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| #!/usr/bin/env -S dotnet fsi --langversion:6.0 --mlcompatibility --optimize --warnaserror+:25,26
(* This construct is for ML compatibility. The syntax '(typ,...,typ) ident'
is not used in F# code. Consider using 'ident<typ,...,typ>' instead. *)
#nowarn "62"
#time "on"
open System
[<RequireQualifiedAccess>]
module Shuffle =
let private rand = new Random ()
let private swap (xs:_[]) i j =
let tv = xs[i]
xs[i] <- xs[j]
xs[j] <- tv
let string (sep:string) (str:string) =
if 1 < Seq.length str then
let xs = str.Split(sep)
xs |> Array.iteri (fun i _ -> swap xs i (rand.Next(i, xs.Length)))
xs |> Array.reduce (fun x y -> sprintf "%s%s%s" x sep y)
else
str
module Parser =
type chars = char seq
module Converters =
[<RequireQualifiedAccess>]
module Chars =
let fromString (str:string) : chars = Seq.map id str
let toString (cs:chars) = cs |> Seq.map string |> Seq.fold (+) ""
let toInt (cs:chars) = cs |> toString |> int
module Combinator =
open Converters
type index = int
type error = string seq
type 'a output = (index * 'a * chars, error) Result
type 'a parser = index -> chars -> 'a output
let parse f (i:index) (cs:chars) : 'a output =
f i cs
(* Functor *)
let fmapP (f:'a -> 'b) (p:'a parser) : 'b parser =
fun i cs ->
match p i cs with
| Ok (j, a, rs) ->
Ok (j, f a, rs)
| Error es ->
Error <| seq { yield! es }
let (<!>) : ('a -> 'b) -> 'a parser -> 'b parser = fmapP
(* Applicative *)
let pureP a : 'a parser =
fun i cs ->
Ok (i, a, cs)
let lift2AP f (p1:'a parser) (p2:'b parser) : 'c parser =
fun i cs ->
match p1 i cs with
| Ok (j, a, xs) ->
match p2 j xs with
| Ok (k, b, ys) ->
Ok (k, f a b, ys)
| Error es2 ->
Error <| seq { yield! es2 }
| Error es1 ->
Error <| seq { yield! es1 }
let (<*>) (p1:('a -> 'b) parser) (p2:'a parser) : 'b parser =
fun i cs ->
match p1 i cs with
| Ok (j, f, xs) ->
match p2 j xs with
| Ok (k, a, ys) ->
Ok (k, f a, ys)
| Error es2 ->
Error <| seq { yield! es2 }
| Error es1 ->
Error <| seq { yield! es1 }
let ( *>) (p1:'a parser) (p2:'b parser) : 'b parser =
fun i cs ->
match p1 i cs with
| Ok (j, _, rs) ->
p2 j rs
| Error es ->
Error <| seq { yield! es }
let (<* ) (p1:'a parser) (p2:'b parser) : 'a parser =
lift2AP (fun x _ -> x) p1 p2
(* Monad *)
let bindP (p: 'a parser) (f: 'a -> 'b parser) : 'b parser =
fun i cs ->
match p i cs with
| Ok (j, a, ts) ->
parse (f a) j ts
| Error es1 ->
Error <| seq { yield! es1 }
let joinP (pp:'a parser parser) : 'a parser =
fun i cs ->
match pp i cs with
| Ok (j, p, rs) ->
p j rs
| Error es ->
Error <| seq { yield! es }
let (>>=) : 'a parser -> ('a -> 'b parser) -> 'b parser = bindP
type ParserBuilder () =
member __.Bind (p: 'a parser, f: 'a -> 'b parser) : 'b parser =
bindP p f
member __.Return a : 'a parser =
pureP a
member __.ReturnFrom p : 'a parser =
p
let parser = ParserBuilder ()
(* Alternate *)
let (<|>) (p1:'a parser) (p2:'a parser) : 'a parser =
fun i cs ->
match p1 i cs with
| Error es1 ->
match p2 i cs with
| Error es2 ->
seq {
yield! es1
yield! es2
}
|> Error
| ok2 ->
ok2
| ok1 ->
ok1
(* Error *)
let errmsg =
sprintf
"Parser error\n\
* Function.........: %s\n\
* Index............: %i\n\
* Unparsed chars...: %A\n"
(* Parsers *)
let failP (msg:string) : 'a parser =
fun i cs ->
Error <| seq { errmsg (sprintf "failP > %s" msg) i cs }
let getP : char parser =
fun i cs ->
if Seq.isEmpty cs then
Error <| seq { errmsg "getP" i cs }
else
Ok (i+1, Seq.head cs, Seq.tail cs)
