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package bjc.utils.cli.fds;
import java.io.PrintStream;
import bjc.utils.ioutils.Block;
import bjc.utils.ioutils.BlockReader;
/**
* Runs a FDS (FDiskScript) interface.
*
* This is a rudimentary console interface inspired heavily by FDisk's interface
* style.
*
* Commands are denoted by a single character, but can invoke submodes.
*
* @author bjculkin
*
*/
public class FDS {
/**
* Run a provided FDS mode until it is exited or there is no more input.
*
* @param blockSource
* The command input source for the FDS mode.
*
* @param datain
* The data input source for the FDS mode.
*
* @param printer
* The output source for the FDS mode.
*
* @param mode
* The mode to start in.
*
* @param state
* The initial state for the mode.
*
* @return The final state of the mode.
*
* @throws FDSException
* If something went wrong during mode execution.
*/
public static <S> S runFDS(BlockReader blockSource, BlockReader datain, PrintStream printer, FDSMode<S> mode,
FDSState<S> state) throws FDSException {
//printer.print("Enter a command (m for help): ");
while (blockSource.hasNext()) {
Block comBlock = blockSource.next();
handleCommandString(comBlock, blockSource, datain, printer, mode, state);
//printer.print("Enter a command (m for help): ");
}
return state.state;
}
private static <S> void handleCommandString(Block comBlock, BlockReader blockSource, BlockReader datain,
PrintStream printer, FDSMode<S> mode, FDSState<S> state) throws FDSException {
String comString = comBlock.contents.trim();
switch (state.mode) {
case CHORD:
if (comString.length() > 1) {
for (char c : comString.substring(1).toCharArray()) {
Block newCom = new Block(comBlock.blockNo + 1, Character.toString(c),
comBlock.startLine, comBlock.startLine);
state.enqueCommand.accept(newCom);
}
}
case NORMAL:
handleCommand(comString.charAt(0), blockSource, datain, printer, mode, state);
break;
default:
throw new FDSException(String.format("Unknown input mode '%s'", state.mode));
}
}
private static <S> void handleCommand(char charAt, BlockReader blockSource, BlockReader datain,
PrintStream printer, FDSMode<S> mode, FDSState<S> state) {
printer.printf("Recieved command '%s'\n", charAt);
}
}
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