mirror of
https://github.com/jashkenas/coffeescript.git
synced 2022-11-09 12:23:24 -05:00
453 lines
10 KiB
CoffeeScript
453 lines
10 KiB
CoffeeScript
# Operators
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# ---------
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# * Operators
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# * Existential Operator (Binary)
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# * Existential Operator (Unary)
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# * Aliased Operators
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# * [not] in/of
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# * Chained Comparison
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test "binary (2-ary) math operators do not require spaces", ->
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a = 1
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b = -1
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eq +1, a*-b
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eq -1, a*+b
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eq +1, a/-b
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eq -1, a/+b
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test "operators should respect new lines as spaced", ->
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a = 123 +
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456
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eq 579, a
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b = "1#{2}3" +
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"456"
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eq '123456', b
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test "multiple operators should space themselves", ->
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eq (+ +1), (- -1)
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test "compound operators on successive lines", ->
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a = 1
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a +=
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1
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eq a, 2
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test "bitwise operators", ->
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eq 2, (10 & 3)
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eq 11, (10 | 3)
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eq 9, (10 ^ 3)
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eq 80, (10 << 3)
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eq 1, (10 >> 3)
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eq 1, (10 >>> 3)
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num = 10; eq 2, (num &= 3)
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num = 10; eq 11, (num |= 3)
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num = 10; eq 9, (num ^= 3)
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num = 10; eq 80, (num <<= 3)
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num = 10; eq 1, (num >>= 3)
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num = 10; eq 1, (num >>>= 3)
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test "`instanceof`", ->
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ok new String instanceof String
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ok new Boolean instanceof Boolean
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# `instanceof` supports negation by prefixing the operator with `not`
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ok new Number not instanceof String
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ok new Array not instanceof Boolean
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test "use `::` operator on keywords `this` and `@`", ->
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nonce = {}
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obj =
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withAt: -> @::prop
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withThis: -> this::prop
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obj.prototype = prop: nonce
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eq nonce, obj.withAt()
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eq nonce, obj.withThis()
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# Existential Operator (Binary)
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test "binary existential operator", ->
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nonce = {}
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b = a ? nonce
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eq nonce, b
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a = null
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b = undefined
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b = a ? nonce
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eq nonce, b
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a = false
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b = a ? nonce
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eq false, b
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a = 0
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b = a ? nonce
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eq 0, b
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test "binary existential operator conditionally evaluates second operand", ->
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i = 1
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func = -> i -= 1
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result = func() ? func()
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eq result, 0
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test "binary existential operator with negative number", ->
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a = null ? - 1
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eq -1, a
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# Existential Operator (Unary)
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test "postfix existential operator", ->
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ok (if nonexistent? then false else true)
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defined = true
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ok defined?
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defined = false
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ok defined?
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test "postfix existential operator only evaluates its operand once", ->
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semaphore = 0
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fn = ->
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ok false if semaphore
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++semaphore
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ok(if fn()? then true else false)
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test "negated postfix existential operator", ->
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ok !nothing?.value
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test "postfix existential operator on expressions", ->
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eq true, (1 or 0)?, true
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# `is`,`isnt`,`==`,`!=`
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test "`==` and `is` should be interchangeable", ->
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a = b = 1
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ok a is 1 and b == 1
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ok a == b
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ok a is b
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test "`!=` and `isnt` should be interchangeable", ->
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a = 0
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b = 1
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ok a isnt 1 and b != 0
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ok a != b
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ok a isnt b
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# [not] in/of
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# - `in` should check if an array contains a value using `indexOf`
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# - `of` should check if a property is defined on an object using `in`
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test "in, of", ->
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arr = [1]
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ok 0 of arr
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ok 1 in arr
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# prefixing `not` to `in and `of` should negate them
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ok 1 not of arr
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ok 0 not in arr
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test "`in` should be able to operate on an array literal", ->
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ok 2 in [0, 1, 2, 3]
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ok 4 not in [0, 1, 2, 3]
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arr = [0, 1, 2, 3]
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ok 2 in arr
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ok 4 not in arr
