pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / analyzers / common / src / java / org / apache / lucene / analysis / hi / HindiNormalizer.java

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/hi/HindiNormalizer.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/hi/HindiNormalizer.java
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+package org.apache.lucene.analysis.hi;
+
+/**
+ * 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 static org.apache.lucene.analysis.util.StemmerUtil.*;
+
+/**
+ * Normalizer for Hindi.
+ * <p>
+ * Normalizes text to remove some differences in spelling variations.
+ * <p>
+ * Implements the Hindi-language specific algorithm specified in:
+ * <i>Word normalization in Indian languages</i>
+ * Prasad Pingali and Vasudeva Varma.
+ * http://web2py.iiit.ac.in/publications/default/download/inproceedings.pdf.3fe5b38c-02ee-41ce-9a8f-3e745670be32.pdf
+ * <p>
+ * with the following additions from <i>Hindi CLIR in Thirty Days</i>
+ * Leah S. Larkey, Margaret E. Connell, and Nasreen AbdulJaleel.
+ * http://maroo.cs.umass.edu/pub/web/getpdf.php?id=454:
+ * <ul>
+ *  <li>Internal Zero-width joiner and Zero-width non-joiners are removed
+ *  <li>In addition to chandrabindu, NA+halant is normalized to anusvara
+ * </ul>
+ * 
+ */
+public class HindiNormalizer {
+  /**
+   * Normalize an input buffer of Hindi text
+   * 
+   * @param s input buffer
+   * @param len length of input buffer
+   * @return length of input buffer after normalization
+   */
+  public int normalize(char s[], int len) {
+
+    for (int i = 0; i < len; i++) {
+      switch (s[i]) {
+        // dead n -> bindu
+      case '\u0928':
+        if (i + 1 < len && s[i + 1] == '\u094D') {
+          s[i] = '\u0902';
+          len = delete(s, i + 1, len);
+        }
+        break;
+      // candrabindu -> bindu
+      case '\u0901':
+        s[i] = '\u0902';
+        break;
+      // nukta deletions
+      case '\u093C':
+        len = delete(s, i, len);
+        i--;
+        break;      
+      case '\u0929':
+        s[i] = '\u0928';
+        break;
+      case '\u0931':
+        s[i] = '\u0930';
+        break;
+      case '\u0934':
+        s[i] = '\u0933';
+        break;
+      case '\u0958':
+        s[i] = '\u0915';
+        break;
+      case '\u0959':
+        s[i] = '\u0916';
+        break;
+      case '\u095A':
+        s[i] = '\u0917';
+        break;
+      case '\u095B':
+        s[i] = '\u091C';
+        break;
+      case '\u095C':
+        s[i] = '\u0921';
+        break;
+      case '\u095D':
+        s[i] = '\u0922';
+        break;
+      case '\u095E':
+        s[i] = '\u092B';
+        break;
+      case '\u095F':
+        s[i] = '\u092F';
+        break;
+        // zwj/zwnj -> delete
+      case '\u200D':
+      case '\u200C':
+        len = delete(s, i, len);
+        i--;
+        break;
+        // virama -> delete
+      case '\u094D':
+        len = delete(s, i, len);
+        i--;
+        break;
+        // chandra/short -> replace
+      case '\u0945':
+      case '\u0946':
+        s[i] = '\u0947';
+        break;
+      case '\u0949':
+      case '\u094A':
+        s[i] = '\u094B';
+        break;
+      case '\u090D':
+      case '\u090E':
+        s[i] = '\u090F';
+        break;
+      case '\u0911':
+      case '\u0912':
+        s[i] = '\u0913';
+        break;
+      case '\u0972':
+        s[i] = '\u0905';
+        break;
+        // long -> short ind. vowels
+      case '\u0906':
+        s[i] = '\u0905';
+        break;
+      case '\u0908':
+        s[i] = '\u0907';
+        break;
+      case '\u090A':
+        s[i] = '\u0909';
+        break;
+      case '\u0960':
+        s[i] = '\u090B';
+        break;
+      case '\u0961':
+        s[i] = '\u090C';
+        break;
+      case '\u0910':
+        s[i] = '\u090F';
+        break;
+      case '\u0914':
+        s[i] = '\u0913';
+        break;
+        // long -> short dep. vowels
+      case '\u0940':
+        s[i] = '\u093F';
+        break;
+      case '\u0942':
+        s[i] = '\u0941';
+        break;
+      case '\u0944':
+        s[i] = '\u0943';
+        break;
+      case '\u0963':
+        s[i] = '\u0962';
+        break;
+      case '\u0948':
+        s[i] = '\u0947';
+        break;
+      case '\u094C':
+        s[i] = '\u094B';
+        break;
+      default:
+        break;
+      }
+    }
+
+    return len;
+  }
+}