mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
909 lines
24 KiB
Ruby
909 lines
24 KiB
Ruby
# frozen_string_literal: false
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require 'test/unit'
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class TestEnumerator < Test::Unit::TestCase
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def setup
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@obj = Object.new
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class << @obj
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include Enumerable
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def foo(*a)
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a.each {|x| yield x }
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end
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end
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@sized = @obj.clone
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def @sized.size
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42
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end
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end
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def enum_test obj
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obj.map{|e|
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e
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}.sort
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end
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def test_iterators
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assert_equal [0, 1, 2], enum_test(3.times)
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assert_equal [:x, :y, :z], enum_test([:x, :y, :z].each)
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assert_equal [[:x, 1], [:y, 2]], enum_test({:x=>1, :y=>2}.each)
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end
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## Enumerator as Iterator
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def test_next
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e = 3.times
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3.times{|i|
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assert_equal i, e.next
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}
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assert_raise(StopIteration){e.next}
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end
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def test_loop
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e = 3.times
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i = 0
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loop{
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assert_equal(i, e.next)
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i += 1
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}
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end
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def test_loop_return_value
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assert_equal nil, loop { break }
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assert_equal 42, loop { break 42 }
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e = Enumerator.new { |y| y << 1; y << 2; :stopped }
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assert_equal :stopped, loop { e.next while true }
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end
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def test_nested_iteration
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def (o = Object.new).each
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yield :ok1
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yield [:ok2, :x].each.next
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end
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e = o.to_enum
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assert_equal :ok1, e.next
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assert_equal :ok2, e.next
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assert_raise(StopIteration){e.next}
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end
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def test_initialize
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assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).to_a)
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assert_raise(ArgumentError) {
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Enumerator.new(@obj, :foo, 1, 2, 3)
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}
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assert_equal([1, 2, 3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.take(3))
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assert_raise(ArgumentError) { Enumerator.new }
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enum = @obj.to_enum
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assert_raise(NoMethodError) { enum.each {} }
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enum.freeze
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assert_raise(ArgumentError) {
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capture_io do
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# warning: Enumerator.new without a block is deprecated; use Object#to_enum
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enum.__send__(:initialize, @obj, :foo)
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end
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}
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end
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def test_initialize_copy
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assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).dup.to_a)
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e = @obj.to_enum(:foo, 1, 2, 3)
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assert_nothing_raised { assert_equal(1, e.next) }
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assert_raise(TypeError) { e.dup }
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e = Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.dup
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assert_nothing_raised { assert_equal(1, e.next) }
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assert_raise(TypeError) { e.dup }
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end
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def test_gc
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assert_nothing_raised do
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1.times do
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foo = [1,2,3].to_enum
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GC.start
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foo
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end
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GC.start
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end
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end
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def test_slice
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assert_equal([[1,2,3],[4,5,6],[7,8,9],[10]], (1..10).each_slice(3).to_a)
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end
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def test_each_slice_size
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assert_equal(4, (1..10).each_slice(3).size)
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assert_equal(Float::INFINITY, 1.step.each_slice(3).size)
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end
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def test_cons
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a = [[1,2,3], [2,3,4], [3,4,5], [4,5,6], [5,6,7], [6,7,8], [7,8,9], [8,9,10]]
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assert_equal(a, (1..10).each_cons(3).to_a)
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end
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def test_with_index
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assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).with_index.to_a)
