Class: Gitlab::WordDiff::Parser

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/gitlab/word_diff/parser.rb

Instance Method Summary collapse

Instance Method Details

#parse(lines, diff_file: nil) ⇒ Object


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# File 'lib/gitlab/word_diff/parser.rb', line 10

def parse(lines, diff_file: nil)
  return [] if lines.blank?

  # By returning an Enumerator we make it possible to search for a single line (with #find)
  # without having to instantiate all the others that come after it.
  Enumerator.new do |yielder|
    @chunks = ChunkCollection.new
    @counter = PositionsCounter.new

    lines.each do |line|
      segment = LineProcessor.new(line).extract

      case segment
      when Segments::DiffHunk
        next if segment.first_line?

        counter.set_pos_num(old: segment.pos_old, new: segment.pos_new)

        yielder << build_line(segment.to_s, 'match', parent_file: diff_file)

      when Segments::Chunk
        @chunks.add(segment)

      when Segments::Newline
        yielder << build_line(@chunks.content, nil, parent_file: diff_file).tap { |line| line.set_marker_ranges(@chunks.marker_ranges) }

        @chunks.reset
        counter.increase_pos_num
      end
    end
  end
end