SOLR-4565: Extend Norwegian stemmers to handle nynorsk

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1497396 13f79535-47bb-0310-9956-ffa450edef68

lucene/CHANGES.txt

@@ -257,6 +257,9 @@ New Features
 * LUCENE-5079: IndexWriter.hasUncommittedChanges() returns true if there are
   changes that have not been committed. (yonik, Mike McCandless, Uwe Schindler)
 
+* SOLR-4565: Extend NorwegianLightStemFilter and NorwegianMinimalStemFilter 
+  to handle "nynorsk" (Erlend Garåsen, janhoy via Robert Muir)
+
 API Changes
 
 * LUCENE-5077: Make it easier to use compressed norms. Lucene42NormsFormat takes

lucene/analysis/common/src/java/org/apache/lucene/analysis/no/NorwegianLightStemFilter.java

@@ -35,12 +35,26 @@ import org.apache.lucene.analysis.tokenattributes.KeywordAttribute;
  * </p>
  */
 public final class NorwegianLightStemFilter extends TokenFilter {
-  private final NorwegianLightStemmer stemmer = new NorwegianLightStemmer();
+  private final NorwegianLightStemmer stemmer;
   private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
   private final KeywordAttribute keywordAttr = addAttribute(KeywordAttribute.class);
   
+  /** 
+   * Calls {@link #NorwegianLightStemFilter(TokenStream, int) 
+   * NorwegianLightStemFilter(input, BOKMAAL)}
+   */
   public NorwegianLightStemFilter(TokenStream input) {
+    this(input, NorwegianLightStemmer.BOKMAAL);
+  }
+  
+  /** 
+   * Creates a new NorwegianLightStemFilter
+   * @param flags set to {@link NorwegianLightStemmer#BOKMAAL}, 
+   *                     {@link NorwegianLightStemmer#NYNORSK}, or both.
+   */
+  public NorwegianLightStemFilter(TokenStream input, int flags) {
     super(input);
+    stemmer = new NorwegianLightStemmer(flags);
   }
   
   @Override

lucene/analysis/common/src/java/org/apache/lucene/analysis/no/NorwegianLightStemFilterFactory.java

@@ -23,6 +23,9 @@ import org.apache.lucene.analysis.TokenStream;
 import org.apache.lucene.analysis.no.NorwegianLightStemFilter;
 import org.apache.lucene.analysis.util.TokenFilterFactory;
 
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.BOKMAAL;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.NYNORSK;
+
 /** 
  * Factory for {@link NorwegianLightStemFilter}.
  * <pre class="prettyprint">
@@ -30,15 +33,27 @@ import org.apache.lucene.analysis.util.TokenFilterFactory;
  *   &lt;analyzer&gt;
  *     &lt;tokenizer class="solr.StandardTokenizerFactory"/&gt;
  *     &lt;filter class="solr.LowerCaseFilterFactory"/&gt;
- *     &lt;filter class="solr.NorwegianLightStemFilterFactory"/&gt;
+ *     &lt;filter class="solr.NorwegianLightStemFilterFactory" variant="nb"/&gt;
  *   &lt;/analyzer&gt;
  * &lt;/fieldType&gt;</pre>
  */
 public class NorwegianLightStemFilterFactory extends TokenFilterFactory {
   
+  private final int flags;
+  
   /** Creates a new NorwegianLightStemFilterFactory */
   public NorwegianLightStemFilterFactory(Map<String,String> args) {
     super(args);
+    String variant = get(args, "variant");
+    if (variant == null || "nb".equals(variant)) {
+      flags = BOKMAAL;
+    } else if ("nn".equals(variant)) {
+      flags = NYNORSK;
+    } else if ("no".equals(variant)) {
+      flags = BOKMAAL | NYNORSK;
+    } else {
+      throw new IllegalArgumentException("invalid variant: " + variant);
+    }
     if (!args.isEmpty()) {
       throw new IllegalArgumentException("Unknown parameters: " + args);
     }
@@ -46,6 +61,6 @@ public class NorwegianLightStemFilterFactory extends TokenFilterFactory {
   