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assert_equal([[1,5],[2,6],[3,7]], @obj.to_enum(:foo, 1, 2, 3).with_index(5).to_a)
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end
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def test_with_index_large_offset
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bug8010 = '[ruby-dev:47131] [Bug #8010]'
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s = 1 << (8*1.size-2)
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assert_equal([[1,s],[2,s+1],[3,s+2]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a, bug8010)
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s <<= 1
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assert_equal([[1,s],[2,s+1],[3,s+2]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a, bug8010)
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end
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def test_with_index_nonnum_offset
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bug8010 = '[ruby-dev:47131] [Bug #8010]'
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s = Object.new
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def s.to_int; 1 end
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assert_equal([[1,1],[2,2],[3,3]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a, bug8010)
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end
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def test_with_index_string_offset
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bug8010 = '[ruby-dev:47131] [Bug #8010]'
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assert_raise(TypeError, bug8010){ @obj.to_enum(:foo, 1, 2, 3).with_index('1').to_a }
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end
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def test_with_index_dangling_memo
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bug9178 = '[ruby-core:58692] [Bug #9178]'
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assert_separately([], <<-"end;")
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bug = "#{bug9178}"
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e = [1].to_enum(:chunk).with_index {|c,i| i == 5}
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assert_kind_of(Enumerator, e)
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assert_equal([false, [1]], e.to_a[0], bug)
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end;
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end
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def test_with_object
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obj = [0, 1]
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ret = (1..10).each.with_object(obj) {|i, memo|
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memo[0] += i
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memo[1] *= i
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}
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assert_same(obj, ret)
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assert_equal([55, 3628800], ret)
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a = [2,5,2,1,5,3,4,2,1,0]
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obj = {}
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ret = a.delete_if.with_object(obj) {|i, seen|
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if seen.key?(i)
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true
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else
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seen[i] = true
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false
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end
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}
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assert_same(obj, ret)
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assert_equal([2, 5, 1, 3, 4, 0], a)
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end
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def test_next_rewind
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e = @obj.to_enum(:foo, 1, 2, 3)
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assert_equal(1, e.next)
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assert_equal(2, e.next)
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e.rewind
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assert_equal(1, e.next)
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assert_equal(2, e.next)
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assert_equal(3, e.next)
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assert_raise(StopIteration) { e.next }
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end
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def test_peek
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a = [1]
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e = a.each
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assert_equal(1, e.peek)
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assert_equal(1, e.peek)
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assert_equal(1, e.next)
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assert_raise(StopIteration) { e.peek }
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assert_raise(StopIteration) { e.peek }
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end
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def test_peek_modify
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o = Object.new
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def o.each
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yield 1,2
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end
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e = o.to_enum
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a = e.peek
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a << 3
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assert_equal([1,2], e.peek)
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end
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def test_peek_values_modify
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o = Object.new
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def o.each
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yield 1,2
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end
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e = o.to_enum
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a = e.peek_values
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a << 3
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assert_equal([1,2], e.peek)
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end
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def test_next_after_stopiteration
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a = [1]
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e = a.each
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assert_equal(1, e.next)
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assert_raise(StopIteration) { e.next }
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assert_raise(StopIteration) { e.next }
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e.rewind
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assert_equal(1, e.next)
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assert_raise(StopIteration) { e.next }
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assert_raise(StopIteration) { e.next }
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end
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def test_stop_result
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a = [1]
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res = a.each {}
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e = a.each
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assert_equal(1, e.next)
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exc = assert_raise(StopIteration) { e.next }
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assert_equal(res, exc.result)
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end
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def test_next_values
