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(.module:
[lux #*
[abstract
[codec (#+ Codec)]]
[control
["." try (#+ Try)]]
[data
["." text]]]
["." / #_
["#." nat]
["#." int]
["#." rev]
["#." frac]])
(macro: (encoding-doc tokens state)
(case tokens
(^ (list [cursor (#.Text encoding)] example-1 example-2))
(let [encoding ($_ "lux text concat"
"Given syntax for a "
encoding
" number, generates a Nat, an Int, a Rev or a Frac.")
commas "Allows for the presence of commas among the digits."
description [cursor (#.Text ($_ "lux text concat" encoding " " commas))]]
(#try.Success [state (list (` (doc (~ description)
(~ example-1)
(~ example-2))))]))
_
(#try.Failure "Wrong syntax for 'encoding-doc'.")))
(def: (comma-prefixed? number)
(-> Text Bit)
(case ("lux text index" 0 "," number)
(#.Some 0)
#1
_
#0))
(def: clean-commas
(-> Text Text)
(text.replace-all "," ""))
(template [<macro> <nat> <int> <rev> <frac> <error> <doc>]
[(macro: #export (<macro> tokens state)
{#.doc <doc>}
(case tokens
(#.Cons [meta (#.Text repr')] #.Nil)
(if (comma-prefixed? repr')
(#try.Failure <error>)
(let [repr (clean-commas repr')]
(case (:: <nat> decode repr)
(#try.Success value)
(#try.Success [state (list [meta (#.Nat value)])])
(^multi (#try.Failure _)
[(:: <int> decode repr) (#try.Success value)])
(#try.Success [state (list [meta (#.Int value)])])
(^multi (#try.Failure _)
[(:: <rev> decode repr) (#try.Success value)])
(#try.Success [state (list [meta (#.Rev value)])])
(^multi (#try.Failure _)
[(:: <frac> decode repr) (#try.Success value)])
(#try.Success [state (list [meta (#.Frac value)])])
_
(#try.Failure <error>))))
_
(#try.Failure <error>)))]
[bin /nat.binary /int.binary /rev.binary /frac.binary
"Invalid binary syntax."
(encoding-doc "binary" (bin "11001001") (bin "11,00,10,01"))]
[oct /nat.octal /int.octal /rev.octal /frac.octal
"Invalid octal syntax."
(encoding-doc "octal" (oct "615243") (oct "615,243"))]
[hex /nat.hex /int.hex /rev.hex /frac.hex
"Invalid hexadecimal syntax."
(encoding-doc "hexadecimal" (hex "deadBEEF") (hex "dead,BEEF"))]
)
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