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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.
/*
* BSD-style license; for more info see http://pmd.sourceforge.net/license.html
*/
// stolen from XPath Explorer (http://www.xpathexplorer.com)
package net.sourceforge.pmd.cpd;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
class GridBagHelper {
GridBagLayout gridbag;
Container container;
GridBagConstraints c;
int x = 0;
int y = 0;
int labelAlignment = SwingConstants.RIGHT;
double[] weights;
GridBagHelper(Container container, double[] weights) {
this.container = container;
this.weights = weights;
gridbag = new GridBagLayout();
container.setLayout(gridbag);
c = new GridBagConstraints();
c.insets = new Insets(2, 2, 2, 2);
c.anchor = GridBagConstraints.EAST;
c.fill = GridBagConstraints.HORIZONTAL;
}
public void add(Component component) {
add(component, 1);
}
public void add(Component component, int width) {
c.gridx = x;
c.gridy = y;
c.weightx = weights[x];
c.gridwidth = width;
gridbag.setConstraints(component, c);
container.add(component);
x += width;
}
public void nextRow() {
y++;
x = 0;
}
public void addLabel(String label) {
add(new JLabel(label, labelAlignment));
}
}