!747

!multi-line strings

m {

  !include #1001509 // rules & statements

  p {

    rules.add([["$1 is the singular of $2." <=> "$2 is the plural of $1."]]);

    statements.add("house is the singular of houses.");

    process();

    print(fromLines(statements));

    ask([[how many plurals does "house" have?]]);

    ask([[what are the plurals of "house"?]]);

  }

  static void ask(S q) {

    print("? " + q);

    new Map<S, S> map;

    if (match4("how many plurals does $1 have?", q, map))

      print("  => " + getPlurals(map.get("$1")).size());

    else if (match4("what are the plurals of $1?", q, map))

      print("  => " + structure(getPlurals(map.get("$1"))));

    else

      print("dunno.");

  }

  static L<S> getPlurals(S x) {

    S c = "$2 is the plural of " + x;

    print("[" + c + "]");

    MultiMap<S, S> matches = matchAll(c);

    ret matches.get("$2");

  }

}