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# frozen_string_literal: true
# Converts git diff --word-diff=porcelain output to Gitlab::Diff::Line objects
# see: https://git-scm.com/docs/git-diff#Documentation/git-diff.txt-porcelain
module Gitlab
module WordDiff
class Parser
include Enumerable
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)
@chunks.reset
counter.increase_pos_num
end
end
end
end
private
attr_reader :counter
def build_line(content, type, options = {})
Gitlab::Diff::Line.new(
content, type,
counter.line_obj_index, counter.pos_old, counter.pos_new,
**options).tap do
counter.increase_obj_index
end
end
end
end
end
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