   @Override
   public TokenStream create(TokenStream input) {
-    return new NorwegianLightStemFilter(input);
+    return new NorwegianLightStemFilter(input, flags);
   }
 }

lucene/analysis/common/src/java/org/apache/lucene/analysis/no/NorwegianLightStemmer.java

@@ -62,6 +62,25 @@ import static org.apache.lucene.analysis.util.StemmerUtil.*;
  * corpus to validate against whereas the Norwegian one is hand crafted.
  */
 public class NorwegianLightStemmer {
+  /** Constant to remove Bokmål-specific endings */
+  public static final int BOKMAAL = 1;
+  /** Constant to remove Nynorsk-specific endings */
+  public static final int NYNORSK = 2;
+  
+  final boolean useBokmaal;
+  final boolean useNynorsk;
+  
+  /** 
+   * Creates a new NorwegianLightStemmer
+   * @param flags set to {@link #BOKMAAL}, {@link #NYNORSK}, or both.
+   */
+  public NorwegianLightStemmer(int flags) {
+    if (flags <= 0 || flags > BOKMAAL + NYNORSK) {
+      throw new IllegalArgumentException("invalid flags");
+    }
+    useBokmaal = (flags & BOKMAAL) != 0;
+    useNynorsk = (flags & NYNORSK) != 0;
+  }
       
   public int stem(char s[], int len) {   
     // Remove posessive -s (bilens -> bilen) and continue checking 
@@ -70,39 +89,76 @@ public class NorwegianLightStemmer {
 
     // Remove common endings, single-pass
     if (len > 7 &&
-        (endsWith(s, len, "heter") ||  // general ending (hemmelig-heter -> hemmelig)
-         endsWith(s, len, "heten")))   // general ending (hemmelig-heten -> hemmelig)
+        ((endsWith(s, len, "heter") &&
+          useBokmaal) ||  // general ending (hemmelig-heter -> hemmelig)
+         (endsWith(s, len, "heten") &&
+          useBokmaal) ||  // general ending (hemmelig-heten -> hemmelig)
+         (endsWith(s, len, "heita") &&
+          useNynorsk)))   // general ending (hemmeleg-heita -> hemmeleg)
       return len - 5;
     
+    // Remove Nynorsk common endings, single-pass
+    if (len > 8 && useNynorsk &&
+        (endsWith(s, len, "heiter") ||  // general ending (hemmeleg-heiter -> hemmeleg)
+         endsWith(s, len, "leiken") ||  // general ending (trygg-leiken -> trygg)
+         endsWith(s, len, "leikar")))   // general ending (trygg-leikar -> trygg)
+      return len - 6;
+
     if (len > 5 &&
-        (endsWith(s, len, "dom") || // general ending (kristen-dom -> kristen)
-         endsWith(s, len, "het")))  // general ending (hemmelig-het -> hemmelig)
+        (endsWith(s, len, "dom") ||  // general ending (kristen-dom -> kristen)
+         (endsWith(s, len, "het") &&
+          useBokmaal)))              // general ending (hemmelig-het -> hemmelig)
       return len - 3;
     
+    if (len > 6 && useNynorsk &&
+        (endsWith(s, len, "heit") ||  // general ending (hemmeleg-heit -> hemmeleg)
+         endsWith(s, len, "semd") ||  // general ending (verk-semd -> verk)
+         endsWith(s, len, "leik")))   // general ending (trygg-leik -> trygg)
+      return len - 4;
+    
     if (len > 7 && 
         (endsWith(s, len, "elser") ||   // general ending (føl-elser -> føl)
          endsWith(s, len, "elsen")))    // general ending (føl-elsen -> føl)
       return len - 5;
     
