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f43f9f33ac
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41370 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
475 lines
14 KiB
Ruby
475 lines
14 KiB
Ruby
require 'test/unit'
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require_relative 'envutil'
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class TestLazyEnumerator < Test::Unit::TestCase
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class Step
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include Enumerable
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attr_reader :current, :args
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def initialize(enum)
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@enum = enum
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@current = nil
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@args = nil
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end
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def each(*args)
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@args = args
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@enum.each {|i| @current = i; yield i}
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end
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end
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def test_initialize
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assert_equal([1, 2, 3], [1, 2, 3].lazy.to_a)
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assert_equal([1, 2, 3], Enumerator::Lazy.new([1, 2, 3]){|y, v| y << v}.to_a)
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assert_raise(ArgumentError) { Enumerator::Lazy.new([1, 2, 3]) }
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end
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def test_each_args
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a = Step.new(1..3)
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assert_equal(1, a.lazy.each(4).first)
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assert_equal([4], a.args)
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end
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def test_each_line
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name = lineno = nil
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File.open(__FILE__) do |f|
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f.each("").map do |paragraph|
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paragraph[/\A\s*(.*)/, 1]
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end.find do |line|
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if name = line[/^class\s+(\S+)/, 1]
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lineno = f.lineno
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true
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end
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end
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end
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assert_equal(self.class.name, name)
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assert_operator(lineno, :>, 2)
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name = lineno = nil
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File.open(__FILE__) do |f|
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f.lazy.each("").map do |paragraph|
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paragraph[/\A\s*(.*)/, 1]
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end.find do |line|
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if name = line[/^class\s+(\S+)/, 1]
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lineno = f.lineno
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true
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end
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end
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end
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assert_equal(self.class.name, name)
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assert_equal(2, lineno)
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end
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def test_select
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a = Step.new(1..6)
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assert_equal(4, a.select {|x| x > 3}.first)
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assert_equal(6, a.current)
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assert_equal(4, a.lazy.select {|x| x > 3}.first)
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assert_equal(4, a.current)
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a = Step.new(['word', nil, 1])
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assert_raise(TypeError) {a.select {|x| "x"+x}.first}
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assert_equal(nil, a.current)
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assert_equal("word", a.lazy.select {|x| "x"+x}.first)
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assert_equal("word", a.current)
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end
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def test_select_multiple_values
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e = Enumerator.new { |yielder|
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for i in 1..5
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yielder.yield(i, i.to_s)
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end
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}
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assert_equal([[2, "2"], [4, "4"]],
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e.select {|x| x[0] % 2 == 0})
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assert_equal([[2, "2"], [4, "4"]],
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e.lazy.select {|x| x[0] % 2 == 0}.force)
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end
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def test_map
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a = Step.new(1..3)
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assert_equal(2, a.map {|x| x * 2}.first)
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assert_equal(3, a.current)
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assert_equal(2, a.lazy.map {|x| x * 2}.first)
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assert_equal(1, a.current)
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end
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def test_flat_map
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a = Step.new(1..3)
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assert_equal(2, a.flat_map {|x| [x * 2]}.first)
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assert_equal(3, a.current)
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assert_equal(2, a.lazy.flat_map {|x| [x * 2]}.first)
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assert_equal(1, a.current)
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end
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def test_flat_map_nested
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a = Step.new(1..3)
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assert_equal([1, "a"],
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a.flat_map {|x| ("a".."c").map {|y| [x, y]}}.first)
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assert_equal(3, a.current)
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assert_equal([1, "a"],
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a.lazy.flat_map {|x| ("a".."c").lazy.map {|y| [x, y]}}.first)
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assert_equal(1, a.current)
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end
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def test_flat_map_to_ary
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to_ary = Class.new {
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def initialize(value)
