mirror of
https://github.com/jashkenas/coffeescript.git
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244 lines
5.7 KiB
CoffeeScript
244 lines
5.7 KiB
CoffeeScript
# Range Literals
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# --------------
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# TODO: add indexing and method invocation tests: [1..4][0] is 1, [0...3].toString()
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# shared array
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shared = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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test "basic inclusive ranges", ->
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arrayEq [1, 2, 3] , [1..3]
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arrayEq [0, 1, 2] , [0..2]
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arrayEq [0, 1] , [0..1]
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arrayEq [0] , [0..0]
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arrayEq [-1] , [-1..-1]
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arrayEq [-1, 0] , [-1..0]
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arrayEq [-1, 0, 1], [-1..1]
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test "basic exclusive ranges", ->
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arrayEq [1, 2, 3] , [1...4]
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arrayEq [0, 1, 2] , [0...3]
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arrayEq [0, 1] , [0...2]
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arrayEq [0] , [0...1]
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arrayEq [-1] , [-1...0]
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arrayEq [-1, 0] , [-1...1]
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arrayEq [-1, 0, 1], [-1...2]
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arrayEq [], [1...1]
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arrayEq [], [0...0]
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arrayEq [], [-1...-1]
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# Should not trigger implicit call, e.g. rest ... => rest(...)
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arrayEq [1, 2, 3] , [1 ... 4]
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arrayEq [0, 1, 2] , [0 ... 3]
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arrayEq [0, 1] , [0 ... 2]
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arrayEq [0] , [0 ... 1]
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arrayEq [-1] , [-1 ... 0]
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arrayEq [-1, 0] , [-1 ... 1]
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arrayEq [-1, 0, 1], [-1 ... 2]
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arrayEq [], [1 ... 1]
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arrayEq [], [0 ... 0]
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arrayEq [], [-1 ... -1]
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test "downward ranges", ->
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arrayEq shared, [9..0].reverse()
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arrayEq [5, 4, 3, 2] , [5..2]
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arrayEq [2, 1, 0, -1], [2..-1]
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arrayEq [3, 2, 1] , [3..1]
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arrayEq [2, 1, 0] , [2..0]
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arrayEq [1, 0] , [1..0]
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arrayEq [0] , [0..0]
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arrayEq [-1] , [-1..-1]
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arrayEq [0, -1] , [0..-1]
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arrayEq [1, 0, -1] , [1..-1]
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arrayEq [0, -1, -2], [0..-2]
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arrayEq [4, 3, 2], [4...1]
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arrayEq [3, 2, 1], [3...0]
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arrayEq [2, 1] , [2...0]
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arrayEq [1] , [1...0]
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arrayEq [] , [0...0]
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arrayEq [] , [-1...-1]
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arrayEq [0] , [0...-1]
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arrayEq [0, -1] , [0...-2]
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arrayEq [1, 0] , [1...-1]
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arrayEq [2, 1, 0], [2...-1]
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test "ranges with variables as enpoints", ->
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[a, b] = [1, 3]
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arrayEq [1, 2, 3], [a..b]
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arrayEq [1, 2] , [a...b]
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b = -2
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arrayEq [1, 0, -1, -2], [a..b]
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arrayEq [1, 0, -1] , [a...b]
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test "ranges with expressions as endpoints", ->
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[a, b] = [1, 3]
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arrayEq [2, 3, 4, 5, 6], [(a+1)..2*b]
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arrayEq [2, 3, 4, 5] , [(a+1)...2*b]
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# Should not trigger implicit call, e.g. rest ... => rest(...)
