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