     if (len > 6 &&
-        (endsWith(s, len, "ende") ||  // (sov-ende -> sov)
+        ((endsWith(s, len, "ende") &&
+          useBokmaal) ||      // (sov-ende -> sov)
+         (endsWith(s, len, "ande") &&
+          useNynorsk) ||      // (sov-ande -> sov)
          endsWith(s, len, "else") ||  // general ending (føl-else -> føl)
-         endsWith(s, len, "este") ||  // adj (fin-este -> fin)
-         endsWith(s, len, "eren")))   // masc
+         (endsWith(s, len, "este") &&
+          useBokmaal) ||      // adj (fin-este -> fin)
+         (endsWith(s, len, "aste") &&
+          useNynorsk) ||      // adj (fin-aste -> fin)
+         (endsWith(s, len, "eren") &&
+          useBokmaal) ||      // masc
+         (endsWith(s, len, "aren") &&
+          useNynorsk)))       // masc 
       return len - 4;
     
     if (len > 5 &&
-        (endsWith(s, len, "ere") || // adj (fin-ere -> fin)
-         endsWith(s, len, "est") || // adj (fin-est -> fin)
-         endsWith(s, len, "ene")    // masc/fem/neutr pl definite (hus-ene)
-         )) 
+        ((endsWith(s, len, "ere") &&
+         useBokmaal) ||     // adj (fin-ere -> fin)
+         (endsWith(s, len, "are") &&
+          useNynorsk) ||    // adj (fin-are -> fin)
+         (endsWith(s, len, "est") &&
+          useBokmaal) ||    // adj (fin-est -> fin)
+         (endsWith(s, len, "ast") &&
+          useNynorsk) ||    // adj (fin-ast -> fin)
+         endsWith(s, len, "ene") || // masc/fem/neutr pl definite (hus-ene)
+         (endsWith(s, len, "ane") &&
+          useNynorsk)))     // masc pl definite (gut-ane)
       return len - 3;
     
     if (len > 4 &&
         (endsWith(s, len, "er") ||  // masc/fem indefinite
          endsWith(s, len, "en") ||  // masc/fem definite
          endsWith(s, len, "et") ||  // neutr definite
-         endsWith(s, len, "st") ||  // adj (billig-st -> billig)
+         (endsWith(s, len, "ar") &&
+          useNynorsk) ||    // masc pl indefinite
+         (endsWith(s, len, "st") &&
+          useBokmaal) ||    // adj (billig-st -> billig)
          endsWith(s, len, "te")))
       return len - 2;
 

lucene/analysis/common/src/java/org/apache/lucene/analysis/no/NorwegianMinimalStemFilter.java

@@ -35,12 +35,26 @@ import org.apache.lucene.analysis.tokenattributes.KeywordAttribute;
  * </p>
  */
 public final class NorwegianMinimalStemFilter extends TokenFilter {
-  private final NorwegianMinimalStemmer stemmer = new NorwegianMinimalStemmer();
+  private final NorwegianMinimalStemmer stemmer;
   private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
   private final KeywordAttribute keywordAttr = addAttribute(KeywordAttribute.class);
 
+  /** 
+   * Calls {@link #NorwegianMinimalStemFilter(TokenStream, int) 
+   * NorwegianMinimalStemFilter(input, BOKMAAL)}
+   */
   public NorwegianMinimalStemFilter(TokenStream input) {
+    this(input, NorwegianLightStemmer.BOKMAAL);
+  }
+  
+  /** 
+   * Creates a new NorwegianLightStemFilter
+   * @param flags set to {@link NorwegianLightStemmer#BOKMAAL}, 
+   *                     {@link NorwegianLightStemmer#NYNORSK}, or both.
+   */
+  public NorwegianMinimalStemFilter(TokenStream input, int flags) {
     super(input);
+    this.stemmer = new NorwegianMinimalStemmer(flags);
   }
   
   @Override

lucene/analysis/common/src/java/org/apache/lucene/analysis/no/NorwegianMinimalStemFilterFactory.java

@@ -23,6 +23,9 @@ import org.apache.lucene.analysis.TokenStream;
 import org.apache.lucene.analysis.no.NorwegianMinimalStemFilter;
 import org.apache.lucene.analysis.util.TokenFilterFactory;
 
