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PMD is an extensible multilanguage static code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It's mainly concerned with Java and Apex, but supports 16 other languages. It comes with 400+ built-in rules. It can be extended with custom rules. It uses JavaCC and Antlr to parse source files into abstract syntax trees (AST) and runs rules against them to find violations. Rules can be written in Java or using a XPath query. Currently, PMD supports Java, JavaScript, Salesforce.com Apex and Visualforce, Kotlin, Swift, Modelica, PLSQL, Apache Velocity, JSP, WSDL, Maven POM, HTML, XML and XSL. Scala is supported, but there are currently no Scala rules available. Additionally, it includes CPD, the copy-paste-detector. CPD finds duplicated code in Coco, C/C++, C#, Dart, Fortran, Gherkin, Go, Groovy, HTML, Java, JavaScript, JSP, Julia, Kotlin, Lua, Matlab, Modelica, Objective-C, Perl, PHP, PLSQL, Python, Ruby, Salesforce.com Apex and Visualforce, Scala, Swift, T-SQL, Typescript, Apache Velocity, WSDL, XML and XSL.

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/*
 * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
 */

package net.sourceforge.pmd.cpd;

import net.sourceforge.pmd.lang.Language;
import net.sourceforge.pmd.lang.LanguagePropertyBundle;

/**
 * A language that supports {@link CpdAnalysis CPD}.
 *
 * @author Clément Fournier
 */
public interface CpdCapableLanguage extends Language {


    /**
     * Create a new {@link CpdLexer} for this language, given
     * a property bundle with configuration. The bundle was created by
     * this instance using {@link #newPropertyBundle()}. It can be assumed
     * that the bundle will never be mutated anymore, and this method
     * takes ownership of it.
     *
     * @param bundle A bundle of properties created by this instance.
     *
     * @return A new language processor
     */
    default CpdLexer createCpdLexer(LanguagePropertyBundle bundle) {
        return new AnyCpdLexer();
    }
}