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o = Object.new
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def o.each
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yield
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yield 1
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yield 1, 2
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end
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e = o.to_enum
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assert_equal(nil, e.next)
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assert_equal(1, e.next)
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assert_equal([1,2], e.next)
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e = o.to_enum
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assert_equal([], e.next_values)
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assert_equal([1], e.next_values)
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assert_equal([1,2], e.next_values)
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end
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def test_peek_values
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o = Object.new
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def o.each
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yield
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yield 1
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yield 1, 2
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end
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e = o.to_enum
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assert_equal(nil, e.peek)
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assert_equal(nil, e.next)
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assert_equal(1, e.peek)
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assert_equal(1, e.next)
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assert_equal([1,2], e.peek)
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assert_equal([1,2], e.next)
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e = o.to_enum
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assert_equal([], e.peek_values)
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assert_equal([], e.next_values)
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assert_equal([1], e.peek_values)
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assert_equal([1], e.next_values)
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assert_equal([1,2], e.peek_values)
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assert_equal([1,2], e.next_values)
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e = o.to_enum
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assert_equal([], e.peek_values)
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assert_equal(nil, e.next)
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assert_equal([1], e.peek_values)
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assert_equal(1, e.next)
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assert_equal([1,2], e.peek_values)
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assert_equal([1,2], e.next)
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e = o.to_enum
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assert_equal(nil, e.peek)
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assert_equal([], e.next_values)
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assert_equal(1, e.peek)
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assert_equal([1], e.next_values)
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assert_equal([1,2], e.peek)
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assert_equal([1,2], e.next_values)
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end
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def test_each_arg
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o = Object.new
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def o.each(ary)
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ary << 1
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yield
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end
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ary = []
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e = o.to_enum { 1 }
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assert_equal(1, e.size)
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e_arg = e.each(ary)
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assert_equal(nil, e_arg.size)
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e_arg.next
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assert_equal([1], ary)
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end
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def test_feed
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.next
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e.feed 1
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e.next
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e.feed 2
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e.next
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e.feed 3
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assert_raise(StopIteration) { e.next }
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assert_equal([1,2,3], ary)
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end
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def test_feed_mixed
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.next
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e.feed 1
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e.next
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e.next
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e.feed 3
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assert_raise(StopIteration) { e.next }
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assert_equal([1,nil,3], ary)
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end
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def test_feed_twice
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.feed 1
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assert_raise(TypeError) { e.feed 2 }
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end
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def test_feed_before_first_next
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.feed 1
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e.next
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e.next
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assert_equal([1], ary)
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end
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def test_rewind_clear_feed
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.next
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e.feed 1
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e.next
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e.feed 2
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e.rewind
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e.next
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e.next
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assert_equal([1,nil], ary)
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end
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def test_feed_yielder
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x = nil
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e = Enumerator.new {|y| x = y.yield; 10 }
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e.next
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e.feed 100
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exc = assert_raise(StopIteration) { e.next }
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assert_equal(100, x)
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assert_equal(10, exc.result)
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end
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def test_inspect
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e = (0..10).each_cons(2)
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assert_equal("#<Enumerator: 0..10:each_cons(2)>", e.inspect)
