spec/ruby/core/matchdata/match_length_spec.rb


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# -*- encoding: utf-8 -*-

require_relative '../../spec_helper'

describe "MatchData#match_length" do
  it "returns the length of the corresponding match when given an Integer" do
    md = /(.)(.)(\d+)(\d)/.match("THX1138.")

    md.match_length(0).should == 6
    md.match_length(1).should == 1
    md.match_length(2).should == 1
    md.match_length(3).should == 3
    md.match_length(4).should == 1
  end

  it "returns nil on non-matching index matches" do
    md = /\d+(\w)?/.match("THX1138.")
    md.match_length(1).should == nil
  end

  it "returns the length of the corresponding named match when given a Symbol" do
    md = 'haystack'.match(/(?<t>t(?<a>ack))/)
    md.match_length(:a).should == 3
    md.match_length(:t).should == 4
  end

  it "returns nil on non-matching index matches" do
    md = 'haystack'.match(/(?<t>t)(?<a>all)?/)
    md.match_length(:t).should == 1
    md.match_length(:a).should == nil
  end
end