mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
601 lines
13 KiB
Ruby
601 lines
13 KiB
Ruby
require_relative '../spec_helper'
|
|
require_relative 'fixtures/classes'
|
|
|
|
describe "A lambda literal -> () { }" do
|
|
SpecEvaluate.desc = "for definition"
|
|
|
|
it "returns a Proc object when used in a BasicObject method" do
|
|
klass = Class.new(BasicObject) do
|
|
def create_lambda
|
|
-> { }
|
|
end
|
|
end
|
|
|
|
klass.new.create_lambda.should be_an_instance_of(Proc)
|
|
end
|
|
|
|
it "does not execute the block" do
|
|
-> { fail }.should be_an_instance_of(Proc)
|
|
end
|
|
|
|
it "returns a lambda" do
|
|
-> { }.lambda?.should be_true
|
|
end
|
|
|
|
ruby_version_is "2.6" do
|
|
it "may include a rescue clause" do
|
|
eval('-> do raise ArgumentError; rescue ArgumentError; 7; end').should be_an_instance_of(Proc)
|
|
end
|
|
|
|
it "may include a ensure clause" do
|
|
eval('-> do 1; ensure; 2; end').should be_an_instance_of(Proc)
|
|
end
|
|
end
|
|
|
|
it "has its own scope for local variables" do
|
|
l = -> arg {
|
|
var = arg
|
|
# this would override var if it was declared outside the lambda
|
|
l.call(arg-1) if arg > 0
|
|
var
|
|
}
|
|
l.call(1).should == 1
|
|
end
|
|
|
|
context "assigns no local variables" do
|
|
evaluate <<-ruby do
|
|
@a = -> { }
|
|
@b = ->() { }
|
|
@c = -> () { }
|
|
@d = -> do end
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@b.().should be_nil
|
|
@c.().should be_nil
|
|
@d.().should be_nil
|
|
end
|
|
end
|
|
|
|
context "assigns variables from parameters" do
|
|
evaluate <<-ruby do
|
|
@a = -> (a) { a }
|
|
ruby
|
|
|
|
@a.(1).should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> ((a)) { a }
|
|
ruby
|
|
|
|
@a.(1).should == 1
|
|
@a.([1, 2, 3]).should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> ((*a, b)) { [a, b] }
|
|
ruby
|
|
|
|
@a.(1).should == [[], 1]
|
|
@a.([1, 2, 3]).should == [[1, 2], 3]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a={}) { a }
|
|
ruby
|
|
|
|
@a.().should == {}
|
|
@a.(2).should == 2
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (*) { }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.(1).should be_nil
|
|
@a.(1, 2, 3).should be_nil
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (*a) { a }
|
|
ruby
|
|
|
|
@a.().should == []
|
|
@a.(1).should == [1]
|
|
@a.(1, 2, 3).should == [1, 2, 3]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a:) { a }
|
|
ruby
|
|
|
|
-> { @a.() }.should raise_error(ArgumentError)
|
|
@a.(a: 1).should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a: 1) { a }
|
|
ruby
|
|
|
|
@a.().should == 1
|
|
@a.(a: 2).should == 2
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (**) { }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.(a: 1, b: 2).should be_nil
|
|
-> { @a.(1) }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (**k) { k }
|
|
ruby
|
|
|
|
@a.().should == {}
|
|
@a.(a: 1, b: 2).should == {a: 1, b: 2}
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (&b) { b }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.() { }.should be_an_instance_of(Proc)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a, b) { [a, b] }
|
|
ruby
|
|
|
|
@a.(1, 2).should == [1, 2]
|
|
-> { @a.() }.should raise_error(ArgumentError)
|
|
