email.rl

%%{
  machine rfc2822_header;

  action mark {
    @pos = p
  }

  action domain {
    # We have to match 'foo . bar' per the tests and transform it into 'foo.bar'
    @parts[:host] = data[@pos..p-1].delete(" ")
  }

  action local {
    @parts[:local] = data[@pos..p-1]
  }

  action name {
    # Enclosing quotes are stripped to make the tests pass.
    @parts[:name] = data[@pos..p-1].gsub(/^"|"$/, "")
  }

  # Common ABNF rules
  cr                      = "\r";
  lf                      = "\n";
  crlf                    = cr lf;
  sp                      = " ";
  tab                     = "\t";
  wsp                     = (sp | tab);
  obs_fws                 = wsp+ ( crlf wsp+ )*;
  fws                     = ( ( wsp* crlf )? wsp+ ) | obs_fws;
  NO_WS_CTL               = 0x01..0x08 | "\v" | "\f" | 0x0e..0x1f | 0x7f;

  # Rules to consume comments
  consumeAny              = any - (")" | ")") | "(" @{fcall consumeComments;};
  consumeComments        := consumeAny+ ")" $!{fhold; fret; };
  startComment            = "(" @{fcall consumeComments;};
  CFWS                    = ( fws? startComment )* ( ( fws? startComment ) | fws);

  ctext                   = NO_WS_CTL | 0x21..0x27 | 0x2a..0x5b;
  obs_char                = 0x00..0x09 | "\v" | "\f" | 0x0e..0x7f;
  obs_text                = "\n"* "\r"* ( obs_char "\n"* "\r"* )*;
  text                    = 0x01..0x09 | "\v" | "\f" | 0x0e..0x7f; # | obs_text; # obs_causes parser ambiguity; track down why.
  obs_qp                  = "\\" 0x00..0x7f;
  quoted_pair             = ( "\\" text ) | obs_qp;
  dtext                   = NO_WS_CTL | 0x21..0x5a | 0x5E..0x7E;
  dcontent                = dtext | quoted_pair;

  atext                   = alpha | digit | "!" | "#" | "$" | "%" | "&" | "'" | "*" | "+" | "-" | "/" | "=" | "?" | "^" | "_" | "`" | "{" | "|" | "}" | "~";
  dot_atom_text           = atext+ ( "."* atext+ )* "."*;
  dot_atom                = CFWS? dot_atom_text CFWS?;
  qtext                   = NO_WS_CTL | "!" | 0x23..0x5b | 0x5d..0x7e;
  qcontent                = qtext | quoted_pair;
  quoted_string           = "\"" ( fws? qcontent )* fws? "\"";
  atom                    = atext+;
  word                    = atom | quoted_string;
  obs_phrase              = word (word | "." | CFWS)+;
  phrase                  = word+ | obs_phrase;

  obs_domain              = atom ( "." atom )*;
  domain_literal          = CFWS? "[" (fws? dcontent) fws? "]" CFWS?;
  domain                  = dot_atom ("."? dot_atom)* | domain_literal | obs_domain;
  obs_local_part          = word ( "." word )*;
  obs_domain_list         = "@" domain ((CFWS | "," )* CFWS? "@" domain)*;
  obs_route               = CFWS? obs_domain_list ":" CFWS?;

  # I modified display_name here from `phrase` to account for unquoted names with commas.
  display_name            = word (CFWS? (word | ","))*;
  local_part              = dot_atom | quoted_string | obs_local_part;
  addr_spec               = (local_part >mark %local) "@" (domain >mark %domain);
  obs_angle_addr          = CFWS? "<" obs_route? addr_spec ">" CFWS?;
  angle_addr              = CFWS? "<" addr_spec ">" CFWS? | obs_angle_addr;
  name_addr               = (display_name >mark %name) angle_addr;
  mailbox                 = name_addr | addr_spec;
  obs_mbox_list           = (mailbox? CFWS? "," CFWS?)+ mailbox?;
  mailbox_list            = mailbox ("," mailbox)* | obs_mbox_list;
  group                   = display_name ":" (mailbox_list | CFWS)? ";" CFWS?;
  address                 = mailbox | group;
  obs_addr_list           = (address? CFWS? "," CFWS?)+ address?;
  address_list            = address ("," address)* | obs_addr_list;

