/usr/share/doc/libjanino-java/samples/DeclarationCounter.java is in libjanino-java-doc 2.7.0-2.
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* Janino - An embedded Java[TM] compiler
*
* Copyright (c) 2001-2010, Arno Unkrig
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.codehaus.janino.samples;
import java.io.*;
import org.codehaus.commons.compiler.CompileException;
import org.codehaus.janino.*;
import org.codehaus.janino.util.*;
/**
* An example application for the {@link org.codehaus.janino.util.Traverser}:
* Reads, scans and parses the files named on the command line and counts
* several kinds of declarations.
*/
public
class DeclarationCounter extends Traverser {
public static void
main(String[] args) throws CompileException, IOException {
DeclarationCounter dc = new DeclarationCounter();
for (int i = 0; i < args.length; ++i) {
String fileName = args[i];
// Parse each compilation unit.
FileReader r = new FileReader(fileName);
Java.CompilationUnit cu;
try {
cu = new Parser(new Scanner(fileName, r)).parseCompilationUnit();
} finally {
r.close();
}
// Traverse it and count declarations.
dc.traverseCompilationUnit(cu);
}
System.out.println("Class declarations: " + dc.classDeclarationCount);
System.out.println("Interface declarations: " + dc.interfaceDeclarationCount);
System.out.println("Fields: " + dc.fieldCount);
System.out.println("Local variables: " + dc.localVariableCount);
}
// Count class declarations.
@Override public void
traverseClassDeclaration(Java.ClassDeclaration cd) {
++this.classDeclarationCount;
super.traverseClassDeclaration(cd);
}
private int classDeclarationCount;
// Count interface declarations.
@Override public void
traverseInterfaceDeclaration(Java.InterfaceDeclaration id) {
++this.interfaceDeclarationCount;
super.traverseInterfaceDeclaration(id);
}
private int interfaceDeclarationCount;
// Count fields.
@Override public void
traverseFieldDeclaration(Java.FieldDeclaration fd) {
this.fieldCount += fd.variableDeclarators.length;
super.traverseFieldDeclaration(fd);
}
private int fieldCount;
// Count local variables.
@Override public void
traverseLocalVariableDeclarationStatement(Java.LocalVariableDeclarationStatement lvds) {
this.localVariableCount += lvds.variableDeclarators.length;
super.traverseLocalVariableDeclarationStatement(lvds);
}
private int localVariableCount;
}
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