--- /dev/null
+package org.apache.lucene.analysis.synonym;
+
+/**
+ * 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 java.io.BufferedReader;
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.io.Reader;
+import java.text.ParseException;
+import java.util.ArrayList;
+
+import org.apache.lucene.analysis.Analyzer;
+import org.apache.lucene.util.CharsRef;
+
+/**
+ * Parser for the Solr synonyms format.
+ * <ol>
+ * <li> Blank lines and lines starting with '#' are comments.
+ * <li> Explicit mappings match any token sequence on the LHS of "=>"
+ * and replace with all alternatives on the RHS. These types of mappings
+ * ignore the expand parameter in the constructor.
+ * Example:
+ * <blockquote>i-pod, i pod => ipod</blockquote>
+ * <li> Equivalent synonyms may be separated with commas and give
+ * no explicit mapping. In this case the mapping behavior will
+ * be taken from the expand parameter in the constructor. This allows
+ * the same synonym file to be used in different synonym handling strategies.
+ * Example:
+ * <blockquote>ipod, i-pod, i pod</blockquote>
+ *
+ * <li> Multiple synonym mapping entries are merged.
+ * Example:
+ * <blockquote>
+ * foo => foo bar<br>
+ * foo => baz<br><br>
+ * is equivalent to<br><br>
+ * foo => foo bar, baz
+ * </blockquote>
+ * </ol>
+ * @lucene.experimental
+ */
+public class SolrSynonymParser extends SynonymMap.Builder {
+ private final boolean expand;
+ private final Analyzer analyzer;
+
+ public SolrSynonymParser(boolean dedup, boolean expand, Analyzer analyzer) {
+ super(dedup);
+ this.expand = expand;
+ this.analyzer = analyzer;
+ }
+
+ public void add(Reader in) throws IOException, ParseException {
+ LineNumberReader br = new LineNumberReader(in);
+ try {
+ addInternal(br);
+ } catch (IllegalArgumentException e) {
+ ParseException ex = new ParseException("Invalid synonym rule at line " + br.getLineNumber(), 0);
+ ex.initCause(e);
+ throw ex;
+ } finally {
+ br.close();
+ }
+ }
+
+ private void addInternal(BufferedReader in) throws IOException {
+ String line = null;
+ while ((line = in.readLine()) != null) {
+ if (line.length() == 0 || line.charAt(0) == '#') {
+ continue; // ignore empty lines and comments
+ }
+
+ CharsRef inputs[];
+ CharsRef outputs[];
+
+ // TODO: we could process this more efficiently.
+ String sides[] = split(line, "=>");
+ if (sides.length > 1) { // explicit mapping
+ if (sides.length != 2) {
+ throw new IllegalArgumentException("more than one explicit mapping specified on the same line");
+ }
+ String inputStrings[] = split(sides[0], ",");
+ inputs = new CharsRef[inputStrings.length];
+ for (int i = 0; i < inputs.length; i++) {
+ inputs[i] = analyze(analyzer, unescape(inputStrings[i]).trim(), new CharsRef());
+ }
+
+ String outputStrings[] = split(sides[1], ",");
+ outputs = new CharsRef[outputStrings.length];
+ for (int i = 0; i < outputs.length; i++) {
+ outputs[i] = analyze(analyzer, unescape(outputStrings[i]).trim(), new CharsRef());
+ }
+ } else {
+ String inputStrings[] = split(line, ",");
+ inputs = new CharsRef[inputStrings.length];
+ for (int i = 0; i < inputs.length; i++) {
+ inputs[i] = analyze(analyzer, unescape(inputStrings[i]).trim(), new CharsRef());
+ }
+ if (expand) {
+ outputs = inputs;
+ } else {
+ outputs = new CharsRef[1];
+ outputs[0] = inputs[0];
+ }
+ }
+
+ // currently we include the term itself in the map,
+ // and use includeOrig = false always.
+ // this is how the existing filter does it, but its actually a bug,
+ // especially if combined with ignoreCase = true
+ for (int i = 0; i < inputs.length; i++) {
+ for (int j = 0; j < outputs.length; j++) {
+ add(inputs[i], outputs[j], false);
+ }
+ }
+ }
+ }
+
+ private static String[] split(String s, String separator) {
+ ArrayList<String> list = new ArrayList<String>(2);
+ StringBuilder sb = new StringBuilder();
+ int pos=0, end=s.length();
+ while (pos < end) {
+ if (s.startsWith(separator,pos)) {
+ if (sb.length() > 0) {
+ list.add(sb.toString());
+ sb=new StringBuilder();
+ }
+ pos+=separator.length();
+ continue;
+ }
+
+ char ch = s.charAt(pos++);
+ if (ch=='\\') {
+ sb.append(ch);
+ if (pos>=end) break; // ERROR, or let it go?
+ ch = s.charAt(pos++);
+ }
+
+ sb.append(ch);
+ }
+
+ if (sb.length() > 0) {
+ list.add(sb.toString());
+ }
+
+ return list.toArray(new String[list.size()]);
+ }
+
+ private String unescape(String s) {
+ if (s.indexOf("\\") >= 0) {
+ StringBuilder sb = new StringBuilder();
+ for (int i = 0; i < s.length(); i++) {
+ char ch = s.charAt(i);
+ if (ch == '\\' && i < s.length() - 1) {
+ sb.append(s.charAt(++i));
+ } else {
+ sb.append(ch);
+ }
+ }
+ return sb.toString();
+ }
+ return s;
+ }
+}
fnp / pylucene.git / blobdiff