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|
(.require
[library
[lux (.except case let if)
[abstract
["[0]" monad (.only do)]]
[data
["[0]" product]
["[0]" text (.only)
["%" \\format (.only format)]]
[collection
["[0]" list (.use "[1]#[0]" functor mix)]
["[0]" set]]]
[math
[number
["i" int]]]
[meta
[macro
["^" pattern]
["[0]" template]]
[target
["_" scheme (.only Expression Computation Var)]]]]]
["[0]" //
["[1][0]" runtime (.only Operation Phase Generator)]
["[1][0]" reference]
["[1][0]" primitive]
["/[1]" //
["[1][0]" reference]
["/[1]" //
["[1][0]" synthesis
["[1]/[0]" case]]
["/[1]" //
["[1][0]" synthesis (.only Member Synthesis Path)]
["[1][0]" generation]
["//[1]" ///
[reference
["[1][0]" variable (.only Register)]]
["[1][0]" phase (.use "[1]#[0]" monad)]
[meta
[archive (.only Archive)]]]]]]])
(def .public register
(-> Register Var)
(|>> (///reference.local //reference.system) as_expected))
(def .public capture
(-> Register Var)
(|>> (///reference.foreign //reference.system) as_expected))
(def .public (let expression archive [valueS register bodyS])
(Generator [Synthesis Register Synthesis])
(do ///////phase.monad
[valueO (expression archive valueS)
bodyO (expression archive bodyS)]
(in (_.let (list [(..register register) valueO])
bodyO))))
(def .public (if expression archive [testS thenS elseS])
(Generator [Synthesis Synthesis Synthesis])
(do ///////phase.monad
[testO (expression archive testS)
thenO (expression archive thenS)
elseO (expression archive elseS)]
(in (_.if testO thenO elseO))))
(def .public (get expression archive [pathP valueS])
(Generator [(List Member) Synthesis])
(do ///////phase.monad
[valueO (expression archive valueS)]
(in (list#mix (function (_ side source)
(.let [method (.case side
(^.with_template [<side> <accessor>]
[(<side> lefts)
(<accessor> (_.int (.int lefts)))])
([.#Left //runtime.tuple//left]
[.#Right //runtime.tuple//right]))]
(method source)))
valueO
(list.reversed pathP)))))
(def @savepoint (_.var "lux_pm_cursor_savepoint"))
(def @cursor (_.var "lux_pm_cursor"))
(def @temp (_.var "lux_pm_temp"))
(def @alt_error (_.var "alt_error"))
(def (push! value var)
(-> Expression Var Computation)
(_.set! var (_.cons/2 value var)))
(def (push_cursor! value)
(-> Expression Computation)
(push! value @cursor))
(def (pop! var)
(-> Var Computation)
(_.set! var (_.cdr/1 var)))
(def save_cursor!
Computation
(push! @cursor @savepoint))
(def restore_cursor!
Computation
(_.begin (list (_.set! @cursor (_.car/1 @savepoint))
(_.set! @savepoint (_.cdr/1 @savepoint)))))
(def peek
Computation
(_.car/1 @cursor))
(def pop_cursor!
Computation
(pop! @cursor))
(def pm_error
(_.string (template.with_locals [pm_error]
(template.text [pm_error]))))
(def fail!
(_.raise/1 pm_error))
(def (try_pm on_failure happy_path)
(-> Expression Expression Computation)
(_.guard @alt_error
(list [(_.and (list (_.string?/1 @alt_error)
(_.string=?/2 ..pm_error @alt_error)))
on_failure])
{.#None}
happy_path))
(def (pattern_matching' expression archive)
(Generator Path)
(function (again pathP)
(.case pathP
{/////synthesis.#Then bodyS}
(expression archive bodyS)
{/////synthesis.#Pop}
(///////phase#in pop_cursor!)
{/////synthesis.#Bind register}
(///////phase#in (_.define_constant (..register register) ..peek))
{/////synthesis.#Bit_Fork when thenP elseP}
(do [! ///////phase.monad]
[then! (again thenP)
else! (.case elseP
{.#Some elseP}
(again elseP)
{.#None}
(in ..fail!))]
(in (.if when
(_.if ..peek
then!
else!)
(_.if ..peek
else!
then!))))
(^.with_template [<tag> <format> <=>]
[{<tag> item}
(do [! ///////phase.monad]
[clauses (monad.each ! (function (_ [match then])
(do !
[then! (again then)]
(in [(<=> (|> match <format>)
..peek)
then!])))
{.#Item item})]
(in (list#mix (function (_ [when then] else)
(_.if when then else))
..fail!
clauses)))])
([/////synthesis.#I64_Fork //primitive.i64 _.=/2]
[/////synthesis.#F64_Fork //primitive.f64 _.=/2]
[/////synthesis.#Text_Fork //primitive.text _.string=?/2])
(^.with_template [<pm> <flag> <prep>]
[(<pm> idx)
(///////phase#in (_.let (list [@temp (|> idx <prep> .int _.int (//runtime.sum//get ..peek (_.bool <flag>)))])
(_.if (_.null?/1 @temp)
..fail!
(push_cursor! @temp))))])
([/////synthesis.side/left false (<|)]
[/////synthesis.side/right true ++])
(/////synthesis.member/left 0)
(///////phase#in (..push_cursor! (_.vector_ref/2 ..peek (_.int +0))))
(^.with_template [<pm> <getter>]
[(<pm> lefts)
(///////phase#in (|> ..peek (<getter> (_.int (.int lefts))) ..push_cursor!))])
([/////synthesis.member/left //runtime.tuple//left]
[/////synthesis.member/right //runtime.tuple//right])
(/////synthesis.path/seq leftP rightP)
(do ///////phase.monad
[leftO (again leftP)
rightO (again rightP)]
(in (_.begin (list leftO
rightO))))
(/////synthesis.path/alt leftP rightP)
(do [! ///////phase.monad]
[leftO (again leftP)
rightO (again rightP)]
(in (try_pm (_.begin (list restore_cursor!
rightO))
(_.begin (list save_cursor!
leftO)))))
)))
(def (pattern_matching expression archive pathP)
(Generator Path)
(at ///////phase.monad each
(try_pm (_.raise/1 (_.string "Invalid expression for pattern-matching.")))
(pattern_matching' expression archive pathP)))
(def .public (case expression archive [valueS pathP])
(Generator [Synthesis Path])
(do [! ///////phase.monad]
[valueO (expression archive valueS)]
(<| (at ! each (_.let (list [@cursor (_.list/* (list valueO))]
[@savepoint (_.list/* (list))])))
(pattern_matching expression archive pathP))))
|
