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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically
embedded into Java applications to provide scripting to end users.
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript.tools.jsc;
import java.io.*;
import java.util.*;
import org.mozilla.javascript.*;
import org.mozilla.javascript.optimizer.ClassCompiler;
import org.mozilla.javascript.tools.SourceReader;
import org.mozilla.javascript.tools.ToolErrorReporter;
/**
* @author Norris Boyd
*/
public class Main {
/**
* Main entry point.
*
* Process arguments as would a normal Java program.
* Then set up the execution environment and begin to
* compile scripts.
*/
public static void main(String args[])
{
Main main = new Main();
args = main.processOptions(args);
if (args == null) {
if (main.printHelp) {
System.out.println(ToolErrorReporter.getMessage(
"msg.jsc.usage", Main.class.getName()));
System.exit(0);
}
System.exit(1);
}
if (!main.reporter.hasReportedError()) {
main.processSource(args);
}
}
public Main()
{
reporter = new ToolErrorReporter(true);
compilerEnv = new CompilerEnvirons();
compilerEnv.setErrorReporter(reporter);
compiler = new ClassCompiler(compilerEnv);
}
/**
* Parse arguments.
*
*/
public String[] processOptions(String args[])
{
targetPackage = ""; // default to no package
compilerEnv.setGenerateDebugInfo(false); // default to no symbols
for (int i=0; i < args.length; i++) {
String arg = args[i];
if (!arg.startsWith("-")) {
int tail = args.length - i;
if (targetName != null && tail > 1) {
addError("msg.multiple.js.to.file", targetName);
return null;
}
String[] result = new String[tail];
for (int j = 0; j != tail; ++j) {
result[j] = args[i + j];
}
return result;
}
if (arg.equals("-help") || arg.equals("-h")
|| arg.equals("--help"))
{
printHelp = true;
return null;
}
try {
if (arg.equals("-version") && ++i < args.length) {
int version = Integer.parseInt(args[i]);
compilerEnv.setLanguageVersion(version);
continue;
}
if ((arg.equals("-opt") || arg.equals("-O")) &&
++i < args.length)
{
int optLevel = Integer.parseInt(args[i]);
compilerEnv.setOptimizationLevel(optLevel);
continue;
}
}
catch (NumberFormatException e) {
badUsage(args[i]);
return null;
}
if (arg.equals("-nosource")) {
compilerEnv.setGeneratingSource(false);
continue;
}
if (arg.equals("-debug") || arg.equals("-g")) {
compilerEnv.setGenerateDebugInfo(true);
continue;
}
if (arg.equals("-main-method-class") && ++i < args.length) {
compiler.setMainMethodClass(args[i]);
continue;
}
if (arg.equals("-encoding") && ++i < args.length) {
characterEncoding = args[i];
continue;
}
if (arg.equals("-o") && ++i < args.length) {
String name = args[i];
int end = name.length();
if (end == 0
|| !Character.isJavaIdentifierStart(name.charAt(0)))
{
addError("msg.invalid.classfile.name", name);
continue;
}
for (int j = 1; j < end; j++) {
char c = name.charAt(j);
if (!Character.isJavaIdentifierPart(c)) {
if (c == '.') {
// check if it is the dot in .class
if (j == end - 6 && name.endsWith(".class")) {
name = name.substring(0, j);
break;
}
}
addError("msg.invalid.classfile.name", name);
break;
}
}
targetName = name;
continue;
}
if (arg.equals("-observe-instruction-count")) {
compilerEnv.setGenerateObserverCount(true);
}
if (arg.equals("-package") && ++i < args.length) {
String pkg = args[i];
int end = pkg.length();
for (int j = 0; j != end; ++j) {
char c = pkg.charAt(j);
if (Character.isJavaIdentifierStart(c)) {
for (++j; j != end; ++j) {
c = pkg.charAt(j);
if (!Character.isJavaIdentifierPart(c)) {
break;
}
}
if (j == end) {
break;
}
if (c == '.' && j != end - 1) {
continue;
}
}
addError("msg.package.name", targetPackage);
return null;
}
targetPackage = pkg;
continue;
}
if (arg.equals("-extends") && ++i < args.length) {
String targetExtends = args[i];
Class superClass;
try {
superClass = Class.forName(targetExtends);
} catch (ClassNotFoundException e) {
throw new Error(e.toString()); // TODO: better error
}
compiler.setTargetExtends(superClass);
continue;
}
if (arg.equals("-implements") && ++i < args.length) {
// TODO: allow for multiple comma-separated interfaces.
