Parse currency conversion rates from European Central Bank

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#if INTERACTIVE
#r "System.Xml.dll"
#r "System.Xml.Linq.dll"
#endif

open System
open System.Net
open System.IO
open System.Xml.Linq

let fetch() = 
    let currencyUrl = "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml"
    let req = WebRequest.Create (currencyUrl) :?> HttpWebRequest
    use stream = req.GetResponse().GetResponseStream()
    use reader = new StreamReader(stream)
    reader.ReadToEnd()

let parsedoc() =
    let xn ns s = XName.Get(s,ns)
    let xml = fetch() |> XDocument.Parse
    let xns = xn (xml.Root.Attribute(XName.Get("xmlns")).Value)

    let cubedata = xml.Descendants(xns "Cube") 
                   |> Seq.filter(fun x -> x.HasAttributes) |> Seq.head 

    let time = cubedata.Attribute(xn "" "time").Value |> DateTime.Parse

    let currencies =
        cubedata.Descendants(xns "Cube") |>
            Seq.map(fun c -> c.Attribute(xn "" "currency").Value, 
                             c.Attribute(xn "" "rate").Value |> Decimal.Parse)

    time, currencies |> Map.ofSeq

namespace System

namespace System.Net

namespace System.IO

namespace System.Xml

namespace System.Xml.Linq

val fetch : unit -> string

Full name: Script.fetch

val currencyUrl : string

val req : HttpWebRequest

type WebRequest =
  inherit MarshalByRefObject
  member Abort : unit -> unit
  member AuthenticationLevel : AuthenticationLevel with get, set
  member BeginGetRequestStream : callback:AsyncCallback * state:obj -> IAsyncResult
  member BeginGetResponse : callback:AsyncCallback * state:obj -> IAsyncResult
  member CachePolicy : RequestCachePolicy with get, set
  member ConnectionGroupName : string with get, set
  member ContentLength : int64 with get, set
  member ContentType : string with get, set
  member Credentials : ICredentials with get, set
  member EndGetRequestStream : asyncResult:IAsyncResult -> Stream
  ...

Full name: System.Net.WebRequest

WebRequest.Create(requestUri: Uri) : WebRequest
WebRequest.Create(requestUriString: string) : WebRequest

type HttpWebRequest =
  inherit WebRequest
  member Abort : unit -> unit
  member Accept : string with get, set
  member AddRange : range:int -> unit + 7 overloads
  member Address : Uri
  member AllowAutoRedirect : bool with get, set
  member AllowWriteStreamBuffering : bool with get, set
  member AutomaticDecompression : DecompressionMethods with get, set
  member BeginGetRequestStream : callback:AsyncCallback * state:obj -> IAsyncResult
  member BeginGetResponse : callback:AsyncCallback * state:obj -> IAsyncResult
  member ClientCertificates : X509CertificateCollection with get, set
  ...

Full name: System.Net.HttpWebRequest

val stream : Stream

HttpWebRequest.GetResponse() : WebResponse

val reader : StreamReader

Multiple items
type StreamReader =
  inherit TextReader
  new : stream:Stream -> StreamReader + 9 overloads
  member BaseStream : Stream
  member Close : unit -> unit
  member CurrentEncoding : Encoding
  member DiscardBufferedData : unit -> unit
  member EndOfStream : bool
  member Peek : unit -> int
  member Read : unit -> int + 1 overload
  member ReadLine : unit -> string
  member ReadToEnd : unit -> string
  ...

Full name: System.IO.StreamReader

--------------------
StreamReader(stream: Stream) : unit
StreamReader(path: string) : unit
StreamReader(stream: Stream, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(stream: Stream, encoding: Text.Encoding) : unit
StreamReader(path: string, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(path: string, encoding: Text.Encoding) : unit
StreamReader(stream: Stream, encoding: Text.Encoding, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(path: string, encoding: Text.Encoding, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(stream: Stream, encoding: Text.Encoding, detectEncodingFromByteOrderMarks: bool, bufferSize: int) : unit
StreamReader(path: string, encoding: Text.Encoding, detectEncodingFromByteOrderMarks: bool, bufferSize: int) : unit

StreamReader.ReadToEnd() : string

val parsedoc : unit -> DateTime * Map<string,decimal>

Full name: Script.parsedoc

val xn : (string -> string -> XName)

val ns : string

val s : string

type XName =
  member Equals : obj:obj -> bool
  member GetHashCode : unit -> int
  member LocalName : string
  member Namespace : XNamespace
  member NamespaceName : string
  member ToString : unit -> string
  static member Get : expandedName:string -> XName + 1 overload

Full name: System.Xml.Linq.XName

XName.Get(expandedName: string) : XName
XName.Get(localName: string, namespaceName: string) : XName

val xml : XDocument

Multiple items
type XDocument =
  inherit XContainer
  new : unit -> XDocument + 3 overloads
  member Declaration : XDeclaration with get, set
  member DocumentType : XDocumentType
  member NodeType : XmlNodeType
  member Root : XElement
  member Save : fileName:string -> unit + 6 overloads
  member WriteTo : writer:XmlWriter -> unit
  static member Load : uri:string -> XDocument + 7 overloads
  static member Parse : text:string -> XDocument + 1 overload