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.BOKMAAL;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.NYNORSK;
+
 /** 
  * Factory for {@link NorwegianMinimalStemFilter}.
  * <pre class="prettyprint">
@@ -30,15 +33,27 @@ import org.apache.lucene.analysis.util.TokenFilterFactory;
  *   &lt;analyzer&gt;
  *     &lt;tokenizer class="solr.StandardTokenizerFactory"/&gt;
  *     &lt;filter class="solr.LowerCaseFilterFactory"/&gt;
- *     &lt;filter class="solr.NorwegianMinimalStemFilterFactory"/&gt;
+ *     &lt;filter class="solr.NorwegianMinimalStemFilterFactory" variant="nb"/&gt;
  *   &lt;/analyzer&gt;
  * &lt;/fieldType&gt;</pre>
  */
 public class NorwegianMinimalStemFilterFactory extends TokenFilterFactory {
   
+  private final int flags;
+  
   /** Creates a new NorwegianMinimalStemFilterFactory */
   public NorwegianMinimalStemFilterFactory(Map<String,String> args) {
     super(args);
+    String variant = get(args, "variant");
+    if (variant == null || "nb".equals(variant)) {
+      flags = BOKMAAL;
+    } else if ("nn".equals(variant)) {
+      flags = NYNORSK;
+    } else if ("no".equals(variant)) {
+      flags = BOKMAAL | NYNORSK;
+    } else {
+      throw new IllegalArgumentException("invalid variant: " + variant);
+    }
     if (!args.isEmpty()) {
       throw new IllegalArgumentException("Unknown parameters: " + args);
     }
@@ -46,6 +61,6 @@ public class NorwegianMinimalStemFilterFactory extends TokenFilterFactory {
   
   @Override
   public TokenStream create(TokenStream input) {
-    return new NorwegianMinimalStemFilter(input);
+    return new NorwegianMinimalStemFilter(input, flags);
   }
 }

lucene/analysis/common/src/java/org/apache/lucene/analysis/no/NorwegianMinimalStemmer.java

@@ -53,13 +53,30 @@ package org.apache.lucene.analysis.no;
  */
 
 import static org.apache.lucene.analysis.util.StemmerUtil.*;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.BOKMAAL;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.NYNORSK;
 
 /**
- * Minimal Stemmer for Norwegian bokmål (no-nb)
+ * Minimal Stemmer for Norwegian Bokmål (no-nb) and Nynorsk (no-nn)
  * <p>
  * Stems known plural forms for Norwegian nouns only, together with genitiv -s
  */
 public class NorwegianMinimalStemmer {
+  final boolean useBokmaal;
+  final boolean useNynorsk;
+  
+  /** 
+   * Creates a new NorwegianMinimalStemmer
+   * @param flags set to {@link NorwegianLightStemmer#BOKMAAL}, 
+   *                     {@link NorwegianLightStemmer#NYNORSK}, or both.
+   */
+  public NorwegianMinimalStemmer(int flags) {
+    if (flags <= 0 || flags > BOKMAAL + NYNORSK) {
+      throw new IllegalArgumentException("invalid flags");
+    }
+    useBokmaal = (flags & BOKMAAL) != 0;
+    useNynorsk = (flags & NYNORSK) != 0;
+  }
 
   public int stem(char s[], int len) { 
     // Remove genitiv s
@@ -67,15 +84,19 @@ public class NorwegianMinimalStemmer {
       len--;
     
     if (len > 5 &&
-         endsWith(s, len, "ene")    // masc/fem/neutr pl definite (hus-ene)
-        )
+         (endsWith(s, len, "ene") ||  // masc/fem/neutr pl definite (hus-ene)
+          (endsWith(s, len, "ane") &&
+           useNynorsk                 // masc pl definite (gut-ane)
+        )))
       return len - 3;
 