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e = (0..10).each_with_object({})
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assert_equal("#<Enumerator: 0..10:each_with_object({})>", e.inspect)
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e = (0..10).each_with_object(a: 1)
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assert_equal("#<Enumerator: 0..10:each_with_object(a: 1)>", e.inspect)
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e = Enumerator.new {|y| y.yield; 10 }
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assert_match(/\A#<Enumerator: .*:each>/, e.inspect)
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a = []
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e = a.each_with_object(a)
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a << e
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assert_equal("#<Enumerator: [#<Enumerator: ...>]:each_with_object([#<Enumerator: ...>])>",
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e.inspect)
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end
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def test_inspect_verbose
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bug6214 = '[ruby-dev:45449]'
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assert_warning("", bug6214) { "".bytes.inspect }
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assert_warning("", bug6214) { [].lazy.inspect }
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end
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def test_inspect_encoding
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c = Class.new{define_method("\u{3042}"){}}
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e = c.new.enum_for("\u{3042}")
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s = assert_nothing_raised(Encoding::CompatibilityError) {break e.inspect}
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assert_equal(Encoding::UTF_8, s.encoding)
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assert_match(/\A#<Enumerator: .*:\u{3042}>\z/, s)
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end
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def test_generator
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# note: Enumerator::Generator is a class just for internal
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g = Enumerator::Generator.new {|y| y << 1 << 2 << 3; :foo }
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g2 = g.dup
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a = []
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assert_equal(:foo, g.each {|x| a << x })
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assert_equal([1, 2, 3], a)
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a = []
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assert_equal(:foo, g2.each {|x| a << x })
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assert_equal([1, 2, 3], a)
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g.freeze
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assert_raise(FrozenError) {
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g.__send__ :initialize, proc { |y| y << 4 << 5 }
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}
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g = Enumerator::Generator.new(proc {|y| y << 4 << 5; :foo })
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a = []
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assert_equal(:foo, g.each {|x| a << x })
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assert_equal([4, 5], a)
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assert_raise(LocalJumpError) {Enumerator::Generator.new}
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assert_raise(TypeError) {Enumerator::Generator.new(1)}
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obj = eval("class C\u{1f5ff}; self; end").new
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assert_raise_with_message(TypeError, /C\u{1f5ff}/) {
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Enumerator::Generator.new(obj)
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}
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end
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def test_generator_args
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g = Enumerator::Generator.new {|y, x| y << 1 << 2 << 3; x }
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a = []
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assert_equal(:bar, g.each(:bar) {|x| a << x })
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assert_equal([1, 2, 3], a)
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end
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def test_yielder
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# note: Enumerator::Yielder is a class just for internal
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a = []
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y = Enumerator::Yielder.new {|x| a << x }
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assert_equal(y, y << 1 << 2 << 3)
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assert_equal([1, 2, 3], a)
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a = []
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y = Enumerator::Yielder.new {|x| a << x }
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assert_equal([1], y.yield(1))
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assert_equal([1, 2], y.yield(2))
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assert_equal([1, 2, 3], y.yield(3))
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assert_equal([1, 2, 3, 4], y.yield(4, 5))
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a = []
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y = Enumerator::Yielder.new {|*x| a.concat(x) }
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assert_equal([1], y.yield(1))
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assert_equal([1, 2, 3], y.yield(2, 3))
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assert_raise(LocalJumpError) { Enumerator::Yielder.new }
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# to_proc (explicit)
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a = []
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y = Enumerator::Yielder.new {|x| a << x }
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b = y.to_proc
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assert_kind_of(Proc, b)
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assert_equal([1], b.call(1))
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assert_equal([1], a)
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# to_proc (implicit)
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e = Enumerator.new { |y|
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assert_kind_of(Enumerator::Yielder, y)
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[1, 2, 3].each(&y)
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}
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assert_equal([1, 2, 3], e.to_a)
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end
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def test_size
|
|
assert_equal nil, Enumerator.new{}.size
|
|
assert_equal 42, Enumerator.new(->{42}){}.size
|
|
obj = Object.new
|
|
def obj.call; 42; end
|
|
assert_equal 42, Enumerator.new(obj){}.size
|
|
assert_equal 42, Enumerator.new(42){}.size
|
|
assert_equal 1 << 70, Enumerator.new(1 << 70){}.size
|
|
assert_equal Float::INFINITY, Enumerator.new(Float::INFINITY){}.size
|
|
assert_equal nil, Enumerator.new(nil){}.size
|
|
assert_raise(TypeError) { Enumerator.new("42"){} }
|
|
|
|
assert_equal nil, @obj.to_enum(:foo, 0, 1).size
|
|
assert_equal 2, @obj.to_enum(:foo, 0, 1){ 2 }.size
|
|
end
|
|
|
|
def test_size_for_enum_created_by_enumerators
|
|
enum = to_enum{ 42 }
|
|
assert_equal 42, enum.with_index.size
|
|
assert_equal 42, enum.with_object(:foo).size
|
|
end
|
|
|
|
def test_size_for_enum_created_from_array
|
|
arr = %w[hello world]
|
|
%i[each each_with_index reverse_each sort_by! sort_by map map!
