mirror of
https://github.com/jashkenas/coffeescript.git
synced 2022-11-09 12:23:24 -05:00
871079b25c
* object rest/spread * merge branch 'master' into 'object_rest_spread' * explore * Revert "merge branch 'master' into 'object_rest_spread'" This reverts commiteeeffef55d. * Revert "explore" This reverts commitd21cd72aa3. * split tests * improvements * unassignable rest property * cleanup * formatting, cleanup * handle non-final object-destructured splat * merge with @helixbass's branch
495 lines
13 KiB
CoffeeScript
495 lines
13 KiB
CoffeeScript
# Function Literals
|
||
# -----------------
|
||
|
||
# TODO: add indexing and method invocation tests: (->)[0], (->).call()
|
||
|
||
# * Function Definition
|
||
# * Bound Function Definition
|
||
# * Parameter List Features
|
||
# * Splat Parameters
|
||
# * Context (@) Parameters
|
||
# * Parameter Destructuring
|
||
# * Default Parameters
|
||
|
||
# Function Definition
|
||
|
||
x = 1
|
||
y = {}
|
||
y.x = -> 3
|
||
ok x is 1
|
||
ok typeof(y.x) is 'function'
|
||
ok y.x instanceof Function
|
||
ok y.x() is 3
|
||
|
||
# The empty function should not cause a syntax error.
|
||
->
|
||
() ->
|
||
|
||
# Multiple nested function declarations mixed with implicit calls should not
|
||
# cause a syntax error.
|
||
(one) -> (two) -> three four, (five) -> six seven, eight, (nine) ->
|
||
|
||
# with multiple single-line functions on the same line.
|
||
func = (x) -> (x) -> (x) -> x
|
||
ok func(1)(2)(3) is 3
|
||
|
||
# Make incorrect indentation safe.
|
||
func = ->
|
||
obj = {
|
||
key: 10
|
||
}
|
||
obj.key - 5
|
||
eq func(), 5
|
||
|
||
# Ensure that functions with the same name don't clash with helper functions.
|
||
del = -> 5
|
||
ok del() is 5
|
||
|
||
|
||
# Bound Function Definition
|
||
|
||
obj =
|
||
bound: ->
|
||
(=> this)()
|
||
unbound: ->
|
||
(-> this)()
|
||
nested: ->
|
||
(=>
|
||
(=>
|
||
(=> this)()
|
||
)()
|
||
)()
|
||
eq obj, obj.bound()
|
||
ok obj isnt obj.unbound()
|
||
eq obj, obj.nested()
|
||
|
||
|
||
test "even more fancy bound functions", ->
|
||
obj =
|
||
one: ->
|
||
do =>
|
||
return this.two()
