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package bjc.dicelang.neodice.commands;
import java.util.*;
import java.util.function.*;
import bjc.dicelang.neodice.*;
import bjc.dicelang.neodice.statements.*;
/**
* A single CLI command.
*
* @author Ben Culkin
*
*/
@FunctionalInterface
public interface Command {
/**
* Execute this command.
*
* @param words The remaining input.
* @param state The current state.
*
* @return The result of executing this command.
*/
public StatementValue execute(Iterator<String> words, DieBoxCLI state);
/**
* Get the 'short help' or usage summary for this command.
*
* @return The short help for this command.
*/
default String shortHelp() {
return "no short help";
}
/**
* Get the 'long help' or detailed usage for this command.
*
* @return The long help for this command.
*/
default String longHelp() {
return "no long help";
}
/**
* Create a new command, backed by a function.
*
* @param executor The function which backs the command.
* @param shortHelp The short help string.
* @param longHelp The long help string.
*
* @return A command backed by the function, with help.
*/
static Command newCommand(
BiFunction<Iterator<String>, DieBoxCLI, StatementValue> executor,
String shortHelp, String longHelp) {
return new FunctionalCommand(executor, shortHelp, longHelp);
}
}
class FunctionalCommand implements Command {
private final BiFunction<Iterator<String>, DieBoxCLI, StatementValue> executor;
private final String shortHelp;
private final String longHelp;
public FunctionalCommand(
BiFunction<Iterator<String>, DieBoxCLI, StatementValue> executor, String shortHelp,
String longHelp) {
this.executor = executor;
this.shortHelp = shortHelp;
this.longHelp = longHelp;
}
@Override
public StatementValue execute(Iterator<String> words, DieBoxCLI state) {
return executor.apply(words, state);
}
@Override
public String shortHelp() {
return shortHelp;
}
@Override
public String longHelp() {
return longHelp;
}
}
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