?(?-) (Utils)

<> (print ?x) (?(?: ?:) ?x)

?(?-) (Sight)

<> (print-sentence (?q ?r)) (?(?: ?:) ?q\s print-sentence ?r)
<> (print-sentence ()) (?(?: ?:) \n)

<> (print-list ?a ((:?x ?X) ((:?y ?Y) ((:?z ?Z) ?r)))) (print (You ?a a ?x, a ?y and a ?z.\n))
<> (print-list ?a ((:?x ?X) ((:?y ?Y) ()))) (print (You ?a a ?x and a ?y.\n))
<> (print-list ?a ((:?x ?X) ())) (print (You ?a a ?x.\n))
<> (print-list ?a ()) ()
<> print-prompt (?(?: ?:) (\n|\s))

<> (:?p ((sight > $ :?V ?C) ?r)) (
	print (\nYou are a ?V in a ?p.\n)
	print-list see ?r
	print-list carry ?C
	print-note
	:?p print-prompt ((> $ :?V ?C) ?r)
)

?(?-) (Cleanup articles)

<> ((note ?q) remove-articles parse) ((note ?q) parse-special)
<> ((?x ?r) remove-articles) (clean ?r (?x ()))

<> (clean (the ?r) ?q) (clean ?r ?q)
<> (clean (a ?r) ?q) (clean ?r ?q)
<> (clean (an ?r) ?q) (clean ?r ?q)

<> (clean (?w ?r) ?q) (clean ?r (?w ?q))
<> (clean () ?q) (flip () ?q)
<> (flip ?q (?w ?r)) (flip (?w ?q) ?r)
<> (flip ?q ()) ?q

?(?-) (Join words)

<> ((?v (?a (?b ()))) parse) ((?v (?a\s?b ())) parse)
<> ((?v (?a (?b (in ?r)))) parse) ((?v (?a\s?b (in ?r))) parse)
<> ((?v (?a (in (?b (?c ()))))) parse) ((?v (?a (in (?b\s?c ())))) parse)

?(?-) (Physics)

<> ((-> ?q :?q ?c)) ((<- ?q :?q ?c))
<> ((-> ?q :?V ?C) ((:?v ?c) ?r)) ((:?V ?C) ((-> ?q :?v ?c) ?r))
<> ((-> ?q :?V ?C) ()) ((<- ?q :?V ?C) ())
<> ((:?V ?C) ((<- ?q :?q ?c) ?r)) ((<- ?q :?q ?c) ((:?V ?C) ?r))
<> ((:?V ?C) ((<- ?q :?v ?c) ?r)) ((<- ?q :?v ?c) ((:?V ?C) ?r))

?(?-) (Create)

<> (((create (?q ())) parse sight > $ :?V ?C) ?r) (
	print (You created a ?q.\n)
	(sight > $ :?V ?C) ((:?q ()) ?r)
)

?(?-) (Become)

<> (((become (?q ())) parse sight > $ :?V ?C) ()) (
	print (You don't see any vessels.\n)
	(sight > $ :?V ?C) ()
)

<> (((become (?q ())) parse sight > $ :?V ?C) ((:?v ?c) ?r)) (
	((become ?q) wait :?V ?C) ((-> ?q :?v ?c) ?r)
)

<> (((become ?v) wait :?V ?C) ((<- ?v :?v ?c) ?r)) (
	print (You became the ?v.\n)
	(sight > $ :?v ?c) ((:?V ?C) ?r)
)

<> (((become ?q) wait :?V ?C) ((<- ?q :?v ?c) ?r)) (
	print (You don't see a ?q.\n)
	(sight > $ :?V ?C) ((:?v ?c) ?r)
)

?(?-) (Enter)

<> (((enter (?q ())) parse sight > $ :?V ?C) ()) (
	print (You don't see any vessels.\n)
	(sight > $ :?V ?C) ()
)

<> (((enter (?q ())) parse sight > $ :?V ?C) ((:?v ?c) ?r)) (
	((enter ?q) wait :?V ?C) ((-> ?q :?v ?c) ?r)
)

<> (((enter ?v) wait :?V ?C) ((<- ?v :?v ?c) ?r)) (
	print (You entered the ?v.\n)
	((:?v ((sight > $ :?V ?C) ?c)) ?r)
)

