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## Copyright (c) Eduardo Julian. All rights reserved.
## This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
## If a copy of the MPL was not distributed with this file,
## You can obtain one at http://mozilla.org/MPL/2.0/.
(;module:
lux
(lux (control monad)
(data [text]
text/format
[number]
(struct [list "List/" Monad<List> Fold<List>]
[dict])
[bool]
[product])
[compiler #+ Monad<Lux>]
(macro [ast]
["s" syntax #+ syntax: Syntax])
[type]
(type ["tc" check #+ Check Monad<Check>])
))
(def: (find-type-var id env)
(-> Nat (Bindings Nat (Maybe Type)) (Lux Type))
(case (list;find (|>. product;left (n.= id))
(get@ #;mappings env))
(#;Some [_ (#;Some type)])
(case type
(#;VarT id')
(find-type-var id' env)
_
(:: Monad<Lux> wrap type))
(#;Some [_ #;None])
(compiler;fail (format "Unbound type-var " (%n id)))
#;None
(compiler;fail (format "Unknown type-var " (%n id)))
))
(def: (resolve-type var-name)
(-> Ident (Lux Type))
(do Monad<Lux>
[raw-type (compiler;find-type var-name)
compiler compiler;get-compiler]
(case raw-type
(#;VarT id)
(find-type-var id (get@ #;type-vars compiler))
_
(wrap raw-type))))
(def: (find-member-type idx sig-type)
(-> Nat Type (Check Type))
(case sig-type
(#;NamedT _ sig-type')
(find-member-type idx sig-type')
(#;AppT func arg)
(case (type;apply-type func arg)
#;None
(tc;fail (format "Can't apply type " (%type func) " to type " (%type arg)))
(#;Some sig-type')
(find-member-type idx sig-type'))
(#;ProdT left right)
(if (n.= +0 idx)
(:: Monad<Check> wrap left)
(find-member-type (n.dec idx) right))
_
(if (n.= +0 idx)
(:: Monad<Check> wrap sig-type)
(tc;fail (format "Can't find member type " (%n idx) " for " (%type sig-type))))))
(def: (resolve-member member)
(-> Ident (Lux [Nat Type]))
(do Monad<Lux>
[member (compiler;normalize member)
[idx tag-list sig-type] (compiler;resolve-tag member)]
(wrap [idx sig-type])))
(def: (prepare-defs this-module-name defs)
(-> Text (List [Text Def]) (List [Ident Type]))
(|> defs
(list;filter (lambda [[name [def-type def-anns def-value]]]
(compiler;struct? def-anns)))
(List/map (lambda [[name [def-type def-anns def-value]]]
[[this-module-name name] def-type]))))
(def: local-env
(Lux (List [Ident Type]))
(do Monad<Lux>
[local-batches compiler;locals
#let [total-locals (List/fold (lambda [[name type] table]
(dict;put~ name type table))
(: (dict;Dict Text Type)
(dict;new text;Hash<Text>))
(List/join local-batches))]]
(wrap (|> total-locals
dict;entries
(List/map (lambda [[name type]] [["" name] type]))))))
(def: local-structs
(Lux (List [Ident Type]))
(do Monad<Lux>
[this-module-name compiler;current-module-name
defs (compiler;defs this-module-name)]
(wrap (prepare-defs this-module-name defs))))
(def: import-structs
(Lux (List [Ident Type]))
(do Monad<Lux>
[this-module-name compiler;current-module-name
imp-mods (compiler;imported-modules this-module-name)
export-batches (mapM @ (lambda [imp-mod]
(do @
[exports (compiler;exports imp-mod)]
(wrap (prepare-defs imp-mod exports))))
imp-mods)]
(wrap (List/join export-batches))))
(def: (apply-function-type func arg)
(-> Type Type (Check Type))
(case func
(#;NamedT _ func')
(apply-function-type func' arg)
(#;UnivQ _)
(do Monad<Check>
[[id var] tc;create-var]
(apply-function-type (default (undefined)
(type;apply-type func var))
arg))
(#;LambdaT input output)
(do Monad<Check>
[_ (tc;check input arg)]
(wrap output))
_
(tc;fail (format "Invalid function type: " (%type func)))))
(def: (check-apply member-type input-types output-type)
(-> Type (List Type) Type (Check []))
(do Monad<Check>
[member-type' (foldM Monad<Check>
(lambda [input member]
(apply-function-type member input))
member-type
input-types)]
(tc;check output-type member-type')))
(def: compiler-type-context
(Lux tc;Context)
(lambda [compiler]
(let [type-vars (get@ #;type-vars compiler)
context (|> tc;fresh-context
(set@ #tc;var-counter (get@ #;counter type-vars))
(set@ #tc;bindings (dict;from-list number;Hash<Nat> (get@ #;mappings type-vars))))]
(#;Right [compiler context]))))
(def: (test-alternatives sig-type member-idx input-types output-type alts)
(-> Type Nat (List Type) Type (List [Ident Type]) (Lux (List Ident)))
(do Monad<Lux>
[context compiler-type-context]
(case (|> alts
(list;filter (lambda [[alt-name alt-type]]
(case (tc;run context
(do Monad<Check>
[_ (tc;check alt-type sig-type)
member-type (find-member-type member-idx alt-type)]
(check-apply member-type input-types output-type)))
(#;Left error)
false
(#;Right _)
true)))
(List/map product;left))
#;Nil
(compiler;fail "No alternatives.")
found
(wrap found))))
(def: (find-alternatives sig-type member-idx input-types output-type)
(-> Type Nat (List Type) Type (Lux (List Ident)))
(let [test (test-alternatives sig-type member-idx input-types output-type)]
($_ compiler;either
(do Monad<Lux> [alts local-env] (test alts))
(do Monad<Lux> [alts local-structs] (test alts))
(do Monad<Lux> [alts import-structs] (test alts)))))
(def: (var? input)
(-> AST Bool)
(case input
[_ (#;SymbolS _)]
true
_
false))
(def: (join-pair [l r])
(All [a] (-> [a a] (List a)))
(list l r))
(syntax: #export (::: [member s;symbol]
[args (s;alt (s;some s;symbol)
(s;some s;any))])
(case args
(#;Left args)
(do @
[[member-idx sig-type] (resolve-member member)
input-types (mapM @ resolve-type args)
output-type compiler;expected-type
chosen-ones (find-alternatives sig-type member-idx input-types output-type)]
(case chosen-ones
#;Nil
(compiler;fail (format "No structure option could be found for member: " (%ident member)))
(#;Cons chosen #;Nil)
(wrap (list (` (:: (~ (ast;symbol chosen))
(~ (ast;local-symbol (product;right member)))
(~@ (List/map ast;symbol args))))))
_
(compiler;fail (format "Too many available options: "
(|> chosen-ones
(List/map %ident)
(text;join-with ", ")
)))))
(#;Right args)
(do @
[#let [args-to-bind (list;filter (bool;complement var?) args)]
labels (seqM @ (list;repeat (list;size args-to-bind)
(compiler;gensym "")))
#let [retry (` (let [(~@ (|> (list;zip2 labels args-to-bind) (List/map join-pair) List/join))]
(;;::: (~ (ast;symbol member)) (~@ labels))))]]
(wrap (list retry)))))
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