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|
# frozen_string_literal: true
module Net
class IMAP < Protocol
class ResponseParser # :nodoc:
def initialize
@str = nil
@pos = nil
@lex_state = nil
@token = nil
@flag_symbols = {}
end
def parse(str)
@str = str
@pos = 0
@lex_state = EXPR_BEG
@token = nil
return response
end
private
EXPR_BEG = :EXPR_BEG
EXPR_DATA = :EXPR_DATA
EXPR_TEXT = :EXPR_TEXT
EXPR_RTEXT = :EXPR_RTEXT
EXPR_CTEXT = :EXPR_CTEXT
T_SPACE = :SPACE
T_NIL = :NIL
T_NUMBER = :NUMBER
T_ATOM = :ATOM
T_QUOTED = :QUOTED
T_LPAR = :LPAR
T_RPAR = :RPAR
T_BSLASH = :BSLASH
T_STAR = :STAR
T_LBRA = :LBRA
T_RBRA = :RBRA
T_LITERAL = :LITERAL
T_PLUS = :PLUS
T_PERCENT = :PERCENT
T_CRLF = :CRLF
T_EOF = :EOF
T_TEXT = :TEXT
BEG_REGEXP = /\G(?:\
(?# 1: SPACE )( +)|\
(?# 2: NIL )(NIL)(?=[\x80-\xff(){ \x00-\x1f\x7f%*"\\\[\]+])|\
(?# 3: NUMBER )(\d+)(?=[\x80-\xff(){ \x00-\x1f\x7f%*"\\\[\]+])|\
(?# 4: ATOM )([^\x80-\xff(){ \x00-\x1f\x7f%*"\\\[\]+]+)|\
(?# 5: QUOTED )"((?:[^\x00\r\n"\\]|\\["\\])*)"|\
(?# 6: LPAR )(\()|\
(?# 7: RPAR )(\))|\
(?# 8: BSLASH )(\\)|\
(?# 9: STAR )(\*)|\
(?# 10: LBRA )(\[)|\
(?# 11: RBRA )(\])|\
(?# 12: LITERAL )\{(\d+)\}\r\n|\
(?# 13: PLUS )(\+)|\
(?# 14: PERCENT )(%)|\
(?# 15: CRLF )(\r\n)|\
(?# 16: EOF )(\z))/ni
DATA_REGEXP = /\G(?:\
(?# 1: SPACE )( )|\
(?# 2: NIL )(NIL)|\
(?# 3: NUMBER )(\d+)|\
(?# 4: QUOTED )"((?:[^\x00\r\n"\\]|\\["\\])*)"|\
(?# 5: LITERAL )\{(\d+)\}\r\n|\
(?# 6: LPAR )(\()|\
(?# 7: RPAR )(\)))/ni
TEXT_REGEXP = /\G(?:\
(?# 1: TEXT )([^\x00\r\n]*))/ni
RTEXT_REGEXP = /\G(?:\
(?# 1: LBRA )(\[)|\
(?# 2: TEXT )([^\x00\r\n]*))/ni
CTEXT_REGEXP = /\G(?:\
(?# 1: TEXT )([^\x00\r\n\]]*))/ni
Token = Struct.new(:symbol, :value)
def response
token = lookahead
case token.symbol
when T_PLUS
result = continue_req
when T_STAR
result = response_untagged
else
result = response_tagged
end
while lookahead.symbol == T_SPACE
# Ignore trailing space for Microsoft Exchange Server
shift_token
end
match(T_CRLF)
match(T_EOF)
return result
end
def continue_req
match(T_PLUS)
token = lookahead
if token.symbol == T_SPACE
shift_token
return ContinuationRequest.new(resp_text, @str)
else
return ContinuationRequest.new(ResponseText.new(nil, ""), @str)
end
end
def response_untagged
match(T_STAR)
match(T_SPACE)
token = lookahead
if token.symbol == T_NUMBER
return numeric_response
elsif token.symbol == T_ATOM
case token.value
when /\A(?:OK|NO|BAD|BYE|PREAUTH)\z/ni
return response_cond
when /\A(?:FLAGS)\z/ni
return flags_response
when /\A(?:ID)\z/ni
return id_response
when /\A(?:LIST|LSUB|XLIST)\z/ni
return list_response
when /\A(?:NAMESPACE)\z/ni
return namespace_response
when /\A(?:QUOTA)\z/ni
return getquota_response
when /\A(?:QUOTAROOT)\z/ni
return getquotaroot_response
when /\A(?:ACL)\z/ni
return getacl_response
when /\A(?:SEARCH|SORT)\z/ni
return search_response
when /\A(?:THREAD)\z/ni
return thread_response
when /\A(?:STATUS)\z/ni
return status_response
when /\A(?:CAPABILITY)\z/ni
return capability_response
when /\A(?:NOOP)\z/ni
return ignored_response
else
return text_response
end
else
parse_error("unexpected token %s", token.symbol)
end
end
def response_tagged
tag = astring_chars
match(T_SPACE)
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return TaggedResponse.new(tag, name, resp_text, @str)
end
def response_cond
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return UntaggedResponse.new(name, resp_text, @str)
end
def numeric_response
n = number
match(T_SPACE)
token = match(T_ATOM)
name = token.value.upcase
case name
when "EXISTS", "RECENT", "EXPUNGE"
return UntaggedResponse.new(name, n, @str)
when "FETCH"
shift_token
match(T_SPACE)
