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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
lines = []
skip_next = false
highlighted_diff_lines = diff_file.highlighted_diff_lines
highlighted_diff_lines.each do |line|
full_line = line.text
type = line.type
line_code = generate_line_code(diff_file.file_path, line)
line_new = line.new_pos
line_old = line.old_pos
next_line = diff_file.next_line(line.index)
if next_line
next_line = highlighted_diff_lines[next_line.index]
next_line_code = generate_line_code(diff_file.file_path, next_line)
next_type = next_line.type
next_line = next_line.text
end
case type
when 'match', nil
# line in the right panel is the same as in the left one
lines << {
left: {
type: type,
number: line_old,
text: full_line,
line_code: line_code,
},
right: {
type: type,
number: line_new,
text: full_line,
line_code: line_code
}
}
when 'old'
case next_type
when 'new'
# Left side has text removed, right side has text added
lines << {
left: {
type: type,
number: line_old,
text: full_line,
line_code: line_code,
},
right: {
type: next_type,
number: line_new,
text: next_line,
line_code: next_line_code
}
}
skip_next = true
when 'old', 'nonewline', nil
# Left side has text removed, right side doesn't have any change
# No next line code, no new line number, no new line text
lines << {
left: {
type: type,
number: line_old,
text: full_line,
line_code: line_code,
},
right: {
type: next_type,
number: nil,
text: "",
line_code: nil
}
}
end
when 'new'
if skip_next
# Change has been already included in previous line so no need to do it again
skip_next = false
next
else
# Change is only on the right side, left side has no change
lines << {
left: {
type: nil,
number: nil,
text: "",
line_code: line_code,
},
right: {
type: type,
number: line_new,
text: full_line,
line_code: line_code
}
}
end
end
end
lines
end
private
def generate_line_code(file_path, line)
Gitlab::Diff::LineCode.generate(file_path, line.new_pos, line.old_pos)
end
end
end
end
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