     if (len > 4 &&
-        (endsWith(s, len, "er") ||  // masc/fem indefinite
-         endsWith(s, len, "en") ||  // masc/fem definite
-         endsWith(s, len, "et")     // neutr definite
-        ))
+        (endsWith(s, len, "er") ||   // masc/fem indefinite
+         endsWith(s, len, "en") ||   // masc/fem definite
+         endsWith(s, len, "et") ||   // neutr definite
+         (endsWith(s, len, "ar") &&
+          useNynorsk                 // masc pl indefinite
+        )))
       return len - 2;
 
     if (len > 3)

lucene/analysis/common/src/test/org/apache/lucene/analysis/no/TestNorwegianLightStemFilter.java

@@ -32,6 +32,9 @@ import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;
 import org.apache.lucene.analysis.util.CharArraySet;
 
 import static org.apache.lucene.analysis.VocabularyAssert.*;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.BOKMAAL;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.NYNORSK;
+
 
 /**
  * Simple tests for {@link NorwegianLightStemFilter}
@@ -42,7 +45,7 @@ public class TestNorwegianLightStemFilter extends BaseTokenStreamTestCase {
     protected TokenStreamComponents createComponents(String fieldName,
         Reader reader) {
       Tokenizer source = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
-      return new TokenStreamComponents(source, new NorwegianLightStemFilter(source));
+      return new TokenStreamComponents(source, new NorwegianLightStemFilter(source, BOKMAAL));
     }
   };
   
@@ -51,6 +54,18 @@ public class TestNorwegianLightStemFilter extends BaseTokenStreamTestCase {
     assertVocabulary(analyzer, new FileInputStream(getDataFile("nb_light.txt")));
   }
   
+  /** Test against a Nynorsk vocabulary file */
+  public void testNynorskVocabulary() throws IOException {  
+    Analyzer analyzer = new Analyzer() {
+      @Override
+      protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
+        Tokenizer source = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+        return new TokenStreamComponents(source, new NorwegianLightStemFilter(source, NYNORSK));
+      }
+    };
+    assertVocabulary(analyzer, new FileInputStream(getDataFile("nn_light.txt")));
+  }
+  
   public void testKeyword() throws IOException {
     final CharArraySet exclusionSet = new CharArraySet(TEST_VERSION_CURRENT, asSet("sekretæren"), false);
     Analyzer a = new Analyzer() {

lucene/analysis/common/src/test/org/apache/lucene/analysis/no/TestNorwegianLightStemFilterFactory.java

@@ -35,6 +35,22 @@ public class TestNorwegianLightStemFilterFactory extends BaseTokenStreamFactoryT
     assertTokenStreamContents(stream, new String[] { "epl", "epl" });
   }
 
+  /** Test stemming with variant set explicitly to Bokmål */
+  public void testBokmaalStemming() throws Exception {
+    Reader reader = new StringReader("epler eple");
+    TokenStream stream = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+    stream = tokenFilterFactory("NorwegianLightStem", "variant", "nb").create(stream);
+    assertTokenStreamContents(stream, new String[] { "epl", "epl" });
+  }
+
+  /** Test stemming with variant set explicitly to Nynorsk */
+  public void testNynorskStemming() throws Exception {
+    Reader reader = new StringReader("gutar gutane");
+    TokenStream stream = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+    stream = tokenFilterFactory("NorwegianLightStem", "variant", "nn").create(stream);
+    assertTokenStreamContents(stream, new String[] { "gut", "gut" });
+  }
+
   /** Test that bogus arguments result in exception */
   public void testBogusArguments() throws Exception {
     try {

lucene/analysis/common/src/test/org/apache/lucene/analysis/no/TestNorwegianMinimalStemFilter.java

@@ -32,6 +32,8 @@ import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;
 import org.apache.lucene.analysis.util.CharArraySet;
 
 import static org.apache.lucene.analysis.VocabularyAssert.*;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.BOKMAAL;
+import static org.apache.lucene.analysis.no.NorwegianLightStemmer.NYNORSK;
 
