# File lib/ansi/string.rb, line 139 def sub!(pattern, replacement=nil, &block) mark_changes = [] text = @text.sub(pattern) do |s| index = $~.begin(0) replacement = block.call(s) if block_given? delta = (replacement.size - s.size) mark_changes << [index, delta] replacement end marks = @marks mark_changes.each do |index, delta| marks = shift_marks(index, delta, marks) end @text = text @marks = marks self end