/**
/**
* Copyright (c) 2013 Quildreen Motta
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
spec = (require 'hifive')!
Either = require '../../src/'
{for-all, data: {Any:BigAny, Int}, sized} = require 'claire'
{ok, throws} = require 'assert'
{Left, Right} = Either
Any = sized (-> 10), BigAny
k = (a, b) --> a
module.exports = spec 'Either' (o, spec) ->
spec 'Constructors' (o) ->
o 'Left' do
for-all(Any).satisfy (a) ->
Left(a).is-left and not Left(a).is-right
.as-test!
o 'Right' do
for-all(Any).satisfy (a) ->
Right(a).is-right and not Right(a).is-left
.as-test!
o 'from-nullable' do
for-all(Any).satisfy (a) ->
| a? => Either.from-nullable(a).is-right
| _ => Either.from-nullable(a).is-left
.classify (a) ->
| a? => 'Not null'
| _ => 'Null'
.as-test!
o 'of should always return a Right' do
for-all(Any).satisfy (a) ->
Either.of(a).is-equal Right(a)
.as-test!
o 'ap(b) should keep b for Lefts' do
for-all(Int).satisfy (a) ->
Left((a) -> a + 1).ap(Right(a)).is-equal Right(a)
.as-test!
o 'map(f) should keep Lefts unchanged' do
for-all(Any).satisfy (a) ->
Left(a).map((_) -> [a,a]).is-equal Left(a)
.as-test!
o 'chain(f) should keep Lefts unchanged' do
for-all(Any).satisfy (a) ->
Left(a).chain((_) -> Right(a)).is-equal Left(a)
.as-test!
spec 'to-string()' (o) ->
o 'Right' do
for-all(Int).satisfy (a) ->
Right(a).to-string! is "Either.Right(#a)"
.as-test!
o 'Left' do
for-all(Int).satisfy (a) ->
Left(a).to-string! is "Either.Left(#a)"
.as-test!
spec 'is-equal(b)' (o) ->
o 'Rights are always equivalent to Rights, but not Lefts' do
for-all(Any).satisfy (a) ->
Right(a).is-equal(Right(a)) and not Right(a).is-equal(Left(a))
.as-test!
o 'Rights are never equal Rights with different values' do
for-all(Any, Any).given (!==) .satisfy (a, b) ->
not Right(a).is-equal(Right(b))
.as-test!
spec 'get()' (o) ->
o 'For rights should return the value.' do
for-all(Any).satisfy (a) ->
Right(a).get! is a
.as-test!
o 'For lefts should throw a type error' do
for-all(Any).satisfy (a) ->
throws (-> Left(a).get!), TypeError
true
.as-test!
spec 'get-or-else(a)' (o) ->
o 'For rights should return the value.' do
for-all(Any, Any).satisfy (a, b) ->
Right(a).get-or-else(b) is a
.as-test!
o 'For lefts should return the alternative.' do
for-all(Any, Any).satisfy (a, b) ->
Left(a).get-or-else(b) is b
.as-test!
spec 'or-else(f)' (o) ->
o 'For rights should return itself' do
for-all(Any, Any).satisfy (a, b) ->
Right(a).or-else((-> Left(b))).is-equal Right(a)
.as-test!
o 'For lefts should return the Either f returns' do
for-all(Any, Any).given (!==) .satisfy (a, b) ->
Left(a).or-else((-> Right(b))).is-equal Right(b)
.as-test!
o 'merge() should return any value' do
for-all(Any).satisfy (a) ->
Right(a).merge! is Left(a).merge!
.as-test!
spec 'fold(f, g)' (o) ->
o 'For lefts, should call f' do
for-all(Any, Any, Any).given (!==) .satisfy (a, b, c) ->
Left(a).fold(k Right(b); k Left(c)).is-equal Right(b)
.as-test!
o 'For rights, should call g' do
for-all(Any, Any, Any).given (!==) .satisfy (a, b, c) ->
Right(a).fold(k Right(b); k Left(c)).is-equal Left(c)
.as-test!
o 'swap()' do
for-all(Any).satisfy (a) ->
Right(a).swap!is-equal(Left(a)) and Left(a).swap!is-equal(Right(a))
.as-test!
spec 'bimap(f, g)' (o) ->
o 'For lefts should return a new left mapped by f' do
for-all(Any, Any, Any)
.given ((a, b, c) -> a !== b and b !== c)
.satisfy (a, b, c) ->
Left(a).bimap(k b; k c).is-equal Left(b)
.as-test!
o 'For rights should return a new right mapped by f' do
for-all(Any, Any, Any)
.given ((a, b, c) -> a !== c and b !== c)
.satisfy (a, b, c) ->
Right(a).bimap(k b; k c).is-equal Right(c)
.as-test!
spec 'left-map(f)' (o) ->
o 'For lefts should return a new left mapped by f' do
for-all(Any, Any).given (!==) .satisfy (a, b) ->
Left(a).left-map(k b).is-equal Left(b)
.as-test!
o 'For rights should return itself' do
for-all(Any, Any).given (!==) .satisfy (a, b) ->
Right(a).left-map(k b).is-equal Right(a)
.as-test!
Specification for Either