 /**
  * Simple tests for {@link NorwegianMinimalStemFilter}
@@ -42,15 +44,27 @@ public class TestNorwegianMinimalStemFilter extends BaseTokenStreamTestCase {
     protected TokenStreamComponents createComponents(String fieldName,
         Reader reader) {
       Tokenizer source = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
-      return new TokenStreamComponents(source, new NorwegianMinimalStemFilter(source));
+      return new TokenStreamComponents(source, new NorwegianMinimalStemFilter(source, BOKMAAL));
     }
   };
   
-  /** Test against a vocabulary file */
+  /** Test against a Bokmål vocabulary file */
   public void testVocabulary() throws IOException {
     assertVocabulary(analyzer, new FileInputStream(getDataFile("nb_minimal.txt")));
   }
   
+  /** Test against a Nynorsk vocabulary file */
+  public void testNynorskVocabulary() throws IOException {  
+    Analyzer analyzer = new Analyzer() {
+      @Override
+      protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
+        Tokenizer source = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+        return new TokenStreamComponents(source, new NorwegianMinimalStemFilter(source, NYNORSK));
+      }
+    };
+    assertVocabulary(analyzer, new FileInputStream(getDataFile("nn_minimal.txt")));
+  }
+  
   public void testKeyword() throws IOException {
     final CharArraySet exclusionSet = new CharArraySet(TEST_VERSION_CURRENT, asSet("sekretæren"), false);
     Analyzer a = new Analyzer() {

lucene/analysis/common/src/test/org/apache/lucene/analysis/no/TestNorwegianMinimalStemFilterFactory.java

@@ -35,6 +35,22 @@ public class TestNorwegianMinimalStemFilterFactory extends BaseTokenStreamFactor
     assertTokenStreamContents(stream, new String[] { "epl", "epl", "epl", "epl", "epl", "epl" });
   }
   
+  /** Test stemming with variant set explicitly to Bokmål */
+  public void testBokmaalStemming() throws Exception {
+    Reader reader = new StringReader("eple eplet epler eplene eplets eplenes");
+    TokenStream stream = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+    stream = tokenFilterFactory("NorwegianMinimalStem", "variant", "nb").create(stream);
+    assertTokenStreamContents(stream, new String[] { "epl", "epl", "epl", "epl", "epl", "epl" });
+  }
+  
+  /** Test stemming with variant set explicitly to Nynorsk */
+  public void testNynorskStemming() throws Exception {
+    Reader reader = new StringReader("gut guten gutar gutane gutens gutanes");
+    TokenStream stream = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
+    stream = tokenFilterFactory("NorwegianMinimalStem", "variant", "nn").create(stream);
+    assertTokenStreamContents(stream, new String[] { "gut", "gut", "gut", "gut", "gut", "gut" });
+  }
+  
   /** Test that bogus arguments result in exception */
   public void testBogusArguments() throws Exception {
     try {

