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require File.expand_path('../../../spec_helper', __FILE__)
require 'strscan'
describe "StringScanner#unscan" do
before :each do
@s = StringScanner.new("This is a test")
end
it "set the scan pointer to the previous position" do
@s.scan(/This/)
@s.unscan
@s.matched.should == nil
@s.pos.should == 0
end
it "remember only one previous position" do
pos1 = @s.pos
@s.scan(/This/)
pos2 = @s.pos
@s.scan(/ is/)
@s.unscan
@s.pos.should == pos2
end
it "raises a ScanError when the previous match had failed" do
lambda { @s.unscan }.should raise_error(ScanError)
lambda { @s.scan(/\d/); @s.unscan }.should raise_error(ScanError)
end
end
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