range: add some nitunit and examples

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/lib/standard/collection/range.nit b/lib/standard/collection/range.nit
index d59c86e..d187cfb 100644 (file)
--- a/lib/standard/collection/range.nit
+++ b/lib/standard/collection/range.nit
@@ -27,10 +27,17 @@ class Range[E: Discrete]
        # Get the element after the last one.
        var after: E
 
+       #     assert [1..10].has(5)
+       #     assert [1..10].has(10)
+       #     assert not [1..10[.has(10)
        redef fun has(item) do return item >= first and item <= last
 
+       #     assert [1..1].has_only(1)
+       #     assert not [1..10].has_only(1)
        redef fun has_only(item) do return first == item and item == last or is_empty
 
+       #     assert [1..10].count(1)   == 1
+       #     assert [1..10].count(0)   == 0
        redef fun count(item)
        do
                if has(item) then
@@ -52,10 +59,18 @@ class Range[E: Discrete]
                end
        end
 
+       #     assert not [1..10[.is_empty
+       #     assert not [1..1].is_empty
+       #     assert [1..-10].is_empty
        redef fun is_empty do return first >= after
 
        # Create a range [`from`, `to`].
        # The syntax `[from..to]` is equivalent.
+       #
+       #     var a = [10..15]
+       #     var b = new Range[Int] (10,15)
+       #     assert a == b
+       #     assert a.to_a == [10, 11, 12, 13, 14, 15]
        init(from: E, to: E) is old_style_init do
                first = from
                last = to
@@ -64,6 +79,11 @@ class Range[E: Discrete]
 
        # Create a range [`from`, `to`[.
        # The syntax `[from..to[` is equivalent.
+       #
+       #     var a = [10..15[
+       #     var b = new Range[Int].without_last(10,15)
+       #     assert a == b
+       #     assert a.to_a == [10, 11, 12, 13, 14]
        init without_last(from: E, to: E)
        do
                first = from