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arrayEq [2, 3, 4, 5] , [(a+1) ... 2*b]
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test "large ranges are generated with looping constructs", ->
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down = [99..0]
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eq 100, (len = down.length)
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eq 0, down[len - 1]
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up = [0...100]
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eq 100, (len = up.length)
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eq 99, up[len - 1]
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test "for-from loops over ranges", ->
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array1 = []
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for x from [20..30]
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array1.push(x)
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break if x is 25
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arrayEq array1, [20, 21, 22, 23, 24, 25]
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test "for-from comprehensions over ranges", ->
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array1 = (x + 10 for x from [20..25])
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ok array1.join(' ') is '30 31 32 33 34 35'
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array2 = (x for x from [20..30] when x %% 2 == 0)
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ok array2.join(' ') is '20 22 24 26 28 30'
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test "#1012 slices with arguments object", ->
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expected = [0..9]
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argsAtStart = (-> [arguments[0]..9]) 0
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arrayEq expected, argsAtStart
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argsAtEnd = (-> [0..arguments[0]]) 9
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arrayEq expected, argsAtEnd
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argsAtBoth = (-> [arguments[0]..arguments[1]]) 0, 9
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arrayEq expected, argsAtBoth
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test "#1409: creating large ranges outside of a function body", ->
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CoffeeScript.eval '[0..100]'
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test "#2047: Infinite loop possible when `for` loop with `range` uses variables", ->
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up = 1
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down = -1
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a = 1
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b = 5
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testRange = (arg) ->
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[from, to, step, expectedResult] = arg
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r = (x for x in [from..to] by step)
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arrayEq r, expectedResult
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testData = [
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[1, 5, 1, [1..5]]
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[1, 5, -1, []]
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[1, 5, up, [1..5]]
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[1, 5, down, []]
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[a, 5, 1, [1..5]]
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[a, 5, -1, []]
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[a, 5, up, [1..5]]
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[a, 5, down, []]
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[1, b, 1, [1..5]]
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[1, b, -1, []]
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[1, b, up, [1..5]]
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[1, b, down, []]
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[a, b, 1, [1..5]]
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[a, b, -1, []]
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[a, b, up, [1..5]]
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[a, b, down, []]
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[5, 1, 1, []]
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[5, 1, -1, [5..1]]
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[5, 1, up, []]
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[5, 1, down, [5..1]]
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[5, a, 1, []]
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[5, a, -1, [5..1]]
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[5, a, up, []]
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[5, a, down, [5..1]]
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[b, 1, 1, []]
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[b, 1, -1, [5..1]]
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[b, 1, up, []]
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[b, 1, down, [5..1]]
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[b, a, 1, []]
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[b, a, -1, [5..1]]
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[b, a, up, []]
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[b, a, down, [5..1]]
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]
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testRange d for d in testData
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test "#2047: from, to and step as variables", ->
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up = 1
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down = -1
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a = 1
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b = 5
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r = (x for x in [a..b] by up)
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arrayEq r, [1..5]
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r = (x for x in [a..b] by down)
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arrayEq r, []
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r = (x for x in [b..a] by up)
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arrayEq r, []
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r = (x for x in [b..a] by down)
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arrayEq r, [5..1]
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a = 1
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b = -1
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step = 0
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r = (x for x in [b..a] by step)
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arrayEq r, []
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test "#4884: Range not declaring var for the 'i'", ->
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'use strict'
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[0..21].forEach (idx) ->
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idx + 1
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eq global.i, undefined
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test "#4889: `for` loop unexpected behavior", ->
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n = 1
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result = []
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for i in [0..n]
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result.push i
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for j in [(i+1)..n]
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result.push j
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arrayEq result, [0,1,1,2,1]
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test "#4889: `for` loop unexpected behavior with `by 1` on second loop", ->
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n = 1
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result = []
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for i in [0..n]
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result.push i
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for j in [(i+1)..n] by 1
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result.push j
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arrayEq result, [0,1,1]
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test "countdown example from docs", ->
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countdown = (num for num in [10..1])
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arrayEq countdown, [10,9,8,7,6,5,4,3,2,1]
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test "counting up when the range goes down returns an empty array", ->
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countdown = (num for num in [10..1] by 1)
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arrayEq countdown, []
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test "counting down when the range goes up returns an empty array", ->
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countup = (num for num in [1..10] by -1)
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arrayEq countup, []
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test "counting down by too much returns just the first value", ->
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countdown = (num for num in [10..1] by -100)
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arrayEq countdown, [10]
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test "counting up by too much returns just the first value", ->
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countup = (num for num in [1..10] by 100)
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arrayEq countup, [1]
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