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

begin

original_verbose, $VERBOSE = $VERBOSE, nil

%%{

# RFC 2557 Content-Location
# https://tools.ietf.org/html/rfc2557#section-4.1
machine content_location;
alphtype int;

# Quoted String
action qstr_s { qstr_s = p }
action qstr_e { content_location.location = chars(data, qstr_s, p-1) }

# Token String
action token_string_s { token_string_s = p }
action token_string_e { content_location.location = chars(data, token_string_s, p-1) }

# No-op actions
action comment_e { }
action comment_s { }
action phrase_e { }
action phrase_s { }
action main_type_e { }
action main_type_s { }
action sub_type_e { }
action sub_type_s { }
action param_attr_e { }
action param_attr_s { }
action param_val_e { }
action param_val_s { }

include rfc2045_content_type "rfc2045_content_type.rl";

location = quoted_string | ((token | 0x3d)+ >token_string_s %token_string_e);
main := CFWS? location CFWS?;

}%%

module Mail::Parsers

module ContentLocationParser
  extend Mail::ParserTools

  ContentLocationStruct = Struct.new(:location, :error)

  %%write data noprefix;

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

    content_location = ContentLocationStruct.new(nil)
    return content_location if Mail::Utilities.blank?(data)

    # Parser state
    disp_type_s = param_attr_s = param_attr = qstr_s = qstr = param_val_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::ContentLocationElement, data, p)
    end

    content_location
  end
end

end

ensure

$VERBOSE = original_verbose

end