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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codehaus.groovy.antlr.java;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.io.StringReader;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.PosixParser;
import org.codehaus.groovy.antlr.AntlrASTProcessor;
import org.codehaus.groovy.antlr.SourceBuffer;
import org.codehaus.groovy.antlr.UnicodeEscapingReader;
import org.codehaus.groovy.antlr.parser.GroovyLexer;
import org.codehaus.groovy.antlr.parser.GroovyRecognizer;
import org.codehaus.groovy.antlr.treewalker.*;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import antlr.collections.AST;
public class Java2GroovyMain {
public static void main(String[] args) {
try{
Options options = new Options();
PosixParser cliParser = new PosixParser();
CommandLine cli = cliParser.parse(options, args);
String[] filenames = cli.getArgs();
if( filenames.length == 0 ) {
System.err.println("Needs at least one filename");
}
List filenameList = Arrays.asList(filenames);
Iterator i = filenameList.iterator();
while (i.hasNext()) {
String filename = (String) i.next();
File f = new File(filename);
String text = DefaultGroovyMethods.getText(f);
System.out.println(convert(filename, text, true, true));
}
} catch (Throwable t) {
t.printStackTrace();
}
}
public static String convert(String filename, String input) throws Exception{
return convert(filename, input, false, false);
}
public static String convert(String filename, String input,boolean withHeader, boolean withNewLines) throws Exception{
JavaRecognizer parser = getJavaParser(input);
String[] tokenNames = parser.getTokenNames();
parser.compilationUnit();
AST ast = parser.getAST();
// output AST in format suitable for opening in http://freemind.sourceforge.net
// which is a really nice way of seeing the AST, folding nodes etc
if ("mindmap".equals(System.getProperty("antlr.ast"))) {
try {
PrintStream out = new PrintStream(new FileOutputStream(filename + ".mm"));
Visitor visitor = new MindMapPrinter(out,tokenNames);
AntlrASTProcessor treewalker = new PreOrderTraversal(visitor);
treewalker.process(ast);
} catch (FileNotFoundException e) {
System.out.println("Cannot create " + filename + ".mm");
}
}
// modify the Java AST into a Groovy AST
modifyJavaASTintoGroovyAST(tokenNames, ast);
String[] groovyTokenNames = getGroovyTokenNames(input);
// groovify the fat Java-Like Groovy AST
groovifyFatJavaLikeGroovyAST(ast, groovyTokenNames);
// now output
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Visitor visitor = new SourcePrinter(new PrintStream(baos),groovyTokenNames, withNewLines);
AntlrASTProcessor traverser = new SourceCodeTraversal(visitor);
traverser.process(ast);
String header = "";
if (withHeader) {
header = "/*\n" +
" Automatically Converted from Java Source \n" +
" \n" +
" by java2groovy v0.0.1 Copyright Jeremy Rayner 2007\n" +
" \n" +
" !! NOT FIT FOR ANY PURPOSE !! \n" +
" 'java2groovy' cannot be used to convert one working program into another" +
" */\n\n";
}
return header + new String(baos.toByteArray());
}
/**
* @param ast
* @param groovyTokenNames
*/
private static void groovifyFatJavaLikeGroovyAST(AST ast, String[] groovyTokenNames) {
Visitor groovifier = new Groovifier(groovyTokenNames);
AntlrASTProcessor groovifierTraverser = new PreOrderTraversal(groovifier);
groovifierTraverser.process(ast);
}
/**
* @param tokenNames
* @param ast
*/
private static void modifyJavaASTintoGroovyAST(String[] tokenNames, AST ast) {
// mutate the tree when in Javaland
Visitor preJava2groovyConverter = new PreJava2GroovyConverter(tokenNames);
AntlrASTProcessor preJava2groovyTraverser = new PreOrderTraversal(preJava2groovyConverter);
preJava2groovyTraverser.process(ast);
// map the nodes to Groovy types
Visitor java2groovyConverter = new Java2GroovyConverter(tokenNames);
AntlrASTProcessor java2groovyTraverser = new PreOrderTraversal(java2groovyConverter);
java2groovyTraverser.process(ast);
}
/**
* @param input
* @return
*/
private static JavaRecognizer getJavaParser(String input) {
JavaRecognizer parser = null;
SourceBuffer sourceBuffer = new SourceBuffer();
UnicodeEscapingReader unicodeReader = new UnicodeEscapingReader(new StringReader(input),sourceBuffer);
JavaLexer lexer = new JavaLexer(unicodeReader);
unicodeReader.setLexer(lexer);
parser = JavaRecognizer.make(lexer);
parser.setSourceBuffer(sourceBuffer);
return parser;
}
public static String mindmap(String input) throws Exception{
JavaRecognizer parser = getJavaParser(input);
String[] tokenNames = parser.getTokenNames();
parser.compilationUnit();
AST ast = parser.getAST();
// modify the Java AST into a Groovy AST
modifyJavaASTintoGroovyAST(tokenNames, ast);
String[] groovyTokenNames = getGroovyTokenNames(input);
// groovify the fat Java-Like Groovy AST
groovifyFatJavaLikeGroovyAST(ast, groovyTokenNames);
// now output
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Visitor visitor = new MindMapPrinter(new PrintStream(baos),groovyTokenNames);
AntlrASTProcessor traverser = new SourceCodeTraversal(visitor);
traverser.process(ast);
return new String(baos.toByteArray());
}
public static String nodePrinter(String input) throws Exception{
JavaRecognizer parser = getJavaParser(input);
String[] tokenNames = parser.getTokenNames();
parser.compilationUnit();
AST ast = parser.getAST();
// modify the Java AST into a Groovy AST
modifyJavaASTintoGroovyAST(tokenNames, ast);
String[] groovyTokenNames = getGroovyTokenNames(input);
// groovify the fat Java-Like Groovy AST
groovifyFatJavaLikeGroovyAST(ast, groovyTokenNames);
// now output
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Visitor visitor = new NodePrinter(new PrintStream(baos),groovyTokenNames);
AntlrASTProcessor traverser = new SourceCodeTraversal(visitor);
traverser.process(ast);
return new String(baos.toByteArray());
}
private static String[] getGroovyTokenNames(String input) {
GroovyRecognizer groovyParser = null;
SourceBuffer groovySourceBuffer = new SourceBuffer();
UnicodeEscapingReader groovyUnicodeReader = new UnicodeEscapingReader(new StringReader(input),groovySourceBuffer);
GroovyLexer groovyLexer = new GroovyLexer(groovyUnicodeReader);
groovyUnicodeReader.setLexer(groovyLexer);
groovyParser = GroovyRecognizer.make(groovyLexer);
return groovyParser.getTokenNames();
}
}