data = FetchData.new(n, msg_att(n))
return UntaggedResponse.new(name, data, @str)
end
end
def msg_att(n)
match(T_LPAR)
attr = {}
while true
token = lookahead
case token.symbol
when T_RPAR
shift_token
break
when T_SPACE
shift_token
next
end
case token.value
when /\A(?:ENVELOPE)\z/ni
name, val = envelope_data
when /\A(?:FLAGS)\z/ni
name, val = flags_data
when /\A(?:INTERNALDATE)\z/ni
name, val = internaldate_data
when /\A(?:RFC822(?:\.HEADER|\.TEXT)?)\z/ni
name, val = rfc822_text
when /\A(?:RFC822\.SIZE)\z/ni
name, val = rfc822_size
when /\A(?:BODY(?:STRUCTURE)?)\z/ni
name, val = body_data
when /\A(?:UID)\z/ni
name, val = uid_data
when /\A(?:MODSEQ)\z/ni
name, val = modseq_data
else
parse_error("unknown attribute `%s' for {%d}", token.value, n)
end
attr[name] = val
end
return attr
end
def envelope_data
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return name, envelope
end
def envelope
@lex_state = EXPR_DATA
token = lookahead
if token.symbol == T_NIL
shift_token
result = nil
else
match(T_LPAR)
date = nstring
match(T_SPACE)
subject = nstring
match(T_SPACE)
from = address_list
match(T_SPACE)
sender = address_list
match(T_SPACE)
reply_to = address_list
match(T_SPACE)
to = address_list
match(T_SPACE)
cc = address_list
match(T_SPACE)
bcc = address_list
match(T_SPACE)
in_reply_to = nstring
match(T_SPACE)
message_id = nstring
match(T_RPAR)
result = Envelope.new(date, subject, from, sender, reply_to,
to, cc, bcc, in_reply_to, message_id)
end
@lex_state = EXPR_BEG
return result
end
def flags_data
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return name, flag_list
end
def internaldate_data
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
token = match(T_QUOTED)
return name, token.value
end
def rfc822_text
token = match(T_ATOM)
name = token.value.upcase
token = lookahead
if token.symbol == T_LBRA
shift_token
match(T_RBRA)
end
match(T_SPACE)
return name, nstring
end
def rfc822_size
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return name, number
end
def body_data
token = match(T_ATOM)
name = token.value.upcase
token = lookahead
if token.symbol == T_SPACE
shift_token
return name, body
end
name.concat(section)
token = lookahead
if token.symbol == T_ATOM
name.concat(token.value)
shift_token
end
match(T_SPACE)
data = nstring
return name, data
end
def body
@lex_state = EXPR_DATA
token = lookahead
if token.symbol == T_NIL
shift_token
result = nil
else
match(T_LPAR)
token = lookahead
if token.symbol == T_LPAR
result = body_type_mpart
else
result = body_type_1part
end
match(T_RPAR)
end
@lex_state = EXPR_BEG
return result
end
def body_type_1part
token = lookahead
case token.value
when /\A(?:TEXT)\z/ni
return body_type_text
when /\A(?:MESSAGE)\z/ni
return body_type_msg
when /\A(?:ATTACHMENT)\z/ni
return body_type_attachment
when /\A(?:MIXED)\z/ni
return body_type_mixed
else
return body_type_basic
end
end
def body_type_basic
mtype, msubtype = media_type
token = lookahead
if token.symbol == T_RPAR
return BodyTypeBasic.new(mtype, msubtype)
end
match(T_SPACE)
param, content_id, desc, enc, size = body_fields
md5, disposition, language, extension = body_ext_1part
return BodyTypeBasic.new(mtype, msubtype,
param, content_id,
desc, enc, size,
md5, disposition, language, extension)
end
def body_type_text
mtype, msubtype = media_type
match(T_SPACE)
param, content_id, desc, enc, size = body_fields
match(T_SPACE)
lines = number
md5, disposition, language, extension = body_ext_1part
return BodyTypeText.new(mtype, msubtype,
param, content_id,
desc, enc, size,
lines,
md5, disposition, language, extension)
end
def body_type_msg
mtype, msubtype = media_type
match(T_SPACE)
