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module Gitlab
module Diff
class Parser
include Enumerable
def parse(lines)
return [] if lines.blank?
@lines = lines
line_obj_index = 0
line_old = 1
line_new = 1
type = nil
context = nil
# 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|
@lines.each do |line|
next if filename?(line)
full_line = line.delete("\n")
if line =~ /^@@ -/
type = "match"
line_old = line.match(/\-[0-9]*/)[0].to_i.abs rescue 0
line_new = line.match(/\+[0-9]*/)[0].to_i.abs rescue 0
next if line_old <= 1 && line_new <= 1 # top of file
yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
line_obj_index += 1
next
elsif line[0] == '\\'
type = "#{context}-nonewline"
yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
line_obj_index += 1
else
type = identification_type(line)
yielder << Gitlab::Diff::Line.new(full_line, type, line_obj_index, line_old, line_new)
line_obj_index += 1
end
case line[0]
when "+"
line_new += 1
context = :new
when "-"
line_old += 1
context = :old
when "\\" # rubocop:disable Lint/EmptyWhen
# No increment
else
line_new += 1
line_old += 1
end
end
end
end
def empty?
@lines.empty?
end
private
def filename?(line)
line.start_with?( '--- /dev/null', '+++ /dev/null', '--- a', '+++ b',
'+++ a', # The line will start with `+++ a` in the reverse diff of an orphan commit
'--- /tmp/diffy', '+++ /tmp/diffy')
end
def identification_type(line)
case line[0]
when "+"
"new"
when "-"
"old"
else
nil
end
end
end
end
end
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