1 | @obj = Object.new
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2 | class << @obj
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3 | include Enumerable
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4 | def foo *a
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5 | a.each { |x| yield x }
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6 | end
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7 | end
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8 |
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9 | def assert_take(exp, enumerator)
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10 | result = []
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11 | n = exp.size
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12 | enumerator.each do |v|
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13 | result << v
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14 | n -= 1
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15 | break if n == 0
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16 | end if n > 0
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17 | assert_equal exp, result
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18 | end
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19 |
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20 | assert 'Enumerator.class' do
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21 | assert_equal Class, Enumerator.class
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22 | end
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23 |
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24 | assert 'Enumerator.superclass' do
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25 | assert_equal Object, Enumerator.superclass
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26 | end
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27 |
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28 | assert 'Enumerator.new' do
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29 | assert_equal [0,1,2], 3.times.map{|i| i}.sort
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30 | assert_equal [:x,:y,:z], [:x,:y,:z].each.map{|i| i}.sort
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31 | assert_equal [[:x,1],[:y,2]], {x:1, y:2}.each.map{|i| i}.sort
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32 | assert_equal [1,2,3], @obj.to_enum(:foo, 1,2,3).to_a
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33 | assert_take [1,2,3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }
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34 | assert_raise(ArgumentError) { Enumerator.new }
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35 |
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36 | # examples
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37 | fib = Enumerator.new do |y|
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38 | a = b = 1
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39 | loop do
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40 | y << a
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41 | a, b = b, a + b
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42 | end
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43 | end
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44 | assert_take [1,1,2,3,5,8,13,21,34,55], fib
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45 | end
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46 |
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47 | assert 'Enumerator#initialize_copy' do
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48 | assert_equal [1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).dup.to_a
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49 | e = @obj.to_enum :foo, 1, 2, 3
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50 | assert_nothing_raised { assert_equal(1, e.next) }
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51 | assert_raise(TypeError) { e.dup }
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52 |
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53 | e = Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.dup
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54 | assert_nothing_raised { assert_equal(1, e.next) }
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55 | assert_raise(TypeError) { e.dup }
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56 | end
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57 |
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58 | assert 'Enumerator#with_index' do
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59 | assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).with_index.to_a)
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60 | assert_equal([[1,5],[2,6],[3,7]], @obj.to_enum(:foo, 1, 2, 3).with_index(5).to_a)
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61 | a = []
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62 | @obj.to_enum(:foo, 1, 2, 3).with_index(10).with_index(20) { |*i| a << i }
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63 | assert_equal [[[1, 10], 20], [[2, 11], 21], [[3, 12], 22]], a
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64 | end
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65 |
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66 | assert 'Enumerator#with_index string offset' do
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67 | assert_raise(TypeError){ @obj.to_enum(:foo, 1, 2, 3).with_index('1').to_a }
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68 | end
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69 |
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70 | assert 'Enumerator#each_with_index' do
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71 | assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).each_with_index.to_a)
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72 | a = []
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73 | @obj.to_enum(:foo, 1, 2, 3).each_with_index {|*i| a << i}
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74 | assert_equal([[1, 0], [2, 1], [3, 2]], a)
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75 | end
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76 |
