spec/ruby/core/regexp/linear_time_spec.rb


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require_relative '../../spec_helper'

ruby_version_is "3.2" do
  describe "Regexp.linear_time?" do
    it "returns true if matching can be done in linear time" do
      Regexp.linear_time?(/a/).should == true
      Regexp.linear_time?('a').should == true
    end

    it "return false if matching can't be done in linear time" do
      Regexp.linear_time?(/(a)\1/).should == false
      Regexp.linear_time?("(a)\\1").should == false
    end

    it "accepts flags for string argument" do
      Regexp.linear_time?('a', Regexp::IGNORECASE).should == true
    end

    it "warns about flags being ignored for regexp arguments" do
      -> {
        Regexp.linear_time?(/a/, Regexp::IGNORECASE)
      }.should complain(/warning: flags ignored/)
    end
  end
end