++to
Queue operations
Container arm for queue operation arms. The contained arms inherit a, its
sample queue.
Accepts
a is a tree.
Source
++ to
=| a=(tree) :: (qeu)
|@
Discussion
tree is the generic tree-shape mold. Maps, sets, and queues all share that
shape, but they put their elements in different places and have different
interfaces. to is the interface core for qeu; it's not generic across all
the different containers that use tree.
+apt:to
Check correctness
Test whether queue a is correctly ordered, producing a flag.
Accepts
a is a que.
Produces
A ?.
Source
++ apt
|- ^- ?
?~ a &
?& ?~(l.a & ?&((mor n.a n.l.a) $(a l.a)))
?~(r.a & ?&((mor n.a n.r.a) $(a r.a)))
==
Examples
> =bad `(qeu @ud)`[1 ~ 2 ~ 3 ~ ~]
> ~(apt to bad)
%.n> =good `(qeu @ud)`(~(gas to `(qeu @ud)`~) ~[1 2 3])
> ~(apt to good)
%.y++bal:to
Balance
Vertically rebalances queue a.
Accepts
a is a qeu.
Produces
A qeu.
Source
++ bal
|- ^+ a
?~ a ~
?. |(?=(~ l.a) (mor n.a n.l.a))
$(a l.a(r $(a a(l r.l.a))))
?. |(?=(~ r.a) (mor n.a n.r.a))
$(a r.a(l $(a a(r l.r.a))))
a
Examples
> =a `(qeu @ud)`[1 ~ 2 ~ 3 ~ ~]
> a
{1 2 3}
> `*`a
[1 0 2 0 3 0 0]
> ~(apt to a)
%.n
> =z `(qeu @ud)`~(bal to a)
> z
{1 2 3}
> `*`z
[2 [1 0 0] 3 0 0]
> ~(apt to z)
%.y++dep:to
Maximum Depth
Produces the maximum depth of leaves (r.a and l.a) in queue a.
Accepts
a is a queue.
Produces
An atom.
Source
++ dep
|- ^- @
?~ a 0
+((max $(a l.a) $(a r.a)))
Examples
> =a (~(gas to `(qeu @)`~) `(list @)`[1 2 3 4 5 6 7 ~])
> ~(dep to a)
4
> =a (~(gas to `(qeu @)`~) `(list @)`[1 2 3 4 ~])
> ~(dep to a)
3
> =a (~(gas to `(qeu @)`~) `(list @)`[1 2 ~])
> ~(dep to a)
2
> ~(dep to `(qeu tape)`["a" ~ "b" ~ "c" ~ "d" ~ "e" ~ "f" ~ "g" ~ ~])
7
> ~(dep to ~(bal to `(qeu tape)`["a" ~ "b" ~ "c" ~ "d" ~ "e" ~ "f" ~ "g" ~ ~]))
4++gas:to
Push list
Push all elements of list b into the queue a.
Accepts
a is a queue, and is the sample of +to.
b is a list.
Produces
A queue.
Source
++ gas
|= b=(list _?>(?=(^ a) n.a))
|- ^+ a
?~(b a $(b t.b, a (put i.b)))
Examples
> `(qeu)`(~(gas to `(qeu @)`~) [1 2 3 ~])
{3 2 1}
> =a (~(gas to `(qeu @)`~) [1 2 3 ~])
> =b [4 5 6 ~]
> `(qeu)`(~(gas to a) b)
{6 5 4 3 2 1}++get:to
Head-tail pair
Produces the head and tail queue of a.
Accepts
a is a queue.
Produces
A cell of the last element in a along with the rest of queue a.
Source
++ get
|- ^+ ?>(?=(^ a) [p=n.a q=*(tree _n.a)])
?~ a
!!
?~ r.a
[n.a l.a]
=+ b=$(a r.a)
:- p.b
?: |(?=(~ q.b) (mor n.a n.q.b))
a(r q.b)
a(n n.q.b, l a(r l.q.b), r r.q.b)
Examples
> =s (~(gas to *(tree @)) `(list @)`~[1 2 3])
> ~(get to s)
[n=2 l={3} r={1}]
> ~(get to ~)
! exit++nap:to
Remove head
Removes the head of queue a, producing the resulting queue.
Accepts
a is a queue.
Produces
A queue.
Source
++ nap
?> ?=(^ a)
?: =(~ l.a) r.a
=+ b=get(a l.a)
bal(n.a p.b, l.a q.b)
Examples
> =a (~(gas to `(qeu @)`~) `(list @)`[1 2 3 4 5 6 ~])
> -.a
n=6
> =b ~(nap to a)
> -.b
n=2
> a
[n=6 l={} r={5 4 3 2 1}]
> b
[n=2 l=[n=4 l={5} r={3}] r=[n=1 l={} r={}]]
> `(qeu)`b
{5 4 3 2 1}
> `(qeu)`a
{6 5 4 3 2 1}++nip:to
Removes the root of queue a, producing the resulting queue.
Accepts
a is a queue.
Produces
A queue.
Source
++ nip
|- ^+ a
?~ a ~
?~ l.a r.a
?~ r.a l.a
?: (mor n.l.a n.r.a)
l.a(r $(l.a r.l.a))
r.a(l $(r.a l.r.a))
Examples
> =a (~(gas to `(qeu @)`~) `(list @)`[1 2 3 4 5 6 ~])
> a
[n=6 l={} r={5 4 3 2 1}]
> ~(nip to a)
[n=2 l=[n=4 l={5} r={3}] r=[n=1 l={} r={}]]++put:to
Insert
Accept noun b and adds to queue a as the head, producing the
resulting queue.
Accepts
a is a queue, and is the sample of +to.
b is a noun.
Produces
A queue.
Source
++ put
|* b=*
|- ^+ a
?~ a
[b ~ ~]
bal(l.a $(a l.a))
Examples
> =a (~(gas to `(qeu @)`~) `(list @)`[3 1 2 4 5 6 ~])
> `(qeu)`(~(put to a) 7)
{7 6 5 4 2 1 3}++tap:to
Queue to list
Produces queue a as a list from front to back.
Accepts
a is a queue.
Produces
A list.
Source
++ tap
=+ b=`(list _?>(?=(^ a) n.a))`~
|- ^+ b
=+ 0 :: hack for jet match
?~ a
b
$(a r.a, b [n.a $(a l.a)])
Examples
> =a (~(gas to `(qeu @)`~) [3 1 2 4 5 6 ~])
> `*`a
[6 0 2 [4 [5 0 0] 0] 1 0 3 0 0]
> ~(tap to a)
~[3 1 2 4 5 6]++top:to
Produce head
Produces the head of queue a as a unit.
Accepts
a is a queue.
Produces
A unit.
Source
++ top
|- ^- (unit _?>(?=(^ a) n.a))
?~ a ~
?~(r.a [~ n.a] $(a r.a))
Examples
> =a (~(gas to `(qeu @)`~) `(list @)`[1 2 3 4 5 6 ~])
> ~(top to a)
[~ u=1]Discussion
An empty queue has no head.