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# frozen_string_literal: true
class EmojiFormatter
include RoutingHelper
DISALLOWED_BOUNDING_REGEX = /[[:alnum:]:]/.freeze
attr_reader :html, :custom_emojis, :options
# @param [ActiveSupport::SafeBuffer] html
# @param [Array<CustomEmoji>] custom_emojis
# @param [Hash] options
# @option options [Boolean] :animate
# @option options [String] :style
def initialize(html, custom_emojis, options = {})
raise ArgumentError unless html.html_safe?
@html = html
@custom_emojis = custom_emojis
@options = options
end
def to_s
return html if custom_emojis.empty? || html.blank?
i = -1
tag_open_index = nil
inside_shortname = false
shortname_start_index = -1
invisible_depth = 0
last_index = 0
result = ''.dup
while i + 1 < html.size
i += 1
if invisible_depth.zero? && inside_shortname && html[i] == ':'
inside_shortname = false
shortcode = html[shortname_start_index + 1..i - 1]
char_after = html[i + 1]
next unless (char_after.nil? || !DISALLOWED_BOUNDING_REGEX.match?(char_after)) && (emoji = emoji_map[shortcode])
result << html[last_index..shortname_start_index - 1] if shortname_start_index.positive?
result << image_for_emoji(shortcode, emoji)
last_index = i + 1
elsif tag_open_index && html[i] == '>'
tag = html[tag_open_index..i]
tag_open_index = nil
if invisible_depth.positive?
invisible_depth += count_tag_nesting(tag)
elsif tag == '<span class="invisible">'
invisible_depth = 1
end
elsif html[i] == '<'
tag_open_index = i
inside_shortname = false
elsif !tag_open_index && html[i] == ':' && (i.zero? || !DISALLOWED_BOUNDING_REGEX.match?(html[i - 1]))
inside_shortname = true
shortname_start_index = i
end
end
result << html[last_index..-1]
result.html_safe # rubocop:disable Rails/OutputSafety
end
private
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
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