mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
654 lines
14 KiB
Ruby
654 lines
14 KiB
Ruby
require_relative '../spec_helper'
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require_relative 'fixtures/classes'
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describe "A lambda literal -> () { }" do
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SpecEvaluate.desc = "for definition"
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it "returns a Proc object when used in a BasicObject method" do
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klass = Class.new(BasicObject) do
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def create_lambda
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-> { }
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end
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end
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klass.new.create_lambda.should be_an_instance_of(Proc)
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end
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it "does not execute the block" do
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-> { fail }.should be_an_instance_of(Proc)
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end
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it "returns a lambda" do
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-> { }.lambda?.should be_true
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end
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it "may include a rescue clause" do
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eval('-> do raise ArgumentError; rescue ArgumentError; 7; end').should be_an_instance_of(Proc)
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end
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it "may include a ensure clause" do
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eval('-> do 1; ensure; 2; end').should be_an_instance_of(Proc)
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end
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it "has its own scope for local variables" do
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l = -> arg {
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var = arg
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# this would override var if it was declared outside the lambda
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l.call(arg-1) if arg > 0
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var
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}
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l.call(1).should == 1
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end
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context "assigns no local variables" do
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evaluate <<-ruby do
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@a = -> { }
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@b = ->() { }
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@c = -> () { }
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@d = -> do end
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ruby
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@a.().should be_nil
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@b.().should be_nil
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@c.().should be_nil
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@d.().should be_nil
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end
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end
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context "assigns variables from parameters" do
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evaluate <<-ruby do
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@a = -> (a) { a }
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ruby
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@a.(1).should == 1
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end
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evaluate <<-ruby do
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@a = -> ((a)) { a }
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ruby
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@a.(1).should == 1
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@a.([1, 2, 3]).should == 1
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end
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evaluate <<-ruby do
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@a = -> ((*a, b)) { [a, b] }
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ruby
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@a.(1).should == [[], 1]
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@a.([1, 2, 3]).should == [[1, 2], 3]
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end
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evaluate <<-ruby do
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@a = -> (a={}) { a }
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ruby
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@a.().should == {}
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@a.(2).should == 2
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end
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evaluate <<-ruby do
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@a = -> (*) { }
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ruby
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@a.().should be_nil
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@a.(1).should be_nil
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@a.(1, 2, 3).should be_nil
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end
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evaluate <<-ruby do
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@a = -> (*a) { a }
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ruby
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@a.().should == []
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@a.(1).should == [1]
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@a.(1, 2, 3).should == [1, 2, 3]
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end
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evaluate <<-ruby do
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@a = -> (a:) { a }
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ruby
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-> { @a.() }.should raise_error(ArgumentError)
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@a.(a: 1).should == 1
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end
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evaluate <<-ruby do
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@a = -> (a: 1) { a }
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ruby
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@a.().should == 1
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@a.(a: 2).should == 2
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end
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evaluate <<-ruby do
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@a = -> (**) { }
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ruby
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@a.().should be_nil
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@a.(a: 1, b: 2).should be_nil
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-> { @a.(1) }.should raise_error(ArgumentError)
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end
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evaluate <<-ruby do
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@a = -> (**k) { k }
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ruby
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@a.().should == {}
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@a.(a: 1, b: 2).should == {a: 1, b: 2}
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end
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evaluate <<-ruby do
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@a = -> (&b) { b }
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ruby
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@a.().should be_nil
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@a.() { }.should be_an_instance_of(Proc)
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end
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evaluate <<-ruby do
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@a = -> (a, b) { [a, b] }
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ruby
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@a.(1, 2).should == [1, 2]
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-> { @a.() }.should raise_error(ArgumentError)
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-> { @a.(1) }.should raise_error(ArgumentError)
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end
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evaluate <<-ruby do
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@a = -> ((a, b, *c, d), (*e, f, g), (*h)) do
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[a, b, c, d, e, f, g, h]
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end
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ruby
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@a.(1, 2, 3).should == [1, nil, [], nil, [], 2, nil, [3]]
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result = @a.([1, 2, 3], [4, 5, 6, 7, 8], [9, 10])
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result.should == [1, 2, [], 3, [4, 5, 6], 7, 8, [9, 10]]
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end
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evaluate <<-ruby do
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@a = -> (a, (b, (c, *d, (e, (*f)), g), (h, (i, j)))) do
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[a, b, c, d, e, f, g, h, i, j]
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end
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ruby
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@a.(1, 2).should == [1, 2, nil, [], nil, [nil], nil, nil, nil, nil]
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result = @a.(1, [2, [3, 4, 5, [6, [7, 8]], 9], [10, [11, 12]]])
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result.should == [1, 2, 3, [4, 5], 6, [7, 8], 9, 10, 11, 12]
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end
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ruby_version_is ''...'3.0' do
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evaluate <<-ruby do
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@a = -> (*, **k) { k }
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ruby
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@a.().should == {}
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@a.(1, 2, 3, a: 4, b: 5).should == {a: 4, b: 5}
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suppress_keyword_warning do
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h = mock("keyword splat")
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h.should_receive(:to_hash).and_return({a: 1})
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@a.(h).should == {a: 1}