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@value = value
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end
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def to_ary
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[:to_ary, @value]
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end
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}
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assert_equal([:to_ary, 1, :to_ary, 2, :to_ary, 3],
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[1, 2, 3].flat_map {|x| to_ary.new(x)})
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assert_equal([:to_ary, 1, :to_ary, 2, :to_ary, 3],
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[1, 2, 3].lazy.flat_map {|x| to_ary.new(x)}.force)
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end
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def test_flat_map_non_array
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assert_equal(["1", "2", "3"], [1, 2, 3].flat_map {|x| x.to_s})
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assert_equal(["1", "2", "3"], [1, 2, 3].lazy.flat_map {|x| x.to_s}.force)
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end
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def test_flat_map_hash
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assert_equal([{?a=>97}, {?b=>98}, {?c=>99}], [?a, ?b, ?c].flat_map {|x| {x=>x.ord}})
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assert_equal([{?a=>97}, {?b=>98}, {?c=>99}], [?a, ?b, ?c].lazy.flat_map {|x| {x=>x.ord}}.force)
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end
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def test_reject
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a = Step.new(1..6)
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assert_equal(4, a.reject {|x| x < 4}.first)
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assert_equal(6, a.current)
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assert_equal(4, a.lazy.reject {|x| x < 4}.first)
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assert_equal(4, a.current)
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a = Step.new(['word', nil, 1])
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assert_equal(nil, a.reject {|x| x}.first)
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assert_equal(1, a.current)
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assert_equal(nil, a.lazy.reject {|x| x}.first)
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assert_equal(nil, a.current)
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end
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def test_reject_multiple_values
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e = Enumerator.new { |yielder|
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for i in 1..5
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yielder.yield(i, i.to_s)
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end
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}
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assert_equal([[2, "2"], [4, "4"]],
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e.reject {|x| x[0] % 2 != 0})
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assert_equal([[2, "2"], [4, "4"]],
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e.lazy.reject {|x| x[0] % 2 != 0}.force)
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end
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def test_grep
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a = Step.new('a'..'f')
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assert_equal('c', a.grep(/c/).first)
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assert_equal('f', a.current)
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assert_equal('c', a.lazy.grep(/c/).first)
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assert_equal('c', a.current)
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assert_equal(%w[a e], a.grep(proc {|x| /[aeiou]/ =~ x}))
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assert_equal(%w[a e], a.lazy.grep(proc {|x| /[aeiou]/ =~ x}).to_a)
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end
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def test_grep_with_block
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a = Step.new('a'..'f')
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assert_equal('C', a.grep(/c/) {|i| i.upcase}.first)
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assert_equal('C', a.lazy.grep(/c/) {|i| i.upcase}.first)
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end
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def test_grep_multiple_values
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e = Enumerator.new { |yielder|
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3.times { |i|
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yielder.yield(i, i.to_s)
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}
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}
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assert_equal([[2, "2"]], e.grep(proc {|x| x == [2, "2"]}))
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assert_equal([[2, "2"]], e.lazy.grep(proc {|x| x == [2, "2"]}).force)
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assert_equal(["22"],
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e.lazy.grep(proc {|x| x == [2, "2"]}, &:join).force)
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end
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def test_zip
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a = Step.new(1..3)
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assert_equal([1, "a"], a.zip("a".."c").first)
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assert_equal(3, a.current)
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assert_equal([1, "a"], a.lazy.zip("a".."c").first)
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assert_equal(1, a.current)
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end
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def test_zip_short_arg
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a = Step.new(1..5)
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assert_equal([5, nil], a.zip("a".."c").last)
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assert_equal([5, nil], a.lazy.zip("a".."c").force.last)
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end
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def test_zip_without_arg
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a = Step.new(1..3)
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assert_equal([1], a.zip.first)
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assert_equal(3, a.current)
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assert_equal([1], a.lazy.zip.first)
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assert_equal(1, a.current)
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end
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def test_zip_bad_arg
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a = Step.new(1..3)
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assert_raise(TypeError){ a.lazy.zip(42) }
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end
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def test_zip_with_block
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# zip should be eager when a block is given
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a = Step.new(1..3)
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ary = []
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assert_equal(nil, a.lazy.zip("a".."c") {|x, y| ary << [x, y]})
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assert_equal(a.zip("a".."c"), ary)
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assert_equal(3, a.current)
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end
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def test_take
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a = Step.new(1..10)