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# should cache the value used to test the array
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arr = [0]
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val = 0
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ok val++ in arr
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ok val++ not in arr
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val = 0
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ok val++ of arr
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ok val++ not of arr
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test "`of` and `in` should be able to operate on instance variables", ->
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obj = {
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list: [2,3]
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in_list: (value) -> value in @list
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not_in_list: (value) -> value not in @list
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of_list: (value) -> value of @list
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not_of_list: (value) -> value not of @list
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}
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ok obj.in_list 3
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ok obj.not_in_list 1
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ok obj.of_list 0
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ok obj.not_of_list 2
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test "#???: `in` with cache and `__indexOf` should work in argument lists", ->
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eq 1, [Object() in Array()].length
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test "#737: `in` should have higher precedence than logical operators", ->
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eq 1, 1 in [1] and 1
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test "#768: `in` should preserve evaluation order", ->
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share = 0
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a = -> share++ if share is 0
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b = -> share++ if share is 1
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c = -> share++ if share is 2
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ok a() not in [b(),c()]
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eq 3, share
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test "#1099: empty array after `in` should compile to `false`", ->
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eq 1, [5 in []].length
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eq false, do -> return 0 in []
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test "#1354: optimized `in` checks should not happen when splats are present", ->
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a = [6, 9]
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eq 9 in [3, a...], true
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test "#1100: precedence in or-test compilation of `in`", ->
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ok 0 in [1 and 0]
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ok 0 in [1, 1 and 0]
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ok not (0 in [1, 0 or 1])
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test "#1630: `in` should check `hasOwnProperty`", ->
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ok undefined not in length: 1
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test "#1714: lexer bug with raw range `for` followed by `in`", ->
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0 for [1..2]
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ok not ('a' in ['b'])
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0 for [1..2]; ok not ('a' in ['b'])
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0 for [1..10] # comment ending
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ok not ('a' in ['b'])
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# lexer state (specifically @seenFor) should be reset before each compilation
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CoffeeScript.compile "0 for [1..2]"
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CoffeeScript.compile "'a' in ['b']"
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test "#1099: statically determined `not in []` reporting incorrect result", ->
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ok 0 not in []
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test "#1099: make sure expression tested gets evaluted when array is empty", ->
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a = 0
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(do -> a = 1) in []
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eq a, 1
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# Chained Comparison
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test "chainable operators", ->
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ok 100 > 10 > 1 > 0 > -1
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ok -1 < 0 < 1 < 10 < 100
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test "`is` and `isnt` may be chained", ->
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ok true is not false is true is not false
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ok 0 is 0 isnt 1 is 1
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test "different comparison operators (`>`,`<`,`is`,etc.) may be combined", ->
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ok 1 < 2 > 1
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ok 10 < 20 > 2+3 is 5
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test "some chainable operators can be negated by `unless`", ->
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ok (true unless 0==10!=100)
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test "operator precedence: `|` lower than `<`", ->
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eq 1, 1 | 2 < 3 < 4
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test "preserve references", ->
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a = b = c = 1
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# `a == b <= c` should become `a === b && b <= c`
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# (this test does not seem to test for this)
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ok a == b <= c
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test "chained operations should evaluate each value only once", ->
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a = 0
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ok 1 > a++ < 1
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test "#891: incorrect inversion of chained comparisons", ->
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ok (true unless 0 > 1 > 2)
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ok (true unless (this.NaN = 0/0) < 0/0 < this.NaN)
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test "#1234: Applying a splat to :: applies the splat to the wrong object", ->
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nonce = {}
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class C
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method: -> @nonce
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nonce: nonce
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arr = []
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eq nonce, C::method arr... # should be applied to `C::`
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test "#1102: String literal prevents line continuation", ->
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eq "': '", '' +
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"': '"
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test "#1703, ---x is invalid JS", ->
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x = 2
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eq (- --x), -1
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test "Regression with implicit calls against an indented assignment", ->
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eq 1, a =
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1
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eq a, 1
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test "#2155 ... conditional assignment to a closure", ->
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x = null
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func = -> x ?= (-> if true then 'hi')
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func()
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eq x(), 'hi'
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test "#2197: Existential existential double trouble", ->
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counter = 0
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func = -> counter++
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func()? ? 100
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eq counter, 1
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test "#2567: Optimization of negated existential produces correct result", ->
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a = 1
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ok !(!a?)
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ok !b?
