Class: Gitlab::Diff::Parser

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

Instance Method Summary collapse

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gitlab/diff/parser.rb', line 69

def empty?
  @lines.empty?
end

#parse(lines, diff_file: nil) ⇒ Object 



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# File 'lib/gitlab/diff/parser.rb', line 8

def parse(lines, diff_file: nil)
  return [] if lines.blank? || Git::Diff.has_binary_notice?(lines.first)

  @lines = lines
  line_obj_index = 0
  line_old = 1
  line_new = 1
  type = nil
  context = nil

  # 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|
    @lines.each do |line|
      # We're expecting a filename parameter only in a meta-part of the diff content
      # when type is defined then we're already in a content-part
      next if filename?(line) && type.nil?

      full_line = line.delete("\n")

      if /^@@ -/.match?(line)
        type = "match"

        diff_hunk = Gitlab::WordDiff::Segments::DiffHunk.new(line)
        line_old = diff_hunk.pos_old
        line_new = diff_hunk.pos_new

        # not using diff_hunk.first_line? because of defaults
        next if line_old <= 1 && line_new <= 1 # top of file

        yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new, parent_file: diff_file)
        line_obj_index += 1
        next
      elsif line[0] == '\\'
        type = "#{context}-nonewline"

        yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new, parent_file: diff_file)
        line_obj_index += 1
      else
        type = identification_type(line)
        yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new, parent_file: diff_file)
        line_obj_index += 1
      end

      case line[0]
      when "+"
        line_new += 1
        context = :new
      when "-"
        line_old += 1
        context = :old
      when "\\" # rubocop:disable Lint/EmptyWhen
        # No increment
      else
        line_new += 1
        line_old += 1
      end
    end
  end
end