param, content_id, desc, enc, size = body_fields
token = lookahead
if token.symbol == T_RPAR
# If this is not message/rfc822, we shouldn't apply the RFC822
# spec to it. We should handle anything other than
# message/rfc822 using multipart extension data [rfc3501] (i.e.
# the data itself won't be returned, we would have to retrieve it
# with BODYSTRUCTURE instead of with BODY
# Also, sometimes a message/rfc822 is included as a large
# attachment instead of having all of the other details
# (e.g. attaching a .eml file to an email)
if msubtype == "RFC822"
return BodyTypeMessage.new(mtype, msubtype, param, content_id,
desc, enc, size, nil, nil, nil, nil,
nil, nil, nil)
else
return BodyTypeExtension.new(mtype, msubtype,
param, content_id,
desc, enc, size)
end
end
match(T_SPACE)
env = envelope
match(T_SPACE)
b = body
match(T_SPACE)
lines = number
md5, disposition, language, extension = body_ext_1part
return BodyTypeMessage.new(mtype, msubtype,
param, content_id,
desc, enc, size,
env, b, lines,
md5, disposition, language, extension)
end
def body_type_attachment
mtype = case_insensitive_string
match(T_SPACE)
param = body_fld_param
return BodyTypeAttachment.new(mtype, nil, param)
end
def body_type_mixed
mtype = "MULTIPART"
msubtype = case_insensitive_string
param, disposition, language, extension = body_ext_mpart
return BodyTypeBasic.new(mtype, msubtype, param, nil, nil, nil, nil, nil, disposition, language, extension)
end
def body_type_mpart
parts = []
while true
token = lookahead
if token.symbol == T_SPACE
shift_token
break
end
parts.push(body)
end
mtype = "MULTIPART"
msubtype = case_insensitive_string
param, disposition, language, extension = body_ext_mpart
return BodyTypeMultipart.new(mtype, msubtype, parts,
param, disposition, language,
extension)
end
def media_type
mtype = case_insensitive_string
token = lookahead
if token.symbol != T_SPACE
return mtype, nil
end
match(T_SPACE)
msubtype = case_insensitive_string
return mtype, msubtype
end
def body_fields
param = body_fld_param
match(T_SPACE)
content_id = nstring
match(T_SPACE)
desc = nstring
match(T_SPACE)
enc = case_insensitive_string
match(T_SPACE)
size = number
return param, content_id, desc, enc, size
end
def body_fld_param
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
end
match(T_LPAR)
param = {}
while true
token = lookahead
case token.symbol
when T_RPAR
shift_token
break
when T_SPACE
shift_token
end
name = case_insensitive_string
match(T_SPACE)
val = string
param[name] = val
end
return param
end
def body_ext_1part
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return nil
end
md5 = nstring
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return md5
end
disposition = body_fld_dsp
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return md5, disposition
end
language = body_fld_lang
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return md5, disposition, language
end
extension = body_extensions
return md5, disposition, language, extension
end
def body_ext_mpart
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return nil
end
param = body_fld_param
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return param
end
disposition = body_fld_dsp
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return param, disposition
end
language = body_fld_lang
token = lookahead
if token.symbol == T_SPACE
shift_token
else
return param, disposition, language
end
extension = body_extensions
return param, disposition, language, extension
end
def body_fld_dsp
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
end
match(T_LPAR)
dsp_type = case_insensitive_string
match(T_SPACE)
param = body_fld_param
match(T_RPAR)
return ContentDisposition.new(dsp_type, param)
end
def body_fld_lang
token = lookahead
if token.symbol == T_LPAR
shift_token
result = []
while true
token = lookahead
case token.symbol
when T_RPAR
shift_token
return result
when T_SPACE
shift_token
end
result.push(case_insensitive_string)
end
else
lang = nstring
if lang
return lang.upcase
else
return lang
end
end
end
def body_extensions
result = []
while true
token = lookahead
case token.symbol
when T_RPAR
return result
when T_SPACE
shift_token
end
result.push(body_extension)
end
end
def body_extension
token = lookahead
case token.symbol
when T_LPAR
shift_token
result = body_extensions
match(T_RPAR)
return result
when T_NUMBER
return number
else
return nstring
end
end
def section
str = String.new
token = match(T_LBRA)
str.concat(token.value)
token = match(T_ATOM, T_NUMBER, T_RBRA)
if token.symbol == T_RBRA
str.concat(token.value)
return str
end
str.concat(token.value)
token = lookahead
if token.symbol == T_SPACE
shift_token
str.concat(token.value)
token = match(T_LPAR)
str.concat(token.value)
while true
token = lookahead
case token.symbol
when T_RPAR
str.concat(token.value)
shift_token
break
when T_SPACE
shift_token
str.concat(token.value)
end
str.concat(format_string(astring))
end
end
token = match(T_RBRA)
str.concat(token.value)
return str
end
def format_string(str)
case str
when ""
return '""'
when /[\x80-\xff\r\n]/n
# literal
return "{" + str.bytesize.to_s + "}" + CRLF + str
when /[(){ \x00-\x1f\x7f%*"\\]/n
# quoted string
return '"' + str.gsub(/["\\]/n, "\\\\\\&") + '"'
else
# atom
return str
end
end
def uid_data
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return name, number
end
def modseq_data
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
match(T_LPAR)
modseq = number
match(T_RPAR)
return name, modseq
end
def ignored_response
while lookahead.symbol != T_CRLF
shift_token
end
return IgnoredResponse.new(@str)
end
def text_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return UntaggedResponse.new(name, text)
end
def flags_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return UntaggedResponse.new(name, flag_list, @str)
end
def list_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
return UntaggedResponse.new(name, mailbox_list, @str)
end
def mailbox_list
attr = flag_list
match(T_SPACE)
token = match(T_QUOTED, T_NIL)
if token.symbol == T_NIL
delim = nil
else
delim = token.value
end
match(T_SPACE)
name = astring
return MailboxList.new(attr, delim, name)
