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| let unitsElement(x) = | |
| match x % 10 with | |
| | 0 -> [] | |
| | x -> [ string x ] | |
| let tensElement(x) = | |
| string (x / 10 * 10) | |
| let elementsFor2DigitNumber(x) = | |
| match x with | |
| | 0 -> [] | |
| | x when x < 21 -> [ string x ] | |
| | x -> tensElement(x) :: unitsElement (x) | |
| let elementsFor3DigitNumber(x) = | |
| match x with | |
| | x when x < 100 -> elementsFor2DigitNumber(x) | |
| | _ -> | |
| string (x / 100) :: "hundred" :: | |
| match x % 100 with | |
| | r when r = 0 -> [] | |
| | r -> ("and" :: elementsFor2DigitNumber(r)) | |
| let generateSeparatorText(digitGroupName, currentDigitGroup, followingDigitGroup) = | |
| match (digitGroupName, currentDigitGroup, followingDigitGroup) with | |
| | (d,c,f) when c % 1000 = 0 -> [] | |
| | (d,c,f) when d = "thousand" && f > 0 && f < 100 -> [ digitGroupName; "and" ] | |
| | (d,c,f) -> [ d ] | |
| let rec generateDigitGroupElements(x, digitGroupNames) = | |
| match x with | |
| | x when x < 1000 -> elementsFor3DigitNumber(x) | |
| | x -> | |
| match digitGroupNames with | |
| | [] -> failwith "Shouldn't get here" | |
| | digitGroupName :: tail -> | |
| let quotient = x / 1000 | |
| let remainder = x % 1000 | |
| generateDigitGroupElements(quotient, tail) @ generateSeparatorText(digitGroupName, quotient % 1000, remainder) @ elementsFor3DigitNumber(remainder) | |
| let generateElements(x) = | |
| match x with | |
| | x when x < 0 -> raise <| System.ArgumentOutOfRangeException() | |
| | x when x = 0 -> [ "0" ] | |
| | x -> (generateDigitGroupElements(x, [ "thousand"; "million"; "billion" ])) |
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