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package bjc.dicelang.neodice.commands;
import static bjc.dicelang.neodice.statements.StatementValue.Type.*;
import java.util.*;
import bjc.dicelang.neodice.*;
import bjc.dicelang.neodice.statements.*;
/**
* A command that rolls a die or die-pool.
*
* @author Ben Culkin
*
*/
public class RollCommand implements Command {
@Override
public StatementValue execute(Iterator<String> words, DieBoxCLI state) {
if (!words.hasNext()) {
throw new DieBoxException("Roll must be provided an argument to roll");
} else {
StatementValue toRoll = state.runStatement(words);
if (toRoll.type == DIE) {
DieStatementValue die = (DieStatementValue) toRoll;
return die.value.roll(state.rng);
} else if (toRoll.type == DIEPOOL) {
DiePoolStatementValue pool = (DiePoolStatementValue) toRoll;
StatementValue[] values = pool.value
.roll(state.rng)
.toArray((sz) -> new StatementValue[sz]);
return new ArrayStatementValue<>(pool.elementType,
values);
} else {
throw new DieBoxException("Roll was provided something that wasn't rollable (only DIE and DIEPOOL objects are rollable) (was %s, of type %s)",
toRoll, toRoll.type);
}
}
}
@Override
public String shortHelp() {
return "rolls a die-like object";
}
@Override
public String longHelp() {
return "Rolls a die-like object, and yields the result of rolling it."
+ " What is returned can differ based on what is rolled";
}
}
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