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|
(;module:
lux
(lux (control monad
pipe)
[io #- run]
(concurrency ["A" atom])
(data [text "T/" Eq<Text>]
text/format
[ident]
(coll [list "L/" Fold<List> Monoid<List> Monad<List>]
["D" dict]
["S" set])
[number]
[product])
[macro #+ Monad<Lux>]
(macro [code])
[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 "")))))
(def: (resolve-pair [key val])
(-> [Ident Code] (Lux [Type Nat Code]))
(do Monad<Lux>
[key (macro;normalize key)
[idx tag-set recordT] (macro;resolve-tag key)]
(wrap [recordT idx val])))
(def: #export (normalize-record pairs)
(-> (List [Code Code]) (Lux (List [Ident Code])))
(mapM Monad<Lux>
(function [[key val]]
(case key
[_ (#;Tag key)]
(do Monad<Lux>
[key (macro;normalize key)]
(wrap [key val]))
_
(&;fail (format "Cannot use non-tag tokens in key positions in records: " (%code key)))))
pairs))
(def: #export (order-record pairs)
(-> (List [Ident Code]) (Lux [(List Code) Type]))
(case pairs
(#;Cons [head-k head-v] _)
(do Monad<Lux>
[head-k (macro;normalize head-k)
[_ tag-set recordT] (macro;resolve-tag head-k)
#let [size-record (list;size pairs)
size-ts (list;size tag-set)]
_ (if (n.= size-ts size-record)
(wrap [])
(&;fail (format "Record size does not match tag-set size." "\n"
"Expected: " (|> size-ts nat-to-int %i) "\n"
" Actual: " (|> size-record nat-to-int %i) "\n"
"For type: " (%type recordT))))
#let [tuple-range (list;n.range +0 size-ts)
tag->idx (D;from-list ident;Hash<Ident> (list;zip2 tag-set tuple-range))]
idx->val (foldM @
(function [[key val] idx->val]
(do @
[key (macro;normalize key)]
(case (D;get key tag->idx)
#;None
(&;fail (format "Tag " (%code (code;tag key))
" does not belong to tag-set for type " (%type recordT)))
(#;Some idx)
(if (D;contains? idx idx->val)
(&;fail (format "Cannot repeat tag inside record: " (%code (code;tag key))))
(wrap (D;put idx val idx->val))))))
(: (D;Dict Nat Code)
(D;new number;Hash<Nat>))
pairs)
#let [ordered-tuple (L/map (function [idx]
(assume (D;get idx idx->val)))
tuple-range)]]
(wrap [ordered-tuple recordT]))
_
(:: Monad<Lux> wrap [(list) Unit])))
|
