class Gitlab::InlineDiff

# File lib/gitlab/inline_diff.rb, line 42
def _indexes_of_changed_lines diff_arr
  chain_of_first_symbols = ""
  diff_arr.each_with_index do |line, i|
    chain_of_first_symbols += line[0]
  end
  chain_of_first_symbols.gsub!(%r[^\-\+]/, "#")

  offset = 0
  indexes = []
  while index = chain_of_first_symbols.index("#-+#", offset)
    indexes << index
    offset = index + 1
  end
  indexes
end

# File lib/gitlab/inline_diff.rb, line 8
def processing diff_arr
  indexes = _indexes_of_changed_lines diff_arr

  indexes.each do |index|
    first_line = diff_arr[index+1]
    second_line = diff_arr[index+2]
    max_length = [first_line.size, second_line.size].max

    first_the_same_symbols = 0
    (0..max_length + 1).each do |i|
      first_the_same_symbols = i - 1
      if first_line[i] != second_line[i] && i > 0
        break
      end
    end
    first_token = first_line[0..first_the_same_symbols][1..-1]
    diff_arr[index+1].sub!(first_token, first_token + START)
    diff_arr[index+2].sub!(first_token, first_token + START)
    last_the_same_symbols = 0
    (1..max_length + 1).each do |i|
      last_the_same_symbols = -i
      shortest_line = second_line.size > first_line.size ? first_line : second_line
      if ( first_line[-i] != second_line[-i] ) || "#{first_token}#{START}".size == shortest_line[1..-i].size
        break
      end
    end
    last_the_same_symbols += 1
    last_token = first_line[last_the_same_symbols..-1]
    diff_arr[index+1].sub!(%r#{Regexp.escape(last_token)}$/, FINISH + last_token)
    diff_arr[index+2].sub!(%r#{Regexp.escape(last_token)}$/, FINISH + last_token)
  end
  diff_arr
end

# File lib/gitlab/inline_diff.rb, line 58
def replace_markers line
  line.gsub!(START, "<span class='idiff'>")
  line.gsub!(FINISH, "</span>")
  line
end