Full name: System.Xml.Linq.XDocument

--------------------
XDocument() : unit
XDocument([<ParamArray>] content: obj []) : unit
XDocument(other: XDocument) : unit
XDocument(declaration: XDeclaration, [<ParamArray>] content: obj []) : unit

XDocument.Parse(text: string) : XDocument
XDocument.Parse(text: string, options: LoadOptions) : XDocument

val xns : (string -> XName)

property XDocument.Root: XElement

XElement.Attribute(name: XName) : XAttribute

val cubedata : XElement

XContainer.Descendants() : Collections.Generic.IEnumerable<XElement>
XContainer.Descendants(name: XName) : Collections.Generic.IEnumerable<XElement>

module Seq

from Microsoft.FSharp.Collections

val filter : predicate:('T -> bool) -> source:seq<'T> -> seq<'T>

Full name: Microsoft.FSharp.Collections.Seq.filter

val x : XElement

property XElement.HasAttributes: bool

val head : source:seq<'T> -> 'T

Full name: Microsoft.FSharp.Collections.Seq.head

val time : DateTime

Multiple items
type DateTime =
  struct
    new : ticks:int64 -> DateTime + 10 overloads
    member Add : value:TimeSpan -> DateTime
    member AddDays : value:float -> DateTime
    member AddHours : value:float -> DateTime
    member AddMilliseconds : value:float -> DateTime
    member AddMinutes : value:float -> DateTime
    member AddMonths : months:int -> DateTime
    member AddSeconds : value:float -> DateTime
    member AddTicks : value:int64 -> DateTime
    member AddYears : value:int -> DateTime
    ...
  end

Full name: System.DateTime

--------------------
DateTime()
   (+0 other overloads)
DateTime(ticks: int64) : unit
   (+0 other overloads)
DateTime(ticks: int64, kind: DateTimeKind) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int, calendar: Globalization.Calendar) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, kind: DateTimeKind) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, calendar: Globalization.Calendar) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, millisecond: int) : unit
   (+0 other overloads)
DateTime(year: int, month: int, day: int, hour: int, minute: int, second: int, millisecond: int, kind: DateTimeKind) : unit
   (+0 other overloads)

DateTime.Parse(s: string) : DateTime
DateTime.Parse(s: string, provider: IFormatProvider) : DateTime
DateTime.Parse(s: string, provider: IFormatProvider, styles: Globalization.DateTimeStyles) : DateTime

val currencies : seq<string * decimal>

val map : mapping:('T -> 'U) -> source:seq<'T> -> seq<'U>

Full name: Microsoft.FSharp.Collections.Seq.map

val c : XElement

Multiple items
type Decimal =
  struct
    new : value:int -> decimal + 7 overloads
    member CompareTo : value:obj -> int + 1 overload
    member Equals : value:obj -> bool + 1 overload
    member GetHashCode : unit -> int
    member GetTypeCode : unit -> TypeCode
    member ToString : unit -> string + 3 overloads
    static val Zero : decimal
    static val One : decimal
    static val MinusOne : decimal
    static val MaxValue : decimal
    ...
  end

Full name: System.Decimal

--------------------
Decimal()
Decimal(value: int) : unit
Decimal(value: uint32) : unit
Decimal(value: int64) : unit
Decimal(value: uint64) : unit
Decimal(value: float32) : unit
Decimal(value: float) : unit
Decimal(bits: int []) : unit
Decimal(lo: int, mid: int, hi: int, isNegative: bool, scale: byte) : unit

Decimal.Parse(s: string) : decimal
Decimal.Parse(s: string, provider: IFormatProvider) : decimal
Decimal.Parse(s: string, style: Globalization.NumberStyles) : decimal
Decimal.Parse(s: string, style: Globalization.NumberStyles, provider: IFormatProvider) : decimal

Multiple items
module Map

from Microsoft.FSharp.Collections

--------------------
type Map<'Key,'Value (requires comparison)> =
  interface IEnumerable
  interface IComparable
  interface IEnumerable<KeyValuePair<'Key,'Value>>
  interface ICollection<KeyValuePair<'Key,'Value>>
  interface IDictionary<'Key,'Value>
  new : elements:seq<'Key * 'Value> -> Map<'Key,'Value>
  member Add : key:'Key * value:'Value -> Map<'Key,'Value>
  member ContainsKey : key:'Key -> bool
  override Equals : obj -> bool
  member Remove : key:'Key -> Map<'Key,'Value>
  ...

Full name: Microsoft.FSharp.Collections.Map<_,_>

--------------------
new : elements:seq<'Key * 'Value> -> Map<'Key,'Value>

val ofSeq : elements:seq<'Key * 'T> -> Map<'Key,'T> (requires comparison)

Full name: Microsoft.FSharp.Collections.Map.ofSeq