Fix #2. Finish implementing Range.

Covers error and edge cases and fully tested now.

test/range/exclusive_range_wrong_rhs_type.wren

@@ -0,0 +1 @@
+1..."s" // expect runtime error: Right hand side of range must be a number.

test/range/floating_point.wren

@@ -0,0 +1,31 @@
+// Ordered range.
+IO.print((2..5).from) // expect: 2
+IO.print((3..3).from) // expect: 3
+IO.print((0..3).from) // expect: 0
+IO.print((-5..3).from) // expect: -5
+IO.print((-5..-2).from) // expect: -5
+
+// Backwards range.
+IO.print((5..2).from) // expect: 5
+IO.print((3..0).from) // expect: 3
+IO.print((3..-5).from) // expect: 3
+IO.print((-2..-5).from) // expect: -2
+
+// Exclusive ordered range.
+IO.print((2...5).from) // expect: 2
+IO.print((3...3).from) // expect: 3
+IO.print((0...3).from) // expect: 0
+IO.print((-5...3).from) // expect: -5
+IO.print((-5...-2).from) // expect: -5
+
+// Exclusive backwards range.
+IO.print((5...2).from) // expect: 5
+IO.print((3...0).from) // expect: 3
+IO.print((3...-5).from) // expect: 3
+IO.print((-2...-5).from) // expect: -2
+
+// TODO: Test toString.
+// TODO: Non-number RHS.
+// TODO: Non-integer RHS.
+// TODO: Range iteration.
+// TODO: Empty or negative ranges.

test/range/from.wren

@@ -23,9 +23,3 @@ IO.print((5...2).from) // expect: 5
 IO.print((3...0).from) // expect: 3
 IO.print((3...-5).from) // expect: 3
 IO.print((-2...-5).from) // expect: -2
-
-// TODO: Test toString.
-// TODO: Non-number RHS.
-// TODO: Non-integer RHS.
-// TODO: Range iteration.
-// TODO: Empty or negative ranges.

test/range/inclusive_range_wrong_rhs_type.wren

@@ -0,0 +1 @@
+1.."s" // expect runtime error: Right hand side of range must be a number.

test/range/is_inclusive.wren

@@ -0,0 +1,5 @@
+IO.print((0..0).isInclusive) // expect: true
+IO.print((0...0).isInclusive) // expect: false
+
+IO.print((-1..1).isInclusive) // expect: true
+IO.print((-1...1).isInclusive) // expect: false

test/range/iterate.wren

@@ -1,3 +1,4 @@
+// Inclusive.
 var range = 1..3
 IO.print(range.iterate(null)) // expect: 1
 IO.print(range.iterate(1)) // expect: 2
@@ -5,4 +6,30 @@ IO.print(range.iterate(2)) // expect: 3
 IO.print(range.iterate(3)) // expect: false
 IO.print(range.iterate(4)) // expect: false
 
-// TODO: Negative and empty ranges.
+// Exclusive
+range = 1...3
+IO.print(range.iterate(null)) // expect: 1
+IO.print(range.iterate(1)) // expect: 2
+IO.print(range.iterate(2)) // expect: false
+
+// Negative inclusive range.
+range = 3..1
+IO.print(range.iterate(null)) // expect: 3
+IO.print(range.iterate(3)) // expect: 2
+IO.print(range.iterate(2)) // expect: 1
+IO.print(range.iterate(1)) // expect: false
+
+// Negative exclusive range.
+range = 3...1
+IO.print(range.iterate(null)) // expect: 3
+IO.print(range.iterate(3)) // expect: 2
+IO.print(range.iterate(2)) // expect: false
+
+// Empty inclusive range.
+range = 1..1
+IO.print(range.iterate(null)) // expect: 1
+IO.print(range.iterate(1)) // expect: false
+
+// Empty exclusive range.
+range = 1...1
+IO.print(range.iterate(null)) // expect: false

