SLCORE-819 Add underscore char to the split pattern for better bindin…

…g suggestion

backend/core/src/main/java/org/sonarsource/sonarlint/core/BindingCandidatesFinder.java

@@ -40,6 +40,7 @@
 public class BindingCandidatesFinder {
 
   private static final SonarLintLogger LOG = SonarLintLogger.get();
+  private static final String SPLIT_PATTERN = "[\\W_]+";
   private final ConfigurationRepository configRepository;
   private final BindingClueProvider bindingClueProvider;
   private final SonarProjectsCache sonarProjectsCache;
@@ -106,7 +107,7 @@ private boolean isConfigScopeNameCloseEnoughToSonarProject(String configScopeNam
       LOG.debug("Unable to find SonarProject with key '{}' on connection '{}' in the cache", projectKey, connectionId);
       return false;
     }
-    TextSearchIndex<ServerProject> index = new TextSearchIndex<>();
+    TextSearchIndex<ServerProject> index = new TextSearchIndex<>(SPLIT_PATTERN);
     var p = sonarProjectOpt.get();
     index.index(p, p.getKey() + " " + p.getName());
     var searchResult = index.search(configScopeName);

backend/core/src/main/java/org/sonarsource/sonarlint/core/TextSearchIndex.java

@@ -45,11 +45,17 @@
  * Performance of search: O(log N) on the number of indexed terms + O(N) on the number of results
  */
 public class TextSearchIndex<T> {
-  private static final String SPLIT_PATTERN = "\\W";
+  private static final String DEFAULT_SPLIT_PATTERN = "\\W";
+  private final String splitPattern;
   private TreeMap<String, List<DictEntry>> termToObj;
   private Map<T, Integer> objToWordFrequency;
 
   public TextSearchIndex() {
+    this(DEFAULT_SPLIT_PATTERN);
+  }
+
+  public TextSearchIndex(String splitPattern) {
+    this.splitPattern = splitPattern;
     clear();
   }
 
@@ -180,8 +186,8 @@ private void addToDictionary(String token, int tokenIndex, T obj) {
     entries.add(new DictEntry(obj, tokenIndex));
   }
 
-  private static List<String> tokenize(String text) {
-    var split = text.split(SPLIT_PATTERN);
+  private List<String> tokenize(String text) {
+    var split = text.split(splitPattern);
     List<String> terms = new ArrayList<>(split.length);
 
     for (String s : split) {

backend/core/src/test/java/org/sonarsource/sonarlint/core/TextSearchIndexTest.java

@@ -0,0 +1,34 @@
+/*
+ * SonarLint Core - Implementation
+ * Copyright (C) 2016-2024 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonarsource.sonarlint.core;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TextSearchIndexTest {
+  @Test
+  void splits_strings_based_on_provided_split_pattern() {
+    TextSearchIndex<String> index = new TextSearchIndex<>("[\\W_]+");
+    index.index("text", "a-b-c_d");
+    var searchResult = index.search("d");
+    assertThat(searchResult).isNotEmpty();
+  }
+}