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module Gitlab
class InlineDiff
class << self
START = "#!idiff-start!#"
FINISH = "#!idiff-finish!#"
def processing(diff_arr)
indexes = _indexes_of_changed_lines diff_arr
indexes.each do |index|
first_line = diff_arr[index+1]
second_line = diff_arr[index+2]
# Skip inline diff if empty line was replaced with content
next if first_line == "-\n"
first_token = find_first_token(first_line, second_line)
apply_first_token(diff_arr, index, first_token)
last_token = find_last_token(first_line, second_line, first_token)
apply_last_token(diff_arr, index, last_token)
end
diff_arr
end
def apply_first_token(diff_arr, index, first_token)
start = first_token + START
if first_token.empty?
# In case if we remove string of spaces in commit
diff_arr[index+1].sub!("-", "-" => "-#{START}")
diff_arr[index+2].sub!("+", "+" => "+#{START}")
else
diff_arr[index+1].sub!(first_token, first_token => start)
diff_arr[index+2].sub!(first_token, first_token => start)
end
end
def apply_last_token(diff_arr, index, last_token)
# This is tricky: escape backslashes so that `sub` doesn't interpret them
# as backreferences. Regexp.escape does NOT do the right thing.
replace_token = FINISH + last_token.gsub(/\\/, '\&\&')
diff_arr[index+1].sub!(/#{Regexp.escape(last_token)}$/, replace_token)
diff_arr[index+2].sub!(/#{Regexp.escape(last_token)}$/, replace_token)
end
def find_first_token(first_line, second_line)
max_length = [first_line.size, second_line.size].max
first_the_same_symbols = 0
(0..max_length + 1).each do |i|
first_the_same_symbols = i - 1
if first_line[i] != second_line[i] && i > 0
break
end
end
first_line[0..first_the_same_symbols][1..-1]
end
def find_last_token(first_line, second_line, first_token)
max_length = [first_line.size, second_line.size].max
last_the_same_symbols = 0
(1..max_length + 1).each do |i|
last_the_same_symbols = -i
shortest_line = second_line.size > first_line.size ? first_line : second_line
if (first_line[-i] != second_line[-i]) || "#{first_token}#{START}".size == shortest_line[1..-i].size
break
end
end
last_the_same_symbols += 1
first_line[last_the_same_symbols..-1]
end
def _indexes_of_changed_lines(diff_arr)
chain_of_first_symbols = ""
diff_arr.each_with_index do |line, i|
chain_of_first_symbols += line[0]
end
chain_of_first_symbols.gsub!(/[^\-\+]/, "#")
offset = 0
indexes = []
while index = chain_of_first_symbols.index("#-+#", offset)
indexes << index
offset = index + 1
end
indexes
end
def replace_markers(line)
line.gsub!(START, "<span class='idiff'>")
line.gsub!(FINISH, "</span>")
line
end
end
end
end
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