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end
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end
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end
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ruby_version_is '3.0' do
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evaluate <<-ruby do
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@a = -> (*, **k) { k }
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ruby
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@a.().should == {}
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@a.(1, 2, 3, a: 4, b: 5).should == {a: 4, b: 5}
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h = mock("keyword splat")
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h.should_not_receive(:to_hash)
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@a.(h).should == {}
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end
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end
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evaluate <<-ruby do
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@a = -> (*, &b) { b }
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ruby
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@a.().should be_nil
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@a.(1, 2, 3, 4).should be_nil
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@a.(&(l = ->{})).should equal(l)
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end
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evaluate <<-ruby do
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@a = -> (a:, b:) { [a, b] }
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ruby
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@a.(a: 1, b: 2).should == [1, 2]
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end
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evaluate <<-ruby do
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@a = -> (a:, b: 1) { [a, b] }
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ruby
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@a.(a: 1).should == [1, 1]
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@a.(a: 1, b: 2).should == [1, 2]
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end
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evaluate <<-ruby do
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@a = -> (a: 1, b:) { [a, b] }
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ruby
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@a.(b: 0).should == [1, 0]
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@a.(b: 2, a: 3).should == [3, 2]
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end
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evaluate <<-ruby do
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@a = -> (a: @a = -> (a: 1) { a }, b:) do
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[a, b]
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end
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ruby
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@a.(a: 2, b: 3).should == [2, 3]
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@a.(b: 1).should == [@a, 1]
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# Note the default value of a: in the original method.
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@a.().should == 1
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end
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evaluate <<-ruby do
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@a = -> (a: 1, b: 2) { [a, b] }
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ruby
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@a.().should == [1, 2]
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@a.(b: 3, a: 4).should == [4, 3]
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end
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evaluate <<-ruby do
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@a = -> (a, b=1, *c, (*d, (e)), f: 2, g:, h:, **k, &l) do
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[a, b, c, d, e, f, g, h, k, l]
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end
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ruby
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result = @a.(9, 8, 7, 6, f: 5, g: 4, h: 3, &(l = ->{}))
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result.should == [9, 8, [7], [], 6, 5, 4, 3, {}, l]
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end
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evaluate <<-ruby do
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@a = -> a, b=1, *c, d, e:, f: 2, g:, **k, &l do
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[a, b, c, d, e, f, g, k, l]
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end
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ruby
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result = @a.(1, 2, e: 3, g: 4, h: 5, i: 6, &(l = ->{}))
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result.should == [1, 1, [], 2, 3, 2, 4, { h: 5, i: 6 }, l]
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end
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describe "with circular optional argument reference" do
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ruby_version_is ''...'2.7' do
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it "warns and uses a nil value when there is an existing local variable with same name" do
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a = 1
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-> {
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@proc = eval "-> (a=a) { a }"
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}.should complain(/circular argument reference/)
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@proc.call.should == nil
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end
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it "warns and uses a nil value when there is an existing method with same name" do
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def a; 1; end
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-> {
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@proc = eval "-> (a=a) { a }"
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}.should complain(/circular argument reference/)
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@proc.call.should == nil
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end
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end
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ruby_version_is '2.7' do
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it "raises a SyntaxError if using an existing local with the same name as the argument" do
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a = 1
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-> {
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@proc = eval "-> (a=a) { a }"
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}.should raise_error(SyntaxError)
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end
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it "raises a SyntaxError if there is an existing method with the same name as the argument" do
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def a; 1; end
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-> {
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@proc = eval "-> (a=a) { a }"
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}.should raise_error(SyntaxError)
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end
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end
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it "calls an existing method with the same name as the argument if explicitly using ()" do
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def a; 1; end
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-> a=a() { a }.call.should == 1
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end
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end
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end
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end
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describe "A lambda expression 'lambda { ... }'" do
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SpecEvaluate.desc = "for definition"
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it "calls the #lambda method" do
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obj = mock("lambda definition")
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obj.should_receive(:lambda).and_return(obj)
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def obj.define
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lambda { }
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end
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obj.define.should equal(obj)
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end
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it "does not execute the block" do
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lambda { fail }.should be_an_instance_of(Proc)
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end
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it "returns a lambda" do
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lambda { }.lambda?.should be_true
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end
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it "requires a block" do
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suppress_warning do
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lambda { lambda }.should raise_error(ArgumentError)
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end
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end
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it "may include a rescue clause" do
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eval('lambda do raise ArgumentError; rescue ArgumentError; 7; end').should be_an_instance_of(Proc)
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end
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context "with an implicit block" do
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before do
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def meth; lambda; end
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end
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ruby_version_is ""..."2.7" do
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it "can be created" do
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implicit_lambda = nil
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-> {
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implicit_lambda = meth { 1 }
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}.should complain(/tried to create Proc object without a block/)
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implicit_lambda.lambda?.should be_true
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implicit_lambda.call.should == 1
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end
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end
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ruby_version_is "2.7" do
