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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 antlr.collections.AST;
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.MindMapPrinter;
import org.codehaus.groovy.antlr.treewalker.NodePrinter;
import org.codehaus.groovy.antlr.treewalker.PreOrderTraversal;
import org.codehaus.groovy.antlr.treewalker.SourceCodeTraversal;
import org.codehaus.groovy.antlr.treewalker.SourcePrinter;
import org.codehaus.groovy.antlr.treewalker.Visitor;
import org.codehaus.groovy.runtime.ResourceGroovyMethods;
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.Iterator;
import java.util.List;
public class Java2GroovyProcessor {
public static void processFiles(List fileNames) throws Exception {
Iterator i = fileNames.iterator();
while (i.hasNext()) {
String filename = (String) i.next();
File f = new File(filename);
String text = ResourceGroovyMethods.getText(f);
System.out.println(convert(filename, text, true, true));
}
}
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".toLowerCase()))) { // uppercase to hide from jarjar
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());
}
private static void groovifyFatJavaLikeGroovyAST(AST ast, String[] groovyTokenNames) {
Visitor groovifier = new Groovifier(groovyTokenNames);
AntlrASTProcessor groovifierTraverser = new PreOrderTraversal(groovifier);
groovifierTraverser.process(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);
}
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();
}
}