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28 lines
649 B
Ruby
28 lines
649 B
Ruby
require_relative '../../spec_helper'
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require 'strscan'
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describe "StringScanner#unscan" do
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before :each do
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@s = StringScanner.new("This is a test")
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end
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it "set the scan pointer to the previous position" do
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@s.scan(/This/)
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@s.unscan
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@s.matched.should == nil
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@s.pos.should == 0
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end
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it "remember only one previous position" do
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@s.scan(/This/)
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pos = @s.pos
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@s.scan(/ is/)
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@s.unscan
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@s.pos.should == pos
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end
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it "raises a ScanError when the previous match had failed" do
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-> { @s.unscan }.should raise_error(ScanError)
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-> { @s.scan(/\d/); @s.unscan }.should raise_error(ScanError)
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end
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end
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