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Parsers.fsx
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Parsers.fsx
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#load @"../../.paket/load/netstandard2.0/FParsec.fsx"
#load @"../../.paket/load/netstandard2.0/System.Time.fsx"
open System
open System.Text.RegularExpressions
open FParsec
let (<||>) f g = fun x -> f x || g x
let (<&&>) f g = fun x -> f x && g x
let test parser str =
match run parser str with
| Success (s1, s2, s3) -> printfn "Ok: %A %A %A" s1 s2 s3
| Failure (f1, f2, f3) -> printfn "Fail: %A %A %A" f1 f2 f3
(*
Comment Parsers
*)
let pComment : Parser<unit,unit> = skipChar '#' >>. skipRestOfLine true
//#region String parsers
let inline isCtrlChar c =
c <= '\u001f' || c = '\u007f'
let inline isNonSpaceControlChar c =
isCtrlChar c && c <> '\n' && c <> '\r' && c <> '\t'
let pTomlSpaces : Parser<string,unit> = manySatisfy (isAnyOf ['\t';' '])
let pBareKey : Parser<string,unit>
= many1Satisfy (isAsciiLetter <||> isDigit <||> isAnyOf ['_';'-'])
let pEquals : Parser<char,unit> = pchar '='
let pBasicStringContents : Parser<string,unit> =
manySatisfy (isCtrlChar >> not <&&> isNoneOf ['\"'])
let pBasicString : Parser<string,unit> =
between (pchar '\"') (pchar '\"') pBasicStringContents
let pLiteralString : Parser<string,unit> =
manySatisfy (isNoneOf ['\'']) |> between (pchar '\'') (pchar '\'')
let pMultilineLiteralString : Parser<string,unit> =
optional newline >>. manyCharsTill anyChar (lookAhead (pstring "'''"))
|> between (pstring "'''") (pstring "'''")
let pMultilineStringContents : Parser<char,unit> =
satisfy (isNonSpaceControlChar >> not)
let pMultilineString : Parser<string,unit> =
optional newline >>. manyCharsTill pMultilineStringContents (lookAhead (pstring "\"\"\""))
|> between (pstring "\"\"\"") (pstring "\"\"\"")
|>> (fun s -> Regex.Replace(s, @"\\\s*", ""))
//#endregion
//#region Integer parsers
// Integer utility methods
let stripUnderscore = String.filter (function | '_' -> false | _ -> true)
let applySignToBigint (sign,n) =
match sign with
| Some '-' -> bigint.MinusOne * n
| _ -> n
let charDigit (c:char) = (int c) - (int '0')
let foldCharToBigint (radix:bigint) (bi:bigint) (c:char) = bi * radix + bigint (charDigit c)
let hexStringToBigint (raw:string) = bigint.Parse("0" + raw, Globalization.NumberStyles.HexNumber)
let octalStringToBigint (raw:string) = seq raw |> Seq.fold (foldCharToBigint 8I) 0I
let binaryStringToBigint (raw:string) = seq raw |> Seq.fold (foldCharToBigint 2I) 0I
//let fp_ (pChar:Parser<char,unit>) : Parser<char,unit> = pChar >>? pchar '_' .>>? pChar
let p_ : Parser<char,unit> = pchar '_' .>> (notFollowedBy (pchar '_'))
// Parsers
let pSign : Parser<char,unit> = satisfy (isAnyOf ['-';'+'])
let pNoLeading0 : Parser<unit,unit> = notFollowedByL (pchar '0' .>> lookAhead anyChar) "leading zero not allowed"
let pDecimal : Parser<bigint,unit> =
// let p_ = fp_ digit
pNoLeading0 >>. ((digit <|> p_) |> many1Chars)
|>> (stripUnderscore >> bigint.Parse)
let pHex : Parser<bigint,unit> =
// let p_ = fp_ hex
pstring "0x" >>. (hex <|> p_ |> many1Chars)
|>> (stripUnderscore >> hexStringToBigint)
let pOctal : Parser<bigint,unit> =
// let p_ = fp_ octal
pstring "0o" >>. (octal <|> p_) |> many1Chars
|>> (stripUnderscore >> octalStringToBigint)
let pBinary : Parser<bigint,unit> =
let binary = anyOf ['0';'1']
// let p_ = fp_ binary
pstring "0b" >>. (binary <|> p_ |> many1Chars)
|>> (stripUnderscore >> binaryStringToBigint)
