# frozen_string_literal: true module Banzai module Filter class BlockquoteFenceFilter < HTML::Pipeline::TextFilter REGEX = %r{ #{::Gitlab::Regex.markdown_code_or_html_blocks} | (?=(?<=^\n|\A)>>>\ *\n.*\n>>>\ *(?=\n$|\z))(?: # Blockquote: # >>> # Anything, including code and HTML blocks # >>> (?<=^\n|\A)>>>\ *\n (? (?: # Any character that doesn't introduce a code or HTML block (?! ^``` | ^<[^>]+?>\ *\n ) . | # A code block \g


                |
                  # An HTML block
                  \g
              )+?
            )
            \n>>>\ *(?=\n$|\z)
          )
      }mx.freeze

      def initialize(text, context = nil, result = nil)
        super text, context, result
        @text = @text.delete("\r")
      end

      def call
        @text.gsub(REGEX) do
          if $~[:quote]
            # keep the same number of source lines/positions by replacing the
            # fence lines with newlines
            "\n" + $~[:quote].gsub(/^/, "> ").gsub(/^> $/, ">") + "\n"
          else
            $~[0]
          end
        end
      end
    end
  end
end