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package bjc.utils.cli.fds;
import static bjc.utils.ioutils.BlockReaders.pushback;
import static bjc.utils.ioutils.BlockReaders.simple;
import static bjc.utils.ioutils.BlockReaders.trigger;
import java.io.PrintStream;
import java.io.Reader;
import bjc.utils.cli.fds.FDSState.InputMode;
import bjc.utils.ioutils.BlockReader;
import bjc.utils.ioutils.Prompter;
import bjc.utils.ioutils.PushbackBlockReader;
/**
* Utilities for dealing with FDS
*
* @author bjculkin
*
*/
public class FDSUtils {
/**
* Run a FDS instance from a reader.
*
* @param reader
* The reader to use.
*
* @param out
* The output stream to use.
*
* @param mode
* The mode to use.
*
* @param ctx
* The initial state.
*
* @return The final state.
*
* @throws FDSException
* If something goes wrong.
*/
public static <S> S runFromReader(Reader reader, PrintStream out, FDSMode<S> mode, S ctx) throws FDSException {
BlockReader input = simple("\\R", reader);
Prompter comPrompter = new Prompter("Enter a command (m for help): ", out);
Prompter dataPrompter = new Prompter("> ", out);
BlockReader rawComInput = trigger(input, comPrompter);
BlockReader rawDataInput = trigger(input, dataPrompter);
PushbackBlockReader comInput = pushback(rawComInput);
PushbackBlockReader dataInput = pushback(rawDataInput);
FDSState<S> fdsState = new FDSState<>(ctx, InputMode.INLINE, comInput, dataInput, out);
fdsState.modes.push(mode);
FDS.runFDS(fdsState);
return ctx;
}
}
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