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42 lines
1 KiB
Ruby
42 lines
1 KiB
Ruby
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require File.expand_path('../../../spec_helper', __FILE__)
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require File.expand_path('../shared/extract_range_matched', __FILE__)
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require 'strscan'
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describe "StringScanner#pre_match" 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 "returns the pre-match (in the regular expression sense) of the last scan" do
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@s.pre_match.should == nil
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@s.scan(/\w+\s/)
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@s.pre_match.should == ""
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@s.getch
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@s.pre_match.should == "This "
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@s.get_byte
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@s.pre_match.should == "This i"
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@s.get_byte
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@s.pre_match.should == "This is"
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end
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it "returns nil if there's no match" do
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@s.scan(/\s+/)
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@s.pre_match.should == nil
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end
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it "is more than just the data from the last match" do
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@s.scan(/\w+/)
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@s.scan_until(/a te/)
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@s.pre_match.should == "This is "
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end
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it "is not changed when the scanner's position changes" do
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@s.scan_until(/\s+/)
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@s.pre_match.should == "This"
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@s.pos -= 1
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@s.pre_match.should == "This"
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end
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it_behaves_like :extract_range_matched, :pre_match
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end
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