Add support for YANG file extension and analyzer support (#4415)

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/AnalyzerGuru.java

@@ -111,6 +111,7 @@
 import org.opengrok.indexer.analysis.uue.UuencodeAnalyzerFactory;
 import org.opengrok.indexer.analysis.vb.VBAnalyzerFactory;
 import org.opengrok.indexer.analysis.verilog.VerilogAnalyzerFactory;
+import org.opengrok.indexer.analysis.yang.YangAnalyzerFactory;
 import org.opengrok.indexer.analysis.yaml.YamlAnalyzerFactory;
 import org.opengrok.indexer.configuration.Project;
 import org.opengrok.indexer.configuration.RuntimeEnvironment;
@@ -263,6 +264,7 @@ public class AnalyzerGuru {
                 new BZip2AnalyzerFactory(),
                 new XMLAnalyzerFactory(),
                 new YamlAnalyzerFactory(),
+                new YangAnalyzerFactory(),
                 MandocAnalyzerFactory.DEFAULT_INSTANCE,
                 TroffAnalyzerFactory.DEFAULT_INSTANCE,
                 new ELFAnalyzerFactory(),
@@ -353,7 +355,7 @@ public class AnalyzerGuru {
      * has been called.
      */
     public static long getVersionNo() {
-        final int ver32 = 20230921_00; // Edit comment above too!
+        final int ver32 = 20260217_00; // Edit comment above too!
         long ver = ver32;
         if (customizationHashCode != 0) {
             ver |= (long) customizationHashCode << 32;

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/yang/YangAnalyzer.java

@@ -0,0 +1,40 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * See LICENSE.txt included in this distribution for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at LICENSE.txt.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2026, Oracle and/or its affiliates.
+ */
+package org.opengrok.indexer.analysis.yang;
+
+import org.opengrok.indexer.analysis.AnalyzerFactory;
+import org.opengrok.indexer.analysis.plain.PlainAnalyzer;
+
+/**
+ * Analyzer for YANG files with plain-text indexing and xref behavior.
+ */
+public class YangAnalyzer extends PlainAnalyzer {
+
+    /**
+     * Creates a new instance of YangAnalyzer.
+     * @param factory defined instance for the analyzer
+     */
+    protected YangAnalyzer(AnalyzerFactory factory) {
+        super(factory);
+    }
+}

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/yang/YangAnalyzerFactory.java

@@ -0,0 +1,48 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * See LICENSE.txt included in this distribution for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at LICENSE.txt.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2026, Oracle and/or its affiliates.
+ */
+package org.opengrok.indexer.analysis.yang;
+
+import org.opengrok.indexer.analysis.AbstractAnalyzer;
+import org.opengrok.indexer.analysis.FileAnalyzerFactory;
+
+/**
+ * Factory for YANG files.
+ */
+public class YangAnalyzerFactory extends FileAnalyzerFactory {
+
+    private static final String NAME = "Yang";
+
+    private static final String[] SUFFIXES = {
+        "YANG"
+    };
+
+    public YangAnalyzerFactory() {
+        super(null, null, SUFFIXES, null, null, "text/plain",
+                AbstractAnalyzer.Genre.PLAIN, NAME, true);
+    }
+
+    @Override
+    protected AbstractAnalyzer newAnalyzer() {
+        return new YangAnalyzer(this);
+    }
+}

opengrok-indexer/src/test/java/org/opengrok/indexer/analysis/AnalyzerGuruTest.java

@@ -48,6 +48,7 @@
 import org.opengrok.indexer.analysis.plain.XMLAnalyzer;
 import org.opengrok.indexer.analysis.sh.ShAnalyzer;
 import org.opengrok.indexer.analysis.sh.ShAnalyzerFactory;
+import org.opengrok.indexer.analysis.yang.YangAnalyzer;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -66,6 +67,15 @@ class AnalyzerGuruTest {
     void testGetFileTypeDescriptions() {
         Map<String, String> map = AnalyzerGuru.getfileTypeDescriptions();
         assertFalse(map.isEmpty());
+        assertEquals("Yang", map.get("yang"));
+    }
+
+    @Test
+    void testYangAnalyzerBySuffix() throws Exception {
+        ByteArrayInputStream in = new ByteArrayInputStream(
+                "module example-yang {}".getBytes(StandardCharsets.UTF_8));
+        AbstractAnalyzer fa = AnalyzerGuru.getAnalyzer(in, "/dummy/file.yang");
+        assertSame(YangAnalyzer.class, fa.getClass());
     }
 
     /**