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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]
["&;" module]
["&;" env]
(module ["&;" def])))
(type: #export Pattern Void)
(type: #export (Analysis' Analysis)
(#Bool Bool)
(#Nat Nat)
(#Int Int)
(#Deg Deg)
(#Real Real)
(#Char Char)
(#Text Text)
(#Variant Nat Bool Analysis)
#Unit
(#Tuple (List Analysis))
(#Call Analysis (List Analysis))
(#Case (List [Pattern Analysis]))
(#Function Scope Analysis)
(#Var Ref)
(#Def Ident)
(#Procedure Text (List Analysis))
)
(type: #export #rec Analysis
(Meta [Type Cursor]
(Analysis' Analysis)))
(def: (with-expected-type expected action)
(All [a] (-> Type (Lux a) (Lux a)))
(function [compiler]
(case (action (set@ #;expected (#;Some expected) compiler))
(#E;Success [compiler' output])
(let [old-expected (get@ #;expected compiler)]
(#E;Success [(set@ #;expected old-expected compiler')
output]))
(#E;Error error)
(#E;Error error))))
(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]
(#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]
(#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]
(#Tuple (L/append =prevs (list =last)))]))
))))
(def: (within-type-env action)
(All [a] (-> (TC;Check a) (Lux a)))
(function [compiler]
(case (action (get@ #;type-context compiler))
(#E;Error error)
(#E;Error error)
(#E;Success [context' output])
(#E;Success [(set@ #;type-context context' compiler)
output]))))
(def: get-type
(-> Analysis Type)
(|>. product;left
product;left))
(def: (replace-type replacement analysis)
(-> Type Analysis Analysis)
(let [[[_type _cursor] _analysis] analysis]
(: Analysis
[[(: Type replacement)
(: Cursor _cursor)]
(: (Analysis' Analysis)
_analysis)])))
(def: (clean-analysis type analysis)
(-> Type Analysis (Lux Analysis))
(case type
(#;VarT id)
(do Monad<Lux>
[=type (within-type-env
(TC;clean id type))]
(wrap (replace-type =type analysis)))
(#;ExT id)
(undefined)
_
(&;fail (format "Cannot clean type: " (%type type)))))
(def: (with-unknown-type action)
(All [a] (-> (Lux Analysis) (Lux Analysis)))
(do Monad<Lux>
[[var-id var-type] (within-type-env
TC;create-var)
analysis (|> (wrap action)
(%> @
[(with-expected-type var-type)]
[(clean-analysis var-type)]))
_ (within-type-env
(TC;delete-var var-id))]
(wrap analysis)))
(def: (tuple cursor members)
(-> Cursor (List Analysis) Analysis)
(let [tuple-type (type;tuple (L/map get-type members))]
[[tuple-type cursor]
(#Tuple members)]))
(def: (realize expected)
(-> Type (TC;Check [(List Type) Type]))
(case expected
(#;NamedT [module name] _expected)
(realize _expected)
(#;UnivQ env body)
(do TC;Monad<Check>
[[var-id var-type] TC;create-var
[tail =expected] (realize (default (undefined)
(type;apply-type expected var-type)))]
(wrap [(list& var-type tail)
=expected]))
(#;ExQ env body)
(do TC;Monad<Check>
[[ex-id ex-type] TC;existential
[tail =expected] (realize (default (undefined)
(type;apply-type expected ex-type)))]
(wrap [(list& ex-type tail)
=expected]))
_
(:: TC;Monad<Check> wrap [(list) expected])))
(def: (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 (replace-type expected =tuple)))
(do @
[=members (mapM @ (<|. with-unknown-type
analyse)
members)
#let [=tuple (tuple cursor =members)]
_ (within-type-env
(TC;check expected (get-type =tuple)))]
(wrap (replace-type expected =tuple)))))
_
(if (type;quantified? expected)
(do @
[[bindings expected'] (within-type-env
(realize expected))
=tuple (with-expected-type expected'
(analyse-tuple analyse cursor members))
=tuple (foldM @ clean-analysis =tuple bindings)
_ (within-type-env
(TC;check expected (get-type =tuple)))]
(wrap (replace-type expected =tuple)))
(&;fail (format "Invalid type for tuple: " (%type expected))))
)))
(def: (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]
(#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
(realize expected))
=variant (with-expected-type expected'
(analyse-variant analyse cursor tag value))
=variant (foldM @ clean-analysis =variant bindings)
_ (within-type-env
(TC;check expected (get-type =variant)))]
(wrap (replace-type expected =variant)))
(&;fail (format "Invalid type for variant: " (%type expected)))))))
(def: (analyse eval ast)
(-> (-> Type AST (Lux Top)) AST (Lux Analysis))
(do Monad<Lux>
[]
(case ast
(^template [<ast-tag> <analysis-tag> <type>]
[cursor (<ast-tag> value)]
(do @
[expected macro;expected-type
_ (within-type-env
(TC;check expected <type>))]
(wrap [[<type> cursor]
(<analysis-tag> value)])))
([#;BoolS #Bool Bool]
[#;NatS #Nat Nat]
[#;IntS #Int Int]
[#;DegS #Deg Deg]
[#;RealS #Real Real]
[#;CharS #Char Char]
[#;TextS #Text Text])
(^ [cursor (#;TupleS (list))])
(do @
[expected macro;expected-type
_ (within-type-env
(TC;check expected Unit))]
(wrap [[Unit cursor]
#Unit]))
(^ [cursor (#;TupleS (list singleton))])
(analyse eval singleton)
(^ [cursor (#;TupleS elems)])
(do @
[expected macro;expected-type]
(with-expected-type expected
(analyse-tuple (analyse eval) cursor elems)))
[cursor (#;SymbolS ["" local-name])]
(do @
[?local (&env;find local-name)]
(case ?local
(#;Some [actual index])
(do @
[expected macro;expected-type
_ (within-type-env
(TC;check expected actual))]
(wrap [[expected cursor]
(#Var index)]))
#;None
(do @
[this-module macro;current-module-name]
(analyse eval [cursor (#;SymbolS [this-module local-name])]))))
[cursor (#;SymbolS def-name)]
(do @
[expected macro;expected-type
actual (&def;find def-name)
_ (within-type-env
(TC;check expected actual))]
(wrap [[expected cursor]
(#Def def-name)]))
(^ [cursor (#;FormS (list [_ (#;SymbolS ["" "_lux_check"])]
type
value))])
(do @
[expected macro;expected-type
actual (eval Type type)
_ (within-type-env
(TC;check expected actual))]
(with-expected-type actual
(analyse eval value)))
(^ [cursor (#;FormS (list [_ (#;SymbolS ["" "_lux_coerce"])]
type
value))])
(do @
[expected macro;expected-type
actual (eval Type type)
_ (within-type-env
(TC;check expected actual))
=value (with-expected-type Top
(analyse eval value))]
(wrap (replace-type actual =value)))
(^ [cursor (#;FormS (list [_ (#;NatS tag)]
value))])
(analyse-variant (analyse eval) cursor tag value)
_
(&;fail (format "Unrecognized syntax: " (%ast ast)))
)))
|
