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|
(.module:
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do)]
[equivalence (#+ Equivalence)]
{[0 #test]
[/
["$." functor (#+ Injection Comparison)]
["$." apply]
["$." monad]]}]
[control
[parser
["s" code (#+ Parser)]]]
[data
["." error (#+ Error)]
[number
["." nat]]
["." text ("#;." equivalence)
format]
[collection
["." list ("#;." functor)]]]
[math
["r" random]]
[macro
["." code]
[syntax (#+ syntax:)]]]
{1
["." / (#+ Parser)]})
(def: (should-fail expected input)
(All [a] (-> Text (Error a) Bit))
(case input
(#error.Failure actual)
(text;= expected actual)
_
#0))
(def: (enforced? parser input)
(All [s] (-> (Parser s Any) s Bit))
(case (/.run input parser)
(#error.Success [_ []])
#1
_
#0))
(def: (found? parser input)
(All [s] (-> (Parser s Bit) s Bit))
(case (/.run input parser)
(#error.Success [_ #1])
#1
_
#0))
(def: (fails? input)
(All [a] (-> (Error a) Bit))
(case input
(#error.Failure _)
#1
_
#0))
(syntax: (match pattern then input)
(wrap (list (` (case (~ input)
(^ (#error.Success [(~' _) (~ pattern)]))
(~ then)
(~' _)
#0)))))
(def: combinators-0
Test
(do r.monad
[expected0 r.nat
variadic (:: @ map (|>> (n/max 1) (n/min 20)) r.nat)
expected+ (r.list variadic r.nat)
even0 (r.filter n/even? r.nat)
odd0 (r.filter n/odd? r.nat)
not0 r.bit]
($_ _.and
(_.test "Can optionally succeed with some parser."
(and (|> (/.maybe s.nat)
(/.run (list (code.nat expected0)))
(match (#.Some actual)
(n/= expected0 actual)))
(|> (/.maybe s.nat)
(/.run (list (code.int (.int expected0))))
(match #.None
#1))))
(_.test "Can apply a parser 0 or more times."
(and (|> (/.some s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) = expected+ actual)))
(|> (/.some s.nat)
(/.run (list;map (|>> .int code.int) expected+))
(match #.Nil
#1))))
(_.test "Can apply a parser 1 or more times."
(and (|> (/.many s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) = expected+ actual)))
(|> (/.many s.nat)
(/.run (list (code.nat expected0)))
(match (list actual)
(n/= expected0 actual)))
(|> (/.many s.nat)
(/.run (list;map (|>> .int code.int) expected+))
fails?)))
(_.test "Can use either parser."
(let [even (/.filter n/even? s.nat)
odd (/.filter n/odd? s.nat)]
(and (|> (/.either even odd)
(/.run (list (code.nat even0)))
(match actual (n/= even0 actual)))
(|> (/.either even odd)
(/.run (list (code.nat odd0)))
(match actual (n/= odd0 actual)))
(|> (/.either even odd)
(/.run (list (code.bit not0)))
fails?))))
(_.test "Can create the opposite/negation of any parser."
(and (|> (/.not s.nat)
(/.run (list (code.nat expected0)))
fails?)
(|> (/.not s.nat)
(/.run (list (code.bit not0)))
(match [] #1))))
)))
(def: combinators-1
Test
(do r.monad
[failure (r.ascii 1)
variadic (:: @ map (|>> (n/max 1) (n/min 20)) r.nat)
times (:: @ map (n/% variadic) r.nat)
expected+ (r.list variadic r.nat)
separator (r.ascii 1)]
($_ _.and
(_.test "Can fail at will."
(|> (/.fail failure)
(/.run (list))
(should-fail failure)))
(_.test "Can apply a parser N times."
(and (|> (/.exactly times s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) =
(list.take times expected+)
actual)))
(|> (/.exactly (inc variadic) s.nat)
(/.run (list;map code.nat expected+))
fails?)))
(_.test "Can apply a parser at-least N times."
(and (|> (/.at-least times s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) =
expected+
actual)))
(|> (/.at-least (inc variadic) s.nat)
(/.run (list;map code.nat expected+))
fails?)))
(_.test "Can apply a parser at-most N times."
(and (|> (/.at-most times s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) =
(list.take times expected+)
actual)))
(|> (/.at-most (inc variadic) s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) =
expected+
actual)))))
(_.test "Can apply a parser between N and M times."
(and (|> (/.between times variadic s.nat)
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence nat.equivalence) =
expected+
actual)))
(|> (/.between times variadic s.nat)
(/.run (list;map code.nat (list.take times expected+)))
(match actual
(:: (list.equivalence nat.equivalence) =
(list.take times expected+)
actual)))))
(_.test "Can parse while taking separators into account."
(|> (/.sep-by (s.this (code.text separator)) s.nat)
(/.run (list.interpose (code.text separator) (list;map code.nat expected+)))
(match actual
(:: (list.equivalence nat.equivalence) =
expected+
actual))))
(_.test "Can obtain the whole of the remaining input."
(|> /.remaining
(/.run (list;map code.nat expected+))
(match actual
(:: (list.equivalence code.equivalence) =
(list;map code.nat expected+)
actual))))
)))
(def: (injection value)
(Injection (All [a i] (Parser i a)))
(:: /.monad wrap value))
(def: comparison
(Comparison (All [a i] (Parser i a)))
(function (_ == left right)
(case [(/.run [] left) (/.run [] right)]
[(#error.Success [_ left]) (#error.Success [_ right])]
(== left right)
_
false)))
(def: #export test
Test
(do r.monad
[assertion (r.ascii 1)]
(<| (_.context (%name (name-of /.Parser)))
($_ _.and
($functor.spec ..injection ..comparison /.functor)
($apply.spec ..injection ..comparison /.apply)
($monad.spec ..injection ..comparison /.monad)
(_.test "Can make assertions while parsing."
(and (|> (/.assert assertion #1)
(/.run (list (code.bit #1) (code.int +123)))
(match [] #1))
(|> (/.assert assertion #0)
(/.run (list (code.bit #1) (code.int +123)))
fails?)))
..combinators-0
..combinators-1
))))
|
