/**
* Evaluates the line, including handling of special colon-prefixed REPL commands.
*
* @param line The line to evaluate.
* @return False iff the REPL should exit.
*/
public boolean evaluate(final String line) {
try {
final String tLine = line.trim();
if (tLine.equals(":help")) help();
else if (tLine.equals(":vars")) vars();
else if (tLine.equals(":langs")) langs();
else if (tLine.equals(":debug")) debug();
else if (tLine.startsWith(":lang ")) lang(line.substring(6).trim());
else if (tLine.equals(":quit")) return false;
else {
// ensure that a script language is active
if (interpreter == null) return true;
// pass the input to the current interpreter for evaluation
final Object result = interpreter.interpret(line);
if (result != ScriptInterpreter.MORE_INPUT_PENDING) {
out.println(s(result));
}
}
} catch (final ScriptException exc) {
// NB: Something went wrong interpreting the line of code.
// Let's just display the error message, unless we are in debug mode.
if (debug) exc.printStackTrace(out);
else {
final String msg = exc.getMessage();
out.println(msg == null ? exc.getClass().getName() : msg);
}
} catch (final Throwable exc) {
// NB: Something unusual went wrong. Dump the whole exception always.
exc.printStackTrace(out);
}
return true;
}