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77 | assert 'Enumerator#with_object' do
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78 | obj = [0, 1]
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79 | ret = (1..10).each.with_object(obj) {|i, memo|
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80 | memo[0] += i
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81 | memo[1] *= i
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82 | }
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83 | assert_true(obj.equal?(ret))
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84 | assert_equal([55, 3628800], ret)
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85 | end
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86 |
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87 | assert 'Enumerator#with_object arguments' do
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88 | to_three = Enumerator.new do |y|
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89 | 3.times do |x|
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90 | y << x
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91 | end
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92 | end
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93 |
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94 | a = []
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95 | to_three_with_string = to_three.with_object("foo")
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96 | to_three_with_string.each do |x,string|
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97 | a << "#{string}:#{x}"
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98 | end
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99 | assert_equal ["foo:0","foo:1","foo:2"], a
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100 | end
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101 |
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102 | assert 'Enumerator#inspect' do
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103 | e = (0..10).each
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104 | assert_equal('#<Enumerator: 0..10:each>', e.inspect)
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105 | e = 'FooObject'.enum_for(:foo, 1)
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106 | assert_equal('#<Enumerator: "FooObject":foo(1)>', e.inspect)
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107 | e = 'FooObject'.enum_for(:foo, 1, 2, 3)
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108 | assert_equal('#<Enumerator: "FooObject":foo(1, 2, 3)>', e.inspect)
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109 | e = nil.enum_for(:to_s)
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110 | assert_equal('#<Enumerator: nil:to_s>', e.inspect)
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111 | end
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112 |
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113 | assert 'Enumerator#each' do
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114 | o = Object.new
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115 | def o.each(ary)
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116 | ary << 1
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117 | yield
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118 | end
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119 | ary = []
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120 | e = o.to_enum.each(ary)
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121 | e.next
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122 | assert_equal([1], ary)
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123 | end
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124 |
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125 | assert 'Enumerator#each arguments' do
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126 | obj = Object.new
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127 |
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128 | def obj.each_arg(a, b=:b, *rest)
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129 | yield a
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130 | yield b
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131 | yield rest
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132 | :method_returned
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133 | end
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134 |
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135 | enum = obj.to_enum :each_arg, :a, :x
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136 |
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137 | assert_equal [:a, :x, []], enum.each.to_a
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138 | assert_true enum.each.equal?(enum)
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139 | assert_equal :method_returned, enum.each { |elm| elm }
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140 |
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141 | assert_equal [:a, :x, [:y, :z]], enum.each(:y, :z).to_a
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142 | assert_false enum.each(:y, :z).equal?(enum)
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143 | assert_equal :method_returned, enum.each(:y, :z) { |elm| elm }
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144 | end
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145 |
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146 | assert 'Enumerator#next' do
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147 | e = 3.times
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148 | 3.times { |i|
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149 | assert_equal i, e.next
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150 | }
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151 | assert_raise(StopIteration) { e.next }
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152 | end
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153 |
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154 | assert 'Enumerator#next_values' do
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155 | o = Object.new
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156 | def o.each