let pInteger : Parser<bigint,unit> =
opt pSign .>>. (pHex <|> pOctal <|> pBinary <|> pDecimal)
|>> applySignToBigint
//#endregion
// NOTE: looks like we can use the build-in FParsec parser `pfloat`
//#region Float parser
// float utility functions
let parseTomlFloat = function
| "inf" -> infinity
| "nan" -> nan
| raw -> Convert.ToDouble raw
let applySignToFloat (sign,f) =
match sign with
| Some '-' -> -1.0 * f
| _ -> f
// Parsers
let pSpecial : Parser<string,unit> = pstring "inf" <|> pstring "nan"
let pFloat : Parser<float,unit> =
opt pSign .>>. (pSpecial <|> (many1Chars digit) |>> (stripUnderscore >> parseTomlFloat))
|>> applySignToFloat
//#endregion
(*
Boolean Parsers
*)
let pBool : Parser<bool,unit> = pstring "true" <|> pstring "false" |>> Boolean.Parse
//#region Date parsers
let p4DigitInt : Parser<int,unit> = parray 4 digit |>> (String >> int)
let p2DigitInt : Parser<int,unit> = parray 2 digit |>> (String >> int)
let pSeconds : Parser<(int*int),unit> = p2DigitInt .>>. opt (skipChar '.' >>. manyChars digit)
|>> (fun (sec,frac) -> match frac with
| Some str -> (sec, str.Substring(0, min str.Length 3) |> int)
| _ -> (sec, 0))
let pSkipDash : Parser<unit,unit> = skipChar '-'
let pDate : Parser<Date,unit> = pipe5 p4DigitInt pSkipDash p2DigitInt pSkipDash p2DigitInt
(fun y _ m _ d -> Date(y,m,d))
let pSkipColon : Parser<unit,unit> = skipChar ':'
let pTime : Parser<Time,unit> = pipe5 p2DigitInt pSkipColon p2DigitInt pSkipColon pSeconds
(fun h _ m _ s -> Time(h,m,fst s, snd s))
let pOffset : Parser<TimeSpan,unit> =
(pstring "Z" >>% TimeSpan(0,0,0)) <|> (pSign .>>. p2DigitInt .>> pSkipColon .>> pstring "00"
|>> (fun (sign,offset) -> match sign with
| '-' -> -1 * offset |> (fun h -> TimeSpan(h,0,0))
| _ -> TimeSpan(offset,0,0)))
let toDateTimeOffset (date:Date) _ (time:Time) offset = DateTimeOffset(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond, offset)
let pOffsetDateTime : Parser<DateTimeOffset,unit> =
pipe4 pDate (skipAnyOf [' ';'T']) pTime pOffset toDateTimeOffset
let toDateTime (date:Date) _ (time:Time) = DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond)
let pLocalDateTime : Parser<DateTime, unit> =
pipe3 pDate (skipAnyOf [' ';'T']) pTime toDateTime
//#endregion
(*
Array Parsers
*)
let pArrayOf<'a> (parser:Parser<'a,_>) : Parser<'a list, unit> =
pchar '[' >>. (sepBy parser (spaces >>. pchar ',' .>> spaces)) .>> pchar ']'
let pBasicStringArray = pArrayOf pBasicString
let pLiteralStringArray = pArrayOf pLiteralString
let pMultilineLiteralStringArray = pArrayOf pMultilineLiteralString
let pMultilineStringArray = pArrayOf pMultilineString
let pIntegerArray = pArrayOf pInteger
let pFloatArray = pArrayOf pFloat
let pBoolArray = pArrayOf pBool
let pOffsetDateTimeArray = pArrayOf pOffsetDateTime
let pLocalDateTimeArray = pArrayOf pLocalDateTime
let pLocalDateArray = pArrayOf pDate
let pLocalTimeArray = pArrayOf pTime
let pStringArray = (attempt pBasicStringArray) <|> (attempt pLiteralStringArray) <|> (attempt pMultilineLiteralStringArray) <|> (attempt pMultilineStringArray)
let mapObj (l:'a list) = List.map box l
let pArray,pArrayRef = createParserForwardedToRef()
pArrayRef :=
choice [
attempt pStringArray |>> mapObj;
attempt pIntegerArray |>> mapObj;
attempt pFloatArray |>> mapObj;
attempt pBoolArray |>> mapObj;
attempt pOffsetDateTimeArray |>> mapObj;
attempt pLocalDateTimeArray |>> mapObj;
attempt pLocalDateArray |>> mapObj;
attempt pLocalTimeArray |>> mapObj;
attempt pArray
]
(*
Table Parsers
*)