Class: Gitlab::Diff::LinesUnfolder

Inherits:
Object
  • Object
show all
Includes:
Utils::StrongMemoize
Defined in:
lib/gitlab/diff/lines_unfolder.rb

Constant Summary collapse

UNFOLD_CONTEXT_SIZE = 
3

Instance Method Summary collapse

Constructor Details

#initialize(diff_file, position) ⇒ LinesUnfolder

Returns a new instance of LinesUnfolder.



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# File 'lib/gitlab/diff/lines_unfolder.rb', line 12

def initialize(diff_file, position)
  @diff_file = diff_file
  @blob = diff_file.old_blob
  @position = position
  @generate_top_match_line = true
  @generate_bottom_match_line = true

  # These methods update `@generate_top_match_line` and
  # `@generate_bottom_match_line`.
  @from_blob_line = calculate_from_blob_line!
  @to_blob_line = calculate_to_blob_line!
end

Instance Method Details

#blob_lines ⇒ Object

Returns the extracted lines from the old blob which should be merged with the current diff lines.



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# File 'lib/gitlab/diff/lines_unfolder.rb', line 37

def blob_lines
  strong_memoize(:blob_lines) do
    # Blob lines, unlike diffs, doesn't start with an empty space for
    # unchanged line, so the parsing and highlighting step can get fuzzy
    # without the following change.
    line_prefix = ' '
    blob_as_diff_lines = @blob.data.each_line.map { |line| "#{line_prefix}#{line}" }

    lines = Gitlab::Diff::Parser.new.parse(blob_as_diff_lines, diff_file: @diff_file).to_a

    from = from_blob_line - 1
    to = to_blob_line - 1

    lines[from..to]
  end
end

#unfold_required? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gitlab/diff/lines_unfolder.rb', line 54

def unfold_required?
  strong_memoize(:unfold_required) do
    next false unless @diff_file.text?
    next false unless @position.unfoldable?
    next false if @diff_file.new_file? || @diff_file.deleted_file?
    next false unless @position.old_line
    next false unless @position.old_line.is_a?(Integer)
    # Invalid position (MR import scenario)
    next false if @position.old_line > @blob.lines.size
    next false if @diff_file.diff_lines.empty?
    next false if @diff_file.line_for_position(@position)
    next false unless unfold_line

    true
  end
end

#unfolded_diff_lines ⇒ Object

Returns merged diff lines with required blob lines with correct positions.



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# File 'lib/gitlab/diff/lines_unfolder.rb', line 27

def unfolded_diff_lines
  strong_memoize(:unfolded_diff_lines) do
    next unless unfold_required?

    merged_diff_with_blob_lines
  end
end