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(.module:
[lux #- nat int deg]
(lux (control [equality #+ Eq])
(data bool
number
[text #+ Eq<Text> "Text/" Monoid<Text>]
ident
(coll [list #* "" Functor<List> Fold<List>])
)))
## [Types]
## (type: (Code' w)
## (#.Bool Bool)
## (#.Nat Nat)
## (#.Int Int)
## (#.Frac Frac)
## (#.Text Text)
## (#.Symbol Text Text)
## (#.Tag Text Text)
## (#.Form (List (w (Code' w))))
## (#.Tuple (List (w (Code' w))))
## (#.Record (List [(w (Code' w)) (w (Code' w))])))
## (type: Code
## (Ann Cursor (Code' (Ann Cursor))))
## [Utils]
(def: _cursor Cursor ["" +0 +0])
## [Functions]
(do-template [<name> <type> <tag>]
[(def: #export (<name> x)
(-> <type> Code)
[_cursor (<tag> x)])]
[bool Bool #.Bool]
[nat Nat #.Nat]
[int Int #.Int]
[deg Deg #.Deg]
[frac Frac #.Frac]
[text Text #.Text]
[symbol Ident #.Symbol]
[tag Ident #.Tag]
[form (List Code) #.Form]
[tuple (List Code) #.Tuple]
[record (List [Code Code]) #.Record]
)
(do-template [<name> <tag> <doc>]
[(def: #export (<name> name)
{#.doc <doc>}
(-> Text Code)
[_cursor (<tag> ["" name])])]
[local-symbol #.Symbol "Produces a local symbol (a symbol with no module prefix)."]
[local-tag #.Tag "Produces a local tag (a tag with no module prefix)."])
## [Structures]
(struct: #export _ (Eq Code)
(def: (= x y)
(case [x y]
(^template [<tag> <eq>]
[[_ (<tag> x')] [_ (<tag> y')]]
(:: <eq> = x' y'))
([#.Bool Eq<Bool>]
[#.Nat Eq<Nat>]
[#.Int Eq<Int>]
[#.Deg Eq<Deg>]
[#.Frac Eq<Frac>]
[#.Text Eq<Text>]
[#.Symbol Eq<Ident>]
[#.Tag Eq<Ident>])
(^template [<tag>]
[[_ (<tag> xs')] [_ (<tag> ys')]]
(and (:: Eq<Nat> = (size xs') (size ys'))
(fold (function (_ [x' y'] old)
(and old (= x' y')))
true
(zip2 xs' ys'))))
([#.Form]
[#.Tuple])
[[_ (#.Record xs')] [_ (#.Record ys')]]
(and (:: Eq<Nat> = (size xs') (size ys'))
(fold (function (_ [[xl' xr'] [yl' yr']] old)
(and old (= xl' yl') (= xr' yr')))
true
(zip2 xs' ys')))
_
false)))
## [Values]
(def: #export (to-text ast)
(-> Code Text)
(case ast
(^template [<tag> <struct>]
[_ (<tag> value)]
(:: <struct> encode value))
([#.Bool Codec<Text,Bool>]
[#.Nat Codec<Text,Nat>]
[#.Int Codec<Text,Int>]
[#.Deg Codec<Text,Deg>]
[#.Frac Codec<Text,Frac>]
[#.Symbol Codec<Text,Ident>])
[_ (#.Text value)]
(text.encode value)
[_ (#.Tag ident)]
(Text/compose "#" (:: Codec<Text,Ident> encode ident))
(^template [<tag> <open> <close>]
[_ (<tag> members)]
($_ Text/compose <open> (|> members (map to-text) (interpose " ") (text.join-with "")) <close>))
([#.Form "(" ")"]
[#.Tuple "[" "]"])
[_ (#.Record pairs)]
($_ Text/compose "{" (|> pairs (map (function (_ [left right]) ($_ Text/compose (to-text left) " " (to-text right)))) (interpose " ") (text.join-with "")) "}")
))
(def: #export (replace original substitute ast)
{#.doc "Replaces all code that looks like the 'original' with the 'substitute'."}
(-> Code Code Code Code)
(if (:: Eq<Code> = original ast)
substitute
(case ast
(^template [<tag>]
[cursor (<tag> parts)]
[cursor (<tag> (map (replace original substitute) parts))])
([#.Form]
[#.Tuple])
[cursor (#.Record parts)]
[cursor (#.Record (map (function (_ [left right])
[(replace original substitute left)
(replace original substitute right)])
parts))]
_
ast)))
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