-> { @a.(1) }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> ((a, b, *c, d), (*e, f, g), (*h)) do
|
|
[a, b, c, d, e, f, g, h]
|
|
end
|
|
ruby
|
|
|
|
@a.(1, 2, 3).should == [1, nil, [], nil, [], 2, nil, [3]]
|
|
result = @a.([1, 2, 3], [4, 5, 6, 7, 8], [9, 10])
|
|
result.should == [1, 2, [], 3, [4, 5, 6], 7, 8, [9, 10]]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a, (b, (c, *d, (e, (*f)), g), (h, (i, j)))) do
|
|
[a, b, c, d, e, f, g, h, i, j]
|
|
end
|
|
ruby
|
|
|
|
@a.(1, 2).should == [1, 2, nil, [], nil, [nil], nil, nil, nil, nil]
|
|
result = @a.(1, [2, [3, 4, 5, [6, [7, 8]], 9], [10, [11, 12]]])
|
|
result.should == [1, 2, 3, [4, 5], 6, [7, 8], 9, 10, 11, 12]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (*, **k) { k }
|
|
ruby
|
|
|
|
@a.().should == {}
|
|
@a.(1, 2, 3, a: 4, b: 5).should == {a: 4, b: 5}
|
|
|
|
h = mock("keyword splat")
|
|
h.should_receive(:to_hash).and_return({a: 1})
|
|
@a.(h).should == {a: 1}
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (*, &b) { b }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.(1, 2, 3, 4).should be_nil
|
|
@a.(&(l = ->{})).should equal(l)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a:, b:) { [a, b] }
|
|
ruby
|
|
|
|
@a.(a: 1, b: 2).should == [1, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a:, b: 1) { [a, b] }
|
|
ruby
|
|
|
|
@a.(a: 1).should == [1, 1]
|
|
@a.(a: 1, b: 2).should == [1, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a: 1, b:) { [a, b] }
|
|
ruby
|
|
|
|
@a.(b: 0).should == [1, 0]
|
|
@a.(b: 2, a: 3).should == [3, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a: @a = -> (a: 1) { a }, b:) do
|
|
[a, b]
|
|
end
|
|
ruby
|
|
|
|
@a.(a: 2, b: 3).should == [2, 3]
|
|
@a.(b: 1).should == [@a, 1]
|
|
|
|
# Note the default value of a: in the original method.
|
|
@a.().should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a: 1, b: 2) { [a, b] }
|
|
ruby
|
|
|
|
@a.().should == [1, 2]
|
|
@a.(b: 3, a: 4).should == [4, 3]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> (a, b=1, *c, (*d, (e)), f: 2, g:, h:, **k, &l) do
|
|
[a, b, c, d, e, f, g, h, k, l]
|
|
end
|
|
ruby
|
|
|
|
result = @a.(9, 8, 7, 6, f: 5, g: 4, h: 3, &(l = ->{}))
|
|
result.should == [9, 8, [7], [], 6, 5, 4, 3, {}, l]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = -> a, b=1, *c, d, e:, f: 2, g:, **k, &l do
|
|
[a, b, c, d, e, f, g, k, l]
|
|
end
|
|
ruby
|
|
|
|
result = @a.(1, 2, e: 3, g: 4, h: 5, i: 6, &(l = ->{}))
|
|
result.should == [1, 1, [], 2, 3, 2, 4, { h: 5, i: 6 }, l]
|
|
end
|
|
|
|
describe "with circular optional argument reference" do
|
|
it "shadows an existing local with the same name as the argument" do
|
|
a = 1
|
|
-> {
|
|
@proc = eval "-> (a=a) { a }"
|
|
}.should complain(/circular argument reference/)
|
|
@proc.call.should == nil
|
|
end
|
|
|
|
it "shadows an existing method with the same name as the argument" do
|
|
def a; 1; end
|
|
-> {
|
|
@proc = eval "-> (a=a) { a }"
|
|
}.should complain(/circular argument reference/)
|
|
@proc.call.should == nil
|
|
end
|
|
|
|
it "calls an existing method with the same name as the argument if explicitly using ()" do
|
|
def a; 1; end
|
|
-> a=a() { a }.call.should == 1
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