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157 | yield
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158 | yield 1
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159 | yield 1, 2
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160 | end
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161 | e = o.to_enum
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162 | assert_equal nil, e.next
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163 | assert_equal 1, e.next
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164 | assert_equal [1,2], e.next
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165 | e = o.to_enum
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166 | assert_equal [], e.next_values
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167 | assert_equal [1], e.next_values
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168 | assert_equal [1,2], e.next_values
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169 | end
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170 |
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171 | assert 'Enumerator#peek' do
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172 | a = [1]
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173 | e = a.each
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174 | assert_equal 1, e.peek
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175 | assert_equal 1, e.peek
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176 | assert_equal 1, e.next
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177 | assert_raise(StopIteration) { e.peek }
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178 | assert_raise(StopIteration) { e.peek }
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179 | end
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180 |
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181 | assert 'Enumerator#peek modify' do
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182 | o = Object.new
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183 | def o.each
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184 | yield 1,2
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185 | end
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186 | e = o.to_enum
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187 | a = e.peek
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188 | a << 3
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189 | assert_equal([1,2], e.peek)
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190 | end
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191 |
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192 | assert 'Enumerator#peek_values' do
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193 | o = Object.new
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194 | def o.each
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195 | yield
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196 | yield 1
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197 | yield 1, 2
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198 | end
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199 | e = o.to_enum
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200 | assert_equal nil, e.peek
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201 | assert_equal nil, e.next
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202 | assert_equal 1, e.peek
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203 | assert_equal 1, e.next
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204 | assert_equal [1,2], e.peek
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205 | assert_equal [1,2], e.next
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206 | e = o.to_enum
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207 | assert_equal [], e.peek_values
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208 | assert_equal [], e.next_values
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209 | assert_equal [1], e.peek_values
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210 | assert_equal [1], e.next_values
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211 | assert_equal [1,2], e.peek_values
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212 | assert_equal [1,2], e.next_values
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213 | e = o.to_enum
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214 | assert_equal [], e.peek_values
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215 | assert_equal nil, e.next
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216 | assert_equal [1], e.peek_values
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217 | assert_equal 1, e.next
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218 | assert_equal [1,2], e.peek_values
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219 | assert_equal [1,2], e.next
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220 | e = o.to_enum
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221 | assert_equal nil, e.peek
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222 | assert_equal [], e.next_values
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223 | assert_equal 1, e.peek
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224 | assert_equal [1], e.next_values
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225 | assert_equal [1,2], e.peek
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226 | assert_equal [1,2], e.next_values
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227 | end
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228 |
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229 | assert 'Enumerator#peek_values modify' do
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230 | o = Object.new
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231 | def o.each
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232 | yield 1,2
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233 | end
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234 | e = o.to_enum
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235 | a = e.peek_values
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236 | a << 3
