public static void main(final String[] args) {
final Context context = new Context();
final List<CompileParameter> parameters = initializeParameters(context, ".");
final int returnCode =
parse(args, context, parameters) ? (processContext(context, parameters) ? 0 : 1) : 2;
context.close();
System.exit(returnCode);
}
private static void showHelpAndExit(
final Context context, final boolean headers, final List<CompileParameter> parameters) {
if (headers) {
context.show("DSL Platform - Command-Line Client (" + Main.getVersion() + ")");
context.show(
"This tool allows you to compile provided DSL to various languages such as Java, Scala, PHP, C#, etc... or create an SQL migration between two DSL models.");
}
context.show();
context.show();
context.show("Command parameters:");
int max = 0;
for (final CompileParameter cp : parameters) {
if (cp.getShortDescription() == null) {
continue;
}
int width = cp.getAlias().length();
if (cp.getUsage() != null) {
width += 1 + cp.getUsage().length();
}
if (max < width) {
max = width;
}
}
max += 2;
for (final CompileParameter cp : parameters) {
if (cp.getShortDescription() == null) {
continue;
}
final StringBuilder sb = new StringBuilder();
sb.append(" -").append(cp.getAlias());
int len = max - cp.getAlias().length();
if (cp.getUsage() != null) {
sb.append("=").append(cp.getUsage());
len -= cp.getUsage().length() + 1;
}
for (; len >= 0; len--) {
sb.append(' ');
}
sb.append(cp.getShortDescription());
context.show(sb.toString());
}
context.show();
context.show("Example usages:");
context.show("\ttarget=java_client,revenj.java postgres=localhost/Database?user=postgres");
context.show(
"\tjava_client=model.jar revenj.net=Model.dll postgres=localhost/Database?user=postgres");
context.show("\tproperties=development.props download");
}
public static boolean processContext(
final Context context, final List<CompileParameter> parameters) {
try {
context.notify("PROCESS", parameters);
for (final CompileParameter cp : parameters) {
if (!cp.check(context)) {
if (cp.getDetailedDescription() != null) {
context.show();
context.show();
context.show(cp.getDetailedDescription());
}
return false;
}
}
for (final CompileParameter cp : parameters) {
cp.run(context);
}
return true;
} catch (ExitException ex) {
return false;
}
}
public static List<CompileParameter> initializeParameters(
final Context context, final String path) {
final List<CompileParameter> parameters =
new ArrayList<CompileParameter>(DEFAULT_PARAMETERS.length + 2);
parameters.add(new Help(parameters));
parameters.add(new PropertiesFile(parameters));
Collections.addAll(parameters, DEFAULT_PARAMETERS);
final File loc = new File(path);
final File[] jars =
loc.listFiles(
new FileFilter() {
public boolean accept(File file) {
return file.getPath().toLowerCase().endsWith(".jar");
}
});
final List<URL> urls = new ArrayList<URL>(jars != null ? jars.length : 0);
if (jars != null) {
for (final File j : jars) {
try {
urls.add(j.toURI().toURL());
} catch (MalformedURLException ex) {
context.error(ex);
}
}
}
final URLClassLoader ucl = new URLClassLoader(urls.toArray(new URL[urls.size()]));
final ServiceLoader<CompileParameter> plugins = ServiceLoader.load(CompileParameter.class, ucl);
for (final CompileParameter cp : plugins) {
parameters.add(cp);
}
// HACK: service loader will lock jars on Windows
// close is not available in Java6, so use reflection to invoke it
if (Utils.isWindows()) {
try {
final Method close = ucl.getClass().getMethod("close");
if (close != null) {
close.invoke(ucl);
}
} catch (NoSuchMethodError ignore) {
} catch (Exception ignore) {
}
}
return parameters;
}
private static boolean parse(
final String[] args, final Context context, final List<CompileParameter> parameters) {
if (args.length == 1 && ("/?".equals(args[0]) || "-?".equals(args[0]) || "?".equals(args[0]))) {
showHelpAndExit(context, true, parameters);
return false;
}
final List<ParameterParser> customParsers = new ArrayList<ParameterParser>();
for (final CompileParameter cp : parameters) {
if (cp instanceof ParameterParser) {
customParsers.add((ParameterParser) cp);
}
}
final List<String> errors = new ArrayList<String>();
for (String a : args) {
if (a.startsWith("-") || a.startsWith("/")) a = a.substring(1);
final int eq = a.indexOf('=');
final String name = a.substring(0, eq != -1 ? eq : a.length());
final String value = eq == -1 ? null : a.substring(eq + 1);
final CompileParameter cp = from(name, parameters);
if (cp == null) {
boolean matched = false;
for (final ParameterParser parser : customParsers) {
final Either<Boolean> tryParse = parser.tryParse(name, value, context);
if (!tryParse.isSuccess()) {
errors.add(tryParse.explainError());
matched = true;
break;
} else if (tryParse.get()) {
matched = true;
break;
}
}
if (!matched) {
errors.add("Unknown parameter: " + name);
}
} else {
if (eq == -1 && cp.getUsage() != null) {
if (cp instanceof ParameterParser) {
Either<Boolean> tryParse = ((ParameterParser) cp).tryParse(name, null, context);
if (tryParse.isSuccess() && tryParse.get()) {
context.put(cp, null);
} else {
errors.add("Expecting " + cp.getUsage() + " after = for " + a);
}
} else {
errors.add("Expecting " + cp.getUsage() + " after = for " + a);
}
} else {
context.put(cp, value);
}
}
}
if (args.length == 0 || errors.size() > 0) {
for (final String err : errors) {
context.error(err);
}
showHelpAndExit(context, args.length == errors.size(), parameters);
return false;
}
return true;
}