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(.module: {#.doc "Composable extensions to the piping macros (|> and <|) that enhance them with various abilities."}
[library
[lux #*
[abstract
[monad (#+ do)]]
[control
["e" try]
["p" parser
["s" code (#+ Parser)]]]
[data
["." identity]
[collection
["." list ("#\." fold monad)]]]
[macro (#+ with_gensyms)
[syntax (#+ syntax:)]
["." code]]
[math
[number
["n" nat]
["i" int]]]]])
(def: body^
(Parser (List Code))
(s.tuple (p.some s.any)))
(syntax: #export (new> start
{body body^}
prev)
{#.doc (doc "Ignores the piped argument, and begins a new pipe."
(n.= 1
(|> 20
(n.* 3)
(n.+ 4)
(new> 0 [inc]))))}
(wrap (list (` (|> (~ start) (~+ body))))))
(syntax: #export (let> binding body prev)
{#.doc (doc "Gives a name to the piped-argument, within the given expression."
(n.= 10
(|> 5
(let> x (n.+ x x)))))}
(wrap (list (` (let [(~ binding) (~ prev)]
(~ body))))))
(def: _reverse_
(Parser Any)
(function (_ tokens)
(#e.Success [(list.reverse tokens) []])))
(syntax: #export (cond> {_ _reverse_}
prev
{else body^}
{_ _reverse_}
{branches (p.some (p.and body^ body^))})
{#.doc (doc "Branching for pipes."
"Both the tests and the bodies are piped-code, and must be given inside a tuple."
(|> +5
(cond> [i.even?] [(i.* +2)]
[i.odd?] [(i.* +3)]
[(new> -1 [])])))}
(with_gensyms [g!temp]
(wrap (list (` (let [(~ g!temp) (~ prev)]
(cond (~+ (do list.monad
[[test then] branches]
(list (` (|> (~ g!temp) (~+ test)))
(` (|> (~ g!temp) (~+ then))))))
(|> (~ g!temp) (~+ else)))))))))
(syntax: #export (if> {test body^} {then body^} {else body^} prev)
(wrap (list (` (cond> [(~+ test)] [(~+ then)]
[(~+ else)]
(~ prev))))))
(syntax: #export (when> {test body^} {then body^} prev)
(wrap (list (` (cond> [(~+ test)] [(~+ then)]
[]
(~ prev))))))
(syntax: #export (loop> {test body^}
{then body^}
prev)
{#.doc (doc "Loops for pipes."
"Both the testing and calculating steps are pipes and must be given inside tuples."
(|> +1
(loop> [(i.< +10)]
[inc])))}
(with_gensyms [g!temp]
(wrap (list (` (loop [(~ g!temp) (~ prev)]
(if (|> (~ g!temp) (~+ test))
((~' recur) (|> (~ g!temp) (~+ then)))
(~ g!temp))))))))
(syntax: #export (do> monad
{steps (p.some body^)}
prev)
{#.doc (doc "Monadic pipes."
"Each steps in the monadic computation is a pipe and must be given inside a tuple."
(|> +5
(do> identity.monad
[(i.* +3)]
[(i.+ +4)]
[inc])))}
(with_gensyms [g!temp]
(case (list.reverse steps)
(^ (list& last_step prev_steps))
(let [step_bindings (do list.monad
[step (list.reverse prev_steps)]
(list g!temp (` (|> (~ g!temp) (~+ step)))))]
(wrap (list (` ((~! do) (~ monad)
[(~' #let) [(~ g!temp) (~ prev)]
(~+ step_bindings)]
(|> (~ g!temp) (~+ last_step)))))))
_
(wrap (list prev)))))
(syntax: #export (exec> {body body^}
prev)
{#.doc (doc "Non-updating pipes."
"Will generate piped computations, but their results will not be used in the larger scope."
(|> +5
(exec> [.nat %n log!])
(i.* +10)))}
(with_gensyms [g!temp]
(wrap (list (` (let [(~ g!temp) (~ prev)]
(exec (|> (~ g!temp) (~+ body))
(~ g!temp))))))))
(syntax: #export (tuple> {paths (p.many body^)}
prev)
{#.doc (doc "Parallel branching for pipes."
"Allows to run multiple pipelines for a value and gives you a tuple of the outputs."
(|> +5
(tuple> [(i.* +10)]
[dec (i./ +2)]
[Int/encode]))
"Will become: [+50 +2 '+5']")}
(with_gensyms [g!temp]
(wrap (list (` (let [(~ g!temp) (~ prev)]
[(~+ (list\map (function (_ body) (` (|> (~ g!temp) (~+ body))))
paths))]))))))
(syntax: #export (case> {branches (p.many (p.and s.any s.any))}
prev)
{#.doc (doc "Pattern-matching for pipes."
"The bodies of each branch are NOT pipes; just regular values."
(|> +5
(case> +0 "zero"
+1 "one"
+2 "two"
+3 "three"
+4 "four"
+5 "five"
+6 "six"
+7 "seven"
+8 "eight"
+9 "nine"
_ "???")))}
(wrap (list (` (case (~ prev)
(~+ (list\join (list\map (function (_ [pattern body]) (list pattern body))
branches))))))))
|