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assert_equal(1, a.take(5).first)
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assert_equal(5, a.current)
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assert_equal(1, a.lazy.take(5).first)
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assert_equal(1, a.current)
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assert_equal((1..5).to_a, a.lazy.take(5).force)
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assert_equal(5, a.current)
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a = Step.new(1..10)
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assert_equal([], a.lazy.take(0).force)
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assert_equal(nil, a.current)
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end
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def test_take_recycle
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bug6428 = '[ruby-dev:45634]'
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a = Step.new(1..10)
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take5 = a.lazy.take(5)
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assert_equal((1..5).to_a, take5.force, bug6428)
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assert_equal((1..5).to_a, take5.force, bug6428)
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end
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def test_take_nested
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bug7696 = '[ruby-core:51470]'
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a = Step.new(1..10)
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take5 = a.lazy.take(5)
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assert_equal([*(1..5)]*5, take5.flat_map{take5}.force, bug7696)
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end
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def test_drop_while_nested
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bug7696 = '[ruby-core:51470]'
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a = Step.new(1..10)
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drop5 = a.lazy.drop_while{|x| x < 6}
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assert_equal([*(6..10)]*5, drop5.flat_map{drop5}.force, bug7696)
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end
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def test_drop_nested
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bug7696 = '[ruby-core:51470]'
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a = Step.new(1..10)
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drop5 = a.lazy.drop(5)
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assert_equal([*(6..10)]*5, drop5.flat_map{drop5}.force, bug7696)
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end
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def test_zip_nested
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bug7696 = '[ruby-core:51470]'
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enum = ('a'..'z').each
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enum.next
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zip = (1..3).lazy.zip(enum, enum)
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assert_equal([[1, 'a', 'a'], [2, 'b', 'b'], [3, 'c', 'c']]*3, zip.flat_map{zip}.force, bug7696)
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end
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def test_zip_lazy_on_args
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zip = Step.new(1..2).lazy.zip(42..Float::INFINITY)
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assert_equal [[1, 42], [2, 43]], zip.force
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end
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def test_zip_efficient_on_array_args
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ary = [42, :foo]
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%i[to_enum enum_for lazy each].each do |forbid|
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ary.define_singleton_method(forbid){ fail "#{forbid} was called"}
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end
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zip = Step.new(1..2).lazy.zip(ary)
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assert_equal [[1, 42], [2, :foo]], zip.force
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end
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def test_take_rewound
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bug7696 = '[ruby-core:51470]'
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e=(1..42).lazy.take(2)
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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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end
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def test_take_while
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a = Step.new(1..10)
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assert_equal(1, a.take_while {|i| i < 5}.first)
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assert_equal(5, a.current)
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assert_equal(1, a.lazy.take_while {|i| i < 5}.first)
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assert_equal(1, a.current)
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assert_equal((1..4).to_a, a.lazy.take_while {|i| i < 5}.to_a)
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end
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def test_drop
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a = Step.new(1..10)
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assert_equal(6, a.drop(5).first)
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assert_equal(10, a.current)
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assert_equal(6, a.lazy.drop(5).first)
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assert_equal(6, a.current)
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assert_equal((6..10).to_a, a.lazy.drop(5).to_a)
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end
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def test_drop_while
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a = Step.new(1..10)
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assert_equal(5, a.drop_while {|i| i % 5 > 0}.first)
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assert_equal(10, a.current)
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assert_equal(5, a.lazy.drop_while {|i| i % 5 > 0}.first)
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assert_equal(5, a.current)
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assert_equal((5..10).to_a, a.lazy.drop_while {|i| i % 5 > 0}.to_a)
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end
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def test_drop_and_take
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assert_equal([4, 5], (1..Float::INFINITY).lazy.drop(3).take(2).to_a)
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end
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def test_cycle
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a = Step.new(1..3)
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assert_equal("1", a.cycle(2).map(&:to_s).first)
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assert_equal(3, a.current)
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assert_equal("1", a.lazy.cycle(2).map(&:to_s).first)
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assert_equal(1, a.current)
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end
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def test_cycle_with_block
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# cycle should be eager when a block is given
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a = Step.new(1..3)
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ary = []
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assert_equal(nil, a.lazy.cycle(2) {|i| ary << i})
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assert_equal(a.cycle(2).to_a, ary)