describe "A lambda expression 'lambda { ... }'" do
|
|
SpecEvaluate.desc = "for definition"
|
|
|
|
it "calls the #lambda method" do
|
|
obj = mock("lambda definition")
|
|
obj.should_receive(:lambda).and_return(obj)
|
|
|
|
def obj.define
|
|
lambda { }
|
|
end
|
|
|
|
obj.define.should equal(obj)
|
|
end
|
|
|
|
it "does not execute the block" do
|
|
lambda { fail }.should be_an_instance_of(Proc)
|
|
end
|
|
|
|
it "returns a lambda" do
|
|
lambda { }.lambda?.should be_true
|
|
end
|
|
|
|
it "requires a block" do
|
|
lambda { lambda }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
ruby_version_is "2.5" do
|
|
it "may include a rescue clause" do
|
|
eval('lambda do raise ArgumentError; rescue ArgumentError; 7; end').should be_an_instance_of(Proc)
|
|
end
|
|
end
|
|
|
|
|
|
context "with an implicit block" do
|
|
before do
|
|
def meth; lambda; end
|
|
end
|
|
|
|
ruby_version_is ""..."2.7" do
|
|
it "can be created" do
|
|
implicit_lambda = nil
|
|
-> {
|
|
implicit_lambda = meth { 1 }
|
|
}.should complain(/tried to create Proc object without a block/)
|
|
|
|
implicit_lambda.lambda?.should be_true
|
|
implicit_lambda.call.should == 1
|
|
end
|
|
end
|
|
|
|
ruby_version_is "2.7" do
|
|
it "raises ArgumentError" do
|
|
implicit_lambda = nil
|
|
-> {
|
|
meth { 1 }
|
|
}.should raise_error(ArgumentError, /tried to create Proc object without a block/)
|
|
end
|
|
end
|
|
end
|
|
|
|
context "assigns no local variables" do
|
|
evaluate <<-ruby do
|
|
@a = lambda { }
|
|
@b = lambda { || }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@b.().should be_nil
|
|
end
|
|
end
|
|
|
|
context "assigns variables from parameters" do
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a| a }
|
|
ruby
|
|
|
|
@a.(1).should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
def m(*a) yield(*a) end
|
|
@a = lambda { |a| a }
|
|
ruby
|
|
|
|
lambda { m(&@a) }.should raise_error(ArgumentError)
|
|
lambda { m(1, 2, &@a) }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a, | a }
|
|
ruby
|
|
|
|
@a.(1).should == 1
|
|
@a.([1, 2]).should == [1, 2]
|
|
|
|
lambda { @a.() }.should raise_error(ArgumentError)
|
|
lambda { @a.(1, 2) }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
def m(a) yield a end
|
|
def m2() yield end
|
|
|
|
@a = lambda { |a, | a }
|
|
ruby
|
|
|
|
m(1, &@a).should == 1
|
|
m([1, 2], &@a).should == [1, 2]
|
|
|
|
lambda { m2(&@a) }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |(a)| a }
|
|
ruby
|
|
|
|
@a.(1).should == 1
|
|
@a.([1, 2, 3]).should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |(*a, b)| [a, b] }
|
|
ruby
|
|
|
|
@a.(1).should == [[], 1]
|
|
@a.([1, 2, 3]).should == [[1, 2], 3]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a={}| a }
|
|
ruby
|
|
|
|
@a.().should == {}
|
|
@a.(2).should == 2
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |*| }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.(1).should be_nil
|
|
@a.(1, 2, 3).should be_nil
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |*a| a }
|
|
ruby
|
|
|
|
@a.().should == []
|
|
@a.(1).should == [1]
|
|
@a.(1, 2, 3).should == [1, 2, 3]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a:| a }
|
|
ruby
|
|
|
|
lambda { @a.() }.should raise_error(ArgumentError)
|
|
