You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hash_separator.rb
    path of file: ./repos/openproject/lib/open_project/text_formatting/matchers/link_handlers
    
    the code of the file until where you have to start completion: #-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2024 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARR
    
      def self.allowed_prefixes
        %w(version message project user group document meeting view)
      end

      ##
      # Hash-separated object links
      # Condition: Separator is '#'
      # Condition: Prefix is present, checked to be one of the allowed values
      def applicable?
        matcher.sep == '#' && valid_prefix? && oid.present?
      end

      # Examples:
      #     document#17 -> Link to document with id 17
      #     version#3 -> Link to version with id 3
      #     message#1218 -> Link to message with id 1218
      #
      def call
        send :"render_#{matcher.prefix}"
      end

      def valid_prefix?
        allowed_prefixes.include?(matcher.prefix)
      end

      private

      def render_version
        version = Version.find_by(id: oid)
        if version
          link_to h(version.name),
                  { only_path: context[:only_path], controller: '/versions', action: 'show', id: version },
                  class: 'version'
        end
      end

      def render_document
        if document = Document.visible.find_by_id(oid)
          link_to document.title,
                  { only_path: context[:only_path],
                    controller: '/documents',
                    action: 'show',
                    id: document },
                  class: 'document'
        end
      end

      def render_meeting
        meeting = Meeting.find_by_id(oid)
        if meeting&.visible?(User.current)
          link_to meeting.title,
                  { only_path: context[:only_path],
                    controller: '/meetings',
                    action: 'show',
                    id: oid },
                  class: 'meeting'
        end
      end

      def render_message
        message = Message.includes(:parent).find_by(id: oid)
        if message
          link_to_message(message, { only_path: context[:only_path] }, class: 'message')
        end
      end

      def render_project
        p = Project.find_by(id: oid)
        if p
          link_to_project(p, { only_path: context[:only_path] }, class: 'project')
        end
      end