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local Optional = require "mason-core.optional"
local _ = require "mason-core.functional"
local spy = require "luassert.spy"
describe("functional: list", function()
it("should produce list without nils", function()
assert.same({ 1, 2, 3, 4 }, _.list_not_nil(nil, 1, 2, nil, 3, nil, 4, nil))
end)
it("makes a shallow copy of a list", function()
local list = { "BLUE", { nested = "TABLE" }, "RED" }
local list_copy = _.list_copy(list)
assert.same({ "BLUE", { nested = "TABLE" }, "RED" }, list_copy)
assert.is_false(list == list_copy)
assert.is_true(list[2] == list_copy[2])
end)
it("reverses lists", function()
local colors = { "BLUE", "YELLOW", "RED" }
assert.same({
"RED",
"YELLOW",
"BLUE",
}, _.reverse(colors))
-- should not modify in-place
assert.same({ "BLUE", "YELLOW", "RED" }, colors)
end)
it("maps over list", function()
local colors = { "BLUE", "YELLOW", "RED" }
assert.same(
{
"LIGHT_BLUE",
"LIGHT_YELLOW",
"LIGHT_RED",
},
_.map(function(color)
return "LIGHT_" .. color
end, colors)
)
-- should not modify in-place
assert.same({ "BLUE", "YELLOW", "RED" }, colors)
end)
it("filter_map over list", function()
local colors = { "BROWN", "BLUE", "YELLOW", "GREEN", "CYAN" }
assert.same(
{
"BROWN EYES",
"BLUE EYES",
"GREEN EYES",
},
_.filter_map(function(color)
if _.any_pass({ _.equals "BROWN", _.equals "BLUE", _.equals "GREEN" }, color) then
return Optional.of(("%s EYES"):format(color))
else
return Optional.empty()
end
end, colors)
)
end)
it("finds first item that fulfills predicate", function()
local predicate = spy.new(function(item)
return item == "Waldo"
end)
assert.equals(
"Waldo",
_.find_first(predicate, {
"Where",
"On Earth",
"Is",
"Waldo",
"?",
})
)
assert.spy(predicate).was.called(4)
end)
it("determines whether any item in the list fulfills predicate", function()
local predicate = spy.new(function(item)
return item == "On Earth"
end)
assert.is_true(_.any(predicate, {
"Where",
"On Earth",
"Is",
"Waldo",
"?",
}))
assert.spy(predicate).was.called(2)
end)
it("should check that all items in list fulfills predicate", function()
assert.is_true(_.all(_.is "string", {
"Where",
"On Earth",
"Is",
"Waldo",
"?",
}))
local predicate = spy.new(_.is "string")
assert.is_false(_.all(predicate, {
"Five",
"Plus",
42,
"Equals",
47,
}))
assert.spy(predicate).was_called(3)
end)
it("should iterate list in .each", function()
local list = { "BLUE", "YELLOW", "RED" }
local iterate_fn = spy.new()
_.each(iterate_fn, list)
assert.spy(iterate_fn).was_called(3)
assert.spy(iterate_fn).was_called_with("BLUE", 1)
assert.spy(iterate_fn).was_called_with("YELLOW", 2)
assert.spy(iterate_fn).was_called_with("RED", 3)
end)
it("should concat list tables", function()
local list = { "monstera", "tulipa", "carnation" }
assert.same({ "monstera", "tulipa", "carnation", "rose", "daisy" }, _.concat(list, { "rose", "daisy" }))
assert.same({ "monstera", "tulipa", "carnation" }, list) -- does not mutate list
end)
it("should concat strings", function()
assert.equals("FooBar", _.concat("Foo", "Bar"))
end)
it("should zip list into table", function()
local fnkey = function() end
assert.same({
a = "a",
[fnkey] = 1,
}, _.zip_table({ "a", fnkey }, { "a", 1 }))
end)
it("should get nth item", function()
assert.equals("first", _.nth(1, { "first", "middle", "last" }))
assert.equals("last", _.nth(-1, { "first", "middle", "last" }))
assert.equals("middle", _.nth(-2, { "first", "middle", "last" }))
assert.equals("a", _.nth(1, "abc"))
assert.equals("c", _.nth(-1, "abc"))
assert.equals("b", _.nth(-2, "abc"))
assert.is_nil(_.nth(0, { "value" }))
assert.equals("", _.nth(0, "abc"))
end)
it("should get length", function()
assert.equals(0, _.length {})
assert.equals(0, _.length { nil })
assert.equals(0, _.length { obj = "doesnt count" })
assert.equals(0, _.length "")
assert.equals(1, _.length { "" })
assert.equals(4, _.length "fire")
end)
it("should sort by comparator", function()
local list = {
{
name = "William",
},
{
name = "Boman",
},
}
assert.same({
{
name = "Boman",
},
{
name = "William",
},
}, _.sort_by(_.prop "name", list))
-- Should not mutate original list
assert.same({
{
name = "William",
},
{
name = "Boman",
},
}, list)
end)
it("should append to list", function()
local list = { "Earth", "Wind" }
assert.same({ "Earth", "Wind", { "Fire" } }, _.append({ "Fire" }, list))