@a.(a: 1).should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a: 1| a }
|
|
ruby
|
|
|
|
@a.().should == 1
|
|
@a.(a: 2).should == 2
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |**| }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.(a: 1, b: 2).should be_nil
|
|
lambda { @a.(1) }.should raise_error(ArgumentError)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |**k| k }
|
|
ruby
|
|
|
|
@a.().should == {}
|
|
@a.(a: 1, b: 2).should == {a: 1, b: 2}
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |&b| b }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.() { }.should be_an_instance_of(Proc)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a, b| [a, b] }
|
|
ruby
|
|
|
|
@a.(1, 2).should == [1, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda do |(a, b, *c, d), (*e, f, g), (*h)|
|
|
[a, b, c, d, e, f, g, h]
|
|
end
|
|
ruby
|
|
|
|
@a.(1, 2, 3).should == [1, nil, [], nil, [], 2, nil, [3]]
|
|
result = @a.([1, 2, 3], [4, 5, 6, 7, 8], [9, 10])
|
|
result.should == [1, 2, [], 3, [4, 5, 6], 7, 8, [9, 10]]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda do |a, (b, (c, *d, (e, (*f)), g), (h, (i, j)))|
|
|
[a, b, c, d, e, f, g, h, i, j]
|
|
end
|
|
ruby
|
|
|
|
@a.(1, 2).should == [1, 2, nil, [], nil, [nil], nil, nil, nil, nil]
|
|
result = @a.(1, [2, [3, 4, 5, [6, [7, 8]], 9], [10, [11, 12]]])
|
|
result.should == [1, 2, 3, [4, 5], 6, [7, 8], 9, 10, 11, 12]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |*, **k| k }
|
|
ruby
|
|
|
|
@a.().should == {}
|
|
@a.(1, 2, 3, a: 4, b: 5).should == {a: 4, b: 5}
|
|
|
|
h = mock("keyword splat")
|
|
h.should_receive(:to_hash).and_return({a: 1})
|
|
@a.(h).should == {a: 1}
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |*, &b| b }
|
|
ruby
|
|
|
|
@a.().should be_nil
|
|
@a.(1, 2, 3, 4).should be_nil
|
|
@a.(&(l = ->{})).should equal(l)
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a:, b:| [a, b] }
|
|
ruby
|
|
|
|
@a.(a: 1, b: 2).should == [1, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a:, b: 1| [a, b] }
|
|
ruby
|
|
|
|
@a.(a: 1).should == [1, 1]
|
|
@a.(a: 1, b: 2).should == [1, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a: 1, b:| [a, b] }
|
|
ruby
|
|
|
|
@a.(b: 0).should == [1, 0]
|
|
@a.(b: 2, a: 3).should == [3, 2]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda do |a: (@a = -> (a: 1) { a }), b:|
|
|
[a, b]
|
|
end
|
|
ruby
|
|
|
|
@a.(a: 2, b: 3).should == [2, 3]
|
|
@a.(b: 1).should == [@a, 1]
|
|
|
|
# Note the default value of a: in the original method.
|
|
@a.().should == 1
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda { |a: 1, b: 2| [a, b] }
|
|
ruby
|
|
|
|
@a.().should == [1, 2]
|
|
@a.(b: 3, a: 4).should == [4, 3]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda do |a, b=1, *c, (*d, (e)), f: 2, g:, h:, **k, &l|
|
|
[a, b, c, d, e, f, g, h, k, l]
|
|
end
|
|
ruby
|
|
|
|
result = @a.(9, 8, 7, 6, f: 5, g: 4, h: 3, &(l = ->{}))
|
|
result.should == [9, 8, [7], [], 6, 5, 4, 3, {}, l]
|
|
end
|
|
|
|
evaluate <<-ruby do
|
|
@a = lambda do |a, b=1, *c, d, e:, f: 2, g:, **k, &l|
|
|
[a, b, c, d, e, f, g, k, l]
|
|
end
|
|
ruby
|
|
|
|
result = @a.(1, 2, e: 3, g: 4, h: 5, i: 6, &(l = ->{}))
|
|
result.should == [1, 1, [], 2, 3, 2, 4, { h: 5, i: 6 }, l]
|
|
end
|
|
end
|
|
end
|