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|
(.require
[library
[lux (.except function)
[abstract
[monad (.only do)]]
[control
["[0]" maybe]
["[0]" try]
["[0]" exception (.only exception)]]
[data
["[0]" product]
["[0]" text (.only)
["%" \\format (.only format)]]
[collection
["[0]" list (.use "[1]#[0]" monoid monad)]]]
[math
[number
["n" nat]]]
["[0]" meta (.only)
["[0]" type (.only)
["[0]" check]]]]]
["[0]" ///
["[1][0]" extension]
[//
["/" analysis (.only Analysis Operation Phase)
["[1][0]" type]
["[1][0]" inference]
["[1][0]" scope]]
[///
["[1]" phase (.use "[1]#[0]" functor)]
[reference (.only)
[variable (.only)]]]]])
(exception .public (cannot_analyse [expected Type
function Text
argument Text
body Code])
(exception.report
"Type" (%.type expected)
"Function" function
"Argument" argument
"Body" (%.code body)))
(exception .public (cannot_apply [:function: Type
functionC Code
arguments (List Code)])
(exception.report
"Function type" (%.type :function:)
"Function" (%.code functionC)
"Arguments" (|> arguments
list.enumeration
(list#each (.function (_ [idx argC])
(format (%.nat idx) " " (%.code argC))))
(text.interposed text.new_line))))
(def .public (function analyse function_name arg_name archive body)
(-> Phase Text Text Phase)
(do [! ///.monad]
[expectedT (///extension.lifted meta.expected_type)]
(loop (again [expectedT expectedT])
(/.with_exception ..cannot_analyse [expectedT function_name arg_name body]
(case expectedT
{.#Function :input: :output:}
(<| (at ! each (.function (_ [scope bodyA])
{/.#Function (list#each (|>> /.variable)
(/scope.environment scope))
bodyA}))
/scope.with
... Functions have access not only to their argument, but
... also to themselves, through a local variable.
(/scope.with_local [function_name expectedT])
(/scope.with_local [arg_name :input:])
(/type.expecting :output:)
(analyse archive body))
{.#Named name :anonymous:}
(again :anonymous:)
{.#Apply argT funT}
(case (type.applied (list argT) funT)
{.#Some value}
(again value)
{.#None}
(/.failure (exception.error ..cannot_analyse [expectedT function_name arg_name body])))
{.#UnivQ _}
(do !
[[@instance :instance:] (/type.check check.existential)]
(again (maybe.trusted (type.applied (list :instance:) expectedT))))
{.#ExQ _}
(<| /type.with_var
(.function (_ [@instance :instance:]))
(again (maybe.trusted (type.applied (list :instance:) expectedT))))
{.#Var id}
(do !
[?expectedT' (/type.check (check.peek id))]
(case ?expectedT'
{.#Some expectedT'}
(again expectedT')
... Inference
_
(<| /type.with_var
(.function (_ [@input :input:]))
/type.with_var
(.function (_ [@output :output:]))
(do !
[functionA (again {.#Function :input: :output:})])
/type.check
(do check.monad
[:output: (check.identity (list) @output)
?:input: (check.try (check.identity (list @output) @input))
? (check.linked? @input @output)
_ (<| (check.check expectedT)
(case ?:input:
{try.#Success :input:}
{.#Function :input: (if ?
:input:
:output:)}
{try.#Failure _}
(|> (if ?
:input:
:output:)
{.#Function :input:}
(/inference.quantified @input 1)
{.#UnivQ (list)})))]
(in functionA)))))
_
(/.failure "")
)))))
(def .public (apply analyse argsC+ :function: functionA archive functionC)
(-> Phase (List Code) Type Analysis Phase)
(|> (/inference.general archive analyse :function: argsC+)
(///#each (|>> product.right [functionA] /.reified))
(/.with_exception ..cannot_apply [:function: functionC argsC+])))
|
