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|
(.module:
[lux #- nat int rev]
(lux (data [product]
[error]
[text "text/" Equivalence<Text>]
(collection [list "list/" Fold<List>]))
[function])
[///reference #+ Register Variable Reference]
[//])
(type: #export #rec Primitive
#Unit
(#Bool Bool)
(#Nat Nat)
(#Int Int)
(#Rev Rev)
(#Frac Frac)
(#Text Text))
(type: #export Tag Nat)
(type: #export (Composite a)
(#Sum (Either a a))
(#Product [a a]))
(type: #export #rec Pattern
(#Simple Primitive)
(#Complex (Composite Pattern))
(#Bind Register))
(type: #export (Branch' e)
{#when Pattern
#then e})
(type: #export (Match' e)
[(Branch' e) (List (Branch' e))])
(type: #export Environment
(List Variable))
(type: #export #rec Analysis
(#Primitive Primitive)
(#Structure (Composite Analysis))
(#Reference Reference)
(#Case Analysis (Match' Analysis))
(#Function Environment Analysis)
(#Apply Analysis Analysis))
(type: #export Operation
(//.Operation .Lux))
(type: #export Compiler
(//.Compiler .Lux Code Analysis))
(type: #export Branch
(Branch' Analysis))
(type: #export Match
(Match' Analysis))
(do-template [<name> <tag>]
[(template: #export (<name> content)
(<tag> content))]
[control/case #Case]
)
(do-template [<name> <type> <tag>]
[(def: #export <name>
(-> <type> Analysis)
(|>> <tag> #Primitive))]
[bool Bool #Bool]
[nat Nat #Nat]
[int Int #Int]
[rev Rev #Rev]
[frac Frac #Frac]
[text Text #Text]
)
(type: #export (Variant a)
{#lefts Nat
#right? Bool
#value a})
(type: #export (Tuple a) (List a))
(type: #export Arity Nat)
(type: #export (Abstraction c) [Environment Arity c])
(type: #export (Application c) [c (List c)])
(def: (last? size tag)
(-> Nat Tag Bool)
(n/= (dec size) tag))
(template: #export (no-op value)
(|> +1 #///reference.Local #///reference.Variable #..Reference
(#..Function (list))
(#..Apply value)))
(do-template [<name> <type> <structure> <prep-value>]
[(def: #export (<name> size tag value)
(-> Nat Tag <type> <type>)
(let [left (function.constant (|>> #.Left #Sum <structure>))
right (|>> #.Right #Sum <structure>)]
(if (last? size tag)
(if (n/= +1 tag)
(right value)
(list/fold left
(right value)
(list.n/range +0 (n/- +2 tag))))
(list/fold left
(case value
(<structure> (#Sum _))
(<prep-value> value)
_
value)
(list.n/range +0 tag)))))]
[sum-analysis Analysis #Structure no-op]
[sum-pattern Pattern #Complex id]
)
(do-template [<name> <type> <primitive> <structure>]
[(def: #export (<name> members)
(-> (Tuple <type>) <type>)
(case (list.reverse members)
#.Nil
(<primitive> #Unit)
(#.Cons singleton #.Nil)
singleton
(#.Cons last prevs)
(list/fold (function (_ left right) (<structure> (#Product left right)))
last prevs)))]
[product-analysis Analysis #Primitive #Structure]
[product-pattern Pattern #Simple #Complex]
)
(def: #export (apply [func args])
(-> (Application Analysis) Analysis)
(list/fold (function (_ arg func) (#Apply arg func)) func args))
(do-template [<name> <type> <tag>]
[(def: #export (<name> value)
(-> <type> (Tuple <type>))
(case value
(<tag> (#Product left right))
(#.Cons left (<name> right))
_
(list value)))]
[tuple Analysis #Structure]
[tuple-pattern Pattern #Complex]
)
(do-template [<name> <type> <tag>]
[(def: #export (<name> value)
(-> <type> (Maybe (Variant <type>)))
(loop [lefts +0
variantA value]
(case variantA
(<tag> (#Sum (#.Left valueA)))
(case valueA
(<tag> (#Sum _))
(recur (inc lefts) valueA)
_
(#.Some {#lefts lefts
#right? false
#value valueA}))
(<tag> (#Sum (#.Right valueA)))
(#.Some {#lefts lefts
#right? true
#value valueA})
_
#.None)))]
[variant Analysis #Structure]
[variant-pattern Pattern #Complex]
)
(def: #export (application analysis)
(-> Analysis (Application Analysis))
(case analysis
(#Apply head func)
(let [[func' tail] (application func)]
[func' (#.Cons head tail)])
_
[analysis (list)]))
(template: #export (pattern/unit)
(#..Simple #..Unit))
(do-template [<name> <tag>]
[(template: #export (<name> content)
(#..Simple (<tag> content)))]
[pattern/bool #..Bool]
[pattern/nat #..Nat]
[pattern/int #..Int]
[pattern/rev #..Rev]
[pattern/frac #..Frac]
[pattern/text #..Text]
)
(def: #export (with-source-code source action)
(All [a] (-> Source (Operation a) (Operation a)))
(function (_ compiler)
(let [old-source (get@ #.source compiler)]
(case (action (set@ #.source source compiler))
(#error.Error error)
(#error.Error error)
(#error.Success [compiler' output])
(#error.Success [(set@ #.source old-source compiler')
output])))))
(def: fresh-bindings
(All [k v] (Bindings k v))
{#.counter +0
#.mappings (list)})
(def: fresh-scope
Scope
{#.name (list)
#.inner +0
#.locals fresh-bindings
#.captured fresh-bindings})
(def: #export (with-scope action)
(All [a] (-> (Operation a) (Operation [Scope a])))
(function (_ compiler)
(case (action (update@ #.scopes (|>> (#.Cons fresh-scope)) compiler))
(#error.Success [compiler' output])
(case (get@ #.scopes compiler')
#.Nil
(#error.Error "Impossible error: Drained scopes!")
(#.Cons head tail)
(#error.Success [(set@ #.scopes tail compiler')
[head output]]))
(#error.Error error)
(#error.Error error))))
(def: #export (with-current-module name action)
(All [a] (-> Text (Operation a) (Operation a)))
(function (_ compiler)
(case (action (set@ #.current-module (#.Some name) compiler))
(#error.Success [compiler' output])
(#error.Success [(set@ #.current-module
(get@ #.current-module compiler)
compiler')
output])
(#error.Error error)
(#error.Error error))))
(def: #export (with-cursor cursor action)
(All [a] (-> Cursor (Operation a) (Operation a)))
(if (text/= "" (product.left cursor))
action
(function (_ compiler)
(let [old-cursor (get@ #.cursor compiler)]
(case (action (set@ #.cursor cursor compiler))
(#error.Success [compiler' output])
(#error.Success [(set@ #.cursor old-cursor compiler')
output])
(#error.Error error)
(#error.Error error))))))
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