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(local insert table.insert)
(local _unpack (or table.unpack unpack))
(import-macros {: fn*} :macros.fn)
(import-macros {: when-some} :macros.core)
(fn seq [tbl]
"Create sequential table.
Transforms original table to sequential table of key value pairs
stored as sequential tables in linear time. If `tbl' is an
associative table, returns `[[key1 value1] ... [keyN valueN]]' table.
If `tbl' is sequential table, leaves it unchanged."
(var assoc? false)
(let [res []]
(each [k v (pairs tbl)]
(if (and (not assoc?)
(not (= (type k) "number")))
(set assoc? true))
(insert res [k v]))
(if assoc? res tbl)))
(fn first [itbl]
"Return first element of an indexed table."
(. (seq itbl) 1))
(fn rest [itbl]
"Returns table of all elements of indexed table but the first one."
[(_unpack (seq itbl) 2)])
(fn* conj
"Insert `x' as a last element of indexed table `itbl'. Modifies `itbl'"
([] [])
([itbl] itbl)
([itbl x] (when-some [x x]
(doto itbl (insert x))))
([itbl x & xs]
(if (> (length xs) 0)
(let [[y & xs] xs] (conj (conj itbl x) y (_unpack xs)))
(conj itbl x))))
(fn* consj
"Like conj but joins at the front. Modifies `itbl'."
([] [])
([itbl] itbl)
([itbl x] (when-some [x x]
(doto itbl (insert 1 x))))
([itbl x & xs]
(if (> (length xs) 0)
(let [[y & xs] xs] (consj (consj itbl x) y (_unpack xs)))
(consj itbl x))))
(fn cons [x itbl]
"Insert `x' to `itbl' at the front. Modifies `itbl'."
(when-some [x x]
(doto (or itbl [])
(insert 1 x))))
(fn* reduce
"Reduce indexed table using function `f' and optional initial value `val'.
([f table])
([f val table])
`f' should be a function of 2 arguments. If val is not supplied,
returns the result of applying f to the first 2 items in coll, then
applying f to that result and the 3rd item, etc. If coll contains no
items, f must accept no arguments as well, and reduce returns the
result of calling f with no arguments. If coll has only 1 item, it is
returned and f is not called. If val is supplied, returns the result
of applying f to val and the first item in coll, then applying f to
that result and the 2nd item, etc. If coll contains no items, returns
val and f is not called."
([f itbl]
(let [itbl (seq itbl)]
(match (length itbl)
0 (f)
1 (. itbl 1)
2 (f (. itbl 1) (. itbl 2))
_ (let [[a b & rest] itbl]
(reduce f (f a b) rest)))))
([f val [x & xs]]
(if (not (= x nil))
(reduce f (f val x) xs)
val)))
(fn* reduce-kv
"Reduces an associative table using function `f' and initial value `val'.
([f val table])
`f' should be a function of 3 arguments. Returns the result of
applying `f' to `val', the first key and the first value in coll, then
applying `f' to that result and the 2nd key and value, etc. If coll
contains no entries, returns `val' and `f' is not called. Note that
reduce-kv is supported on vectors, where the keys will be the
ordinals." [f val kvtbl]
(var res val)
(each [_ [k v] (pairs (seq kvtbl))]
(set res (f res k v)))
res)
(fn* mapv
"Maps function `f' over one or more tables.
Accepts arbitrary amount of tables, calls `seq' on each of it.
Function `f' must take the same amount of parameters as the amount of
tables passed to `mapv'. Applies `f' over first value of each
table. Then applies `f' to second value of each table. Continues until
any of the tables is exhausted. All remaining values are
ignored. Returns a table of results."
([f itbl]
(local res [])
(each [_ v (ipairs (seq itbl))]
(when-some [tmp (f v)]
(insert res tmp)))
res)
([f t1 t2]
(let [res []
t1 (seq t1)
t2 (seq t2)]
(var (i1 v1) (next t1))
(var (i2 v2) (next t2))
(while (and i1 i2)
(when-some [tmp (f v1 v2)]
(insert res tmp))
(set (i1 v1) (next t1 i1))
(set (i2 v2) (next t2 i2)))
res))
([f t1 t2 t3]
(let [res []
t1 (seq t1)
t2 (seq t2)
t3 (seq t3)]
(var (i1 v1) (next t1))
(var (i2 v2) (next t2))
(var (i3 v3) (next t3))
(while (and i1 i2 i3)
(when-some [tmp (f v1 v2 v3)]
(insert res tmp))
(set (i1 v1) (next t1 i1))
(set (i2 v2) (next t2 i2))
(set (i3 v3) (next t3 i3)))
res))
([f t1 t2 t3 & tbls]
(let [step (fn step [tbls]
(when (->> tbls
(mapv #(~= (next $) nil))
(reduce #(and $1 $2)))
(cons (mapv #(first (seq $)) tbls) (step (mapv rest tbls)))))
res []]
(each [_ v (ipairs (step (consj tbls t3 t2 t1)))]
(when-some [tmp (f (_unpack v))]
(insert res tmp)))
res)))
(fn kvseq [kvtbl]
(let [res []]
(each [k v (pairs kvtbl)]
(insert res [k v]))
res))
(fn* eq?
"Deep compare values."
([x] true)
([x y]
(if (and (= (type x) "table") (= (type y) "table"))
(and (reduce #(and $1 $2) true (mapv (fn [[k v]] (eq? (. y k) v)) (kvseq x)))
(reduce #(and $1 $2) true (mapv (fn [[k v]] (eq? (. x k) v)) (kvseq y))))
(= x y)))
([x y & xs]
(reduce #(and $1 $2) (eq? x y) (mapv #(eq? x $) xs))))
;;;;;;;;;; fn stuff ;;;;;;;;
(fn identity [x] x)
(fn* comp
([] identity)
([f] f)
([f g]
(fn*
([] (f (g)))
([x] (f (g x)))
([x y] (f (g x y)))
([x y z] (f (g x y z)))
([x y z & args] (f g x y z (_unpack args)))))
([f g & fs]
(reduce comp (conj [f g] (_unpack fs)))))
(fn* every?
[pred itbl]
(if (= 0 (length itbl)) true
(pred (first itbl)) (every? pred (rest itbl))
false))
;; (fn* some
;; [pred itbl]
;; (if (> (length itbl) 0)
;; ))
(fn* range
"return range of of numbers from `lower' to `upper' with optional `step'."
([upper] (range 0 upper 1))
([lower upper] (range lower upper 1))
([lower upper step]
(let [res []]
(for [i lower (- upper step) step]
(insert res i))
res)))
{: seq
: mapv
: reduce
: reduce-kv
: conj
: cons
: first
: rest
: eq?
: identity
: comp
: every?
: range}
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