76 lines
2.2 KiB
Ruby
76 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/emoji.js
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module Banzai
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module Filter
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# HTML filter that replaces :emoji: and unicode with images.
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#
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# Based on HTML::Pipeline::EmojiFilter
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class EmojiFilter < HTML::Pipeline::Filter
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IGNORED_ANCESTOR_TAGS = %w(pre code tt).to_set
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def call
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doc.xpath('descendant-or-self::text()').each do |node|
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content = node.to_html
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next if has_ancestor?(node, IGNORED_ANCESTOR_TAGS)
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next unless content.include?(':') || node.text.match(emoji_unicode_pattern)
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html = emoji_unicode_element_unicode_filter(content)
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html = emoji_name_element_unicode_filter(html)
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next if html == content
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node.replace(html)
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end
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doc
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end
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# Replace :emoji: with corresponding gl-emoji unicode.
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#
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# text - String text to replace :emoji: in.
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#
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# Returns a String with :emoji: replaced with gl-emoji unicode.
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def emoji_name_element_unicode_filter(text)
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text.gsub(emoji_pattern) do |match|
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name = Regexp.last_match(1)
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emoji = TanukiEmoji.find_by_alpha_code(name)
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Gitlab::Emoji.gl_emoji_tag(emoji)
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end
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end
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# Replace unicode emoji with corresponding gl-emoji unicode.
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#
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# text - String text to replace unicode emoji in.
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#
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# Returns a String with unicode emoji replaced with gl-emoji unicode.
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def emoji_unicode_element_unicode_filter(text)
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text.gsub(emoji_unicode_pattern) do |moji|
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emoji = TanukiEmoji.find_by_codepoints(moji)
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Gitlab::Emoji.gl_emoji_tag(emoji)
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end
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end
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# Build a regexp that matches all valid :emoji: names.
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def self.emoji_pattern
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@emoji_pattern ||= TanukiEmoji.index.alpha_code_pattern
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end
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# Build a regexp that matches all valid unicode emojis names.
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def self.emoji_unicode_pattern
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@emoji_unicode_pattern ||= TanukiEmoji.index.codepoints_pattern
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end
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private
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def emoji_pattern
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self.class.emoji_pattern
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end
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def emoji_unicode_pattern
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self.class.emoji_unicode_pattern
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end
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end
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end
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end
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