|
||
two: ->
|
||
do =>
|
||
do =>
|
||
do =>
|
||
return this.three
|
||
three: 3
|
||
|
||
eq obj.one(), 3
|
||
|
||
|
||
test "arguments in bound functions inherit from parent function", ->
|
||
# The `arguments` object in an ES arrow function refers to the `arguments`
|
||
# of the parent scope, just like `this`. In the CoffeeScript 1.x
|
||
# implementation of `=>`, the `arguments` object referred to the arguments
|
||
# of the arrow function; but per the ES2015 spec, `arguments` should refer
|
||
# to the parent.
|
||
arrayEq ((a...) -> a)([1, 2, 3]), ((a...) => a)([1, 2, 3])
|
||
|
||
parent = (a, b, c) ->
|
||
(bound = =>
|
||
[arguments[0], arguments[1], arguments[2]]
|
||
)()
|
||
arrayEq [1, 2, 3], parent(1, 2, 3)
|
||
|
||
|
||
test "self-referencing functions", ->
|
||
changeMe = ->
|
||
changeMe = 2
|
||
|
||
changeMe()
|
||
eq changeMe, 2
|
||
|
||
|
||
# Parameter List Features
|
||
|
||
test "splats", ->
|
||
arrayEq [0, 1, 2], (((splat...) -> splat) 0, 1, 2)
|
||
arrayEq [2, 3], (((_, _1, splat...) -> splat) 0, 1, 2, 3)
|
||
arrayEq [0, 1], (((splat..., _, _1) -> splat) 0, 1, 2, 3)
|
||
arrayEq [2], (((_, _1, splat..., _2) -> splat) 0, 1, 2, 3)
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
arrayEq [0, 1, 2], (((splat ...) -> splat) 0, 1, 2)
|
||
arrayEq [2, 3], (((_, _1, splat ...) -> splat) 0, 1, 2, 3)
|
||
arrayEq [0, 1], (((splat ..., _, _1) -> splat) 0, 1, 2, 3)
|
||
arrayEq [2], (((_, _1, splat ..., _2) -> splat) 0, 1, 2, 3)
|
||
|
||
test "destructured splatted parameters", ->
|
||
arr = [0,1,2]
|
||
splatArray = ([a...]) -> a
|
||
splatArrayRest = ([a...],b...) -> arrayEq(a,b); b
|
||
arrayEq splatArray(arr), arr
|
||
arrayEq splatArrayRest(arr,0,1,2), arr
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
splatArray = ([a ...]) -> a
|
||
splatArrayRest = ([a ...],b ...) -> arrayEq(a,b); b
|
||
|
||
test "#4884: object-destructured splatted parameters", ->
|
||
f = ({length}...) -> length
|
||
eq f(4, 5, 6), 3
|
||
f = ({length: len}...) -> len
|
||
eq f(4, 5, 6), 3
|
||
f = ({length}..., last) -> [length, last]
|
||
arrayEq f(4, 5, 6), [2, 6]
|
||
f = ({length: len}..., last) -> [len, last]
|
||
arrayEq f(4, 5, 6), [2, 6]
|
||
|
||
test "@-parameters: automatically assign an argument's value to a property of the context", ->
|
||
nonce = {}
|
||
|
||
((@prop) ->).call context = {}, nonce
|
||
eq nonce, context.prop
|
||
|
||
# Allow splats alongside the special argument
|
||
((splat..., @prop) ->).apply context = {}, [0, 0, nonce]
|
||
eq nonce, context.prop
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
((splat ..., @prop) ->).apply context = {}, [0, 0, nonce]
|
||
eq nonce, context.prop
|
||
|
||
# Allow the argument itself to be a splat
|
||
((@prop...) ->).call context = {}, 0, nonce, 0
|
||
eq nonce, context.prop[1]
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
((@prop ...) ->).call context = {}, 0, nonce, 0
|
||
eq nonce, context.prop[1]
|
||
|
||
# The argument should not be able to be referenced normally
|
||
code = '((@prop) -> prop).call {}'
|
||
doesNotThrow -> CoffeeScript.compile code
