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|
(;module:
lux
(lux (control monad
pipe)
[io #- run]
(concurrency ["A" atom])
(data [text "T/" Eq<Text>]
text/format
(coll [list "L/" Fold<List> Monoid<List> Monad<List>]
["D" dict])
[number]
[product])
[macro #+ Monad<Lux>]
[type]
(type ["TC" check]))
(luxc ["&" base]
(lang ["la" analysis #+ Analysis])
["&;" module]
["&;" env]
(analyser ["&;" common])))
## [Analysers]
(def: (analyse-typed-tuple analyse members)
(-> &;Analyser (List Code) (Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type]
(let [member-types (type;flatten-tuple expected)
num-types (list;size member-types)
num-members (list;size members)]
(cond (n.= num-types num-members)
(do @
[=tuple (: (Lux (List Analysis))
(mapM @
(function [[expected member]]
(&;with-expected-type expected
(analyse member)))
(list;zip2 member-types members)))]
(wrap (#la;Tuple =tuple)))
(n.< num-types num-members)
(do @
[#let [[head-ts tail-ts] (list;split (n.- +2 num-members)
member-types)]
=prevs (mapM @
(function [[expected member]]
(&;with-expected-type expected
(analyse member)))
(list;zip2 head-ts members))
=last (&;with-expected-type (type;tuple tail-ts)
(analyse (default (undefined)
(list;last members))))]
(wrap (#la;Tuple (L/append =prevs (list =last)))))
## (n.> num-types num-members)
(do @
[#let [[head-xs tail-xs] (list;split (n.- +2 num-types)
members)]
=prevs (mapM @
(function [[expected member]]
(&;with-expected-type expected
(analyse member)))
(list;zip2 member-types head-xs))
=last (&;with-expected-type (default (undefined)
(list;last member-types))
(analyse-typed-tuple analyse tail-xs))]
(wrap (#la;Tuple (L/append =prevs (list =last)))))
))))
(def: #export (analyse-tuple analyse members)
(-> &;Analyser (List Code) (Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type]
(&;with-stacked-errors
(function [_] (format "Invalid type for tuple: " (%type expected)))
(case expected
(#;Product _)
(analyse-typed-tuple analyse members)
(#;Named name unnamedT)
(&;with-expected-type unnamedT
(analyse-tuple analyse members))
(#;Var id)
(do @
[bound? (&;within-type-env
(TC;bound? id))]
(if bound?
(do @
[expected' (&;within-type-env
(TC;read-var id))]
(&;with-expected-type expected'
(analyse-tuple analyse members)))
(do @
[=members (mapM @ (|>. analyse &common;with-unknown-type)
members)
#let [tuple-type (type;tuple (L/map product;left =members))]
_ (&;within-type-env
(TC;check expected tuple-type))]
(wrap (#la;Tuple (L/map product;right =members))))))
(#;UnivQ _)
(do @
[[var-id var] (&;within-type-env
TC;existential)]
(&;with-expected-type (assume (type;apply-type expected var))
(analyse-tuple analyse members)))
(#;ExQ _)
(&common;with-var
(function [[var-id var]]
(&;with-expected-type (assume (type;apply-type expected var))
(analyse-tuple analyse members))))
_
(&;fail "")
))))
(def: #export (analyse-variant analyse tag value)
(-> &;Analyser Nat Code (Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type]
(&;with-stacked-errors
(function [_] (format "Invalid type for variant: " (%type expected)))
(case expected
(#;Sum _)
(let [flat (type;flatten-variant expected)
type-size (list;size flat)]
(if (n.< type-size tag)
(do @
[#let [last? (n.= tag (n.dec type-size))
variant-type (default (undefined)
(list;nth tag flat))]
=value (&;with-expected-type variant-type
(analyse value))]
(wrap (#la;Variant tag last? =value)))
(&;fail (format "Trying to create variant with tag beyond type's limitations." "\n"
" Tag: " (%n tag) "\n"
"Type size: " (%n type-size) "\n"
" Type: " (%type expected) "\n"))))
(#;Named name unnamedT)
(&;with-expected-type unnamedT
(analyse-variant analyse tag value))
(#;Var id)
(do @
[bound? (&;within-type-env
(TC;bound? id))]
(if bound?
(do @
[expected' (&;within-type-env
(TC;read-var id))]
(&;with-expected-type expected'
(analyse-variant analyse tag value)))
(&;fail (format "Invalid type for variant: " (%type expected)))))
(#;UnivQ _)
(do @
[[var-id var] (&;within-type-env
TC;existential)]
(&;with-expected-type (assume (type;apply-type expected var))
(analyse-variant analyse tag value)))
(#;ExQ _)
(&common;with-var
(function [[var-id var]]
(&;with-expected-type (assume (type;apply-type expected var))
(analyse-variant analyse tag value))))
_
(&;fail "")))))
|
