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mastodon/app/lib/extractor.rb

120 lines
3.0 KiB

# frozen_string_literal: true
module Extractor
MAX_DOMAIN_LENGTH = 253
extend Twitter::TwitterText::Extractor
module_function
def extract_entities_with_indices(text, options = {}, &block)
entities = begin
extract_urls_with_indices(text, options) +
extract_hashtags_with_indices(text, check_url_overlap: false) +
extract_mentions_or_lists_with_indices(text) +
extract_extra_uris_with_indices(text)
end
return [] if entities.empty?
entities = remove_overlapping_entities(entities)
entities.each(&block) if block_given?
entities
end
def extract_mentions_or_lists_with_indices(text)
return [] unless text && Twitter::TwitterText::Regex[:at_signs].match?(text)
possible_entries = []
text.scan(Account::MENTION_RE) do |screen_name, _|
match_data = $LAST_MATCH_INFO
after = $'
unless Twitter::TwitterText::Regex[:end_mention_match].match?(after)
_, domain = screen_name.split('@')
next if domain.present? && domain.length > MAX_DOMAIN_LENGTH
start_position = match_data.char_begin(1) - 1
end_position = match_data.char_end(1)
possible_entries << {
screen_name: screen_name,
indices: [start_position, end_position],
}
end
end
if block_given?
possible_entries.each do |mention|
yield mention[:screen_name], mention[:indices].first, mention[:indices].last
end
end
possible_entries
end
def extract_hashtags_with_indices(text, _options = {})
return [] unless text&.index('#')
possible_entries = []
text.scan(Tag::HASHTAG_RE) do |hash_text, _|
match_data = $LAST_MATCH_INFO
start_position = match_data.char_begin(1) - 1
end_position = match_data.char_end(1)
after = $'
if %r{\A://}.match?(after)
hash_text.match(/(.+)(https?\Z)/) do |matched|
hash_text = matched[1]
end_position -= matched[2].codepoint_length
end
end
possible_entries << {
hashtag: hash_text,
indices: [start_position, end_position],
}
end
if block_given?
possible_entries.each do |tag|
yield tag[:hashtag], tag[:indices].first, tag[:indices].last
end
end
possible_entries
end
def extract_cashtags_with_indices(_text)
[]
end
def extract_extra_uris_with_indices(text)
return [] unless text&.index(':')
possible_entries = []
text.scan(Twitter::TwitterText::Regex[:valid_extended_uri]) do
valid_uri_match_data = $LAST_MATCH_INFO
start_position = valid_uri_match_data.char_begin(3)
end_position = valid_uri_match_data.char_end(3)
possible_entries << {
url: valid_uri_match_data[3],
indices: [start_position, end_position],
}
end
if block_given?
possible_entries.each do |url|
yield url[:url], url[:indices].first, url[:indices].last
end
end
possible_entries
end
end