|
||
throws (-> CoffeeScript.run code), ReferenceError
|
||
code = '((@prop) -> _at_prop).call {}'
|
||
doesNotThrow -> CoffeeScript.compile code
|
||
throws (-> CoffeeScript.run code), ReferenceError
|
||
|
||
test "@-parameters and splats with constructors", ->
|
||
a = {}
|
||
b = {}
|
||
class Klass
|
||
constructor: (@first, splat..., @last) ->
|
||
|
||
obj = new Klass a, 0, 0, b
|
||
eq a, obj.first
|
||
eq b, obj.last
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
class Klass
|
||
constructor: (@first, splat ..., @last) ->
|
||
|
||
obj = new Klass a, 0, 0, b
|
||
eq a, obj.first
|
||
eq b, obj.last
|
||
|
||
test "destructuring in function definition", ->
|
||
(([{a: [b], c}]...) ->
|
||
eq 1, b
|
||
eq 2, c
|
||
) {a: [1], c: 2}
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
(([{a: [b], c}] ...) ->
|
||
eq 1, b
|
||
eq 2, c
|
||
) {a: [1], c: 2}
|
||
|
||
context = {}
|
||
(([{a: [b, c = 2], @d, e = 4}]...) ->
|
||
eq 1, b
|
||
eq 2, c
|
||
eq @d, 3
|
||
eq context.d, 3
|
||
eq e, 4
|
||
).call context, {a: [1], d: 3}
|
||
|
||
(({a: aa = 1, b: bb = 2}) ->
|
||
eq 5, aa
|
||
eq 2, bb
|
||
) {a: 5}
|
||
|
||
ajax = (url, {
|
||
async = true,
|
||
beforeSend = (->),
|
||
cache = true,
|
||
method = 'get',
|
||
data = {}
|
||
}) ->
|
||
{url, async, beforeSend, cache, method, data}
|
||
|
||
fn = ->
|
||
deepEqual ajax('/home', beforeSend: fn, method: 'post'), {
|
||
url: '/home', async: true, beforeSend: fn, cache: true, method: 'post', data: {}
|
||
}
|
||
|
||
test "#4005: `([a = {}]..., b) ->` weirdness", ->
|
||
fn = ([a = {}]..., b) -> [a, b]
|
||
deepEqual fn(5), [{}, 5]
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
fn = ([a = {}] ..., b) -> [a, b]
|
||
deepEqual fn(5), [{}, 5]
|
||
|
||
test "default values", ->
|
||
nonceA = {}
|
||
nonceB = {}
|
||
a = (_,_1,arg=nonceA) -> arg
|
||
eq nonceA, a()
|
||
eq nonceA, a(0)
|
||
eq nonceB, a(0,0,nonceB)
|
||
eq nonceA, a(0,0,undefined)
|
||
eq null, a(0,0,null) # Per ES2015, `null` doesn’t trigger a parameter default value
|
||
eq false , a(0,0,false)
|
||
eq nonceB, a(undefined,undefined,nonceB,undefined)
|
||
b = (_,arg=nonceA,_1,_2) -> arg
|
||
eq nonceA, b()
|
||
eq nonceA, b(0)
|
||
eq nonceB, b(0,nonceB)
|
||
eq nonceA, b(0,undefined)
|
||
eq null, b(0,null)
|
||
eq false , b(0,false)
|
||
eq nonceB, b(undefined,nonceB,undefined)
|
||
c = (arg=nonceA,_,_1) -> arg
|
||
eq nonceA, c()
|
||
eq 0, c(0)
|
||
eq nonceB, c(nonceB)
|
||
eq nonceA, c(undefined)
|
||
eq null, c(null)
|
||
eq false , c(false)
|
||
eq nonceB, c(nonceB,undefined,undefined)
|
||
|
||
test "default values with @-parameters", ->
|
||
a = {}
|
||
b = {}
|
||
obj = f: (q = a, @p = b) -> q
|
||
eq a, obj.f()
|
||
eq b, obj.p
|
||
|
||
test "default values with splatted arguments", ->
|
||
withSplats = (a = 2, b..., c = 3, d = 5) -> a * (b.length + 1) * c * d
|
||
eq 30, withSplats()
|
||
eq 15, withSplats(1)
|
||
eq 5, withSplats(1,1)
|
||
eq 1, withSplats(1,1,1)
|
||
eq 2, withSplats(1,1,1,1)
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
