/
classes.coffee
696 lines (555 loc) · 16.3 KB
/
classes.coffee
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suite 'Classes', ->
suite 'Class Definition', ->
test "Overriding the static property new doesn't clobber Function::new", ->
class OneClass
@new: 'new'
function: 'function'
constructor: (name) -> @name = name
class TwoClass extends OneClass
delete TwoClass.new
Function.prototype.new = -> new this arguments...
ok (TwoClass.new('three')).name is 'three'
ok (new OneClass).function is 'function'
ok OneClass.new is 'new'
delete Function.prototype.new
test.skip 'basic classes, again, but in the manual prototype style', -> # Currently syntax error.
#
# Base = ->
# Base::func = (string) ->
# 'zero/' + string
# Base::['func-func'] = (string) ->
# "dynamic-#{string}"
#
# FirstChild = ->
# SecondChild = ->
# ThirdChild = ->
# @array = [1, 2, 3]
# this
#
# ThirdChild extends SecondChild extends FirstChild extends Base
#
# FirstChild::func = (string) ->
# super('one/') + string
#
# SecondChild::func = (string) ->
# super('two/') + string
#
# ThirdChild::func = (string) ->
# super('three/') + string
#
# result = (new ThirdChild).func 'four'
#
# ok result is 'zero/one/two/three/four'
#
# ok (new ThirdChild)['func-func']('thing') is 'dynamic-thing'
test 'static assignment via colon', ->
nonce = {}
class A then @b: nonce
eq nonce, A.b
test 'classes with JS-keyword properties', ->
class Class
class: 'class'
name: -> @class
instance = new Class
ok instance.class is 'class'
ok instance.name() is 'class'
test 'nothing classes', ->
c = class
ok c instanceof Function
test 'instance-bound methods and statically-bound methods', ->
class Dog
constructor: (name) ->
@name = name
bark: =>
"#{@name} woofs!"
@static = =>
new this('Dog')
spark = new Dog('Spark')
fido = new Dog('Fido')
fido.bark = spark.bark
ok fido.bark() is 'Spark woofs!'
obj = {func: Dog.static}
ok obj.func().name is 'Dog'
test 'anonymous classes', ->
obj = klass: class
method: -> 'value'
instance = new obj.klass
ok instance.method() is 'value'
test 'Implicit objects as static properties', ->
class Static
@static =
one: 1
two: 2
ok Static.static.one is 1
ok Static.static.two is 2
test.skip 'classes with static-level implicit objects', ->
class A
@static = one: 1
two: 2
class B
@static = one: 1,
two: 2
eq A.static.one, 1
eq A.static.two, undefined
eq (new A).two, 2
eq B.static.one, 1
eq B.static.two, 2
eq (new B).two, undefined
test 'external constructors', ->
counter = 0
classMaker = ->
inner = ++counter
->
@value = inner
class One
constructor: classMaker()
class Two
constructor: classMaker()
eq (new One).value, 1
eq (new Two).value, 2
eq (new One).value, 1
eq (new Two).value, 2
test.skip 'exectuable class bodies', ->
class A
if true
b: 'b'
else
c: 'c'
a = new A
eq a.b, 'b'
eq a.c, undefined
test 'mild metaprogramming', ->
class Base
@attr = (name) ->
this::[name] = (val) ->
if arguments.length > 0
this["_#{name}"] = val
else
this["_#{name}"]
class Robot extends Base
@attr 'power'
@attr 'speed'
robby = new Robot
ok robby.power() is undefined
robby.power 11
robby.speed Infinity
eq robby.power(), 11
eq robby.speed(), Infinity
test 'namespaced classes do not reserve their function name in outside scope', ->
one = {}
two = {}
class one.Klass
@label = "one"
class two.Klass
@label = "two"
eq typeof Klass, 'undefined'
eq one.Klass.label, 'one'
eq two.Klass.label, 'two'
test 'nested classes', ->
class Outer
constructor: ->
@label = 'outer'
class @Inner
constructor: ->
@label = 'inner'
eq (new Outer).label, 'outer'
eq (new Outer.Inner).label, 'inner'
test 'variables in constructor bodies are correctly scoped', ->
class A
x = 1
constructor: ->
x = 10
y = 20
y = 2
captured: ->
{x, y}
a = new A
eq a.captured().x, 10
eq a.captured().y, 2
test 'Issue #924: Static methods in nested classes', ->
class A
@B = class
@c = -> 5
eq A.B.c(), 5
test 'jashkenas/coffee-script#1182: a subclass should be able to set its constructor to an external function', ->
ctor = ->
@val = 1
class A
class B extends A
constructor: ctor
eq (new B).val, 1
test 'jashkenas/coffee-script#1182: external constructors continued', ->
ctor = ->
class A
class B extends A
method: ->
constructor: ctor
ok B::method
test 'jashkenas/coffee-script#1182: execution order needs to be considered as well', ->
counter = 0
makeFn = (n) -> eq n, ++counter; ->
class B extends (makeFn 1)
@B = makeFn 2
constructor: makeFn 3
test 'jashkenas/coffee-script#1182: external constructors with bound functions', ->
fn = ->
{one: 1}
this
class B
