(ns Range
  "Elixir Range module — integer ranges.

   In CljElixir: Ranges use first..last or first..last//step syntax.
   (Range/new 1 10) ;=> 1..10")

(defn new
  "Creates a new range.
   (Range/new 1 10) ;=> 1..10
   (Range/new 1 10 2) ;=> 1..10//2 (step of 2)"
  ([first last])
  ([first last step]))

(defn size
  "Returns the number of elements in the range.
   (Range/size (Range/new 1 10)) ;=> 10"
  [range])

(defn disjoint?
  "Returns true if two ranges don't overlap.
   (Range/disjoint? (Range/new 1 5) (Range/new 6 10)) ;=> true"
  [range1 range2])

(defn shift
  "Shifts a range by `steps`.
   (Range/shift (Range/new 1 5) 2) ;=> 3..7"
  [range steps])

(defn split
  "Splits a range at position `split`.
   (Range/split (Range/new 1 5) 3) ;=> {1..3 4..5}"
  [range split])

(defn to-list
  "Converts range to a list.
   (Range/to-list (Range/new 1 5)) ;=> [1 2 3 4 5]"
  [range])