let spanP f : chars parser =
fun i cs ->
let (ts,fs) =
( Seq.takeWhile f cs
, Seq.skipWhile f cs
)
if Seq.isEmpty ts then
Error <| seq { errmsg "spanP" i cs }
else
Ok (i + Seq.length ts, ts, fs)
let rec seqP p : 'a seq parser =
parser {
let! x = p
let! xs = seqP p
return
seq {
yield x
yield! xs
}
} <|> pureP Seq.empty
let sepBy p sep : 'a seq parser =
let rec aux =
( fun x xs ->
seq {
yield x
yield! xs
}
)
<!> p
<*> seqP (sep *> p)
aux <|> pureP Seq.empty
let satisfyP f : char parser =
parser {
let! x = getP
let r = f x
if r then
return x
else
let msg = sprintf "satisfyP > Result `%b` for `%c`" r x
return! (failP msg)
}
let charP c : char parser =
satisfyP ((=) c)
let stringP (str:string) : chars parser =
let rec aux cs =
parser {
if Seq.isEmpty cs then
return seq { () }
else
let h = Seq.head cs
let! x = charP h
let! xs = aux (Seq. tail cs)
return
seq {
yield x
yield! xs
}
}
str
|> Chars.fromString
|> aux
let tokenP (f:'a -> 'b) p (sep:'a parser) : 'b parser =
parser {
let! t = p
let! _ = sep (* Sample: spacesP <|> pureP Seq.empty *)
return f t
}
let spaceP : char parser =
satisfyP Char.IsWhiteSpace
let spacesP : chars parser =
spanP Char.IsWhiteSpace
let alphaP : char parser =
satisfyP Char.IsLetter
let alphasP : chars parser =
spanP Char.IsLetter
let numP : char parser =
satisfyP Char.IsNumber
let numsP : chars parser =
spanP Char.IsNumber
let alphanumP : char parser =
alphaP <|> numP
let alphanumsP : chars parser =
spanP (fun c -> Char.IsLetter c || Char.IsNumber c)
let run (p:'a parser) (str:string) =
str
|> Seq.map id
|> parse p 0
|> function
| Ok (_,a,rs) when Seq.isEmpty rs -> Ok a
| Ok (i,a,rs) -> Error <| errmsg "run" i rs
| Error e -> Error <| Seq.fold (+) "" e
open Parser
open Parser.Converters
open Parser.Combinator
type token =
| Street of string
| Number of string
| PostalCode of string
| City of string
| Region of string
| Country of string
let maybeSpacesP =
spacesP <|> pureP Seq.empty
let alphanumswsP : chars parser =
spanP
( fun c ->
Char.IsLetter c ||
Char.IsNumber c ||
Char.IsWhiteSpace c
)
let postalCodeCityP : token seq parser =
parser {
let! a = numP
let! b = numP
let! c = numP
let! d = numP
let! e = numP
let! _ = spacesP
let! city = alphasP
return
seq {
yield (PostalCode (string a + string b + string c + string d + string e))
yield (City (Chars.toString city))
}
}
let streetHelperP =
stringP "Rúa" <|>
stringP "Calle" <|>
stringP "C/"
let streetP : token seq parser =
parser {
let! ____ = streetHelperP
let! ____ = spacesP
let! name = alphanumswsP
return
seq {
yield (Street (Chars.toString name))
}
}
let numberP : token seq parser =
parser {
let! num = (stringP "s/n") <|> numsP
return
seq {
yield (Number (Chars.toString num))
}
}
let regionP : token seq parser =
parser {
let! reg = alphanumswsP
return
seq {
yield (Region (Chars.toString reg))
}
}
let countryP : token seq parser =
parser {
let! x = alphaP
let! y = alphaP
return
seq {
yield (Country (string x + string y))
}
}
let partsP =
postalCodeCityP <|> streetP <|> numberP <|> countryP <|> regionP
let addressP : token seq seq parser =
sepBy
(partsP)
(maybeSpacesP *> (charP ',') <* maybeSpacesP)
let rec main = function
| 0 -> ()
| n ->
let addr =
"Rúa Ponzos, 30, 15404 Ferrol, A Coruña, ES"
|> Shuffle.string ", "
printfn "# %s" addr
addr
|> run addressP
|> function
| Ok xs ->
xs
|> Seq.concat
|> Seq.sort
|> Seq.iter(printfn "* %A")
| error ->
printfn "%A" error
printfn "%s" String.Empty
main (n-1)
let _ =
main 7
|