Msisdn is a .NET library that facilitates working with international telephone numbers in F#. It follows the ITU-T recommendation E.164.
Features:
- Provides a type for representing phone numbers. A value of this type will ALWAYS be a valid phone number (it may not exist, but it will be valid).
- Validates MSISDN strings
- Normalizes MSISDN strings to its canonical representation
- Lets you extract country calling code and country name from Msisdn
PM> Install-Package FSharp.Msisdn
You create an Msisdn by providing a string describing the phone number, including country calling code prefix, to the create function.
// Create a fictitious Norwegian mobile number
match Msisdn.create "4799999999" with
| Some msisdn -> doSomethingWith msisdn
| None -> printfn "Not a valid MSISDN"
Note that you don't have to (actually you're not allowed to) open the Msisdn module. The module will automatically be available everywhere in a project referencing FSharp.Msisdn, but you have to use qualified access.
type T = Msisdn of string
A single case discriminated union wrapping a phone number string. YOU DON'T NEED TO REFER TO THIS TYPE DIRECTLY, AND SHOULD NOT DO SO.
val create : string -> T option
Creates an Msisdn option. If s is a valid number, returns Some Msisdn.T. If not valid, returns None. null is never a valid number.
By using an option type, create forces the caller to handle the case of invalid input, which is a good thing!
create will strip away and ignore certain characters normally found in human representations of phone numbers. These are all valid inputs:
"47 99 99 99 99" // spaces are ok
"0047 99999999" // leading zeros are ok
"+47 999-99-999" // plus and hyphens are ok
"[47](999){99999}" // brackets are ok
"47\t99999999\r\n" // even tabs and newlines are ok
val apply : (string -> 'a) -> T -> 'a
Apply function f to the canonical string representation of an Msisdn.
val value : T -> string
Get the canonical string representation of an Msisdn.
When you retrieve the value from an Msisdn, the canonical string representation is given:
Msisdn.create "0047 (999) 99-999"
|> Option.get
|> Msisdn.value // evaluates to "4799999999"
val isValid : string -> bool
Checks if string is a valid input for an Msisdn.
Verification is done for you when you create
a new Msisdn using the create function.
val canonicalize : string -> string
Transforms a valid Msisdn string to its canonical form.
This is done for you when you create a new Msisdn using
the create function.
val equals : T -> T -> bool
val compareTo : T -> T -> int
val countryCode : T -> string * string
Get the country calling code prefix (CC) and the country or destination name from an Msisdn.
let cc, description = Msisdn.create "+4799999999"
|> Option.get
|> Msisdn.countryCode
// val cc = "47"
// val description = "Norway"
CC will always be between 1 and 3 digits. The same CC will in some situations have different descriptions.
["90 312 213 2965"
"90 392 11111"]
|> List.choose Msisdn.create
|> List.map Msisdn.countryCode
// Result:
// [("90", "Turkey")
("90", "Northern Cyprus")]
This is how you may use FSharp.Msisdn to get the canonical representation from a list potensially containing some invalid numbers:
let numbers = ["47 91 92 93 94"
"1-555-32-654"
"00362347657"
"+87899877889x"]
numbers
|> List.choose Msisdn.create
|> List.map Msisdn.value
// Result:
// ["4791929394"; "155532654"; "362347657"]
Of course the same thing can be done using canonicalize and isValid directly:
numbers
|> List.map Msisdn.canonicalize
|> List.filter Msisdn.isValid
If you need to group your numbers by country code, you could do something like this:
numbers
|> List.choose Msisdn.create
|> Seq.groupBy
(fun x -> let cc, _ = Msisdn.countryCode x in cc)
// Result:
// [("47", seq [Msisdn "4791929394"])
// ("1", seq [Msisdn "155532654"])
// ("36", seq [Msisdn "362347657"])]
Copyright (c) 2015 Torbjørn Marø
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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