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| <h1 id="Lucene_Net_Analysis_Ar" data-uid="Lucene.Net.Analysis.Ar" class="text-break">Namespace Lucene.Net.Analysis.Ar |
| </h1> |
| <div class="markdown level0 summary"><!-- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
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| <p>Analyzer for Arabic.</p> |
| </div> |
| <div class="markdown level0 conceptual"></div> |
| <div class="markdown level0 remarks"></div> |
| <h3 id="classes">Classes |
| </h3> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicAnalyzer.html">ArabicAnalyzer</a></h4> |
| <section><p><span class="xref">Lucene.Net.Analysis.Analyzer</span> for Arabic. |
| <p> |
| This analyzer implements light-stemming as specified by: |
| <code>Light Stemming for Arabic Information Retrieval</code><br><a href="http://www.mtholyoke.edu/~lballest/Pubs/arab_stem05.pdf">http://www.mtholyoke.edu/~lballest/Pubs/arab_stem05.pdf</a> |
| <p> |
| The analysis package contains three primary components: |
| <ul><li><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicNormalizationFilter.html">ArabicNormalizationFilter</a>: Arabic orthographic normalization.</li><li><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicStemFilter.html">ArabicStemFilter</a>: Arabic light stemming</li><li>Arabic stop words file: a set of default Arabic stop words.</li></ul></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicLetterTokenizer.html">ArabicLetterTokenizer</a></h4> |
| <section><p>Tokenizer that breaks text into runs of letters and diacritics. |
| <p> |
| The problem with the standard Letter tokenizer is that it fails on diacritics. |
| Handling similar to this is necessary for Indic Scripts, Hebrew, Thaana, etc. |
| </p> |
| <p> |
| You must specify the required <span class="xref">Lucene.Net.Util.LuceneVersion</span> compatibility when creating |
| <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicLetterTokenizer.html">ArabicLetterTokenizer</a>: |
| <ul><li>As of 3.1, <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html">CharTokenizer</a> uses an int based API to normalize and |
| detect token characters. See <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicLetterTokenizer.html#Lucene_Net_Analysis_Ar_ArabicLetterTokenizer_IsTokenChar_System_Int32_">IsTokenChar(Int32)</a> and |
| <a class="xref" href="Lucene.Net.Analysis.Util.CharTokenizer.html#Lucene_Net_Analysis_Util_CharTokenizer_Normalize_System_Int32_">Normalize(Int32)</a> for details.</li></ul> |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicLetterTokenizerFactory.html">ArabicLetterTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicLetterTokenizer.html">ArabicLetterTokenizer</a> </p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicNormalizationFilter.html">ArabicNormalizationFilter</a></h4> |
| <section><p>A <span class="xref">Lucene.Net.Analysis.TokenFilter</span> that applies <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicNormalizer.html">ArabicNormalizer</a> to normalize the orthography.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicNormalizationFilterFactory.html">ArabicNormalizationFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicNormalizationFilter.html">ArabicNormalizationFilter</a>.</p> |
| <pre><code><fieldType name="text_arnormal" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.StandardTokenizerFactory"/> |
| <filter class="solr.ArabicNormalizationFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicNormalizer.html">ArabicNormalizer</a></h4> |
| <section><p>Normalizer for Arabic. |
| <p> |
| Normalization is done in-place for efficiency, operating on a termbuffer. |
| <p> |
| Normalization is defined as: |
| <ul><li> Normalization of hamza with alef seat to a bare alef.</li><li> Normalization of teh marbuta to heh</li><li> Normalization of dotless yeh (alef maksura) to yeh.</li><li> Removal of Arabic diacritics (the harakat)</li><li> Removal of tatweel (stretching character).</li></ul></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicStemFilter.html">ArabicStemFilter</a></h4> |
| <section><p>A <span class="xref">Lucene.Net.Analysis.TokenFilter</span> that applies <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicStemmer.html">ArabicStemmer</a> to stem Arabic words.. |
| <p> |
| To prevent terms from being stemmed use an instance of |
| <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.SetKeywordMarkerFilter.html">SetKeywordMarkerFilter</a> or a custom <span class="xref">Lucene.Net.Analysis.TokenFilter</span> that sets |
| the <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.TokenAttributes.KeywordAttribute.html">KeywordAttribute</a> before this <span class="xref">Lucene.Net.Analysis.TokenStream</span>.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicStemFilterFactory.html">ArabicStemFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Ar.ArabicStemFilter.html">ArabicStemFilter</a>.</p> |
| <pre><code><fieldType name="text_arstem" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.StandardTokenizerFactory"/> |
| <filter class="solr.ArabicNormalizationFilterFactory"/> |
| <filter class="solr.ArabicStemFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Ar.ArabicStemmer.html">ArabicStemmer</a></h4> |
| <section><p>Stemmer for Arabic. |
| <p> |
| Stemming is done in-place for efficiency, operating on a termbuffer. |
| <p> |
| Stemming is defined as: |
| <ul><li> Removal of attached definite article, conjunction, and prepositions.</li><li> Stemming of common suffixes.</li></ul></p> |
| </section> |
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