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237 | assert_equal [1,2], e.peek
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238 | end
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239 |
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240 | assert 'Enumerator#feed' do
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241 | o = Object.new
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242 | def o.each(ary)
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243 | ary << yield
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244 | ary << yield
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245 | ary << yield
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246 | end
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247 | ary = []
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248 | e = o.to_enum :each, ary
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249 | e.next
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250 | e.feed 1
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251 | e.next
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252 | e.feed 2
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253 | e.next
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254 | e.feed 3
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255 | assert_raise(StopIteration) { e.next }
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256 | assert_equal [1,2,3], ary
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257 | end
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258 |
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259 | assert 'Enumerator#feed mixed' do
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260 | o = Object.new
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261 | def o.each(ary)
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262 | ary << yield
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263 | ary << yield
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264 | ary << yield
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265 | end
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266 | ary = []
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267 | e = o.to_enum :each, ary
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268 | e.next
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269 | e.feed 1
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270 | e.next
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271 | e.next
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272 | e.feed 3
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273 | assert_raise(StopIteration) { e.next }
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274 | assert_equal [1,nil,3], ary
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275 | end
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276 |
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277 | assert 'Enumerator#feed twice' do
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278 | o = Object.new
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279 | def o.each(ary)
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280 | ary << yield
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281 | ary << yield
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282 | ary << yield
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283 | end
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284 | ary = []
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285 | e = o.to_enum :each, ary
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286 | e.feed 1
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287 | assert_raise(TypeError) { e.feed 2 }
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288 | end
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289 |
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290 | assert 'Enumerator#feed before first next' do
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291 | o = Object.new
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292 | def o.each(ary)
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293 | ary << yield
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294 | ary << yield
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295 | ary << yield
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296 | end
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297 | ary = []
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298 | e = o.to_enum :each, ary
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299 | e.feed 1
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300 | e.next
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301 | e.next
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302 | assert_equal [1], ary
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303 | end
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304 |
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305 | assert 'Enumerator#feed yielder' do
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306 | x = nil
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307 | e = Enumerator.new {|y| x = y.yield; 10 }
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308 | e.next
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309 | e.feed 100
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310 | assert_raise(StopIteration) { e.next }
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311 | assert_equal 100, x
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312 | end
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313 |
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314 | assert 'Enumerator#rewind' do
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315 | e = @obj.to_enum(:foo, 1, 2, 3)
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316 | assert_equal 1, e.next
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317 | assert_equal 2, e.next
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318 | e.rewind
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319 | assert_equal 1, e.next
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320 | assert_equal 2, e.next
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321 | assert_equal 3, e.next
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322 | assert_raise(StopIteration) { e.next }
