#--
# gravaty
# Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019  Marco Bresciani
#
# This file is part of gravaty.
#
# gravaty 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 3 of the License, or (at your
# option) any later version.
#
# gravaty is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with gravaty. If not, see <http://www.gnu.org/licenses/>.
#++

module Gravaty
  module Utils
    # This module is a simple wrapper container for Peter R. Marreck's gist.
    #
    # Author:: {Peter R. Marreck}[mailto:lumbergh@gmail.com]
    # Copyright:: Copyleft (©) 2013, Peter R. Marreck
    # License:: This work is released under the BSD 3-Clause License
    # http://choosealicense.com/licenses/bsd-3-clause/
    module Rfc5322

# Author:: {Peter R. Marreck}[mailto:lumbergh@gmail.com]
# Copyright:: Copyleft (©) 2013, Peter R. Marreck
# License:: This work is released under the BSD 3-Clause License
# http://choosealicense.com/licenses/bsd-3-clause/

# RFC 5322 Email Validation Regex in Ruby

# This work is released under the BSD 3-Clause License
# http://choosealicense.com/licenses/bsd-3-clause/
# Copyleft (©) 2013, Peter R. Marreck
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#   Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
#
#   Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
#
#   Neither the name of the {organization} nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

      EMAIL = /
    (?<addr_spec> (?> \g<local_part> @ \g<domain> ) ){0}
    (?<local_part> (?> \g<dot_atom> | \g<quoted_string> | \g<obs_local_part> ) ){0}
    (?<domain> (?> \g<dot_atom> | \g<domain_literal> | \g<obs_domain> ) ){0}
    (?<domain_literal> (?> \g<CFWS>? \[ (?: \g<FWS>? \g<dtext> )* \g<FWS>? \] \g<CFWS>? ) ){0}
    (?<dtext> (?> [\x21-\x5a] | [\x5e-\x7e] | \g<obs_dtext> ) ){0}
    (?<quoted_pair> (?> \\ (?: \g<VCHAR> | \g<WSP> ) | \g<obs_qp> ) ){0}
    (?<dot_atom> (?> \g<CFWS>? \g<dot_atom_text> \g<CFWS>? ) ){0}
    (?<dot_atom_text> (?> \g<atext> (?: \. \g<atext> )* ) ){0}
    (?<atext> (?> [a-zA-Z0-9!\#\$%&'*\+\/\=\?\^_`{\|}~\-]+ ) ){0}
    (?<atom> (?> \g<CFWS>? \g<atext> \g<CFWS>? ) ){0}
    (?<word> (?> \g<atom> | \g<quoted_string> ) ){0}
    (?<quoted_string> (?> \g<CFWS>? " (?: \g<FWS>? \g<qcontent> )* \g<FWS>? " \g<CFWS>? ) ){0}
    (?<qcontent> (?> \g<qtext> | \g<quoted_pair> ) ){0}
    (?<qtext> (?> \x21 | [\x23-\x5b] | [\x5d-\x7e] | \g<obs_qtext> ) ){0}

    # comments and whitespace
    (?<FWS> (?> (?: \g<WSP>* \r\n )? \g<WSP>+ | \g<obs_FWS> ) ){0}
    (?<CFWS> (?> (?: \g<FWS>? \g<comment> )+ \g<FWS>? | \g<FWS> ) ){0}
    (?<comment> (?> \( (?: \g<FWS>? \g<ccontent> )* \g<FWS>? \) ) ){0}
    (?<ccontent> (?>\g<ctext> | \g<quoted_pair> | \g<comment> ) ){0}
    (?<ctext> (?> [\x21-\x27] | [\x2a-\x5b] | [\x5d-\x7e] | \g<obs_ctext> ) ){0}

    # obsolete tokens
    (?<obs_domain> (?> \g<atom> (?: \. \g<atom> )* ) ){0}
    (?<obs_local_part> (?> \g<word> (?: \. \g<word> )* ) ){0}
    (?<obs_dtext> (?> \g<obs_NO_WS_CTL> | \g<quoted_pair> ) ){0}
    (?<obs_qp> (?> \\ (?: \x00 | \g<obs_NO_WS_CTL> | \n | \r ) ) ){0}
    (?<obs_FWS> (?> \g<WSP>+ (?: \r\n \g<WSP>+ )* ) ){0}
    (?<obs_ctext> (?> \g<obs_NO_WS_CTL> ) ){0}
    (?<obs_qtext> (?> \g<obs_NO_WS_CTL> ) ){0}
    (?<obs_NO_WS_CTL> (?> [\x01-\x08] | \x0b | \x0c | [\x0e-\x1f] | \x7f ) ){0}

    # character class definitions
    (?<VCHAR> (?> [\x21-\x7E] ) ){0}
    (?<WSP> [ \t] ){0}
  \g<addr_spec>
/uix
    end
  end
end