|
|
keep_if reject! reject select! select filter! filter delete_if].each do |method|
|
|
assert_equal arr.size, arr.send(method).size
|
|
end
|
|
end
|
|
|
|
def test_size_for_enum_created_from_enumerable
|
|
%i[find_all reject map flat_map partition group_by sort_by min_by max_by
|
|
minmax_by each_with_index reverse_each each_entry filter_map].each do |method|
|
|
assert_equal nil, @obj.send(method).size
|
|
assert_equal 42, @sized.send(method).size
|
|
end
|
|
assert_equal nil, @obj.each_with_object(nil).size
|
|
assert_equal 42, @sized.each_with_object(nil).size
|
|
end
|
|
|
|
def test_size_for_enum_created_from_hash
|
|
h = {a: 1, b: 2, c: 3}
|
|
methods = %i[delete_if reject reject! select select! filter filter! keep_if each each_key each_pair]
|
|
enums = methods.map {|method| h.send(method)}
|
|
s = enums.group_by(&:size)
|
|
assert_equal([3], s.keys, ->{s.reject!{|k| k==3}.inspect})
|
|
h[:d] = 4
|
|
s = enums.group_by(&:size)
|
|
assert_equal([4], s.keys, ->{s.reject!{|k| k==4}.inspect})
|
|
end
|
|
|
|
def test_size_for_enum_created_from_env
|
|
%i[each_pair reject! delete_if select select! filter filter! keep_if].each do |method|
|
|
assert_equal ENV.size, ENV.send(method).size
|
|
end
|
|
end
|
|
|
|
def test_size_for_enum_created_from_struct
|
|
s = Struct.new(:foo, :bar, :baz).new(1, 2)
|
|
%i[each each_pair select].each do |method|
|
|
assert_equal 3, s.send(method).size
|
|
end
|
|
end
|
|
|
|
def check_consistency_for_combinatorics(method)
|
|
[ [], [:a, :b, :c, :d, :e] ].product([-2, 0, 2, 5, 6]) do |array, arg|
|
|
assert_equal array.send(method, arg).to_a.size, array.send(method, arg).size,
|
|
"inconsistent size for #{array}.#{method}(#{arg})"
|
|
end
|
|
end
|
|
|
|
def test_size_for_array_combinatorics
|
|
check_consistency_for_combinatorics(:permutation)
|
|
assert_equal 24, [0, 1, 2, 4].permutation.size
|
|
assert_equal 2933197128679486453788761052665610240000000,
|
|
(1..42).to_a.permutation(30).size # 1.upto(42).inject(:*) / 1.upto(12).inject(:*)
|
|
|
|
check_consistency_for_combinatorics(:combination)
|
|
assert_equal 28258808871162574166368460400,
|
|
(1..100).to_a.combination(42).size
|
|
# 1.upto(100).inject(:*) / 1.upto(42).inject(:*) / 1.upto(58).inject(:*)
|
|
|
|
check_consistency_for_combinatorics(:repeated_permutation)
|
|
assert_equal 291733167875766667063796853374976,
|
|
(1..42).to_a.repeated_permutation(20).size # 42 ** 20
|
|
|
|
check_consistency_for_combinatorics(:repeated_combination)
|
|
assert_equal 28258808871162574166368460400,
|
|
(1..59).to_a.repeated_combination(42).size
|
|
# 1.upto(100).inject(:*) / 1.upto(42).inject(:*) / 1.upto(58).inject(:*)
|
|
end
|
|
|
|
def test_size_for_cycle
|
|
assert_equal Float::INFINITY, [:foo].cycle.size
|
|
assert_equal 10, [:foo, :bar].cycle(5).size
|
|
assert_equal 0, [:foo, :bar].cycle(-10).size
|
|
assert_equal Float::INFINITY, {foo: 1}.cycle.size
|
|
assert_equal 10, {foo: 1, bar: 2}.cycle(5).size
|
|
assert_equal 0, {foo: 1, bar: 2}.cycle(-10).size
|
|
assert_equal 0, [].cycle.size
|
|
assert_equal 0, [].cycle(5).size
|
|
assert_equal 0, {}.cycle.size
|
|
assert_equal 0, {}.cycle(5).size
|
|
|
|
assert_equal nil, @obj.cycle.size
|
|
assert_equal nil, @obj.cycle(5).size
|
