBreakIterator with the same behavior and current state as this one.

  Overrides:
    `clone` in class `com.ibm.icu.text.BreakIterator`
  Returns:
    The clone.

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