  main                   := address_list;
}%%


def process_host(host)
  host.gsub(' ','')
end

def parse(email)
  @parts = {}
  @pos = []
  data = email
  eof = data.length
  %%write data;
  %%write init;
  %%write exec;
  @parts
end

require 'minitest/spec'
require 'minitest/autorun'

describe "mail parsing" do
  it "can parse a basic email address" do
    address = parse("[email protected]")
    address[:local].must_equal "ryan"
    address[:host].must_equal "example.com"
  end

  it "can parse a named address" do
    address = parse("Ryan Bigg <[email protected]>")
    address[:name].must_equal "Ryan Bigg"
    address[:local].must_equal "ryan"
    address[:host].must_equal "example.com"
  end

  # Stolen from Mail
  it "should support |Minero Aoki<[email protected]>|" do
    address = parse("Minero Aoki<[email protected]>")
    address[:name].must_equal "Minero Aoki"
    address[:local].must_equal "aamine"
    address[:host].must_equal "0246.loveruby.net"
  end

  # Stolen from Mail
  it "should support lots of dots" do
    1.upto(10) do |times|
      dots    = "." * times
      address = parse("hoge#{dots}[email protected]")
      address[:local].must_equal "hoge#{dots}test"
      address[:host].must_equal "docomo.ne.jp"
    end
  end

  # Stolen from Mail
  it "should handle trailing dots" do
    1.upto(10) do |times|
      dots    = "." * times
      address = parse("hoge#{dots}@docomo.ne.jp")
      address[:local].must_equal "hoge#{dots}"
      address[:host].must_equal "docomo.ne.jp"
    end
  end

  # Stolen from Mail (which actually stole it from a Perl test suite)
  it 'should handle "Joe & J. Harvey" <ddd @Org>' do
    address = parse('"Joe & J. Harvey" <ddd @Org>')
    address[:name].must_equal "Joe & J. Harvey"
    address[:local].must_equal "ddd "
    address[:host].must_equal "Org"
  end

  it "should handle jrh%[email protected]" do
    address = parse('jrh%[email protected]')
    address[:local].must_equal "jrh%cup.portal.com"
    address[:host].must_equal "portal.unix.portal.com"
  end

  it "should handle David Apfelbaum <[email protected]>" do
    address = parse("David Apfelbaum <[email protected]>'")
    address[:name].must_equal "David Apfelbaum"
    address[:local].must_equal "da0g+"
    address[:host].must_equal "andrew.cmu.edu"
  end

  it "should handle Stephen Burke, Liverpool <[email protected]>" do
    address = parse("Stephen Burke, Liverpool <[email protected]>")
    address[:name].must_equal "Stephen Burke, Liverpool"
    address[:local].must_equal "BURKE"
    address[:host].must_equal "vxdsya.desy.de"
  end

  it "should handle jdoe@test   . example" do
    address = parse("jdoe@test   . example")
    address[:local].must_equal "jdoe"
    address[:host].must_equal "test.example"
  end

  it "should handle /G=Owen/S=Smith/O=SJ-Research/ADMD=INTERSPAN/C=GB/@mhs-relay.ac.uk" do
    address = parse("/G=Owen/S=Smith/O=SJ-Research/ADMD=INTERSPAN/C=GB/@mhs-relay.ac.uk")
    address[:local].must_equal "/G=Owen/S=Smith/O=SJ-Research/ADMD=INTERSPAN/C=GB/"
    address[:host].must_equal "mhs-relay.ac.uk"
  end

  it "should handle The Newcastle Info-Server <[email protected]>" do
    address = parse("The Newcastle Info-Server <[email protected]>")
    address[:name].must_equal "The Newcastle Info-Server"
    address[:local].must_equal "info-admin"
    address[:host].must_equal "newcastle.ac.uk"
  end

  it "should handle JAMES R. TWINE - THE NERD <TWINE57%SDELVB%[email protected]>" do
    address = parse(%Q{"JAMES R. TWINE - THE NERD" <TWINE57%SDELVB%[email protected]>})
    address[:name].must_equal "JAMES R. TWINE - THE NERD"
    address[:local].must_equal "TWINE57%SDELVB%SNYDELVA.bitnet"
    address[:host].must_equal "CUNYVM.CUNY.EDU"
  end
end