diff options
Diffstat (limited to 'src/main/scala/Model/Action.scala')
| -rw-r--r-- | src/main/scala/Model/Action.scala | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/main/scala/Model/Action.scala b/src/main/scala/Model/Action.scala new file mode 100644 index 0000000..84704ce --- /dev/null +++ b/src/main/scala/Model/Action.scala @@ -0,0 +1,31 @@ +package o1game.Model + +/** The class `Action` represents actions that a player may take in a text adventure game. + * `Action` objects are constructed on the basis of textual commands and are, in effect, + * parsers for such commands. An action object is immutable after creation. + * @param input a textual in-game command such as “go east” or “rest” */ +class Action(input: String): + + private val commandText = input.trim.toLowerCase + private val verb = commandText.takeWhile( _ != ' ' ) + private val modifiers = commandText.drop(verb.length).trim + + /** Causes the given player to take the action represented by this object, assuming + * that the command was understood. Returns a description of what happened as a result + * of the action (such as “You go west.”). The description is returned in an `Option` + * wrapper; if the command was not recognized, `None` is returned. */ + def execute(actor: Entity): Option[String] = + this.verb match + case "go" => Some(actor.go(this.modifiers)) + case "rest" => Some(actor.rest()) + case "get" => Some(actor.pickUp(this.modifiers)) + case "drop" => Some(actor.drop(this.modifiers)) + case "xyzzy" => Some("The grue tastes yummy.") + case "quit" => Some(actor.quit()) + case other => None + + /** Returns a textual description of the action object, for debugging purposes. */ + override def toString = s"$verb (modifiers: $modifiers)" + +end Action + |