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(.module:
[lux (#- nat int rev)
[control
["." equivalence (#+ Equivalence)]]
[data
bit
number
name
["." text (#+ Equivalence<Text>) ("text/." Monoid<Text>)]
[collection
["." list ("list/." Functor<List> Fold<List>)]]]])
## [Types]
## (type: (Code' w)
## (#.Bit Bit)
## (#.Nat Nat)
## (#.Int Int)
## (#.Frac Frac)
## (#.Text Text)
## (#.Identifier Name)
## (#.Tag Name)
## (#.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)])]
[bit Bit #.Bit]
[nat Nat #.Nat]
[int Int #.Int]
[rev Rev #.Rev]
[frac Frac #.Frac]
[text Text #.Text]
[identifier Name #.Identifier]
[tag Name #.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-identifier #.Identifier "Produces a local identifier (an identifier with no module prefix)."]
[local-tag #.Tag "Produces a local tag (a tag with no module prefix)."])
## [Structures]
(structure: #export _ (Equivalence Code)
(def: (= x y)
(case [x y]
(^template [<tag> <eq>]
[[_ (<tag> x')] [_ (<tag> y')]]
(:: <eq> = x' y'))
([#.Bit Equivalence<Bit>]
[#.Nat Equivalence<Nat>]
[#.Int Equivalence<Int>]
[#.Rev Equivalence<Rev>]
[#.Frac Equivalence<Frac>]
[#.Text Equivalence<Text>]
[#.Identifier Equivalence<Name>]
[#.Tag Equivalence<Name>])
(^template [<tag>]
[[_ (<tag> xs')] [_ (<tag> ys')]]
(:: (list.Equivalence<List> =) = xs' ys'))
([#.Form]
[#.Tuple])
[[_ (#.Record xs')] [_ (#.Record ys')]]
(:: (list.Equivalence<List> (equivalence.product = =))
= xs' ys')
_
#0)))
## [Values]
(def: #export (to-text ast)
(-> Code Text)
(case ast
(^template [<tag> <struct>]
[_ (<tag> value)]
(:: <struct> encode value))
([#.Bit Codec<Text,Bit>]
[#.Nat Codec<Text,Nat>]
[#.Int Codec<Text,Int>]
[#.Rev Codec<Text,Rev>]
[#.Frac Codec<Text,Frac>]
[#.Identifier Codec<Text,Name>])
[_ (#.Text value)]
(text.encode value)
[_ (#.Tag name)]
(text/compose "#" (:: Codec<Text,Name> encode name))
(^template [<tag> <open> <close>]
[_ (<tag> members)]
($_ text/compose <open> (|> members (list/map to-text) (list.interpose " ") (text.join-with "")) <close>))
([#.Form "(" ")"]
[#.Tuple "[" "]"])
[_ (#.Record pairs)]
($_ text/compose
"{"
(|> pairs
(list/map (function (_ [left right])
($_ text/compose (to-text left) " " (to-text right))))
(list.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 (:: Equivalence<Code> = original ast)
substitute
(case ast
(^template [<tag>]
[cursor (<tag> parts)]
[cursor (<tag> (list/map (replace original substitute) parts))])
([#.Form]
[#.Tuple])
[cursor (#.Record parts)]
[cursor (#.Record (list/map (function (_ [left right])
[(replace original substitute left)
(replace original substitute right)])
parts))]
_
ast)))
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