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require 'spec_helper'
describe Immutable::List do
let(:list) { L[1,2,3,4] }
let(:big) { (1..10000).to_list }
[:slice, :[]].each do |method|
describe "##{method}" do
context 'when passed a positive integral index' do
it 'returns the element at that index' do
list.send(method, 0).should be(1)
list.send(method, 1).should be(2)
list.send(method, 2).should be(3)
list.send(method, 3).should be(4)
list.send(method, 4).should be(nil)
list.send(method, 10).should be(nil)
big.send(method, 0).should be(1)
big.send(method, 9999).should be(10000)
end
it 'leaves the original unchanged' do
list.should eql(L[1,2,3,4])
end
end
context 'when passed a negative integral index' do
it 'returns the element which is number (index.abs) counting from the end of the list' do
list.send(method, -1).should be(4)
list.send(method, -2).should be(3)
list.send(method, -3).should be(2)
list.send(method, -4).should be(1)
list.send(method, -5).should be(nil)
list.send(method, -10).should be(nil)
big.send(method, -1).should be(10000)
big.send(method, -10000).should be(1)
end
end
context 'when passed a positive integral index and count' do
it "returns 'count' elements starting from 'index'" do
list.send(method, 0, 0).should eql(L.empty)
list.send(method, 0, 1).should eql(L[1])
list.send(method, 0, 2).should eql(L[1,2])
list.send(method, 0, 4).should eql(L[1,2,3,4])
list.send(method, 0, 6).should eql(L[1,2,3,4])
list.send(method, 0, -1).should be_nil
list.send(method, 0, -2).should be_nil
list.send(method, 0, -4).should be_nil
list.send(method, 2, 0).should eql(L.empty)
list.send(method, 2, 1).should eql(L[3])
list.send(method, 2, 2).should eql(L[3,4])
list.send(method, 2, 4).should eql(L[3,4])
list.send(method, 2, -1).should be_nil
list.send(method, 4, 0).should eql(L.empty)
list.send(method, 4, 2).should eql(L.empty)
list.send(method, 4, -1).should be_nil
list.send(method, 5, 0).should be_nil
list.send(method, 5, 2).should be_nil
list.send(method, 5, -1).should be_nil
list.send(method, 6, 0).should be_nil
list.send(method, 6, 2).should be_nil
list.send(method, 6, -1).should be_nil
big.send(method, 0, 3).should eql(L[1,2,3])
big.send(method, 1023, 4).should eql(L[1024,1025,1026,1027])
big.send(method, 1024, 4).should eql(L[1025,1026,1027,1028])
end
it 'leaves the original unchanged' do
list.should eql(L[1,2,3,4])
end
end
context 'when passed a negative integral index and count' do
it "returns 'count' elements, starting from index which is number 'index.abs' counting from the end of the array" do
list.send(method, -1, 0).should eql(L.empty)
list.send(method, -1, 1).should eql(L[4])
list.send(method, -1, 2).should eql(L[4])
list.send(method, -1, -1).should be_nil
list.send(method, -2, 0).should eql(L.empty)
list.send(method, -2, 1).should eql(L[3])
list.send(method, -2, 2).should eql(L[3,4])
list.send(method, -2, 4).should eql(L[3,4])
list.send(method, -2, -1).should be_nil
list.send(method, -4, 0).should eql(L.empty)
list.send(method, -4, 1).should eql(L[1])
list.send(method, -4, 2).should eql(L[1,2])
list.send(method, -4, 4).should eql(L[1,2,3,4])
list.send(method, -4, 6).should eql(L[1,2,3,4])
list.send(method, -4, -1).should be_nil
list.send(method, -5, 0).should be_nil
list.send(method, -5, 1).should be_nil
list.send(method, -5, 10).should be_nil
list.send(method, -5, -1).should be_nil
big.send(method, -1, 1).should eql(L[10000])
big.send(method, -1, 2).should eql(L[10000])
big.send(method, -6, 2).should eql(L[9995,9996])
end
end
context 'when passed a Range' do
it 'returns the elements whose indexes are within the given Range' do
list.send(method, 0..-1).should eql(L[1,2,3,4])
list.send(method, 0..-10).should eql(L.empty)
list.send(method, 0..0).should eql(L[1])
list.send(method, 0..1).should eql(L[1,2])
list.send(method, 0..2).should eql(L[1,2,3])
list.send(method, 0..3).should eql(L[1,2,3,4])
list.send(method, 0..4).should eql(L[1,2,3,4])
list.send(method, 0..10).should eql(L[1,2,3,4])
list.send(method, 2..-10).should eql(L.empty)
list.send(method, 2..0).should eql(L.empty)
list.send(method, 2..2).should eql(L[3])
list.send(method, 2..3).should eql(L[3,4])
list.send(method, 2..4).should eql(L[3,4])
list.send(method, 3..0).should eql(L.empty)