|
assert_equal Float::INFINITY, @sized.cycle.size
|
|
assert_equal 126, @sized.cycle(3).size
|
|
assert_equal Float::INFINITY, [].to_enum { 42 }.cycle.size
|
|
assert_equal 0, [].to_enum { 0 }.cycle.size
|
|
|
|
assert_raise(TypeError) {[].to_enum { 0 }.cycle("").size}
|
|
end
|
|
|
|
def test_size_for_loops
|
|
assert_equal Float::INFINITY, loop.size
|
|
assert_equal 42, 42.times.size
|
|
end
|
|
|
|
def test_size_for_each_slice
|
|
assert_equal nil, @obj.each_slice(3).size
|
|
assert_equal 6, @sized.each_slice(7).size
|
|
assert_equal 5, @sized.each_slice(10).size
|
|
assert_equal 1, @sized.each_slice(70).size
|
|
assert_raise(ArgumentError){ @obj.each_slice(0).size }
|
|
end
|
|
|
|
def test_size_for_each_cons
|
|
assert_equal nil, @obj.each_cons(3).size
|
|
assert_equal 33, @sized.each_cons(10).size
|
|
assert_equal 0, @sized.each_cons(70).size
|
|
assert_raise(ArgumentError){ @obj.each_cons(0).size }
|
|
end
|
|
|
|
def test_size_for_step
|
|
assert_equal 42, 5.step(46).size
|
|
assert_equal 4, 1.step(10, 3).size
|
|
assert_equal 3, 1.step(9, 3).size
|
|
assert_equal 0, 1.step(-11).size
|
|
assert_equal 0, 1.step(-11, 2).size
|
|
assert_equal 7, 1.step(-11, -2).size
|
|
assert_equal 7, 1.step(-11.1, -2).size
|
|
assert_equal 0, 42.step(Float::INFINITY, -2).size
|
|
assert_equal 1, 42.step(55, Float::INFINITY).size
|
|
assert_equal 1, 42.step(Float::INFINITY, Float::INFINITY).size
|
|
assert_equal 14, 0.1.step(4.2, 0.3).size
|
|
assert_equal Float::INFINITY, 42.step(Float::INFINITY, 2).size
|
|
|
|
assert_equal 10, (1..10).step.size
|
|
assert_equal 4, (1..10).step(3).size
|
|
assert_equal 3, (1...10).step(3).size
|
|
assert_equal Float::INFINITY, (42..Float::INFINITY).step(2).size
|
|
assert_equal 0, (1..10).step(-2).size
|
|
end
|
|
|
|
def test_size_for_downup_to
|
|
assert_equal 0, 1.upto(-100).size
|
|
assert_equal 102, 1.downto(-100).size
|
|
assert_equal Float::INFINITY, 42.upto(Float::INFINITY).size
|
|
end
|
|
|
|
def test_size_for_string
|
|
assert_equal 5, 'hello'.each_byte.size
|
|
assert_equal 5, 'hello'.each_char.size
|
|
assert_equal 5, 'hello'.each_codepoint.size
|
|
end
|
|
|
|
def test_peek_for_enumerator_objects
|
|
e = 2.times
|
|
assert_equal(0, e.peek)
|
|
e.next
|
|
assert_equal(1, e.peek)
|
|
e.next
|
|
assert_raise(StopIteration) { e.peek }
|
|
end
|
|
|
|
def test_uniq
|
|
u = [0, 1, 0, 1].to_enum.lazy.uniq
|
|
assert_equal([0, 1], u.force)
|
|
assert_equal([0, 1], u.force)
|
|
end
|
|
|
|
def test_compact
|
|
u = [0, 1, nil, 2, 3, nil].to_enum.lazy.compact
|
|
assert_equal([0, 1, 2, 3], u.force)
|
|
end
|
|
|
|
def test_enum_chain_and_plus
|
|
r = 1..5
|
|
|
|
e1 = r.chain()
|
|
assert_kind_of(Enumerator::Chain, e1)
|
|
assert_equal(5, e1.size)
|
|
ary = []
|
|
e1.each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5], ary)
|
|
|
|
e2 = r.chain([6, 7, 8])
|
|
assert_kind_of(Enumerator::Chain, e2)
|
|
assert_equal(8, e2.size)
|
|
ary = []
|
|
e2.each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 6, 7, 8], ary)
|
|
|
|
e3 = r.chain([6, 7], 8.step)
|
|
assert_kind_of(Enumerator::Chain, e3)
|
|
assert_equal(Float::INFINITY, e3.size)
|
|
ary = []
|
|
e3.take(10).each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], ary)
