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module Gitlab
module Diff
class ParallelDiff
attr_accessor :diff_file
def initialize(diff_file)
@diff_file = diff_file
end
def parallelize
i = 0
free_right_index = nil
lines = []
highlighted_diff_lines = diff_file.highlighted_diff_lines
highlighted_diff_lines.each do |line|
if line.removed?
lines << {
left: line,
right: nil
}
# Once we come upon a new line it can be put on the right of this old line
free_right_index ||= i
i += 1
elsif line.added?
if free_right_index
# If an old line came before this without a line on the right, this
# line can be put to the right of it.
lines[free_right_index][:right] = line
# If there are any other old lines on the left that don't yet have
# a new counterpart on the right, update the free_right_index
next_free_right_index = free_right_index + 1
free_right_index = next_free_right_index < i ? next_free_right_index : nil
else
lines << {
left: nil,
right: line
}
free_right_index = nil
i += 1
end
elsif line.meta? || line.unchanged?
# line in the right panel is the same as in the left one
lines << {
left: line,
right: line
}
free_right_index = nil
i += 1
end
end
lines
end
end
end
end
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