<> (((enter ?q) wait :?V ?C) ((<- ?q :?v ?c) ?r)) (
	print (You don't see a ?q.\n)
	(sight > $ :?V ?C) ((:?v ?c) ?r)
)

?(?-) (Leave)

<> (((:?p (((leave ()) parse sight > $ :?V ?C) ?r)) ?a)) (
	print (You left the ?p.\n)
	(sight > $ :?V ?C) ((:?p ?r) ?a)
)

<> ((leave ?q) parse) (
	print (You cannot leave.\n)
)

?(?-) (Take)

<> (((take (?q ())) parse sight > $ :?V ?C) ()) (
	print (You don't see any vessels.\n)
	(sight > $ :?V ?C) ()
)

<> (((take (?q ())) parse sight > $ :?V ?C) ((:?v ?c) ?r)) (
	((take ?q) wait :?V ?C) ((-> ?q :?v ?c) ?r)
)

<> (((take ?v) wait :?V ?C) ((<- ?v :?v ?c) ?r)) (
	print (You took the ?v.\n)
	(sight > $ :?V ((:?v ?c) ?C)) ?r
)

<> (((take ?q) wait :?V ?C) ((<- ?q :?v ?c) ?r)) (
	print (You don't see a ?q.\n)
	(sight > $ :?V ?C) ((:?v ?c) ?r)
)

?(?-) (Drop)

<> (((drop (?q ())) parse sight > $ :?V ())) (
	print (You don't carry any vessels.\n)
	(sight > $ :?V ())
)

<> (((drop (?q ())) parse sight > $ :?V ((:?v ?c) ?C))) (
	((drop ?q) wait :?V ((-> ?q :?v ?c) ?C))
)

<> (((drop ?v) wait :?V ((<- ?v :?v ?c) ?C)) ?r) (
	print (You dropped the ?v.\n)
	(sight > $ :?V ?C) ((:?v ?c) ?r)
)

<> (((drop ?q) wait :?V ((<- ?q :?v ?c) ?C)) ?r) (
	print (You don't carry a ?q.\n)
	(sight > $ :?V ((:?v ?c) ?C)) ?r
)

?(?-) (Move)

<> (((move ?a ?b) wait :?V ?C) ((<- ?a :?a ?c) ((:?b ?d) ?r))) (
	print (You moved the ?a in the ?b.\n)
	(sight > $ :?V ?C) ((:?b ((:?a ?c) ?d)) ?r)
)

<> (((move ?a ?b) wait :?V ?C) ((<- ?b :?b ?c) ?r)) (
	((move ?a ?b) wait :?V ?C) ((-> ?a :?b ?c) ?r)
)

<> (((move ?a ?b) wait :?V ?C) ((<- ?b :?B ?c) ?r)) (
	print (You don't see a ?b.\n)
	(sight > $ :?V ?C) ((:?B ?c) ?r)
)

<> (((move ?a ?b) wait :?V ?C) ((<- ?a :?B ?c) ?r)) (
	print (You don't see a ?a.\n)
	(sight > $ :?V ?C) ((:?B ?c) ?r)
)

<> (((move (?a (in (?b ())))) parse sight > $ :?V ?C) ((:?v ?c) ?r)) (
	((move ?a ?b) wait :?V ?C) ((-> ?b :?v ?c) ?r)
)

?(?-) (Transform)

<> ((transform (?q ())) parse sight > $ :?V) (
	print (You transformed into a ?q.\n)
	sight > $ :?q
)

?(?-) (Note)

<> (:?p (((note ?n) parse-special sight > $ :?V ?C) ?r)) (
	>< (print-note :?p)
	>< (print-note)
	<> (print-note :?p) (print-sentence ?n :?p)
	<> (print-note) ()
	:?p ((sight > $ :?V ?C) ?r)
)

<> ((quit ?q) parse sight > $) (
	?(?: ?:) (You fell asleep.\n)
)

?(?-) (Input loop)

<> (() parse) ()
<> ((?x ?q) parse) (print (Unknown action: ?x \n))
<> (() input) ()
<> (?x input) (
	?(?: ?:) \n 
	?(?* ((?*))) ?x remove-articles parse
)
<> (?~ $ :?V) (
	(?~) input sight > $ :?V
)

(:library ((sight > $ :ghost ()) ((:haunted\shouse ((:teapot ((:moth ()) ())) ())) ())))