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it "raises ArgumentError" do
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implicit_lambda = nil
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suppress_warning do
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-> {
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meth { 1 }
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}.should raise_error(ArgumentError, /tried to create Proc object without a block/)
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end
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end
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end
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end
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context "assigns no local variables" do
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evaluate <<-ruby do
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@a = lambda { }
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@b = lambda { || }
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ruby
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@a.().should be_nil
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@b.().should be_nil
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end
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end
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context "assigns variables from parameters" do
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evaluate <<-ruby do
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@a = lambda { |a| a }
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ruby
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@a.(1).should == 1
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end
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evaluate <<-ruby do
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def m(*a) yield(*a) end
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@a = lambda { |a| a }
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ruby
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lambda { m(&@a) }.should raise_error(ArgumentError)
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lambda { m(1, 2, &@a) }.should raise_error(ArgumentError)
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end
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evaluate <<-ruby do
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@a = lambda { |a, | a }
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ruby
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@a.(1).should == 1
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@a.([1, 2]).should == [1, 2]
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lambda { @a.() }.should raise_error(ArgumentError)
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lambda { @a.(1, 2) }.should raise_error(ArgumentError)
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end
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evaluate <<-ruby do
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def m(a) yield a end
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def m2() yield end
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@a = lambda { |a, | a }
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ruby
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m(1, &@a).should == 1
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m([1, 2], &@a).should == [1, 2]
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lambda { m2(&@a) }.should raise_error(ArgumentError)
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end
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evaluate <<-ruby do
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@a = lambda { |(a)| a }
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ruby
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@a.(1).should == 1
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@a.([1, 2, 3]).should == 1
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end
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evaluate <<-ruby do
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@a = lambda { |(*a, b)| [a, b] }
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ruby
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@a.(1).should == [[], 1]
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@a.([1, 2, 3]).should == [[1, 2], 3]
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end
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evaluate <<-ruby do
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@a = lambda { |a={}| a }
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ruby
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@a.().should == {}
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@a.(2).should == 2
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end
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evaluate <<-ruby do
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@a = lambda { |*| }
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ruby
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@a.().should be_nil
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@a.(1).should be_nil
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@a.(1, 2, 3).should be_nil
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end
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evaluate <<-ruby do
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@a = lambda { |*a| a }
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ruby
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@a.().should == []
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@a.(1).should == [1]
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@a.(1, 2, 3).should == [1, 2, 3]
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end
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evaluate <<-ruby do
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@a = lambda { |a:| a }
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ruby
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lambda { @a.() }.should raise_error(ArgumentError)
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@a.(a: 1).should == 1
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end
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evaluate <<-ruby do
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@a = lambda { |a: 1| a }
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ruby
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@a.().should == 1
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@a.(a: 2).should == 2
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end
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evaluate <<-ruby do
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@a = lambda { |**| }
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ruby
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@a.().should be_nil
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@a.(a: 1, b: 2).should be_nil
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lambda { @a.(1) }.should raise_error(ArgumentError)
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end
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evaluate <<-ruby do
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@a = lambda { |**k| k }
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ruby
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@a.().should == {}
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@a.(a: 1, b: 2).should == {a: 1, b: 2}
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end
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evaluate <<-ruby do
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@a = lambda { |&b| b }
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ruby
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@a.().should be_nil
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@a.() { }.should be_an_instance_of(Proc)
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end
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evaluate <<-ruby do
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@a = lambda { |a, b| [a, b] }
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ruby
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@a.(1, 2).should == [1, 2]
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end
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evaluate <<-ruby do
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@a = lambda do |(a, b, *c, d), (*e, f, g), (*h)|
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[a, b, c, d, e, f, g, h]
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end
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ruby
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@a.(1, 2, 3).should == [1, nil, [], nil, [], 2, nil, [3]]
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result = @a.([1, 2, 3], [4, 5, 6, 7, 8], [9, 10])
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result.should == [1, 2, [], 3, [4, 5, 6], 7, 8, [9, 10]]
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end
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evaluate <<-ruby do
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@a = lambda do |a, (b, (c, *d, (e, (*f)), g), (h, (i, j)))|
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[a, b, c, d, e, f, g, h, i, j]
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end
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ruby
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@a.(1, 2).should == [1, 2, nil, [], nil, [nil], nil, nil, nil, nil]
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result = @a.(1, [2, [3, 4, 5, [6, [7, 8]], 9], [10, [11, 12]]])
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result.should == [1, 2, 3, [4, 5], 6, [7, 8], 9, 10, 11, 12]
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end
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ruby_version_is ''...'3.0' do
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evaluate <<-ruby do
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@a = lambda { |*, **k| k }
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ruby
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@a.().should == {}
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@a.(1, 2, 3, a: 4, b: 5).should == {a: 4, b: 5}
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suppress_keyword_warning do
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h = mock("keyword splat")
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h.should_receive(:to_hash).and_return({a: 1})
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@a.(h).should == {a: 1}
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end
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end
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end
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ruby_version_is '3.0' do
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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_not_receive(:to_hash)
|
|
@a.(h).should == {}
|
|
end
|
|
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
|