mastodon/app/lib/extractor.rb

# frozen_string_literal: true

module Extractor
  extend Twitter::Extractor

  module_function

  def extract_mentions_or_lists_with_indices(text) # :yields: username, list_slug, start, end
    return [] unless text =~ Twitter::Regex[:at_signs]

    possible_entries = []

    text.to_s.scan(Account::MENTION_RE) do |screen_name, _|
      match_data = $LAST_MATCH_INFO
      after = $'
      unless after =~ Twitter::Regex[:end_mention_match]
        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
end