lucene/analysis/common/src/test/org/apache/lucene/analysis/no/nn_light.txt

@@ -0,0 +1,110 @@
+#
+# Tests for Norwegian Nynorsk light stemmer
+# It should tackle nouns, adjectives, genitive and some general endings
+#
+# Nouns masculine
+gut	gut
+guten	gut
+gutar	gut
+gutane	gut
+gutens	gut
+gutanes	gut
+søknad	søknad
+søknaden	søknad
+søknadar	søknad
+søknadane	søknad
+søknadens	søknad
+søknadanes	søknad
+# Nouns feminine
+kjole	kjol
+kjola	kjol
+kjoler	kjol
+kjolene	kjol
+kjolas	kjol
+# Nouns neutral
+dyr	dyr
+dyret	dyr
+dyra	dyr
+dyras	dyr
+prospekt	prospekt
+prospektet	prospekt
+prospekta	prospekt
+prospektas	prospekt
+innhald	innhald
+innhaldet	innhald
+innhalda	innhald
+# General endings
+hemmeleg	hemmeleg
+hemmelegheit	hemmeleg
+hemmelegheita	hemmeleg
+hemmelegheiter	hemmeleg
+vanskeleg	vanskeleg
+vanskelegheit	vanskeleg
+vanskelegheita	vanskeleg
+vanskelegheiter	vanskeleg
+hevelse	hev
+heva	hev
+hevelsen	hev
+heve	hev
+ærleg	ærleg
+ærlegdom	ærleg
+ærlegdommen	ærlegdomm
+ærlegdommens	ærlegdomm
+alderdom	alder
+alderdommen	alderdomm
+alderdommens	alderdomm
+trygg	trygg
+tryggleik	trygg
+tryggleiken	trygg
+tryggleikens	trygg
+tryggleikar	trygg
+kjærleik	kjær
+kjærleiken	kjær
+kjærleikens	kjær
+kjærleikar	kjær
+verke	verk
+verksemd	verk
+hjelpe	hjelp
+hjelpsemd	hjelp
+# Adjectives
+billeg	billeg
+billegare	billeg
+billegast	billeg
+smal	smal
+smalare	smal
+smalast	smal
+farleg	farleg
+farlegare	farleg
+farlegast	farleg
+#########################################
+# Words that should not be stemmed
+#
+# Irregular masculine nouns (not supposed to be handled correctly)
+søner	søn
+sønene	søn
+brør	brør
+brørne	brørn
+# Irregular feminine nouns, not handled
+dotter	dott
+døtrer	døtr
+døtrene	døtr
+klo	klo
+klørne	klørn
+mor	mor
+mødrer	mødr
+mødrene	mødr
+# Irregular neutral nouns, not handled
+vedunder	vedund
+# Other words that should not be touched
+abc	abc
+123	123
+Jens	Jens
+# Irregular adjectives that should not be stemmed
+gammal	gammal
+eldre	eldr
+eldst	eldst
+# Verbs, should not be stemmed
+syngje	syngj
+syng	syng
+song	song
+sunge	sung

lucene/analysis/common/src/test/org/apache/lucene/analysis/no/nn_minimal.txt

@@ -0,0 +1,76 @@
+#
+# Tests for Norwegian minimal stemmer using Nynorsk as variant
+# It only tries to stem nouns, i.e. being very little aggressive
+#
+# Nouns masculine
+gut	gut
+guten	gut
+gutar	gut
+gutane	gut
+gutens	gut
+gutanes	gut
+søknad	søknad
+søknaden	søknad
+søknadar	søknad
+søknadane	søknad
+søknadens	søknad
+søknadanes	søknad
+# Nouns feminine
+jente	jent
+jenta	jent
+jenter	jent
+jentene	jent
+jentas	jent
+# Nouns neutral
+dyr	dyr
+dyret	dyr
+dyra	dyr
+dyras	dyr
+prospekt	prospekt
+prospektet	prospekt
+prospekta	prospekt
+prospektas	prospekt
+innhald	innhald
+innhaldet	innhald
+innhalda	innhald
+#########################################
+# Words that should not be stemmed
+#
+# Irregular masculine nouns (not supposed to be handled correctly)
+søner	søn
+sønene	søn
+brør	brør
+brørne	brørn
+# Irregular feminine nouns, not handled
+dotter	dott
+døtrer	døtr
+døtrene	døtr
+klo	klo
+klørne	klørn
+mor	mor
+mødrer	mødr
+mødrene	mødr
+# Irregular neutral nouns, not handled
+vedunder	vedund
+# Other words that should not be touched
+abc	abc
+123	123
+Jens	Jens
+# Adjective, should not be stemmed
+farleg	farleg
+farlegare	farlegar
+farlegast	farlegast
+stor	stor
+større	størr
+størst	størst
+gammal	gammal
+eldre	eldr
+eldst	eldst
+# General endings, should not be stemmed
+sanning	sanning
+sanninga	sanning
+# Verbs, should not be stemmed
+syngje	syngj
+syng	syng
+song	song
+sunge	sung