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323 | end
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324 |
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325 | assert 'Enumerator#rewind clear feed' do
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326 | o = Object.new
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327 | def o.each(ary)
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328 | ary << yield
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329 | ary << yield
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330 | ary << yield
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331 | end
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332 | ary = []
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333 | e = o.to_enum(:each, ary)
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334 | e.next
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335 | e.feed 1
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336 | e.next
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337 | e.feed 2
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338 | e.rewind
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339 | e.next
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340 | e.next
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341 | assert_equal([1,nil], ary)
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342 | end
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343 |
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344 | assert 'Enumerator#rewind clear' do
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345 | o = Object.new
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346 | def o.each(ary)
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347 | ary << yield
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348 | ary << yield
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349 | ary << yield
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350 | end
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351 | ary = []
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352 | e = o.to_enum :each, ary
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353 | e.next
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354 | e.feed 1
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355 | e.next
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356 | e.feed 2
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357 | e.rewind
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358 | e.next
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359 | e.next
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360 | assert_equal [1,nil], ary
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361 | end
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362 |
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363 | assert 'Enumerator::Generator' do
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364 | # note: Enumerator::Generator is a class just for internal
|
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365 | g = Enumerator::Generator.new {|y| y << 1 << 2 << 3; :foo }
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366 | g2 = g.dup
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367 | a = []
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368 | assert_equal(:foo, g.each {|x| a << x })
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369 | assert_equal([1, 2, 3], a)
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370 | a = []
|
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371 | assert_equal(:foo, g2.each {|x| a << x })
|
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372 | assert_equal([1, 2, 3], a)
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373 | end
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374 |
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375 | assert 'Enumerator::Generator args' do
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376 | g = Enumerator::Generator.new {|y, x| y << 1 << 2 << 3; x }
|
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377 | a = []
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378 | assert_equal(:bar, g.each(:bar) {|x| a << x })
|
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379 | assert_equal([1, 2, 3], a)
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380 | end
|
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381 |
|
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382 | assert 'Enumerator::Yielder' do
|
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383 | # note: Enumerator::Yielder is a class just for internal
|
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384 | a = []
|
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385 | y = Enumerator::Yielder.new {|x| a << x }
|
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386 | assert_equal(y, y << 1 << 2 << 3)
|
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387 | assert_equal([1, 2, 3], a)
|
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388 |
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389 | a = []
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390 | y = Enumerator::Yielder.new {|x| a << x }
|
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391 | assert_equal([1], y.yield(1))
|
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392 | assert_equal([1, 2], y.yield(2))
|
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393 | assert_equal([1, 2, 3], y.yield(3))
|
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394 |
|
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395 | assert_raise(LocalJumpError) { Enumerator::Yielder.new }
|
---|
396 | end
|
---|
397 |
|
---|
398 | assert 'next after StopIteration' do
|
---|
399 | a = [1]
|
---|
400 | e = a.each
|
---|
401 | assert_equal(1, e.next)
|
---|
402 | assert_raise(StopIteration) { e.next }
|
---|
403 | assert_raise(StopIteration) { e.next }
|
---|
404 | e.rewind
|
---|
405 | assert_equal(1, e.next)
|
---|
406 | assert_raise(StopIteration) { e.next }
|
---|
407 | assert_raise(StopIteration) { e.next }
|
---|
408 | end
|
---|
409 |
|
---|
410 | assert 'gc' do
|
---|
411 | assert_nothing_raised do
|
---|
412 | 1.times do
|
---|
