Refactor parser for some added flexibility.

terms/Term.ts

@@ -0,0 +1,34 @@
+import Player from "../Player.ts";
+import Scene from "../Scene.ts";
+
+export type ActionFn = (
+	player: Player,
+	scene: Scene,
+	target?: string,
+	object?: string
+) => string;
+
+export interface Constant {
+	constant: string;
+	category: Category;
+}
+
+export type Category =
+	| "action"
+	| "direction"
+	| "compound"
+	| "position"
+	| "interaction";
+
+export interface Term {
+	precedesCategories: Category[];
+	precedesConstants: Constant[];
+	category: Category;
+	constant: string;
+	canPrecedeVariable: boolean;
+}
+
+export interface Action extends Term {
+	action: ActionFn;
+	category: "action";
+}