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(.module:
[library
[lux #*
[abstract
[monad (#+ do)]]
[control
["<>" parser ("#\." functor)
["<.>" code (#+ Parser)]]]
[data
["." product]
[collection
["." list ("#\." fold)]]]
[macro
[syntax (#+ syntax:)]
["." code]]
[math
[number
["n" nat]
["i" int]]]]])
(type: #rec Infix
(#Const Code)
(#Call (List Code))
(#Unary Code Infix)
(#Binary Infix Code Infix))
(def: literal
(Parser Code)
($_ <>.either
(<>\map code.bit <code>.bit)
(<>\map code.nat <code>.nat)
(<>\map code.int <code>.int)
(<>\map code.rev <code>.rev)
(<>\map code.frac <code>.frac)
(<>\map code.text <code>.text)
(<>\map code.identifier <code>.identifier)
(<>\map code.tag <code>.tag)))
(def: expression
(Parser Infix)
(<| <>.rec (function (_ expression))
($_ <>.or
..literal
(<code>.form (<>.many <code>.any))
(<code>.tuple (<>.and <code>.any expression))
(<code>.tuple ($_ <>.either
(do <>.monad
[_ (<code>.this! (' #and))
init_subject expression
init_op <code>.any
init_param expression
steps (<>.some (<>.and <code>.any expression))]
(in (product.right (list\fold (function (_ [op param] [subject [_subject _op _param]])
[param [(#Binary _subject _op _param)
(` and)
(#Binary subject op param)]])
[init_param [init_subject init_op init_param]]
steps))))
(do <>.monad
[init_subject expression
init_op <code>.any
init_param expression
steps (<>.some (<>.and <code>.any expression))]
(in (list\fold (function (_ [op param] [_subject _op _param])
[(#Binary _subject _op _param) op param])
[init_subject init_op init_param]
steps)))
))
)))
(def: (prefix infix)
(-> Infix Code)
(case infix
(#Const value)
value
(#Call parts)
(code.form parts)
(#Unary op subject)
(` ((~ op) (~ (prefix subject))))
(#Binary left op right)
(` ((~ op) (~ (prefix right)) (~ (prefix left))))))
(syntax: .public (infix [expr ..expression])
(in (list (..prefix expr))))
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