89 lines
2.5 KiB
Ruby
89 lines
2.5 KiB
Ruby
module Gitlab
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module Diff
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class Parser
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include Enumerable
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def parse(lines)
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return [] if lines.blank?
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@lines = lines
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line_obj_index = 0
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line_old = 1
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line_new = 1
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type = nil
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context = nil
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# By returning an Enumerator we make it possible to search for a single line (with #find)
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# without having to instantiate all the others that come after it.
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Enumerator.new do |yielder|
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@lines.each do |line|
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# We're expecting a filename parameter only in a meta-part of the diff content
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# when type is defined then we're already in a content-part
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next if filename?(line) && type.nil?
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full_line = line.delete("\n")
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if line =~ /^@@ -/
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type = "match"
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line_old = line.match(/\-[0-9]*/)[0].to_i.abs rescue 0
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line_new = line.match(/\+[0-9]*/)[0].to_i.abs rescue 0
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next if line_old <= 1 && line_new <= 1 # top of file
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yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
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line_obj_index += 1
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next
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elsif line[0] == '\\'
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type = "#{context}-nonewline"
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yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
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line_obj_index += 1
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else
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type = identification_type(line)
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yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
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line_obj_index += 1
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end
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case line[0]
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when "+"
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line_new += 1
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context = :new
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when "-"
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line_old += 1
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context = :old
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when "\\" # rubocop:disable Lint/EmptyWhen
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# No increment
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else
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line_new += 1
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line_old += 1
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end
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end
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end
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end
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def empty?
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@lines.empty?
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end
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private
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def filename?(line)
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line.start_with?( '--- /dev/null', '+++ /dev/null', '--- a', '+++ b',
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'+++ a', # The line will start with `+++ a` in the reverse diff of an orphan commit
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'--- /tmp/diffy', '+++ /tmp/diffy')
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end
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def identification_type(line)
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case line[0]
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when "+"
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"new"
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when "-"
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"old"
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else
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nil
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end
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end
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end
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end
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end
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