Same for kotlin

pmd-kotlin/pom.xml

@@ -17,6 +17,27 @@
                 <groupId>org.antlr</groupId>
                 <artifactId>antlr4-maven-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-antrun-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>antlr-cleanup</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>run</goal>
+                        </goals>
+                        <configuration>
+                            <target>
+                                <ant antfile="${antlr4.ant.wrapper}" target="cpd-language">
+                                    <property name="lang-name" value="Kotlin" />
+                                    <property name="lang-terse-name" value="kotlin" />
+                                </ant>
+                            </target>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
 
             <plugin>
                 <artifactId>maven-resources-plugin</artifactId>

pmd-kotlin/src/main/antlr4/net/sourceforge/pmd/lang/kotlin/ast/KotlinLexer.g4

@@ -10,7 +10,7 @@
  * https://github.com/JetBrains/kotlin/tree/master/compiler/testData/psi
  */
 
-lexer grammar Kotlin;
+lexer grammar KotlinLexer;
 
 /**
  * Taken from http://www.antlr3.org/grammar/1345144569663/AntlrUnicode.txt

pmd-kotlin/src/main/java/net/sourceforge/pmd/cpd/KotlinTokenizer.java

@@ -10,7 +10,7 @@ import net.sourceforge.pmd.cpd.internal.AntlrTokenizer;
 import net.sourceforge.pmd.cpd.token.AntlrTokenFilter;
 import net.sourceforge.pmd.lang.ast.impl.antlr4.AntlrToken;
 import net.sourceforge.pmd.lang.ast.impl.antlr4.AntlrTokenManager;
-import net.sourceforge.pmd.lang.kotlin.antlr4.Kotlin;
+import net.sourceforge.pmd.lang.kotlin.ast.KotlinLexer;
 
 /**
  * The Kotlin Tokenizer
@@ -20,7 +20,7 @@ public class KotlinTokenizer extends AntlrTokenizer {
     @Override
     protected AntlrTokenManager getLexerForSource(SourceCode sourceCode) {
         CharStream charStream = AntlrTokenizer.getCharStreamFromSourceCode(sourceCode);
-        return new AntlrTokenManager(new Kotlin(charStream), sourceCode.getFileName());
+        return new AntlrTokenManager(new KotlinLexer(charStream), sourceCode.getFileName());
     }
 
     @Override
@@ -52,15 +52,15 @@ public class KotlinTokenizer extends AntlrTokenizer {
 
         private void skipPackageAndImport(final AntlrToken currentToken) {
             final int type = currentToken.getKind();
-            if (type == Kotlin.PACKAGE || type == Kotlin.IMPORT) {
+            if (type == KotlinLexer.PACKAGE || type == KotlinLexer.IMPORT) {
                 discardingPackageAndImport = true;
-            } else if (discardingPackageAndImport && (type == Kotlin.SEMICOLON || type == Kotlin.NL)) {
+            } else if (discardingPackageAndImport && (type == KotlinLexer.SEMICOLON || type == KotlinLexer.NL)) {
                 discardingPackageAndImport = false;
             }
         }
 
         private void skipNewLines(final AntlrToken currentToken) {
-            discardingNL = currentToken.getKind() == Kotlin.NL;
+            discardingNL = currentToken.getKind() == KotlinLexer.NL;
         }
 
         @Override