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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.lang;

import java.util.Collections;
import java.util.List;

import net.sourceforge.pmd.lang.ast.Parser;
import net.sourceforge.pmd.lang.metrics.LanguageMetricsProvider;
import net.sourceforge.pmd.lang.rule.xpath.impl.XPathHandler;
import net.sourceforge.pmd.reporting.ViolationDecorator;
import net.sourceforge.pmd.reporting.ViolationSuppressor;
import net.sourceforge.pmd.util.designerbindings.DesignerBindings;
import net.sourceforge.pmd.util.designerbindings.DesignerBindings.DefaultDesignerBindings;


/**
 * Interface for obtaining the classes necessary for checking source files of a
 * specific language.
 *
 * @author pieter_van_raemdonck - Application Engineers NV/SA - www.ae.be
 */
public interface LanguageVersionHandler {


    /**
     * Get the XPathHandler.
     */
    default XPathHandler getXPathHandler() {
        return XPathHandler.noFunctionDefinitions();
    }


    /**
     * Returns the parser instance.
     */
    Parser getParser();

    /**
     * Returns the language-specific violation decorator.
     */
    default ViolationDecorator getViolationDecorator() {
        return ViolationDecorator.noop();
    }

    /**
     * Returns additional language-specific violation suppressors.
     * These take precedence over the default suppressors (eg nopmd comment),
     * but do not replace them.
     */
    default List getExtraViolationSuppressors() {
        return Collections.emptyList();
    }


    /**
     * Returns the metrics provider for this language version,
     * or null if it has none.
     */
    default LanguageMetricsProvider getLanguageMetricsProvider() {
        return null;
    }


    /**
     * Returns the designer bindings for this language version.
     * Null is not an acceptable result, use {@link DefaultDesignerBindings#getInstance()}
     * instead.
     *
     * @since 6.20.0
     */
    default DesignerBindings getDesignerBindings() {
        return DefaultDesignerBindings.getInstance();
    }

}