spec/ruby/core/matchdata/pre_match_spec.rb


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require_relative '../../spec_helper'

describe "MatchData#pre_match" do
  it "returns the string before the match, equiv. special var $`" do
    /(.)(.)(\d+)(\d)/.match("THX1138: The Movie").pre_match.should == 'T'
    $`.should == 'T'
  end

  it "keeps taint status from the source string" do
    str = "THX1138: The Movie"
    str.taint
    res = /(.)(.)(\d+)(\d)/.match(str).pre_match
    res.tainted?.should be_true
    $`.tainted?.should be_true
  end

  it "keeps untrusted status from the source string" do
    str = "THX1138: The Movie"
    str.untrust
    res = /(.)(.)(\d+)(\d)/.match(str).pre_match
    res.untrusted?.should be_true
    $`.untrusted?.should be_true
  end

  with_feature :encoding do
    it "sets the encoding to the encoding of the source String" do
      str = "abc".force_encoding Encoding::EUC_JP
      str.match(/b/).pre_match.encoding.should equal(Encoding::EUC_JP)
    end

    it "sets an empty result to the encoding of the source String" do
      str = "abc".force_encoding Encoding::ISO_8859_1
      str.match(/a/).pre_match.encoding.should equal(Encoding::ISO_8859_1)
    end
  end
end