class A
constructor: fn
method: => this instanceof A
ok (new A).method.call(new B)
test 'jashkenas/coffee-script#1372: bound class methods with reserved names', ->
class C
delete: =>
ok C::delete
test 'jashkenas/coffee-script#1464: bound class methods should keep context', ->
nonce = {}
class C
constructor: (id) -> @id = id
@boundStatic = => new this(nonce)
eq nonce, C.boundStatic().id
test 'jashkenas/coffee-script#1009: classes with reserved words as determined names', ->
fn = ->
eq 'function', typeof (class @for)
ok not /\seval\s?\(/.test (class @eval).toString()
ok not /\sarguments\s\(/.test (class @arguments).toString()
fn.call {}
test 'jashkenas/coffee-script#1842: Regression with bound functions within bound class methods', ->
class Store
@bound = =>
do =>
eq this, Store
Store.bound()
# And a fancier case:
class Store
eq this, Store
@bound = =>
do =>
eq this, Store
@unbound = ->
eq this, Store
instance: =>
ok this instanceof Store
Store.bound()
Store.unbound()
(new Store).instance()
test 'jashkenas/coffee-script#1813: Passing class definitions as expressions', ->
ident = (x) -> x
result = ident class A then x = 1
eq result, A
result = ident class B extends A
x = 1
eq result, B
test 'jashkenas/coffee-script#1966: external constructors should produce their return value', ->
ctor = -> {}
class A then constructor: ctor
ok (new A) not instanceof A
test.skip "jashkenas/coffee-script#1534: class then 'use strict'", ->
# [14.1 Directive Prologues and the Use Strict Directive](http://es5.github.com/#x14.1)
nonce = {}
error = 'do -> ok this'
strictTest = "do ->'use strict';#{error}"
return unless (try CoffeeScript.run strictTest, bare: yes catch e then nonce) is nonce
throws -> CoffeeScript.run "class then 'use strict';#{error}", bare: yes
doesNotThrow -> CoffeeScript.run "class then #{error}", bare: yes
doesNotThrow -> CoffeeScript.run "class then #{error};'use strict'", bare: yes
# comments are ignored in the Directive Prologue
comments = ["""
class
### comment ###
'use strict'
#{error}""",
"""
class
### comment 1 ###
### comment 2 ###
'use strict'
#{error}""",
"""
class
### comment 1 ###
### comment 2 ###
'use strict'
#{error}
### comment 3 ###"""
]
throws (-> CoffeeScript.run comment, bare: yes) for comment in comments
# [ES5 §14.1](http://es5.github.com/#x14.1) allows for other directives
directives = ["""
class
'directive 1'
'use strict'
#{error}""",
"""
class
'use strict'
'directive 2'
#{error}""",
"""
class
### comment 1 ###
'directive 1'
'use strict'
#{error}""",
"""
class
### comment 1 ###
'directive 1'
### comment 2 ###
'use strict'
#{error}"""
]
throws (-> CoffeeScript.run directive, bare: yes) for directive in directives
test 'jashkenas/coffee-script#2052: classes should work in strict mode', ->
do ->
'use strict'
class A
suite 'Class Instantiation', ->
test '"@" referring to the current instance, and not being coerced into a call', ->
class ClassName
amI: ->
this instanceof ClassName
obj = new ClassName
ok obj.amI()
test 'a bound function in a bound function', ->
class Mini
num: 10
generate: =>
for i in [0, 0, 0]
=> @num
m = new Mini
eq (func() for func in m.generate()).join(' '), '10 10 10'
test 'contructor called with varargs', ->
class Connection
constructor: (one, two, three) ->
[@one, @two, @three] = [one, two, three]
out: ->
"#{@one}-#{@two}-#{@three}"
list = [3, 2, 1]
conn = new Connection list...
ok conn instanceof Connection
ok conn.out() is '3-2-1'
test 'classes wrapped in decorators', ->
func = (klass) ->
klass::prop = 'value'
klass
func class Test
prop2: 'value2'
ok (new Test).prop is 'value'
ok (new Test).prop2 is 'value2'
test 'ensure that constructors invoked with splats return a new object', ->
args = [1, 2, 3]
Type = (@args) ->
type = new Type args
ok type and type instanceof Type
ok type.args and type.args instanceof Array
ok v is args[i] for v, i in type.args
Type1 = (@a, @b, @c) ->
type1 = new Type1 args...
ok type1 instanceof Type1
eq type1.constructor, Type1
ok type1.a is args[0] and type1.b is args[1] and type1.c is args[2]
# Ensure that constructors invoked with splats cache the function.
called = 0
get = -> if called++ then false else class Type
new get() args...
test '`new` shouldn\'t add extra parens', ->
ok new Date().constructor is Date
# TODO: this test belongs with the operator tests
test '`new` works against bare function', ->
eq Date, new ->
eq this, new => this
Date
suite 'Inheritance and Super', ->
test.skip 'classes with a four-level inheritance chain', -> # Currently syntax error.
