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require_relative '../spec_helper'
describe "The redo statement" do
it "restarts block execution if used within block" do
a = []
-> {
a << 1
redo if a.size < 2
a << 2
}.call
a.should == [1, 1, 2]
end
it "re-executes the closest loop" do
exist = [2,3]
processed = []
order = []
[1,2,3,4].each do |x|
order << x
begin
processed << x
if exist.include?(x)
raise StandardError, "included"
end
rescue StandardError
exist.delete(x)
redo
end
end
processed.should == [1,2,2,3,3,4]
exist.should == []
order.should == [1,2,2,3,3,4]
end
it "re-executes the last step in enumeration" do
list = []
[1,2,3].each do |x|
list << x
break if list.size == 6
redo if x == 3
end
list.should == [1,2,3,3,3,3]
end
it "triggers ensure block when re-executing a block" do
list = []
[1,2,3].each do |x|
list << x
begin
list << 10*x
redo if list.count(1) == 1
ensure
list << 100*x
end
end
list.should == [1,10,100,1,10,100,2,20,200,3,30,300]
end
describe "in a method" do
it "is invalid and raises a SyntaxError" do
-> {
eval("def m; redo; end")
}.should raise_error(SyntaxError)
end
end
end
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