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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.renderers;

import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;

/**
 * A generic writer that formats input items into rows and columns per the
 * provided column descriptors.
 *
 * @author Brian Remedios
 * @param 
 * @deprecated This is internal API and an implementation detail for {@link CSVRenderer}.
 */
class CSVWriter {

    private final String separator; // e.g., the comma
    private final String lineSeparator; // cr
    private final List> columns;

    CSVWriter(List> theColumns, String theSeparator, String theLineSeparator) {
        columns = theColumns;
        separator = theSeparator;
        lineSeparator = theLineSeparator;
    }

    public void writeTitles(Writer writer) throws IOException {
        StringBuilder buf = new StringBuilder(300);
        for (int i = 0; i < columns.size() - 1; i++) {
            quoteAndCommify(buf, columns.get(i).title);
        }

        quote(buf, columns.get(columns.size() - 1).title);

        buf.append(lineSeparator);
        writer.write(buf.toString());
    }

    public void writeData(Writer writer, Iterator items) throws IOException {

        int count = 1;

        StringBuilder buf = new StringBuilder(300);

        T rv;
        final int lastColumnIdx = columns.size() - 1;

        while (items.hasNext()) {
            buf.setLength(0);
            rv = items.next();

            for (int i = 0; i < lastColumnIdx; i++) {
                quoteAndCommify(buf, columns.get(i).accessor.get(count, rv, separator));
            }

            quote(buf, columns.get(lastColumnIdx).accessor.get(count, rv, separator));

            buf.append(lineSeparator);
            writer.write(buf.toString());
            count++;
        }
    }

    private void quote(StringBuilder buffer, String s) {
        if (s == null) {
            s = "";
        }
        buffer.append('"').append(s).append('"');
    }

    private void quoteAndCommify(StringBuilder buffer, String s) {
        quote(buffer, s);
        buffer.append(separator);
    }
}