413 | foo = [1,2,3].to_enum
|
---|
414 | GC.start
|
---|
415 | end
|
---|
416 | GC.start
|
---|
417 | end
|
---|
418 | end
|
---|
419 |
|
---|
420 | assert 'nested iteration' do
|
---|
421 | def (o = Object.new).each
|
---|
422 | yield :ok1
|
---|
423 | yield [:ok2, :x].each.next
|
---|
424 | end
|
---|
425 | e = o.to_enum
|
---|
426 | assert_equal :ok1, e.next
|
---|
427 | assert_equal :ok2, e.next
|
---|
428 | assert_raise(StopIteration) { e.next }
|
---|
429 | end
|
---|
430 |
|
---|
431 | assert 'Kernel#to_enum' do
|
---|
432 | e = nil
|
---|
433 | assert_equal Enumerator, [].to_enum.class
|
---|
434 | assert_nothing_raised { e = [].to_enum(:_not_implemented_) }
|
---|
435 | assert_raise(NoMethodError) { e.first }
|
---|
436 | end
|
---|
437 |
|
---|
438 | assert 'modifying existing methods' do
|
---|
439 | assert_equal Enumerator, loop.class
|
---|
440 | e = 3.times
|
---|
441 | i = 0
|
---|
442 | loop_ret = loop {
|
---|
443 | assert_equal i, e.next
|
---|
444 | i += 1
|
---|
445 | }
|
---|
446 | end
|
---|
447 |
|
---|
448 | assert 'Integral#times' do
|
---|
449 | a = 3
|
---|
450 | b = a.times
|
---|
451 | c = []
|
---|
452 | b.with_object(c) do |i, obj|
|
---|
453 | obj << i
|
---|
454 | end
|
---|
455 | assert_equal 3, a
|
---|
456 | assert_equal Enumerator, b.class
|
---|
457 | assert_equal [0,1,2], c
|
---|
458 | end
|
---|
459 |
|
---|
460 | assert 'Enumerable#each_with_index' do
|
---|
461 | assert_equal [['a',0],['b',1],['c',2]], ['a','b','c'].each_with_index.to_a
|
---|
462 | end
|
---|
463 |
|
---|
464 | assert 'Enumerable#map' do
|
---|
465 | a = [1,2,3]
|
---|
466 | b = a.map
|
---|
467 | c = b.with_index do |i, index|
|
---|
468 | [i*i, index*index]
|
---|
469 | end
|
---|
470 | assert_equal [1,2,3], a
|
---|
471 | assert_equal [[1,0],[4,1],[9,4]], c
|
---|
472 | end
|
---|
473 |
|
---|
474 | assert 'Enumerable#find_all' do
|
---|
475 | assert_equal [[3,4]], [[1,2],[3,4],[5,6]].find_all.each{ |i| i[1] == 4 }
|
---|
476 | end
|
---|
477 |
|
---|
478 | assert 'Array#each_index' do
|
---|
479 | a = [1,2,3]
|
---|
480 | b = a.each_index
|
---|
481 | c = []
|
---|
482 | b.with_index do |index1,index2|
|
---|
483 | c << [index1+2,index2+5]
|
---|
484 | end
|
---|
485 | assert_equal [1,2,3], a
|
---|
486 | assert_equal [[2,5],[3,6],[4,7]], c
|
---|
487 | end
|
---|
488 |
|
---|
489 | assert 'Array#map!' do
|
---|
490 | a = [1,2,3]
|
---|
491 | b = a.map!
|
---|
492 | b.with_index do |i, index|
|
---|
493 | [i*i, index*index]
|
---|
494 | end
|
---|
495 | assert_equal [[1,0],[4,1],[9,4]], a
|
---|
496 | end
|
---|
497 |
|
---|
498 | assert 'Hash#each' do
|
---|
499 | a = {a:1,b:2}
|
---|
500 | b = a.each
|
---|
501 | c = []
|
---|
502 | b.each do |k,v|
|
---|
503 | c << [k,v]
|
---|
504 | end
|
---|
505 | assert_equal [[:a,1], [:b,2]], c.sort
|
---|
506 | end
|
---|
507 |
|
---|
508 | assert 'Hash#each_key' do
|
---|
509 | assert_equal [:a,:b], {a:1,b:2}.each_key.to_a.sort
|
---|
510 | end
|
---|
511 |
|
---|
512 | assert 'Hash#each_value' do
|
---|
513 | assert_equal [1,2], {a:1,b:2}.each_value.to_a.sort
|
---|
514 | end
|
---|
515 |
|
---|
516 | assert 'Hash#select' do
|
---|
517 | h = {1=>2,3=>4,5=>6}
|
---|
518 | hret = h.select.with_index {|a,_b| a[1] == 4}
|
---|
519 | assert_equal({3=>4}, hret)
|
---|
520 | assert_equal({1=>2,3=>4,5=>6}, h)
|
---|
521 | end
|
---|
522 |
|
---|
523 | assert 'Hash#select!' do
|
---|
524 | h = {1=>2,3=>4,5=>6}
|
---|
525 | hret = h.select!.with_index {|a,_b| a[1] == 4}
|
---|
526 | assert_equal h, hret
|
---|
527 | assert_equal({3=>4}, h)
|
---|
528 | end
|
---|
529 |
|
---|
530 | assert 'Hash#reject' do
|
---|
531 | h = {1=>2,3=>4,5=>6}
|
---|
532 | hret = h.reject.with_index {|a,_b| a[1] == 4}
|
---|
533 | assert_equal({1=>2,5=>6}, hret)
|
---|
534 | assert_equal({1=>2,3=>4,5=>6}, h)
|
---|
535 | end
|
---|
536 |
|
---|
537 | assert 'Hash#reject!' do
|
---|
538 | h = {1=>2,3=>4,5=>6}
|
---|
539 | hret = h.reject!.with_index {|a,_b| a[1] == 4}
|
---|
540 | assert_equal h, hret
|
---|
541 | assert_equal({1=>2,5=>6}, h)
|
---|
542 | end
|
---|
543 |
|
---|
544 | assert 'Range#each' do
|
---|
545 | a = (1..5)
|
---|
546 | b = a.each
|
---|
547 | c = []
|
---|
548 | b.each do |i|
|
---|
549 | c << i
|
---|
550 | end
|
---|
551 | assert_equal [1,2,3,4,5], c
|
---|
552 | end
|
---|
553 |
|
---|
554 | assert 'Enumerable#zip' do
|
---|
555 | assert_equal [[1, 10], [2, 11], [3, 12]], [1,2,3].zip(10..Float::INFINITY)
|
---|
556 |
|
---|
557 | ret = []
|
---|
558 | assert_equal nil, [1,2,3].zip(10..Float::INFINITY) { |i| ret << i }
|
---|
559 | assert_equal [[1, 10], [2, 11], [3, 12]], ret
|
---|
560 |
|
---|
561 | assert_raise(TypeError) { [1].zip(1) }
|
---|
562 | end
|
---|
563 |
|
---|
564 | assert 'Enumerator.produce' do
|
---|
565 | assert_raise(ArgumentError) { Enumerator.produce }
|
---|
566 |
|
---|
567 | # Without initial object
|
---|
568 | passed_args = []
|
---|
569 | enum = Enumerator.produce {|obj| passed_args << obj; (obj || 0).succ }
|
---|
570 | assert_equal Enumerator, enum.class
|
---|
571 | assert_take [1, 2, 3], enum
|
---|
572 | assert_equal [nil, 1, 2], passed_args
|
---|
573 |
|
---|
574 | # With initial object
|
---|
575 | passed_args = []
|
---|
576 | enum = Enumerator.produce(1) {|obj| passed_args << obj; obj.succ }
|
---|
577 | assert_take [1, 2, 3], enum
|
---|
578 | assert_equal [1, 2], passed_args
|
---|
579 |
|
---|
580 | # Raising StopIteration
|
---|
581 | words = %w[The quick brown fox jumps over the lazy dog]
|
---|
582 | enum = Enumerator.produce { words.shift or raise StopIteration }
|
---|
583 | assert_equal %w[The quick brown fox jumps over the lazy dog], enum.to_a
|
---|
584 |
|
---|
585 | # Raising StopIteration
|
---|
586 | object = [[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"], "stuv", "wxyz"]
|
---|
587 | enum = Enumerator.produce(object) {|obj|
|
---|
588 | obj.respond_to?(:first) or raise StopIteration
|
---|
589 | obj.first
|
---|
590 | }
|
---|
591 | assert_nothing_raised {
|
---|
592 | assert_equal [
|
---|
593 | [[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"], "stuv", "wxyz"],
|
---|
594 | [[["abc", "def"], "ghi", "jkl"], "mno", "pqr"],
|
---|
595 | [["abc", "def"], "ghi", "jkl"],
|
---|
596 | ["abc", "def"],
|
---|
597 | "abc",
|
---|
598 | ], enum.to_a
|
---|
599 | }
|
---|
600 | end
|
---|