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emoji_formatter.rb 3.03 KiB
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# frozen_string_literal: true
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class EmojiFormatter
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  include RoutingHelper
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  DISALLOWED_BOUNDING_REGEX = /[[:alnum:]:]/.freeze
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  attr_reader :html, :custom_emojis, :options
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  # @param [ActiveSupport::SafeBuffer] html
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  # @param [Array<CustomEmoji>] custom_emojis
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  # @param [Hash] options
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  # @option options [Boolean] :animate
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  # @option options [String] :style
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  def initialize(html, custom_emojis, options = {})
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    raise ArgumentError unless html.html_safe?
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    @html = html
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    @custom_emojis = custom_emojis
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    @options = options
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  end
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  def to_s
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    return html if custom_emojis.empty? || html.blank?
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    i                     = -1
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    tag_open_index        = nil
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    inside_shortname      = false
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    shortname_start_index = -1
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    invisible_depth       = 0
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    last_index            = 0
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    result                = ''.dup
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    while i + 1 < html.size
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      i += 1
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      if invisible_depth.zero? && inside_shortname && html[i] == ':'
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        inside_shortname = false
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        shortcode = html[shortname_start_index + 1..i - 1]
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        char_after = html[i + 1]
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        next unless (char_after.nil? || !DISALLOWED_BOUNDING_REGEX.match?(char_after)) && (emoji = emoji_map[shortcode])
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        result << html[last_index..shortname_start_index - 1] if shortname_start_index.positive?
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        result << image_for_emoji(shortcode, emoji)
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        last_index = i + 1
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      elsif tag_open_index && html[i] == '>'
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        tag = html[tag_open_index..i]
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        tag_open_index = nil
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        if invisible_depth.positive?
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          invisible_depth += count_tag_nesting(tag)
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        elsif tag == '<span class="invisible">'
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          invisible_depth = 1
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        end
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      elsif html[i] == '<'
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        tag_open_index = i
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        inside_shortname = false
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      elsif !tag_open_index && html[i] == ':' && (i.zero? || !DISALLOWED_BOUNDING_REGEX.match?(html[i - 1]))
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        inside_shortname = true
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        shortname_start_index = i
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      end
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    end
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    result << html[last_index..]
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    result.html_safe # rubocop:disable Rails/OutputSafety
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  end
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  private
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def emoji_map @emoji_map ||= custom_emojis.each_with_object({}) { |e, h| h[e.shortcode] = [full_asset_url(e.image.url), full_asset_url(e.image.url(:static))] } end def count_tag_nesting(tag) if tag[1] == '/' -1 elsif tag[-2] == '/' 0 else 1 end end def image_for_emoji(shortcode, emoji) original_url, static_url = emoji image_tag( animate? ? original_url : static_url, image_attributes.merge(alt: ":#{shortcode}:", title: ":#{shortcode}:", data: image_data_attributes(original_url, static_url)) ) end def image_attributes { rel: 'emoji', draggable: false, width: 16, height: 16, class: image_class_names, style: image_style } end def image_data_attributes(original_url, static_url) { original: original_url, static: static_url } unless animate? end def image_class_names animate? ? 'emojione' : 'emojione custom-emoji' end def image_style @options[:style] end def animate? @options[:animate] || @options.key?(:style) end end