зеркало из https://github.com/github/ruby.git
116 строки
3.4 KiB
Ruby
116 строки
3.4 KiB
Ruby
# frozen_string_literal: true
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require 'tsort'
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require 'test/unit'
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class TSortHash < Hash # :nodoc:
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include TSort
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alias tsort_each_node each_key
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def tsort_each_child(node, &block)
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fetch(node).each(&block)
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end
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end
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class TSortArray < Array # :nodoc:
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include TSort
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alias tsort_each_node each_index
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def tsort_each_child(node, &block)
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fetch(node).each(&block)
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end
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end
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class TSortTest < Test::Unit::TestCase # :nodoc:
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def test_dag
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h = TSortHash[{1=>[2, 3], 2=>[3], 3=>[]}]
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assert_equal([3, 2, 1], h.tsort)
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assert_equal([[3], [2], [1]], h.strongly_connected_components)
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end
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def test_cycle
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h = TSortHash[{1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}]
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assert_equal([[4], [2, 3], [1]],
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h.strongly_connected_components.map {|nodes| nodes.sort})
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assert_raise(TSort::Cyclic) { h.tsort }
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end
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def test_array
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a = TSortArray[[1], [0], [0], [2]]
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assert_equal([[0, 1], [2], [3]],
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a.strongly_connected_components.map {|nodes| nodes.sort})
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a = TSortArray[[], [0]]
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assert_equal([[0], [1]],
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a.strongly_connected_components.map {|nodes| nodes.sort})
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end
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def test_s_tsort
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g = {1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]}
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each_node = lambda {|&b| g.each_key(&b) }
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each_child = lambda {|n, &b| g[n].each(&b) }
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assert_equal([4, 2, 3, 1], TSort.tsort(each_node, each_child))
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g = {1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}
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assert_raise(TSort::Cyclic) { TSort.tsort(each_node, each_child) }
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end
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def test_s_tsort_each
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g = {1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]}
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each_node = lambda {|&b| g.each_key(&b) }
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each_child = lambda {|n, &b| g[n].each(&b) }
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r = []
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TSort.tsort_each(each_node, each_child) {|n| r << n }
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assert_equal([4, 2, 3, 1], r)
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r = TSort.tsort_each(each_node, each_child).map {|n| n.to_s }
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assert_equal(['4', '2', '3', '1'], r)
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end
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def test_s_strongly_connected_components
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g = {1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]}
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each_node = lambda {|&b| g.each_key(&b) }
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each_child = lambda {|n, &b| g[n].each(&b) }
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assert_equal([[4], [2], [3], [1]],
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TSort.strongly_connected_components(each_node, each_child))
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g = {1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}
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assert_equal([[4], [2, 3], [1]],
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TSort.strongly_connected_components(each_node, each_child))
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end
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def test_s_each_strongly_connected_component
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g = {1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]}
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each_node = lambda {|&b| g.each_key(&b) }
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each_child = lambda {|n, &b| g[n].each(&b) }
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r = []
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TSort.each_strongly_connected_component(each_node, each_child) {|scc|
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r << scc
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}
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assert_equal([[4], [2], [3], [1]], r)
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g = {1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}
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r = []
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TSort.each_strongly_connected_component(each_node, each_child) {|scc|
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r << scc
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}
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assert_equal([[4], [2, 3], [1]], r)
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r = TSort.each_strongly_connected_component(each_node, each_child).map {|scc|
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scc.map(&:to_s)
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}
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assert_equal([['4'], ['2', '3'], ['1']], r)
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end
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def test_s_each_strongly_connected_component_from
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g = {1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}
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each_child = lambda {|n, &b| g[n].each(&b) }
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r = []
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TSort.each_strongly_connected_component_from(1, each_child) {|scc|
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r << scc
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}
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assert_equal([[4], [2, 3], [1]], r)
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r = TSort.each_strongly_connected_component_from(1, each_child).map {|scc|
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scc.map(&:to_s)
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}
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assert_equal([['4'], ['2', '3'], ['1']], r)
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end
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end
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