Contents

module TruncateHtml
  class HtmlTruncator

    def initialize(original_html)
      @original_html  = original_html
    end

    def truncate(options = {})
      length        = options[:length]       || TruncateHtml.configuration.length
      @omission     = options[:omission]     || TruncateHtml.configuration.omission
      @word_boundary = (options.has_key?(:word_boundary) ? options[:word_boundary] : TruncateHtml.configuration.word_boundary)
      @chars_remaining = length - @omission.length
      @open_tags, @truncated_html = [], ['']

      @original_html.html_tokens.each do |token|
        #if truncate_more?(token)
        if @chars_remaining > 0
          process_token(token)
        else
          close_open_tags
          break
        end
      end
      @truncated_html.join
    end

    private

      def process_token(token)
        append_to_result(token)
        if token.html_tag?
          if token.open_tag?
            @open_tags << token
          else
            remove_latest_open_tag(token)
          end
        else
          @chars_remaining -= (@word_boundary ? token.length : token[0, @chars_remaining].length)
        end
      end

      def append_to_result(token)
        if @word_boundary
          @truncated_html << token
        else
          @truncated_html << token[0, @chars_remaining]
        end
      end

      def close_open_tags
        @truncated_html[-1] = @truncated_html[-1].rstrip + @omission
        @open_tags.reverse_each do |open_tag|
          @truncated_html << open_tag.matching_close_tag
        end
      end

      def remove_latest_open_tag(close_tag)
        (0...@open_tags.length).to_a.reverse.each do |index|
          if @open_tags[index].matching_close_tag == close_tag
            @open_tags.delete_at(index)
            break
          end
        end
      end

  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
truncate_html-0.5.0	lib/truncate_html/html_truncator.rb
truncate_html-0.4.0	lib/truncate_html/html_truncator.rb
truncate_html-0.3.2	lib/truncate_html/html_truncator.rb
truncate_html-0.3.1	lib/truncate_html/html_truncator.rb