hit_highlight

in rb/lib/twitter-text/hit_highlighter.rb [20:89]

• 57 lines of code
• 15 McCabe index (conditional complexity)

      def hit_highlight(text, hits = [], options = {})
        if hits.empty?
          return text
        end

        tag_name = options[:tag] || DEFAULT_HIGHLIGHT_TAG
        tags = ["<" + tag_name + ">", "</" + tag_name + ">"]

        chunks = text.split(/[<>]/)

        result = []
        chunk_index, chunk = 0, chunks[0]
        chunk_chars = chunk.to_s.to_codepoint_a
        prev_chunks_len = 0
        chunk_cursor = 0
        start_in_chunk = false
        for hit, index in hits.flatten.each_with_index do
          tag = tags[index % 2]

          placed = false
          until chunk.nil? || hit < prev_chunks_len + chunk.length do
            result << chunk_chars[chunk_cursor..-1]
            if start_in_chunk && hit == prev_chunks_len + chunk_chars.length
              result << tag
              placed = true
            end

            
            if tag_text = chunks[chunk_index+1]
              result << "<#{tag_text}>"
            end

            prev_chunks_len += chunk_chars.length
            chunk_cursor = 0
            chunk_index += 2
            chunk = chunks[chunk_index]
            chunk_chars = chunk.to_s.to_codepoint_a
            start_in_chunk = false
          end

          if !placed && !chunk.nil?
            hit_spot = hit - prev_chunks_len
            result << chunk_chars[chunk_cursor...hit_spot] << tag
            chunk_cursor = hit_spot
            if index % 2 == 0
              start_in_chunk = true
            else
              start_in_chunk = false
            end
            placed = true
          end

          
          if !placed
            result << tag
          end
        end

        if chunk
          if chunk_cursor < chunk_chars.length
            result << chunk_chars[chunk_cursor..-1]
          end
          (chunk_index+1).upto(chunks.length-1).each do |i|
            result << (i.even? ? chunks[i] : "<#{chunks[i]}>")
          end
        end

        result.flatten.join
      end