Range interface for Intervals (#76)

* Range interface for Intervals

* Fixing error for unsupported keyword syntax

* Fixing error for unsupported keyword
step and length

* Fix error constructing range
with older Julia versions

* New version 0.5.3 for range support
on closed intervals

Project.toml

@@ -1,6 +1,6 @@
 name = "IntervalSets"
 uuid = "8197267c-284f-5f27-9208-e0e47529a953"
-version = "0.5.2"
+version = "0.5.3"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"

src/IntervalSets.jl

@@ -250,6 +250,27 @@ UnitRange{T}(i::TypedEndpointsInterval{:closed,:closed,I}) where {T<:Integer,I<:
 UnitRange(i::TypedEndpointsInterval{:closed,:closed,I}) where {I<:Integer} = UnitRange{I}(i)
 range(i::TypedEndpointsInterval{:closed,:closed,I}) where {I<:Integer} = UnitRange{I}(i)
 
+"""
+    range(i::ClosedInterval; step, length)
+    range(i::ClosedInterval, len::Integer)
+
+Constructs a range of a specified step or length.
+"""
+range(i::TypedEndpointsInterval{:closed,:closed}; step=nothing, length=nothing) =
+    range(leftendpoint(i); stop=rightendpoint(i), step=step, length=length)
+range(i::TypedEndpointsInterval{:closed,:closed}, len::Integer) = range(i; length=len)
+
+"""
+    range(i::Interval{:closed,:open}; length)
+    range(i::Interval{:closed,:open}, len::Integer)
+
+Constructs a range of a specified length with `step=width(i)/length`.
+"""
+range(i::TypedEndpointsInterval{:closed,:open}; length::Integer) =
+    range(leftendpoint(i); step=width(i)/length, length=length)
+range(i::TypedEndpointsInterval{:closed,:open}, len::Integer) = range(i; length=len)
+
+
 """
    duration(iv)
 

test/runtests.jl

@@ -697,6 +697,14 @@ struct IncompleteInterval <: AbstractInterval{Int} end
         @test Base.Slice(1..5) == Base.Slice{UnitRange{Int}}(1..5) == Base.Slice(1:5)
     end
 
+    @testset "range" begin
+        @test range(0..1, 10) == range(0; stop=1, length=10)
+        @test range(0..1; length=10) == range(0; stop=1, length=10)
+        @test range(0..1; step=1/10) == range(0; stop=1, step=1/10)
+        @test range(Interval{:closed,:open}(0..1), 10) == range(0; step=1/10, length=10)
+        @test range(Interval{:closed,:open}(0..1); length=10) == range(0; step=1/10, length=10)
+    end
+
     @testset "IteratorSize" begin
         @test Base.IteratorSize(ClosedInterval) == Base.SizeUnknown()
     end