list.send(method, 3..3).should eql(L[4])
list.send(method, 3..4).should eql(L[4])
list.send(method, 4..0).should eql(L.empty)
list.send(method, 4..4).should eql(L.empty)
list.send(method, 4..5).should eql(L.empty)
list.send(method, 5..0).should be_nil
list.send(method, 5..5).should be_nil
list.send(method, 5..6).should be_nil
big.send(method, 159..162).should eql(L[160,161,162,163])
big.send(method, 160..162).should eql(L[161,162,163])
big.send(method, 161..162).should eql(L[162,163])
big.send(method, 9999..10100).should eql(L[10000])
big.send(method, 10000..10100).should eql(L.empty)
big.send(method, 10001..10100).should be_nil
list.send(method, 0...-1).should eql(L[1,2,3])
list.send(method, 0...-10).should eql(L.empty)
list.send(method, 0...0).should eql(L.empty)
list.send(method, 0...1).should eql(L[1])
list.send(method, 0...2).should eql(L[1,2])
list.send(method, 0...3).should eql(L[1,2,3])
list.send(method, 0...4).should eql(L[1,2,3,4])
list.send(method, 0...10).should eql(L[1,2,3,4])
list.send(method, 2...-10).should eql(L.empty)
list.send(method, 2...0).should eql(L.empty)
list.send(method, 2...2).should eql(L.empty)
list.send(method, 2...3).should eql(L[3])
list.send(method, 2...4).should eql(L[3,4])
list.send(method, 3...0).should eql(L.empty)
list.send(method, 3...3).should eql(L.empty)
list.send(method, 3...4).should eql(L[4])
list.send(method, 4...0).should eql(L.empty)
list.send(method, 4...4).should eql(L.empty)
list.send(method, 4...5).should eql(L.empty)
list.send(method, 5...0).should be_nil
list.send(method, 5...5).should be_nil
list.send(method, 5...6).should be_nil
big.send(method, 159...162).should eql(L[160,161,162])
big.send(method, 160...162).should eql(L[161,162])
big.send(method, 161...162).should eql(L[162])
big.send(method, 9999...10100).should eql(L[10000])
big.send(method, 10000...10100).should eql(L.empty)
big.send(method, 10001...10100).should be_nil
list.send(method, -1..-1).should eql(L[4])
list.send(method, -1...-1).should eql(L.empty)
list.send(method, -1..3).should eql(L[4])
list.send(method, -1...3).should eql(L.empty)
list.send(method, -1..4).should eql(L[4])
list.send(method, -1...4).should eql(L[4])
list.send(method, -1..10).should eql(L[4])
list.send(method, -1...10).should eql(L[4])
list.send(method, -1..0).should eql(L.empty)
list.send(method, -1..-4).should eql(L.empty)
list.send(method, -1...-4).should eql(L.empty)
list.send(method, -1..-6).should eql(L.empty)
list.send(method, -1...-6).should eql(L.empty)
list.send(method, -2..-2).should eql(L[3])
list.send(method, -2...-2).should eql(L.empty)
list.send(method, -2..-1).should eql(L[3,4])
list.send(method, -2...-1).should eql(L[3])
list.send(method, -2..10).should eql(L[3,4])
list.send(method, -2...10).should eql(L[3,4])
big.send(method, -1..-1).should eql(L[10000])
big.send(method, -1..9999).should eql(L[10000])
big.send(method, -1...9999).should eql(L.empty)
big.send(method, -2...9999).should eql(L[9999])
big.send(method, -2..-1).should eql(L[9999,10000])
list.send(method, -4..-4).should eql(L[1])
list.send(method, -4..-2).should eql(L[1,2,3])
list.send(method, -4...-2).should eql(L[1,2])
list.send(method, -4..-1).should eql(L[1,2,3,4])
list.send(method, -4...-1).should eql(L[1,2,3])
list.send(method, -4..3).should eql(L[1,2,3,4])
list.send(method, -4...3).should eql(L[1,2,3])
list.send(method, -4..4).should eql(L[1,2,3,4])
list.send(method, -4...4).should eql(L[1,2,3,4])
list.send(method, -4..0).should eql(L[1])
list.send(method, -4...0).should eql(L.empty)
list.send(method, -4..1).should eql(L[1,2])
list.send(method, -4...1).should eql(L[1])
list.send(method, -5..-5).should be_nil
list.send(method, -5...-5).should be_nil
list.send(method, -5..-4).should be_nil
list.send(method, -5..-1).should be_nil
list.send(method, -5..10).should be_nil
big.send(method, -10001..-1).should be_nil
end
it 'leaves the original unchanged' do
list.should eql(L[1,2,3,4])
end
end
end
context 'when passed a subclass of Range' do
it 'works the same as with a Range' do
subclass = Class.new(Range)
list.send(method, subclass.new(1,2)).should eql(L[2,3])
list.send(method, subclass.new(-3,-1,true)).should eql(L[2,3])
end
end
end
end
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