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Lazily split string

Splits strings lazily, instead of splitting entire string into an array like System.String.Split. Especially useful for very large strings.

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module String =

  let split (sep:string) (str:string) =
    match sep, str with
    | ((null | ""), _) | (_, (null | "")) -> seq [str]
    | _ ->
      let n, j = str.Length, sep.Length
      let rec loop p = 
        seq {
          if p < n then
            let i = match str.IndexOf(sep, p) with -1 -> n | i -> i
            yield str.Substring(p, i - p)
            yield! loop (i + j)
        }
      loop 0

module String

from Microsoft.FSharp.Core

val split : sep:string -> str:string -> seq<string>

Full name: Script.String.split

val sep : string

Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = System.String

Full name: Microsoft.FSharp.Core.string

val str : string

Multiple items
val seq : sequence:seq<'T> -> seq<'T>

Full name: Microsoft.FSharp.Core.Operators.seq

--------------------
type seq<'T> = System.Collections.Generic.IEnumerable<'T>

Full name: Microsoft.FSharp.Collections.seq<_>

val n : int

val j : int

property System.String.Length: int

val loop : (int -> seq<string>)

val p : int

val i : int

System.String.IndexOf(value: string) : int
System.String.IndexOf(value: char) : int
System.String.IndexOf(value: string, comparisonType: System.StringComparison) : int
System.String.IndexOf(value: string, startIndex: int) : int
System.String.IndexOf(value: char, startIndex: int) : int
System.String.IndexOf(value: string, startIndex: int, comparisonType: System.StringComparison) : int
System.String.IndexOf(value: string, startIndex: int, count: int) : int
System.String.IndexOf(value: char, startIndex: int, count: int) : int
System.String.IndexOf(value: string, startIndex: int, count: int, comparisonType: System.StringComparison) : int

System.String.Substring(startIndex: int) : string
System.String.Substring(startIndex: int, length: int) : string

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More information

Link:	http://fssnip.net/27
Posted:	13 years ago
Author:	Daniel Robinson
Tags:	parsing , strings