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(;module:
lux
(lux (control monad
pipe)
[io #- run]
(concurrency ["A" atom])
(data ["E" error]
[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 #*]
["&;" module]
["&;" env]
(analyser ["&;" common])))
(do-template [<name> <type> <tag>]
[(def: #export (<name> cursor value)
(-> Cursor <type> (Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type
_ (&;within-type-env
(TC;check expected <type>))]
(wrap [[expected cursor]
(#lang;Primitive (<tag> value))])))]
[analyse-bool Bool #lang;Bool]
[analyse-nat Nat #lang;Nat]
[analyse-int Int #lang;Int]
[analyse-deg Deg #lang;Deg]
[analyse-real Real #lang;Real]
[analyse-char Char #lang;Char]
[analyse-text Text #lang;Text]
)
(def: #export (analyse-unit cursor)
(-> Cursor (Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type
_ (&;within-type-env
(TC;check expected Unit))]
(wrap [[expected cursor]
(#lang;Primitive #lang;Unit)])))
(def: #export (analyse-definition cursor def-name)
(-> Cursor Ident (Lux Analysis))
(do Monad<Lux>
[actual (macro;find-def-type def-name)
expected macro;expected-type
_ (&;within-type-env
(TC;check expected actual))]
(wrap [[expected cursor]
(#lang;Reference (#lang;Absolute def-name))])))
(def: #export (analyse-variable cursor var-name)
(-> Cursor Text (Lux (Maybe Analysis)))
(do Monad<Lux>
[?var (&env;find var-name)]
(case ?var
(#;Some [actual ref])
(do @
[expected macro;expected-type
_ (&;within-type-env
(TC;check expected actual))
#let [analysis [[expected cursor]
(#lang;Reference (#lang;Relative ref))]]]
(wrap (#;Some analysis)))
#;None
(wrap #;None))))
(def: #export (analyse-reference cursor reference)
(-> Cursor Ident (Lux Analysis))
(case reference
["" simple-name]
(do Monad<Lux>
[?var (analyse-variable cursor simple-name)]
(case ?var
(#;Some analysis)
(wrap analysis)
#;None
(do @
[this-module macro;current-module-name]
(analyse-definition cursor [this-module simple-name]))))
_
(analyse-definition cursor reference)))
(def: #export (analyse-check analyse eval cursor type value)
(-> Analyser Eval Cursor AST AST (Lux Analysis))
(do Monad<Lux>
[actual (eval Type type)
#let [actual (:! Type actual)]
expected macro;expected-type
_ (&;within-type-env
(TC;check expected actual))]
(&;with-expected-type actual
(analyse eval value))))
(def: #export (analyse-coerce analyse eval cursor type value)
(-> Analyser Eval Cursor AST AST (Lux Analysis))
(do Monad<Lux>
[actual (eval Type type)
#let [actual (:! Type actual)]
expected macro;expected-type
_ (&;within-type-env
(TC;check expected actual))
=value (&;with-expected-type Top
(analyse eval value))]
(wrap (&common;replace-type actual =value))))
(def: (analyse-typed-tuple analyse cursor members)
(-> (-> AST (Lux Analysis)) Cursor
(List AST)
(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 [[expected cursor]
(#lang;Structure (#lang;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 [[expected cursor]
(#lang;Structure (#lang;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 cursor tail-xs))]
(wrap [[expected cursor]
(#lang;Structure (#lang;Tuple (L/append =prevs (list =last))))]))
))))
(def: (tuple cursor members)
(-> Cursor (List Analysis) Analysis)
(let [tuple-type (type;tuple (L/map &common;get-type members))]
[[tuple-type cursor]
(#lang;Structure (#lang;Tuple members))]))
(def: #export (analyse-tuple analyse cursor members)
(-> (-> AST (Lux Analysis)) Cursor
(List AST)
(Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type]
(case expected
(#;ProdT _)
(analyse-typed-tuple analyse cursor members)
(#;VarT id)
(do @
[bound? (&;within-type-env
(TC;bound? id))]
(if bound?
(do @
[expected' (&;within-type-env
(TC;read-var id))
=tuple (&;with-expected-type expected'
(analyse-tuple analyse cursor members))]
(wrap (&common;replace-type expected =tuple)))
(do @
[=members (mapM @ (<|. &common;with-unknown-type
analyse)
members)
#let [=tuple (tuple cursor =members)]
_ (&;within-type-env
(TC;check expected (&common;get-type =tuple)))]
(wrap (&common;replace-type expected =tuple)))))
_
(if (type;quantified? expected)
(do @
[[bindings expected'] (&;within-type-env
(&common;realize expected))
=tuple (&;with-expected-type expected'
(analyse-tuple analyse cursor members))
=tuple (foldM @ &common;clean =tuple bindings)
_ (&;within-type-env
(TC;check expected (&common;get-type =tuple)))]
(wrap (&common;replace-type expected =tuple)))
(&;fail (format "Invalid type for tuple: " (%type expected))))
)))
(def: #export (analyse-variant analyse cursor tag value)
(-> (-> AST (Lux Analysis)) Cursor
Nat AST
(Lux Analysis))
(do Monad<Lux>
[expected macro;expected-type]
(case expected
(#;SumT _)
(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 [[expected cursor]
(#lang;Structure (#lang;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"))))
_
(if (type;quantified? expected)
(do @
[[bindings expected'] (&;within-type-env
(&common;realize expected))
=variant (&;with-expected-type expected'
(analyse-variant analyse cursor tag value))
=variant (foldM @ &common;clean =variant bindings)
_ (&;within-type-env
(TC;check expected (&common;get-type =variant)))]
(wrap (&common;replace-type expected =variant)))
(&;fail (format "Invalid type for variant: " (%type expected)))))))
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