|
|
|
|
# `a + b + c` should not return `Enumerator::Chain.new(a, b, c)`
|
|
# because it is expected that `(a + b).each` be called.
|
|
e4 = e2.dup
|
|
class << e4
|
|
attr_reader :each_is_called
|
|
def each
|
|
super
|
|
@each_is_called = true
|
|
end
|
|
end
|
|
e5 = e4 + 9.step
|
|
assert_kind_of(Enumerator::Chain, e5)
|
|
assert_equal(Float::INFINITY, e5.size)
|
|
ary = []
|
|
e5.take(10).each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], ary)
|
|
assert_equal(true, e4.each_is_called)
|
|
end
|
|
|
|
def test_chained_enums
|
|
a = (1..5).each
|
|
|
|
e0 = Enumerator::Chain.new()
|
|
assert_kind_of(Enumerator::Chain, e0)
|
|
assert_equal(0, e0.size)
|
|
ary = []
|
|
e0.each { |x| ary << x }
|
|
assert_equal([], ary)
|
|
|
|
e1 = Enumerator::Chain.new(a)
|
|
assert_kind_of(Enumerator::Chain, e1)
|
|
assert_equal(5, e1.size)
|
|
ary = []
|
|
e1.each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5], ary)
|
|
|
|
e2 = Enumerator::Chain.new(a, [6, 7, 8])
|
|
assert_kind_of(Enumerator::Chain, e2)
|
|
assert_equal(8, e2.size)
|
|
ary = []
|
|
e2.each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 6, 7, 8], ary)
|
|
|
|
e3 = Enumerator::Chain.new(a, [6, 7], 8.step)
|
|
assert_kind_of(Enumerator::Chain, e3)
|
|
assert_equal(Float::INFINITY, e3.size)
|
|
ary = []
|
|
e3.take(10).each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], ary)
|
|
|
|
e4 = Enumerator::Chain.new(a, Enumerator.new { |y| y << 6 << 7 << 8 })
|
|
assert_kind_of(Enumerator::Chain, e4)
|
|
assert_equal(nil, e4.size)
|
|
ary = []
|
|
e4.each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 6, 7, 8], ary)
|
|
|
|
e5 = Enumerator::Chain.new(e1, e2)
|
|
assert_kind_of(Enumerator::Chain, e5)
|
|
assert_equal(13, e5.size)
|
|
ary = []
|
|
e5.each { |x| ary << x }
|
|
assert_equal([1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 6, 7, 8], ary)
|
|
|
|
rewound = []
|
|
e1.define_singleton_method(:rewind) { rewound << object_id }
|
|
e2.define_singleton_method(:rewind) { rewound << object_id }
|
|
e5.rewind
|
|
assert_equal(rewound, [e2.object_id, e1.object_id])
|
|
|
|
rewound = []
|
|
a = [1]
|
|
e6 = Enumerator::Chain.new(a)
|
|
a.define_singleton_method(:rewind) { rewound << object_id }
|
|
e6.rewind
|
|
assert_equal(rewound, [])
|
|
|
|
assert_equal(
|
|
'#<Enumerator::Chain: [' +
|
|
'#<Enumerator::Chain: [' +
|
|
'#<Enumerator: 1..5:each>' +
|
|
']>, ' +
|
|
'#<Enumerator::Chain: [' +
|
|
'#<Enumerator: 1..5:each>, ' +
|
|
'[6, 7, 8]' +
|
|
']>' +
|
|
']>',
|
|
e5.inspect
|
|
)
|
|
end
|
|
|
|
def test_chain_with_index
|
|
assert_equal([[3, 0], [4, 1]], [3].chain([4]).with_index.to_a)
|
|
end
|
|
|
|
def test_lazy_chain
|
|
ea = (10..).lazy.select(&:even?).take(10)
|
|
ed = (20..).lazy.select(&:odd?)