-- Does not mutate original list
assert.same({ "Earth", "Wind" }, list)
end)
it("should prepend to list", function()
local list = { "Fire" }
assert.same({ { "Earth", "Wind" }, "Fire" }, _.prepend({ "Earth", "Wind" }, list))
-- Does not mutate original list
assert.same({ "Fire" }, list)
end)
it("joins lists", function()
assert.equals("Hello, John", _.join(", ", { "Hello", "John" }))
end)
it("should uniq_by lists", function()
local list = { "Person.", "Woman.", "Man.", "Person.", "Woman.", "Camera.", "TV." }
assert.same({ "Person.", "Woman.", "Man.", "Camera.", "TV." }, _.uniq_by(_.identity, list))
end)
it("should partition lists", function()
local words = { "person", "Woman", "Man", "camera", "TV" }
assert.same({
{ "Woman", "Man", "TV" },
{ "person", "camera" },
}, _.partition(_.matches "%u", words))
end)
it("should return head", function()
assert.equals("Head", _.head { "Head", "Tail", "Tail" })
end)
it("should return last", function()
assert.equals("Last", _.last { "Head", "List", "Last" })
end)
it("should take n items", function()
local list = { "First", "Second", "Third", "I", "Have", "Poor", "Imagination" }
assert.same({ "First", "Second", "Third" }, _.take(3, list))
assert.same({}, _.take(0, list))
assert.same({ "First", "Second", "Third", "I", "Have", "Poor", "Imagination" }, _.take(10000, list))
end)
it("should drop n items", function()
local list = { "First", "Second", "Third", "I", "Have", "Poor", "Imagination" }
assert.same({ "I", "Have", "Poor", "Imagination" }, _.drop(3, list))
assert.same({ "First", "Second", "Third", "I", "Have", "Poor", "Imagination" }, _.drop(0, list))
assert.same({}, _.drop(10000, list))
end)
it("should drop last n items", function()
local list = { "First", "Second", "Third", "I", "Have", "Poor", "Imagination" }
assert.same({ "First", "Second", "Third" }, _.drop_last(4, list))
assert.same({ "First", "Second", "Third", "I", "Have", "Poor", "Imagination" }, _.drop_last(0, list))
assert.same({}, _.drop_last(10000, list))
end)
it("should reduce lists", function()
local add = spy.new(_.add)
assert.equals(15, _.reduce(add, 0, { 1, 2, 3, 4, 5 }))
assert.spy(add).was_called(5)
assert.spy(add).was_called_with(0, 1)
assert.spy(add).was_called_with(1, 2)
assert.spy(add).was_called_with(3, 3)
assert.spy(add).was_called_with(6, 4)
assert.spy(add).was_called_with(10, 5)
end)
it("should split lists", function()
assert.same({
{ 1, 2, 3 },
{ 4, 5, 6 },
{ 7 },
}, _.split_every(3, { 1, 2, 3, 4, 5, 6, 7 }))
assert.same({ { 1, 2, 3 } }, _.split_every(5, { 1, 2, 3 }))
assert.same({ { 1 }, { 2 }, { 3 } }, _.split_every(1, { 1, 2, 3 }))
assert.has_error(function()
_.split_every(0, {})
end)
end)
it("should index_by lists", function()
assert.same(
{
apple = { fruit = "apple", color = "red" },
banana = { fruit = "banana", color = "yellow" },
},
_.index_by(_.prop "fruit", {
{ fruit = "apple", color = "red" },
{ fruit = "banana", color = "yellow" },
})
)
end)
it("should flatten tables", function()
assert.same({ 1, 2, 3 }, _.flatten { 1, 2, 3 })
assert.same({ 1, 2, 3, "a" }, _.flatten { 1, { 2 }, { 3 }, "a" })
assert.same({ 1, 2, 3, 4, 5 }, _.flatten { 1, { { 2, 3 }, { 4 } }, { 5 } })
end)
-- Note: this is not necessarily a requirement, but it is expected to behave this way as of writing.
it("should flatten keyed tables", function()
assert.same(
{
"-xvf",
"file",
},
_.flatten {
{ "-xvf", { "file" } },
cmd = "tar",
env = {
LC_ALL = "latin",
},
}
)
end)
end)
describe("list immutability", function()
it("should not mutate lists", function()
local og_list = setmetatable({ "a", "b", "c" }, {
__newindex = function()
error "Tried to newindex"
end,
})
_.reverse(og_list)
_.list_copy(og_list)
_.filter(_.F, og_list)
_.map(_.to_upper, og_list)
_.filter_map(_.always(Optional.empty()), og_list)
_.each(_.length, og_list)
_.concat(og_list, { "d", "e" })
_.append("d", og_list)
_.prepend("0", og_list)
_.zip_table({ "first", "second", "third" }, og_list)
_.nth(1, og_list)
_.head(og_list)
_.last(og_list)
_.length(og_list)
_.flatten(og_list)
_.sort_by(_.identity, og_list)
_.uniq_by(_.identity, og_list)
_.join(".", og_list)
_.partition(_.equals "a", og_list)
_.take(2, og_list)
_.drop(2, og_list)
_.drop_last(2, og_list)
_.reduce(_.concat, "", og_list)
assert.same({ "a", "b", "c" }, og_list)
end)
end)
|
