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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/slice'
describe "Array#slice!" do
it "removes and return the element at index" do
a = [1, 2, 3, 4]
a.slice!(10).should == nil
a.should == [1, 2, 3, 4]
a.slice!(-10).should == nil
a.should == [1, 2, 3, 4]
a.slice!(2).should == 3
a.should == [1, 2, 4]
a.slice!(-1).should == 4
a.should == [1, 2]
a.slice!(1).should == 2
a.should == [1]
a.slice!(-1).should == 1
a.should == []
a.slice!(-1).should == nil
a.should == []
a.slice!(0).should == nil
a.should == []
end
it "removes and returns length elements beginning at start" do
a = [1, 2, 3, 4, 5, 6]
a.slice!(2, 3).should == [3, 4, 5]
a.should == [1, 2, 6]
a.slice!(1, 1).should == [2]
a.should == [1, 6]
a.slice!(1, 0).should == []
a.should == [1, 6]
a.slice!(2, 0).should == []
a.should == [1, 6]
a.slice!(0, 4).should == [1, 6]
a.should == []
a.slice!(0, 4).should == []
a.should == []
a = [1]
a.slice!(0, 1).should == [1]
a.should == []
a[-1].should == nil
a = [1, 2, 3]
a.slice!(0,1).should == [1]
a.should == [2, 3]
end
it "returns nil if length is negative" do
a = [1, 2, 3]
a.slice!(2, -1).should == nil
a.should == [1, 2, 3]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.slice(0).should == empty
array = ArraySpecs.recursive_array
array.slice(4).should == array
array.slice(0..3).should == [1, 'two', 3.0, array]
end
it "calls to_int on start and length arguments" do
obj = mock('2')
def obj.to_int() 2 end
a = [1, 2, 3, 4, 5]
a.slice!(obj).should == 3
a.should == [1, 2, 4, 5]
a.slice!(obj, obj).should == [4, 5]
a.should == [1, 2]
a.slice!(0, obj).should == [1, 2]
a.should == []
end
it "removes and return elements in range" do
a = [1, 2, 3, 4, 5, 6, 7, 8]
a.slice!(1..4).should == [2, 3, 4, 5]
a.should == [1, 6, 7, 8]
a.slice!(1...3).should == [6, 7]
a.should == [1, 8]
a.slice!(-1..-1).should == [8]
a.should == [1]
a.slice!(0...0).should == []
a.should == [1]
a.slice!(0..0).should == [1]
a.should == []
a = [1,2,3]
a.slice!(0..3).should == [1,2,3]
a.should == []
end
it "removes and returns elements in end-exclusive ranges" do
a = [1, 2, 3, 4, 5, 6, 7, 8]
a.slice!(4...a.length).should == [5, 6, 7, 8]
a.should == [1, 2, 3, 4]
end
it "calls to_int on range arguments" do
from = mock('from')
to = mock('to')
# So we can construct a range out of them...
def from.<=>(o) 0 end
def to.<=>(o) 0 end
def from.to_int() 1 end
def to.to_int() -2 end
a = [1, 2, 3, 4, 5]
a.slice!(from .. to).should == [2, 3, 4]
a.should == [1, 5]
-> { a.slice!("a" .. "b") }.should raise_error(TypeError)
-> { a.slice!(from .. "b") }.should raise_error(TypeError)
end
it "returns last element for consecutive calls at zero index" do
a = [ 1, 2, 3 ]
a.slice!(0).should == 1
a.slice!(0).should == 2
a.slice!(0).should == 3
a.should == []
end
it "does not expand array with indices out of bounds" do
a = [1, 2]
a.slice!(4).should == nil
a.should == [1, 2]
a.slice!(4, 0).should == nil
a.should == [1, 2]
a.slice!(6, 1).should == nil
a.should == [1, 2]
a.slice!(8...8).should == nil
a.should == [1, 2]
a.slice!(10..10).should == nil
a.should == [1, 2]
end
it "does not expand array with negative indices out of bounds" do
a = [1, 2]
a.slice!(-3, 1).should == nil
a.should == [1, 2]
a.slice!(-3..2).should == nil
a.should == [1, 2]
end
it "raises a FrozenError on a frozen array" do
-> { ArraySpecs.frozen_array.slice!(0, 0) }.should raise_error(FrozenError)
end
it "works with endless ranges" do
a = [1, 2, 3]
a.slice!(eval("(1..)")).should == [2, 3]
a.should == [1]
a = [1, 2, 3]
a.slice!(eval("(2...)")).should == [3]
a.should == [1, 2]
a = [1, 2, 3]
a.slice!(eval("(-2..)")).should == [2, 3]
a.should == [1]
a = [1, 2, 3]
a.slice!(eval("(-1...)")).should == [3]
a.should == [1, 2]
end
ruby_version_is "2.7" do
it "works with beginless ranges" do
a = [0,1,2,3,4]
a.slice!(eval("(..3)")).should == [0, 1, 2, 3]
a.should == [4]
a = [0,1,2,3,4]
a.slice!(eval("(...-2)")).should == [0, 1, 2]
a.should == [3, 4]
end
end
describe "with a subclass of Array" do
before :each do
@array = ArraySpecs::MyArray[1, 2, 3, 4, 5]
end
ruby_version_is ''...'3.0' do
it "returns a subclass instance with [n, m]" do
@array.slice!(0, 2).should be_an_instance_of(ArraySpecs::MyArray)
end
it "returns a subclass instance with [-n, m]" do
@array.slice!(-3, 2).should be_an_instance_of(ArraySpecs::MyArray)
end
it "returns a subclass instance with [n..m]" do
@array.slice!(1..3).should be_an_instance_of(ArraySpecs::MyArray)
end
it "returns a subclass instance with [n...m]" do
@array.slice!(1...3).should be_an_instance_of(ArraySpecs::MyArray)
end
it "returns a subclass instance with [-n..-m]" do
@array.slice!(-3..-1).should be_an_instance_of(ArraySpecs::MyArray)
end
it "returns a subclass instance with [-n...-m]" do
@array.slice!(-3...-1).should be_an_instance_of(ArraySpecs::MyArray)
end
end
ruby_version_is '3.0' do
it "returns a Array instance with [n, m]" do
@array.slice!(0, 2).should be_an_instance_of(Array)
end
it "returns a Array instance with [-n, m]" do
@array.slice!(-3, 2).should be_an_instance_of(Array)
end
it "returns a Array instance with [n..m]" do
@array.slice!(1..3).should be_an_instance_of(Array)
end
it "returns a Array instance with [n...m]" do
@array.slice!(1...3).should be_an_instance_of(Array)
end
it "returns a Array instance with [-n..-m]" do
@array.slice!(-3..-1).should be_an_instance_of(Array)
end
it "returns a Array instance with [-n...-m]" do
@array.slice!(-3...-1).should be_an_instance_of(Array)
end
end
end
end
describe "Array#slice" do
it_behaves_like :array_slice, :slice
end
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