forked from treehouse/mastodon
107 lines
3.0 KiB
Ruby
107 lines
3.0 KiB
Ruby
# 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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tree = Nokogiri::HTML.fragment(html)
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tree.xpath('./text()|.//text()[not(ancestor[@class="invisible"])]').to_a.each do |node|
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i = -1
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inside_shortname = false
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shortname_start_index = -1
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last_index = 0
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text = node.content
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result = Nokogiri::XML::NodeSet.new(tree.document)
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while i + 1 < text.size
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i += 1
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if inside_shortname && text[i] == ':'
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inside_shortname = false
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shortcode = text[shortname_start_index + 1..i - 1]
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char_after = text[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 << Nokogiri::XML::Text.new(text[last_index..shortname_start_index - 1], tree.document) if shortname_start_index.positive?
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result << Nokogiri::HTML.fragment(image_for_emoji(shortcode, emoji))
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last_index = i + 1
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elsif text[i] == ':' && (i.zero? || !DISALLOWED_BOUNDING_REGEX.match?(text[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 << Nokogiri::XML::Text.new(text[last_index..-1], tree.document)
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node.replace(result)
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end
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tree.to_html.html_safe # rubocop:disable Rails/OutputSafety
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end
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private
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def emoji_map
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@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))] }
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end
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def count_tag_nesting(tag)
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if tag[1] == '/'
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-1
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elsif tag[-2] == '/'
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0
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else
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1
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end
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end
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def image_for_emoji(shortcode, emoji)
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original_url, static_url = emoji
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image_tag(
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animate? ? original_url : static_url,
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image_attributes.merge(alt: ":#{shortcode}:", title: ":#{shortcode}:", data: image_data_attributes(original_url, static_url))
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)
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end
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def image_attributes
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{ rel: 'emoji', draggable: false, width: 16, height: 16, class: image_class_names, style: image_style }
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end
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def image_data_attributes(original_url, static_url)
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{ original: original_url, static: static_url } unless animate?
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end
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def image_class_names
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animate? ? 'emojione' : 'emojione custom-emoji'
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end
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def image_style
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@options[:style]
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end
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def animate?
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@options[:animate] || @options.key?(:style)
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end
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end
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