String targetImplements = args[i];
StringTokenizer st = new StringTokenizer(targetImplements,
",");
List> list = new ArrayList>();
while (st.hasMoreTokens()) {
String className = st.nextToken();
try {
list.add(Class.forName(className));
} catch (ClassNotFoundException e) {
throw new Error(e.toString()); // TODO: better error
}
}
Class[] implementsClasses = list.toArray(new Class[list.size()]);
compiler.setTargetImplements(implementsClasses);
continue;
}
if (arg.equals("-d") && ++i < args.length) {
destinationDir = args[i];
continue;
}
badUsage(arg);
return null;
}
// no file name
p(ToolErrorReporter.getMessage("msg.no.file"));
return null;
}
/**
* Print a usage message.
*/
private static void badUsage(String s) {
System.err.println(ToolErrorReporter.getMessage(
"msg.jsc.bad.usage", Main.class.getName(), s));
}
/**
* Compile JavaScript source.
*
*/
public void processSource(String[] filenames)
{
for (int i = 0; i != filenames.length; ++i) {
String filename = filenames[i];
if (!filename.endsWith(".js")) {
addError("msg.extension.not.js", filename);
return;
}
File f = new File(filename);
String source = readSource(f);
if (source == null) return;
String mainClassName = targetName;
if (mainClassName == null) {
String name = f.getName();
String nojs = name.substring(0, name.length() - 3);
mainClassName = getClassName(nojs);
}
if (targetPackage.length() != 0) {
mainClassName = targetPackage+"."+mainClassName;
}
Object[] compiled
= compiler.compileToClassFiles(source, filename, 1,
mainClassName);
if (compiled == null || compiled.length == 0) {
return;
}
File targetTopDir = null;
if (destinationDir != null) {
targetTopDir = new File(destinationDir);
} else {
String parent = f.getParent();
if (parent != null) {
targetTopDir = new File(parent);
}
}
for (int j = 0; j != compiled.length; j += 2) {
String className = (String)compiled[j];
byte[] bytes = (byte[])compiled[j + 1];
File outfile = getOutputFile(targetTopDir, className);
try {
FileOutputStream os = new FileOutputStream(outfile);
try {
os.write(bytes);
} finally {
os.close();
}
} catch (IOException ioe) {
addFormatedError(ioe.toString());
}
}
}
}
private String readSource(File f)
{
String absPath = f.getAbsolutePath();
if (!f.isFile()) {
addError("msg.jsfile.not.found", absPath);
return null;
}
try {
return (String)SourceReader.readFileOrUrl(absPath, true,
characterEncoding);
} catch (FileNotFoundException ex) {
addError("msg.couldnt.open", absPath);
} catch (IOException ioe) {
addFormatedError(ioe.toString());
}
return null;
}
private File getOutputFile(File parentDir, String className)
{
String path = className.replace('.', File.separatorChar);
path = path.concat(".class");
File f = new File(parentDir, path);
String dirPath = f.getParent();
if (dirPath != null) {
File dir = new File(dirPath);
if (!dir.exists()) {
dir.mkdirs();
}
}
return f;
}
/**
* Verify that class file names are legal Java identifiers. Substitute
* illegal characters with underscores, and prepend the name with an
* underscore if the file name does not begin with a JavaLetter.
*/
String getClassName(String name) {
char[] s = new char[name.length()+1];
char c;
int j = 0;
if (!Character.isJavaIdentifierStart(name.charAt(0))) {
s[j++] = '_';
}
for (int i=0; i < name.length(); i++, j++) {
c = name.charAt(i);
if ( Character.isJavaIdentifierPart(c) ) {
s[j] = c;
} else {
s[j] = '_';
}
}
return (new String(s)).trim();
}
private static void p(String s) {
System.out.println(s);
}
private void addError(String messageId, String arg)
{
String msg;
if (arg == null) {
msg = ToolErrorReporter.getMessage(messageId);
} else {
msg = ToolErrorReporter.getMessage(messageId, arg);
}
addFormatedError(msg);
}
private void addFormatedError(String message)
{
reporter.error(message, null, -1, null, -1);
}
private boolean printHelp;
private ToolErrorReporter reporter;
private CompilerEnvirons compilerEnv;
private ClassCompiler compiler;
private String targetName;
private String targetPackage;
private String destinationDir;
private String characterEncoding;
}
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