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test "#2508: Existential access of the prototype", ->
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eq NonExistent?::nothing, undefined
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eq(
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NonExistent
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?::nothing
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undefined
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)
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ok Object?::toString
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ok(
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Object
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?::toString
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)
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test "floor division operator", ->
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eq 2, 7 // 3
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eq -3, -7 // 3
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eq NaN, 0 // 0
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test "floor division operator compound assignment", ->
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a = 7
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a //= 1 + 1
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eq 3, a
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test "modulo operator", ->
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check = (a, b, expected) ->
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eq expected, a %% b, "expected #{a} %%%% #{b} to be #{expected}"
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check 0, 1, 0
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check 0, -1, -0
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check 1, 0, NaN
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check 1, 2, 1
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check 1, -2, -1
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check 1, 3, 1
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check 2, 3, 2
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check 3, 3, 0
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check 4, 3, 1
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check -1, 3, 2
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check -2, 3, 1
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check -3, 3, 0
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check -4, 3, 2
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check 5.5, 2.5, 0.5
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check -5.5, 2.5, 2.0
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test "modulo operator compound assignment", ->
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a = -2
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a %%= 5
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eq 3, a
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test "modulo operator converts arguments to numbers", ->
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eq 1, 1 %% '42'
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eq 1, '1' %% 42
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eq 1, '1' %% '42'
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test "#3361: Modulo operator coerces right operand once", ->
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count = 0
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res = 42 %% valueOf: -> count += 1
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eq 1, count
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eq 0, res
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test "#3363: Modulo operator coercing order", ->
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count = 2
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a = valueOf: -> count *= 2
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b = valueOf: -> count += 1
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eq 4, a %% b
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eq 5, count
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test "#3598: Unary + and - coerce the operand once when it is an identifier", ->
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# Unary + and - do not generate `_ref`s when the operand is a number, for
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# readability. To make sure that they do when the operand is an identifier,
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# test that they are consistent with another unary operator as well as another
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# complex expression.
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# Tip: Making one of the tests temporarily fail lets you easily inspect the
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# compiled JavaScript.
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assertOneCoercion = (fn) ->
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count = 0
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value = valueOf: -> count++; 1
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fn value
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eq 1, count
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eq 1, 1 ? 0
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eq 1, +1 ? 0
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eq -1, -1 ? 0
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assertOneCoercion (a) ->
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eq 1, +a ? 0
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assertOneCoercion (a) ->
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eq -1, -a ? 0
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assertOneCoercion (a) ->
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eq -2, ~a ? 0
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assertOneCoercion (a) ->
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eq 0.5, a / 2 ? 0
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ok -2 <= 1 < 2
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ok -2 <= +1 < 2
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ok -2 <= -1 < 2
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assertOneCoercion (a) ->
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ok -2 <= +a < 2
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assertOneCoercion (a) ->
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ok -2 <= -a < 2
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assertOneCoercion (a) ->
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ok -2 <= ~a < 2
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assertOneCoercion (a) ->
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ok -2 <= a / 2 < 2
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arrayEq [0], (n for n in [0] by 1)
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arrayEq [0], (n for n in [0] by +1)
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arrayEq [0], (n for n in [0] by -1)
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assertOneCoercion (a) ->
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arrayEq [0], (n for n in [0] by +a)
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assertOneCoercion (a) ->
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arrayEq [0], (n for n in [0] by -a)
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assertOneCoercion (a) ->
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arrayEq [0], (n for n in [0] by ~a)
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assertOneCoercion (a) ->
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arrayEq [0], (n for n in [0] by a * 2 / 2)
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ok 1 in [0, 1]
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ok +1 in [0, 1]
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ok -1 in [0, -1]
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assertOneCoercion (a) ->
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ok +a in [0, 1]
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assertOneCoercion (a) ->
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ok -a in [0, -1]
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assertOneCoercion (a) ->
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ok ~a in [0, -2]
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assertOneCoercion (a) ->
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ok a / 2 in [0, 0.5]
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test "'new' target", ->
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nonce = {}
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ctor = -> nonce
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eq (new ctor), nonce
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eq (new ctor()), nonce
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ok new class
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ctor = class
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ok (new ctor) instanceof ctor
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ok (new ctor()) instanceof ctor
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# Force an executable class body
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ctor = class then a = 1
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ok (new ctor) instanceof ctor
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get = -> ctor
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ok (new get()) not instanceof ctor
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ok (new (get())()) instanceof ctor
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# classes must be called with `new`. In this case `new` applies to `get` only
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throws -> new get()()
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