# frozen_string_literal: true require ‘mail/utilities’ require ‘mail/parser_tools’

begin

original_verbose, $VERBOSE = $VERBOSE, nil

%%{

machine mime_version;
alphtype int;

# Major Digits
action major_digits_s { major_digits_s = p }
action major_digits_e { mime_version.major = chars(data, major_digits_s, p-1) }

# Minor Digits
action minor_digits_s { minor_digits_s = p }
action minor_digits_e { mime_version.minor = chars(data, minor_digits_s, p-1) }

# No-op actions
action comment_s {}
action comment_e {}
action qstr_s {}
action qstr_e {}
action phrase_s {}
action phrase_e {}

include rfc2045_mime "rfc2045_mime.rl";
main := mime_version;

}%%

module Mail::Parsers

module MimeVersionParser
  extend Mail::ParserTools

  MimeVersionStruct = Struct.new(:major, :minor, :error)

  %%write data noprefix;

  def self.parse(data)
    data = data.dup.force_encoding(Encoding::ASCII_8BIT) if data.respond_to?(:force_encoding)

    return MimeVersionStruct.new('', nil) if Mail::Utilities.blank?(data)

    # Parser state
    mime_version = MimeVersionStruct.new
    major_digits_s = minor_digits_s = nil

    # 5.1 Variables Used by Ragel
    p = 0
    eof = pe = data.length
    stack = []

    %%write init;
    %%write exec;

    if p != eof || cs < %%{ write first_final; }%%
      raise Mail::Field::IncompleteParseError.new(Mail::MimeVersionElement, data, p)
    end

    mime_version
  end
end

end

ensure

$VERBOSE = original_verbose

end