|
|
chain = (ea + ed).select{|x| x % 3 == 0}
|
|
assert_equal(12, chain.next)
|
|
assert_equal(18, chain.next)
|
|
assert_equal(24, chain.next)
|
|
assert_equal(21, chain.next)
|
|
assert_equal(27, chain.next)
|
|
assert_equal(33, chain.next)
|
|
end
|
|
|
|
def test_chain_undef_methods
|
|
chain = [1].to_enum + [2].to_enum
|
|
meths = (chain.methods & [:feed, :next, :next_values, :peek, :peek_values])
|
|
assert_equal(0, meths.size)
|
|
end
|
|
|
|
def test_produce
|
|
assert_raise(ArgumentError) { Enumerator.produce }
|
|
|
|
# Without initial object
|
|
passed_args = []
|
|
enum = Enumerator.produce { |obj| passed_args << obj; (obj || 0).succ }
|
|
assert_instance_of(Enumerator, enum)
|
|
assert_equal Float::INFINITY, enum.size
|
|
assert_equal [1, 2, 3], enum.take(3)
|
|
assert_equal [nil, 1, 2], passed_args
|
|
|
|
# With initial object
|
|
passed_args = []
|
|
enum = Enumerator.produce(1) { |obj| passed_args << obj; obj.succ }
|
|
assert_instance_of(Enumerator, enum)
|
|
assert_equal Float::INFINITY, enum.size
|
|
assert_equal [1, 2, 3], enum.take(3)
|
|
assert_equal [1, 2], passed_args
|
|
|
|
# With initial keyword arguments
|
|
passed_args = []
|
|
enum = Enumerator.produce(a: 1, b: 1) { |obj| passed_args << obj; obj.shift if obj.respond_to?(:shift)}
|
|
assert_instance_of(Enumerator, enum)
|
|
assert_equal Float::INFINITY, enum.size
|
|
assert_equal [{b: 1}, [1], :a, nil], enum.take(4)
|
|
assert_equal [{b: 1}, [1], :a], passed_args
|
|
|
|
# Raising StopIteration
|
|
words = "The quick brown fox jumps over the lazy dog.".scan(/\w+/)
|
|
enum = Enumerator.produce { words.shift or raise StopIteration }
|
|
assert_equal Float::INFINITY, enum.size
|
|
assert_instance_of(Enumerator, enum)
|
|
assert_equal %w[The quick brown fox jumps over the lazy dog], enum.to_a
|
|
|
|
# Raising StopIteration
|
|
object = [[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"], "stuv", "wxyz"]
|
|
enum = Enumerator.produce(object) { |obj|
|
|
obj.respond_to?(:first) or raise StopIteration
|
|
obj.first
|
|
}
|
|
assert_equal Float::INFINITY, enum.size
|
|
assert_instance_of(Enumerator, enum)
|
|
assert_nothing_raised {
|
|
assert_equal [
|
|
[[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"], "stuv", "wxyz"],
|
|
[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"],
|
|
[["abc", "def"], "ghi", "jkl"],
|
|
["abc", "def"],
|
|
"abc",
|
|
], enum.to_a
|
|
}
|
|
end
|
|
|
|
def test_chain_each_lambda
|
|
c = Class.new do
|
|
include Enumerable
|
|
attr_reader :is_lambda
|
|
def each(&block)
|
|
return to_enum unless block
|
|
@is_lambda = block.lambda?
|
|
end
|
|
end
|
|
e = c.new
|
|
e.chain.each{}
|
|
assert_equal(false, e.is_lambda)
|
|
e.chain.each(&->{})
|
|
assert_equal(true, e.is_lambda)
|
|
end
|
|
end
|