withSplats = (a = 2, b ..., c = 3, d = 5) -> a * (b.length + 1) * c * d
|
||
eq 30, withSplats()
|
||
eq 15, withSplats(1)
|
||
eq 5, withSplats(1,1)
|
||
eq 1, withSplats(1,1,1)
|
||
eq 2, withSplats(1,1,1,1)
|
||
|
||
test "#156: parameter lists with expansion", ->
|
||
expandArguments = (first, ..., lastButOne, last) ->
|
||
eq 1, first
|
||
eq 4, lastButOne
|
||
last
|
||
eq 5, expandArguments 1, 2, 3, 4, 5
|
||
|
||
throws (-> CoffeeScript.compile "(..., a, b...) ->"), null, "prohibit expansion and a splat"
|
||
throws (-> CoffeeScript.compile "(...) ->"), null, "prohibit lone expansion"
|
||
|
||
test "#156: parameter lists with expansion in array destructuring", ->
|
||
expandArray = (..., [..., last]) ->
|
||
last
|
||
eq 3, expandArray 1, 2, 3, [1, 2, 3]
|
||
|
||
test "#3502: variable definitions and expansion", ->
|
||
a = b = 0
|
||
f = (a, ..., b) -> [a, b]
|
||
arrayEq [1, 5], f 1, 2, 3, 4, 5
|
||
eq 0, a
|
||
eq 0, b
|
||
|
||
test "variable definitions and splat", ->
|
||
a = b = 0
|
||
f = (a, middle..., b) -> [a, middle, b]
|
||
arrayEq [1, [2, 3, 4], 5], f 1, 2, 3, 4, 5
|
||
eq 0, a
|
||
eq 0, b
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
f = (a, middle ..., b) -> [a, middle, b]
|
||
arrayEq [1, [2, 3, 4], 5], f 1, 2, 3, 4, 5
|
||
eq 0, a
|
||
eq 0, b
|
||
|
||
test "default values with function calls", ->
|
||
doesNotThrow -> CoffeeScript.compile "(x = f()) ->"
|
||
|
||
test "arguments vs parameters", ->
|
||
doesNotThrow -> CoffeeScript.compile "f(x) ->"
|
||
f = (g) -> g()
|
||
eq 5, f (x) -> 5
|
||
|
||
test "reserved keyword as parameters", ->
|
||
f = (_case, @case) -> [_case, @case]
|
||
[a, b] = f(1, 2)
|
||
eq 1, a
|
||
eq 2, b
|
||
|
||
f = (@case, _case...) -> [@case, _case...]
|
||
[a, b, c] = f(1, 2, 3)
|
||
eq 1, a
|
||
eq 2, b
|
||
eq 3, c
|
||
|
||
test "reserved keyword at-splat", ->
|
||
f = (@case...) -> @case
|
||
[a, b] = f(1, 2)
|
||
eq 1, a
|
||
eq 2, b
|
||
|
||
# Should not trigger implicit call, e.g. rest ... => rest(...)
|
||
f = (@case ...) -> @case
|
||
[a, b] = f(1, 2)
|
||
eq 1, a
|
||
eq 2, b
|
||
|
||
test "#1574: Destructuring and a parameter named _arg", ->
|
||
f = ({a, b}, _arg, _arg1) -> [a, b, _arg, _arg1]
|
||
arrayEq [1, 2, 3, 4], f a: 1, b: 2, 3, 4
|
||
|
||
test "#1844: bound functions in nested comprehensions causing empty var statements", ->
|
||
a = ((=>) for a in [0] for b in [0])
|
||
eq 1, a.length
|
||
|
||
test "#1859: inline function bodies shouldn't modify prior postfix ifs", ->
|
||
list = [1, 2, 3]
|
||
ok true if list.some (x) -> x is 2
|
||
|
||
test "#2258: allow whitespace-style parameter lists in function definitions", ->
|
||
func = (
|
||
a, b, c
|
||
) -> c
|
||
eq func(1, 2, 3), 3
|
||
|
||
func = (
|
||
a
|
||
b
|
||
c
|
||
) -> b
|
||
eq func(1, 2, 3), 2
|
||
|
||
test "#2621: fancy destructuring in parameter lists", ->
|
||
func = ({ prop1: { key1 }, prop2: { key2, key3: [a, b, c] } }) ->
|
||
eq(key2, 'key2')
|
||
eq(a, 'a')
|
||
|
||
func({prop1: {key1: 'key1'}, prop2: {key2: 'key2', key3: ['a', 'b', 'c']}})
|
||
|
||
test "#1435 Indented property access", ->