#
# class Base
# func: (string) ->
# "zero/#{string}"
#
# @static: (string) ->
# "static/#{string}"
#
# class FirstChild extends Base
# func: (string) ->
# super('one/') + string
#
# SecondChild = class extends FirstChild
# func: (string) ->
# super('two/') + string
#
# thirdCtor = ->
# @array = [1, 2, 3]
#
# class ThirdChild extends SecondChild
# constructor: -> thirdCtor.call this
#
# # Gratuitous comment for testing.
# func: (string) ->
# super('three/') + string
#
# result = (new ThirdChild).func 'four'
#
# ok result is 'zero/one/two/three/four'
# ok Base.static('word') is 'static/word'
#
# FirstChild::func = (string) ->
# super('one/').length + string
#
# result = (new ThirdChild).func 'four'
#
# ok result is '9two/three/four'
#
# ok (new ThirdChild).array.join(' ') is '1 2 3'
test.skip 'constructors with inheritance and super', -> # Currently syntax error.
#
# identity = (f) -> f
#
# class TopClass
# constructor: (arg) ->
# @prop = 'top-' + arg
#
# class SuperClass extends TopClass
# constructor: (arg) ->
# identity super 'super-' + arg
#
# class SubClass extends SuperClass
# constructor: ->
# identity super 'sub'
#
# ok (new SubClass).prop is 'top-super-sub'
test.skip "super with plain ol' functions as the original constructors", -> # Currently syntax error.
#
# TopClass = (arg) ->
# @prop = 'top-' + arg
# this
#
# SuperClass = (arg) ->
# super 'super-' + arg
# this
#
# SubClass = ->
# super 'sub'
# this
#
# SuperClass extends TopClass
# SubClass extends SuperClass
#
# ok (new SubClass).prop is 'top-super-sub'
test.skip 'super() calls in constructors of classes that are defined as object properties', -> # Currently syntax error.
#
# class Hive
# constructor: (name) -> @name = name
#
# class Hive.Bee extends Hive
# constructor: (name) -> super
#
# maya = new Hive.Bee 'Maya'
# ok maya.name is 'Maya'
test.skip 'calling super and passing along all arguments', -> # Currently syntax error.
#
# class Parent
# method: (args...) -> @args = args
#
# class Child extends Parent
# method: -> super
#
# c = new Child
# c.method 1, 2, 3, 4
# ok c.args.join(' ') is '1 2 3 4'
test.skip '`class extends this`', -> # Currently syntax error.
#
# class A
# func: -> 'A'
#
# B = null
# makeClass = ->
# B = class extends this
# func: -> super + ' B'
#
# makeClass.call A
#
# eq (new B()).func(), 'A B'
test 'jashkenas/coffee-script#1313: misplaced __extends', ->
nonce = {}
class A
class B extends A
prop: nonce
constructor: ->
eq nonce, B::prop
test.skip 'jashkenas/coffee-script#1380: `super` with reserved names', -> # Currently syntax error.
# class C
# do: -> super
# ok C::do
#
# class B
# 0: -> super
# ok B::[0]
test 'jashkenas/coffee-script#1482: classes can extend expressions', ->
id = (x) -> x
nonce = {}
class A then nonce: nonce
class B extends id A
eq nonce, (new B).nonce
test.skip 'jashkenas/coffee-script#1598: super works for static methods too', -> # Currently syntax error.
#
# class Parent
# method: ->
# 'NO'
# @method: ->
# 'yes'
#
# class Child extends Parent
# @method: ->
# 'pass? ' + super
#
# eq Child.method(), 'pass? yes'
test 'jashkenas/coffee-script#1876: Class @A extends A', ->
class A
class @A extends A
ok (new @A) instanceof A
test 'jashkenas/coffee-script#1980: regression with an inherited class with static function members', ->
class A
class B extends A
@static = => 'value'
eq B.static(), 'value'
test 'bound function literals as constructors should be treated as unbound', ->
nonce = {}
class A
constructor: =>
@nonce = nonce
a = new A
ok a instanceof A
eq nonce, a.nonce
test '#199: implicit object as static class member', ->
nonceA = {}
nonceB = {}
class A
@prop:
a: nonceA
b: nonceB
eq nonceA, A.prop.a
eq nonceB, A.prop.b
test '#205: implicit objects should not consume following prototype assignments', ->
class A
a: b: 0
c: 1
ok 'a' of A.prototype
ok 'b' of A::a
ok 'b' not of A.prototype
ok 'c' of A.prototype
test '#201: subclasses without explicit constructors inherit parent constructors', ->
i = 0
class A
constructor: -> i++
class B extends A
eq 0, i
a = new A
ok a instanceof A
eq 1, i
b = new B
eq 2, i
ok b instanceof B
ok b instanceof A