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assert_equal(3, a.current)
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end
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def test_cycle_chain
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a = 1..3
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assert_equal([1,2,3,1,2,3,1,2,3,1], a.lazy.cycle.take(10).force)
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assert_equal([2,2,2,2,2,2,2,2,2,2], a.lazy.cycle.select {|x| x == 2}.take(10).force)
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assert_equal([2,2,2,2,2,2,2,2,2,2], a.lazy.select {|x| x == 2}.cycle.take(10).force)
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end
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def test_force
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assert_equal([1, 2, 3], (1..Float::INFINITY).lazy.take(3).force)
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end
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def test_inspect
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assert_equal("#<Enumerator::Lazy: 1..10>", (1..10).lazy.inspect)
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assert_equal('#<Enumerator::Lazy: #<Enumerator: "foo":each_char>>',
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"foo".each_char.lazy.inspect)
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assert_equal("#<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:map>",
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(1..10).lazy.map {}.inspect)
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assert_equal("#<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:take(0)>",
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(1..10).lazy.take(0).inspect)
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assert_equal("#<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:take(3)>",
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(1..10).lazy.take(3).inspect)
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assert_equal('#<Enumerator::Lazy: #<Enumerator::Lazy: "a".."c">:grep(/b/)>',
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("a".."c").lazy.grep(/b/).inspect)
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assert_equal("#<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:cycle(3)>",
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(1..10).lazy.cycle(3).inspect)
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assert_equal("#<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:cycle>",
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(1..10).lazy.cycle.inspect)
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assert_equal("#<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:cycle(3)>",
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(1..10).lazy.cycle(3).inspect)
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l = (1..10).lazy.map {}.collect {}.flat_map {}.collect_concat {}.select {}.find_all {}.reject {}.grep(1).zip(?a..?c).take(10).take_while {}.drop(3).drop_while {}.cycle(3)
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assert_equal(<<EOS.chomp, l.inspect)
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#<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: 1..10>:map>:collect>:flat_map>:collect_concat>:select>:find_all>:reject>:grep(1)>:zip("a".."c")>:take(10)>:take_while>:drop(3)>:drop_while>:cycle(3)>
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EOS
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end
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def test_lazy_to_enum
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lazy = [1, 2, 3].lazy
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def lazy.foo(*args)
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yield args
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yield args
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end
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enum = lazy.to_enum(:foo, :hello, :world)
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assert_equal Enumerator::Lazy, enum.class
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assert_equal nil, enum.size
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assert_equal [[:hello, :world], [:hello, :world]], enum.to_a
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assert_equal [1, 2, 3], lazy.to_enum.to_a
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end
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def test_size
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lazy = [1, 2, 3].lazy
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assert_equal 3, lazy.size
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assert_equal 42, Enumerator::Lazy.new([],->{42}){}.size
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assert_equal 42, Enumerator::Lazy.new([],42){}.size
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assert_equal 42, Enumerator::Lazy.new([],42){}.lazy.size
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assert_equal 42, lazy.to_enum{ 42 }.size
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%i[map collect].each do |m|
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assert_equal 3, lazy.send(m){}.size
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end
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assert_equal 3, lazy.zip([4]).size
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%i[flat_map collect_concat select find_all reject take_while drop_while].each do |m|
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assert_equal nil, lazy.send(m){}.size
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end
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assert_equal nil, lazy.grep(//).size
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assert_equal 2, lazy.take(2).size
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assert_equal 3, lazy.take(4).size
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assert_equal 4, loop.lazy.take(4).size
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assert_equal nil, lazy.select{}.take(4).size
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assert_equal 1, lazy.drop(2).size
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assert_equal 0, lazy.drop(4).size
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assert_equal Float::INFINITY, loop.lazy.drop(4).size
|
|
assert_equal nil, lazy.select{}.drop(4).size
|
|
|
|
assert_equal 0, lazy.cycle(0).size
|
|
assert_equal 6, lazy.cycle(2).size
|
|
assert_equal 3 << 80, 4.times.inject(lazy){|enum| enum.cycle(1 << 20)}.size
|
|
assert_equal Float::INFINITY, lazy.cycle.size
|
|
assert_equal Float::INFINITY, loop.lazy.cycle(4).size
|
|
assert_equal Float::INFINITY, loop.lazy.cycle.size
|
|
assert_equal nil, lazy.select{}.cycle(4).size
|
|
assert_equal nil, lazy.select{}.cycle.size
|
|
end
|
|
|
|
def test_map_zip
|
|
bug7507 = '[ruby-core:50545]'
|
|
assert_ruby_status(["-e", "GC.stress = true", "-e", "(1..10).lazy.map{}.zip(){}"], "", bug7507)
|
|
assert_ruby_status(["-e", "GC.stress = true", "-e", "(1..10).lazy.map{}.zip().to_a"], "", bug7507)
|
|
end
|
|
|
|
def test_require_block
|
|
%i[select reject drop_while take_while map flat_map].each do |method|
|
|
assert_raise(ArgumentError){ [].lazy.send(method) }
|
|
end
|
|
end
|
|
|
|
def test_laziness_conservation
|
|
bug7507 = '[ruby-core:51510]'
|
|
{
|
|
slice_before: //,
|
|
with_index: nil,
|
|
cycle: nil,
|
|
each_with_object: 42,
|
|
each_slice: 42,
|
|
each_entry: nil,
|
|
each_cons: 42,
|
|
}.each do |method, arg|
|
|
assert_equal Enumerator::Lazy, [].lazy.send(method, *arg).class, bug7507
|
|
end
|
|
assert_equal Enumerator::Lazy, [].lazy.chunk{}.class, bug7507
|
|
end
|
|
|
|
def test_no_warnings
|
|
le = (1..3).lazy
|
|
assert_warning("") {le.zip([4,5,6]).force}
|
|
assert_warning("") {le.zip(4..6).force}
|
|
assert_warning("") {le.take(1).force}
|
|
assert_warning("") {le.drop(1).force}
|
|
assert_warning("") {le.drop_while{false}.force}
|
|
end
|
|
end
|