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module Validation
module Rule
# Email rule class. This rule was adapted from https://github.com/emmanuel/aequitas/blob/master/lib/aequitas/rule/format/email_address.rb
class Email
EMAIL_ADDRESS = begin
letter = 'a-zA-Z'
digit = '0-9'
atext = "[#{letter}#{digit}\!\#\$\%\&\'\*+\/\=\?\^\_\`\{\|\}\~\-]"
dot_atom_text = "#{atext}+([.]#{atext}*)+"
dot_atom = dot_atom_text
no_ws_ctl = '\x01-\x08\x11\x12\x14-\x1f\x7f'
qtext = "[^#{no_ws_ctl}\\x0d\\x22\\x5c]" # Non-whitespace, non-control character except for \ and "
text = '[\x01-\x09\x11\x12\x14-\x7f]'
quoted_pair = "(\\x5c#{text})"
qcontent = "(?:#{qtext}|#{quoted_pair})"
quoted_string = "[\"]#{qcontent}+[\"]"
atom = "#{atext}+"
word = "(?:#{atom}|#{quoted_string})"
obs_local_part = "#{word}([.]#{word})*"
local_part = "(?:#{dot_atom}|#{quoted_string}|#{obs_local_part})"
dtext = "[#{no_ws_ctl}\\x21-\\x5a\\x5e-\\x7e]"
dcontent = "(?:#{dtext}|#{quoted_pair})"
domain_literal = "\\[#{dcontent}+\\]"
obs_domain = "#{atom}([.]#{atom})+"
domain = "(?:#{dot_atom}|#{domain_literal}|#{obs_domain})"
addr_spec = "#{local_part}\@#{domain}"
pattern = /\A#{addr_spec}\z/u
end
# Determines if value is a valid email
def valid_value?(value)
!!EMAIL_ADDRESS.match(value)
end
# The error key for this rule
def error_key
:email
end
# This rule has no params
def params
{}
end
end
end
end
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