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");
}
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;
}