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require_relative '../../spec_helper'
describe "Proc#parameters" do
it "returns an empty Array for a proc expecting no parameters" do
proc {}.parameters.should == []
end
it "returns an Array of Arrays for a proc expecting parameters" do
p = proc {|x| }
p.parameters.should be_an_instance_of(Array)
p.parameters.first.should be_an_instance_of(Array)
end
it "sets the first element of each sub-Array to :opt for optional arguments" do
proc {|x| }.parameters.first.first.should == :opt
proc {|y,*x| }.parameters.first.first.should == :opt
end
it "regards named parameters in procs as optional" do
proc {|x| }.parameters.first.first.should == :opt
end
ruby_version_is "3.2" do
it "sets the first element of each sub-Array to :req for required argument if lambda keyword used" do
proc {|x| }.parameters(lambda: true).first.first.should == :req
proc {|y,*x| }.parameters(lambda: true).first.first.should == :req
end
it "regards named parameters in procs as required if lambda keyword used" do
proc {|x| }.parameters(lambda: true).first.first.should == :req
end
it "regards named parameters in lambda as optional if lambda: false keyword used" do
-> x { }.parameters(lambda: false).first.first.should == :opt
end
end
it "regards optional keyword parameters in procs as optional" do
proc {|x: :y| }.parameters.first.first.should == :key
end
it "regards parameters with default values as optional" do
-> x=1 { }.parameters.first.first.should == :opt
proc {|x=1| }.parameters.first.first.should == :opt
end
it "sets the first element of each sub-Array to :req for required arguments" do
-> x, y=[] { }.parameters.first.first.should == :req
-> y, *x { }.parameters.first.first.should == :req
end
it "regards named parameters in lambdas as required" do
-> x { }.parameters.first.first.should == :req
end
it "regards keyword parameters in lambdas as required" do
eval("lambda {|x:| }").parameters.first.first.should == :keyreq
end
it "sets the first element of each sub-Array to :rest for parameters prefixed with asterisks" do
-> *x { }.parameters.first.first.should == :rest
-> x, *y { }.parameters.last.first.should == :rest
proc {|*x| }.parameters.first.first.should == :rest
proc {|x,*y| }.parameters.last.first.should == :rest
end
it "sets the first element of each sub-Array to :keyrest for parameters prefixed with double asterisks" do
-> **x { }.parameters.first.first.should == :keyrest
-> x, **y { }.parameters.last.first.should == :keyrest
proc {|**x| }.parameters.first.first.should == :keyrest
proc {|x,**y| }.parameters.last.first.should == :keyrest
end
it "sets the first element of each sub-Array to :block for parameters prefixed with ampersands" do
-> &x { }.parameters.first.first.should == :block
-> x, &y { }.parameters.last.first.should == :block
proc {|&x| }.parameters.first.first.should == :block
proc {|x,&y| }.parameters.last.first.should == :block
end
it "sets the second element of each sub-Array to the name of the argument" do
-> x { }.parameters.first.last.should == :x
-> x=Math::PI { }.parameters.first.last.should == :x
-> an_argument, glark, &foo { }.parameters[1].last.should == :glark
-> *rest { }.parameters.first.last.should == :rest
-> &block { }.parameters.first.last.should == :block
proc {|x| }.parameters.first.last.should == :x
proc {|x=Math::PI| }.parameters.first.last.should == :x
proc {|an_argument, glark, &foo| }.parameters[1].last.should == :glark
proc {|*rest| }.parameters.first.last.should == :rest
proc {|&block| }.parameters.first.last.should == :block
end
it "ignores unnamed rest arguments" do
-> x {}.parameters.should == [[:req, :x]]
end
ruby_version_is '3.2' do
it "adds rest arg with name * for \"star\" argument" do
-> * {}.parameters.should == [[:rest, :*]]
end
it "adds keyrest arg with ** as a name for \"double star\" argument" do
-> ** {}.parameters.should == [[:keyrest, :**]]
end
end
ruby_version_is ''...'3.2' do
it "adds nameless rest arg for \"star\" argument" do
-> * {}.parameters.should == [[:rest]]
end
it "adds nameless keyrest arg for \"double star\" argument" do
-> ** {}.parameters.should == [[:keyrest]]
end
end
ruby_version_is '3.1' do
it "adds block arg with name & for anonymous block argument" do
eval('-> & {}.parameters').should == [[:block, :&]]
end
end
it "does not add locals as block options with a block and splat" do
-> *args, &blk do
local_is_not_parameter = {}
end.parameters.should == [[:rest, :args], [:block, :blk]]
proc do |*args, &blk|
local_is_not_parameter = {}
end.parameters.should == [[:rest, :args], [:block, :blk]]
end
it "returns all parameters defined with the name _ as _" do
proc = proc {|_, _, _ = 1, *_, _:, _: 2, **_, &_| }
proc.parameters.should == [
[:opt, :_],
[:opt, :_],
[:opt, :_],
[:rest, :_],
[:keyreq, :_],
[:key, :_],
[:keyrest, :_],
[:block, :_]
]
lambda = -> _, _, _ = 1, *_, _:, _: 2, **_, &_ {}
lambda.parameters.should == [
[:req, :_],
[:req, :_],
[:opt, :_],
[:rest, :_],
[:keyreq, :_],
[:key, :_],
[:keyrest, :_],
[:block, :_]
]
end
end
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