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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerator::Lazy#grep" do
before :each do
@yieldsmixed = EnumeratorLazySpecs::YieldsMixed.new.to_enum.lazy
@eventsmixed = EnumeratorLazySpecs::EventsMixed.new.to_enum.lazy
ScratchPad.record []
end
after :each do
ScratchPad.clear
end
it "requires an argument" do
Enumerator::Lazy.instance_method(:grep).arity.should == 1
end
it "returns a new instance of Enumerator::Lazy" do
ret = @yieldsmixed.grep(Object) {}
ret.should be_an_instance_of(Enumerator::Lazy)
ret.should_not equal(@yieldsmixed)
ret = @yieldsmixed.grep(Object)
ret.should be_an_instance_of(Enumerator::Lazy)
ret.should_not equal(@yieldsmixed)
end
it "sets #size to nil" do
Enumerator::Lazy.new(Object.new, 100) {}.grep(Object) {}.size.should == nil
Enumerator::Lazy.new(Object.new, 100) {}.grep(Object).size.should == nil
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times when not given a block" do
(0..Float::INFINITY).lazy.grep(Integer).first(3).should == [0, 1, 2]
@eventsmixed.grep(BasicObject).first(1)
ScratchPad.recorded.should == [:before_yield]
end
it "stops after specified times when given a block" do
(0..Float::INFINITY).lazy.grep(Integer, &:succ).first(3).should == [1, 2, 3]
@eventsmixed.grep(BasicObject) {}.first(1)
ScratchPad.recorded.should == [:before_yield]
end
end
it "calls the block with a gathered array when yield with multiple arguments" do
yields = []
@yieldsmixed.grep(BasicObject) { |v| yields << v }.force
yields.should == EnumeratorLazySpecs::YieldsMixed.gathered_yields
@yieldsmixed.grep(BasicObject).force.should == yields
end
describe "on a nested Lazy" do
it "sets #size to nil" do
Enumerator::Lazy.new(Object.new, 100) {}.grep(Object) {}.size.should == nil
Enumerator::Lazy.new(Object.new, 100) {}.grep(Object).size.should == nil
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times when not given a block" do
(0..Float::INFINITY).lazy.grep(Integer).grep(Object).first(3).should == [0, 1, 2]
@eventsmixed.grep(BasicObject).grep(Object).first(1)
ScratchPad.recorded.should == [:before_yield]
end
it "stops after specified times when given a block" do
(0..Float::INFINITY).lazy.grep(Integer) { |n| n > 3 ? n : false }.grep(Integer) { |n| n.even? ? n : false }.first(3).should == [4, false, 6]
@eventsmixed.grep(BasicObject) {}.grep(Object) {}.first(1)
ScratchPad.recorded.should == [:before_yield]
end
end
end
end
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