|
||
rec = -> rec: rec
|
||
|
||
eq 1, do ->
|
||
rec()
|
||
.rec ->
|
||
rec()
|
||
.rec ->
|
||
rec.rec()
|
||
.rec()
|
||
1
|
||
|
||
test "#1038 Optimize trailing return statements", ->
|
||
compile = (code) -> CoffeeScript.compile(code, bare: yes).trim().replace(/\s+/g, " ")
|
||
|
||
eq "(function() {});", compile("->")
|
||
eq "(function() {});", compile("-> return")
|
||
eq "(function() { return void 0; });", compile("-> undefined")
|
||
eq "(function() { return void 0; });", compile("-> return undefined")
|
||
eq "(function() { foo(); });", compile("""
|
||
->
|
||
foo()
|
||
return
|
||
""")
|
||
|
||
test "#4406 Destructured parameter default evaluation order with incrementing variable", ->
|
||
i = 0
|
||
f = ({ a = ++i }, b = ++i) -> [a, b]
|
||
arrayEq f({}), [1, 2]
|
||
|
||
test "#4406 Destructured parameter default evaluation order with generator function", ->
|
||
current = 0
|
||
next = -> ++current
|
||
foo = ({ a = next() }, b = next()) -> [ a, b ]
|
||
arrayEq foo({}), [1, 2]
|
||
|
||
test "Destructured parameter with default value, that itself has a default value", ->
|
||
# Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment
|
||
draw = ({size = 'big', coords = {x: 0, y: 0}, radius = 25} = {}) -> "#{size}-#{coords.x}-#{coords.y}-#{radius}"
|
||
output = draw
|
||
coords:
|
||
x: 18
|
||
y: 30
|
||
radius: 30
|
||
eq output, 'big-18-30-30'
|
||
|
||
test "#4566: destructuring with nested default values", ->
|
||
f = ({a: {b = 1}}) ->
|
||
b
|
||
eq 2, f a: b: 2
|
||
|
||
test "#1043: comma after function glyph", ->
|
||
x = (a=->, b=2) ->
|
||
a()
|
||
eq x(), undefined
|
||
|
||
f = (a) -> a()
|
||
g = f ->, 2
|
||
eq g, undefined
|
||
h = f(=>, 2)
|
||
eq h, undefined
|
||
|
||
test "#3845/#3446: chain after function glyph", ->
|
||
angular = module: -> controller: -> controller: ->
|
||
|
||
eq undefined,
|
||
angular.module 'foo'
|
||
.controller 'EmailLoginCtrl', ->
|
||
.controller 'EmailSignupCtrl', ->
|
||
|
||
beforeEach = (f) -> f()
|
||
getPromise = -> then: -> catch: ->
|
||
|
||
eq undefined,
|
||
beforeEach ->
|
||
getPromise()
|
||
.then (@result) =>
|
||
.catch (@error) =>
|
||
|
||
doThing = -> then: -> catch: (f) -> f()
|
||
handleError = -> 3
|
||
eq 3,
|
||
doThing()
|
||
.then (@result) =>
|
||
.catch handleError
|
||
|
||
test "#4413: expressions in function parameters that create generated variables have those variables declared correctly", ->
|
||
'use strict'
|
||
# We’re in strict mode because we want an error to be thrown if the generated
|
||
# variable (`ref`) is assigned before being declared.
|
||
foo = -> null
|
||
bar = -> 33
|
||
f = (a = foo() ? bar()) -> a
|
||
g = (a = foo() ? bar()) -> a + 1
|
||
eq f(), 33
|
||
eq g(), 34
|
||
|
||
test "#4657: destructured array param declarations", ->
|
||
a = 1
|
||
b = 2
|
||
f = ([a..., b]) ->
|
||
f [3, 4, 5]
|
||
eq a, 1
|
||
eq b, 2
|
||
|
||
test "#4657: destructured array parameters", ->
|
||
f = ([a..., b]) -> {a, b}
|
||
result = f [1, 2, 3, 4]
|
||
arrayEq result.a, [1, 2, 3]
|
||
eq result.b, 4
|