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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;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileReader;
import org.codehaus.groovy.antlr.parser.GroovyLexer;
import org.codehaus.groovy.antlr.parser.GroovyRecognizer;
import antlr.ASTFactory;
import antlr.CommonAST;
import antlr.Token;
import antlr.collections.AST;
import antlr.debug.misc.ASTFrame;
class Main {
static boolean whitespaceIncluded = false;
static boolean showTree = false;
//static boolean xml = false;
static boolean verbose = false;
public static void main(String[] args) {
// Use a try/catch block for parser exceptions
try {
// if we have at least one command-line argument
if (args.length > 0 ) {
System.err.println("Parsing...");
// for each directory/file specified on the command line
for(int i=0; i< args.length;i++) {
if ( args[i].equals("-showtree") ) {
showTree = true;
}
//else if ( args[i].equals("-xml") ) {
// xml = true;
//}
else if ( args[i].equals("-verbose") ) {
verbose = true;
}
else if ( args[i].equals("-trace") ) {
GroovyRecognizer.tracing = true;
GroovyLexer.tracing = true;
}
else if ( args[i].equals("-traceParser") ) {
GroovyRecognizer.tracing = true;
}
else if ( args[i].equals("-traceLexer") ) {
GroovyLexer.tracing = true;
}
else if ( args[i].equals("-whitespaceIncluded") ) {
whitespaceIncluded = true;
}
else {
doFile(new File(args[i])); // parse it
}
} }
else
System.err.println("Usage: java -jar groovyc.jar [-showtree] [-verbose] [-trace{,Lexer,Parser}]"+
"");
}
catch(Exception e) {
System.err.println("exception: "+e);
e.printStackTrace(System.err); // so we can get stack trace
}
}
// This method decides what action to take based on the type of
// file we are looking at
public static void doFile(File f)
throws Exception {
// If this is a directory, walk each file/dir in that directory
if (f.isDirectory()) {
String files[] = f.list();
for(int i=0; i < files.length; i++)
doFile(new File(f, files[i]));
}
// otherwise, if this is a groovy file, parse it!
else if (f.getName().endsWith(".groovy")) {
System.err.println(" --- "+f.getAbsolutePath());
// parseFile(f.getName(), new FileInputStream(f));
SourceBuffer sourceBuffer = new SourceBuffer();
UnicodeEscapingReader unicodeReader = new UnicodeEscapingReader(new FileReader(f),sourceBuffer);
GroovyLexer lexer = new GroovyLexer(unicodeReader);
unicodeReader.setLexer(lexer);
parseFile(f.getName(),lexer,sourceBuffer);
}
}
// Here's where we do the real work...
public static void parseFile(String f, GroovyLexer l, SourceBuffer sourceBuffer)
throws Exception {
try {
// Create a parser that reads from the scanner
GroovyRecognizer parser = GroovyRecognizer.make(l);
parser.setSourceBuffer(sourceBuffer);
parser.setFilename(f);
if (whitespaceIncluded) {
GroovyLexer lexer = parser.getLexer();
lexer.setWhitespaceIncluded(true);
while (true) {
Token t = lexer.nextToken();
System.out.println(t);
if (t == null || t.getType() == Token.EOF_TYPE) break;
}
return;
}
// start parsing at the compilationUnit rule
parser.compilationUnit();
System.out.println("parseFile "+f+" => "+parser.getAST());
// do something with the tree
doTreeAction(f, parser.getAST(), parser.getTokenNames());
}
catch (Exception e) {
System.err.println("parser exception: "+e);
e.printStackTrace(); // so we can get stack trace
}
}
public static void doTreeAction(String f, AST t, String[] tokenNames) {
if ( t==null ) return;
if ( showTree ) {
CommonAST.setVerboseStringConversion(true, tokenNames);
ASTFactory factory = new ASTFactory();
AST r = factory.create(0,"AST ROOT");
r.setFirstChild(t);
final ASTFrame frame = new ASTFrame("Groovy AST", r);
frame.setVisible(true);
frame.addWindowListener(
new WindowAdapter() {
public void windowClosing (WindowEvent e) {
frame.setVisible(false); // hide the Frame
frame.dispose();
System.exit(0);
}
}
);
if (verbose) System.out.println(t.toStringList());
}
/*if ( xml ) {
((CommonAST)t).setVerboseStringConversion(true, tokenNames);
ASTFactory factory = new ASTFactory();
AST r = factory.create(0,"AST ROOT");
r.setFirstChild(t);
XStream xstream = new XStream();
xstream.alias("ast", CommonAST.class);
try {
xstream.toXML(r,new FileWriter(f + ".xml"));
System.out.println("Written AST to " + f + ".xml");
} catch (Exception e) {
System.out.println("couldn't write to " + f + ".xml");
e.printStackTrace();
}
//if (verbose) System.out.println(t.toStringList());
}*/
/*@todo
GroovyTreeParser tparse = new GroovyTreeParser();
try {
tparse.compilationUnit(t);
if (verbose) System.out.println("successful walk of result AST for "+f);
}
catch (RecognitionException e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
@todo*/
}
}