1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
# frozen_string_literal: true
# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/emoji.js
module Banzai
module Filter
# HTML filter that replaces :emoji: and unicode with images.
#
# Based on HTML::Pipeline::EmojiFilter
class EmojiFilter < HTML::Pipeline::Filter
prepend Concerns::TimeoutFilterHandler
prepend Concerns::PipelineTimingCheck
IGNORED_ANCESTOR_TAGS = %w[pre code tt].to_set
IGNORE_UNICODE_EMOJIS = %w[™ © ®].freeze
def call
@emoji_count = 0
doc.xpath('descendant-or-self::text()[not(ancestor::a[@data-footnote-backref])]').each do |node|
break if Banzai::Filter.filter_item_limit_exceeded?(@emoji_count)
next if has_ancestor?(node, IGNORED_ANCESTOR_TAGS)
content = node.to_html
html = emoji_unicode_element_unicode_filter(content)
html = emoji_name_element_unicode_filter(html) if content.include?(':')
next if html == content
node.replace(html)
end
doc
end
# Replace :emoji: with corresponding gl-emoji unicode.
#
# text - String text to replace :emoji: in.
#
# Returns a String with :emoji: replaced with gl-emoji unicode.
def emoji_name_element_unicode_filter(text)
Gitlab::Utils::Gsub
.gsub_with_limit(text, emoji_pattern, limit: Banzai::Filter::FILTER_ITEM_LIMIT) do |match_data|
emoji = TanukiEmoji.find_by_alpha_code(match_data[0])
process_emoji_tag(emoji, match_data[0])
end
end
# Replace unicode emoji with corresponding gl-emoji unicode.
#
# text - String text to replace unicode emoji in.
#
# Returns a String with unicode emoji replaced with gl-emoji unicode.
def emoji_unicode_element_unicode_filter(text)
Gitlab::Utils::Gsub
.gsub_with_limit(text, emoji_unicode_pattern, limit: Banzai::Filter::FILTER_ITEM_LIMIT) do |match_data|
if ignore_emoji?(match_data[0])
match_data[0]
else
emoji = TanukiEmoji.find_by_codepoints(match_data[0])
process_emoji_tag(emoji, match_data[0])
end
end
end
def process_emoji_tag(emoji, fallback)
return fallback unless emoji
@emoji_count += 1
Gitlab::Emoji.gl_emoji_tag(emoji)
end
def ignore_emoji?(text)
IGNORE_UNICODE_EMOJIS.include?(text)
end
# Build a regexp that matches all valid :emoji: names.
def self.emoji_pattern
@emoji_pattern ||= TanukiEmoji.index.alpha_code_pattern
end
def self.emoji_unicode_pattern
# Use regex from unicode-emoji gem. This is faster than the built-in TanukiEmoji
# regex for large documents.
Unicode::Emoji::REGEX_VALID_INCLUDE_TEXT
end
private
def emoji_pattern
self.class.emoji_pattern
end
def emoji_unicode_pattern
self.class.emoji_unicode_pattern
end
end
end
end
|