test/range/iterate_from_float.wren

@@ -0,0 +1,18 @@
+// Starts at "from" and adds 1.0 each iteration.
+
+for (n in 1.3..4.5) IO.print(n)
+// expect: 1.3
+// expect: 2.3
+// expect: 3.3
+// expect: 4.3
+
+for (n in 1.3...4.5) IO.print(n)
+// expect: 1.3
+// expect: 2.3
+// expect: 3.3
+// expect: 4.3
+
+for (n in 1.3...4.3) IO.print(n)
+// expect: 1.3
+// expect: 2.3
+// expect: 3.3

test/range/max.wren

@@ -12,11 +12,11 @@ IO.print((3..-5).max) // expect: 3
 IO.print((-2..-5).max) // expect: -2
 
 // Exclusive ordered range.
-IO.print((2...5).max) // expect: 4
+IO.print((2...5).max) // expect: 5
 IO.print((3...3).max) // expect: 3
-IO.print((0...3).max) // expect: 2
-IO.print((-5...3).max) // expect: 2
-IO.print((-5...-2).max) // expect: -3
+IO.print((0...3).max) // expect: 3
+IO.print((-5...3).max) // expect: 3
+IO.print((-5...-2).max) // expect: -2
 
 // Exclusive backwards range.
 IO.print((5...2).max) // expect: 5

test/range/min.wren

@@ -13,14 +13,13 @@ IO.print((-2..-5).min) // expect: -5
 
 // Exclusive ordered range.
 IO.print((2...5).min) // expect: 2
-IO.print((3...3).min) // expect: 2
+IO.print((3...3).min) // expect: 3
 IO.print((0...3).min) // expect: 0
 IO.print((-5...3).min) // expect: -5
 IO.print((-5...-2).min) // expect: -5
 
 // Exclusive backwards range.
-// TODO: Is this what we want? "..." always means "subtract 1"?
-IO.print((5...2).min) // expect: 1
-IO.print((3...0).min) // expect: -1
-IO.print((3...-5).min) // expect: -6
-IO.print((-2...-5).min) // expect: -6
+IO.print((5...2).min) // expect: 2
+IO.print((3...0).min) // expect: 0
+IO.print((3...-5).min) // expect: -5
+IO.print((-2...-5).min) // expect: -5

test/range/to.wren

@@ -12,14 +12,14 @@ IO.print((3..-5).to) // expect: -5
 IO.print((-2..-5).to) // expect: -5
 
 // Exclusive ordered range.
-IO.print((2...5).to) // expect: 4
-IO.print((3...3).to) // expect: 2
-IO.print((0...3).to) // expect: 2
-IO.print((-5...3).to) // expect: 2
-IO.print((-5...-2).to) // expect: -3
+IO.print((2...5).to) // expect: 5
+IO.print((3...3).to) // expect: 3
+IO.print((0...3).to) // expect: 3
+IO.print((-5...3).to) // expect: 3
+IO.print((-5...-2).to) // expect: -2
 
 // Exclusive backwards range.
-IO.print((5...2).to) // expect: 1
-IO.print((3...0).to) // expect: -1
-IO.print((3...-5).to) // expect: -6
-IO.print((-2...-5).to) // expect: -6
+IO.print((5...2).to) // expect: 2
+IO.print((3...0).to) // expect: 0
+IO.print((3...-5).to) // expect: -5
+IO.print((-2...-5).to) // expect: -5

test/range/to_string.wren

@@ -0,0 +1,7 @@
+IO.print(1..3) // expect: 1..3
+IO.print(12345.6789..12345.6789) // expect: 12345.6789..12345.6789
+IO.print(-100..-300) // expect: -100..-300
+
+IO.print(1...3) // expect: 1...3
+IO.print(12345.6789...12345.6789) // expect: 12345.6789...12345.6789
+IO.print(-100...-300) // expect: -100...-300