end
def getquota_response
# If quota never established, get back
# `NO Quota root does not exist'.
# If quota removed, get `()' after the
# folder spec with no mention of `STORAGE'.
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
mailbox = astring
match(T_SPACE)
match(T_LPAR)
token = lookahead
case token.symbol
when T_RPAR
shift_token
data = MailboxQuota.new(mailbox, nil, nil)
return UntaggedResponse.new(name, data, @str)
when T_ATOM
shift_token
match(T_SPACE)
token = match(T_NUMBER)
usage = token.value
match(T_SPACE)
token = match(T_NUMBER)
quota = token.value
match(T_RPAR)
data = MailboxQuota.new(mailbox, usage, quota)
return UntaggedResponse.new(name, data, @str)
else
parse_error("unexpected token %s", token.symbol)
end
end
def getquotaroot_response
# Similar to getquota, but only admin can use getquota.
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
mailbox = astring
quotaroots = []
while true
token = lookahead
break unless token.symbol == T_SPACE
shift_token
quotaroots.push(astring)
end
data = MailboxQuotaRoot.new(mailbox, quotaroots)
return UntaggedResponse.new(name, data, @str)
end
def getacl_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
mailbox = astring
data = []
token = lookahead
if token.symbol == T_SPACE
shift_token
while true
token = lookahead
case token.symbol
when T_CRLF
break
when T_SPACE
shift_token
end
user = astring
match(T_SPACE)
rights = astring
data.push(MailboxACLItem.new(user, rights, mailbox))
end
end
return UntaggedResponse.new(name, data, @str)
end
def search_response
token = match(T_ATOM)
name = token.value.upcase
token = lookahead
if token.symbol == T_SPACE
shift_token
data = []
while true
token = lookahead
case token.symbol
when T_CRLF
break
when T_SPACE
shift_token
when T_NUMBER
data.push(number)
when T_LPAR
# TODO: include the MODSEQ value in a response
shift_token
match(T_ATOM)
match(T_SPACE)
match(T_NUMBER)
match(T_RPAR)
end
end
else
data = []
end
return UntaggedResponse.new(name, data, @str)
end
def thread_response
token = match(T_ATOM)
name = token.value.upcase
token = lookahead
if token.symbol == T_SPACE
threads = []
while true
shift_token
token = lookahead
case token.symbol
when T_LPAR
threads << thread_branch(token)
when T_CRLF
break
end
end
else
# no member
threads = []
end
return UntaggedResponse.new(name, threads, @str)
end
def thread_branch(token)
rootmember = nil
lastmember = nil
while true
shift_token # ignore first T_LPAR
token = lookahead
case token.symbol
when T_NUMBER
# new member
newmember = ThreadMember.new(number, [])
if rootmember.nil?
rootmember = newmember
else
lastmember.children << newmember
end
lastmember = newmember
when T_SPACE
# do nothing
when T_LPAR
if rootmember.nil?
# dummy member
lastmember = rootmember = ThreadMember.new(nil, [])
end
lastmember.children << thread_branch(token)
when T_RPAR
break
end
end
return rootmember
end
def status_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
mailbox = astring
match(T_SPACE)
match(T_LPAR)
attr = {}
while true
token = lookahead
case token.symbol
when T_RPAR
shift_token
break
when T_SPACE
shift_token
end
token = match(T_ATOM)
key = token.value.upcase
match(T_SPACE)
val = number
attr[key] = val
end
data = StatusData.new(mailbox, attr)
return UntaggedResponse.new(name, data, @str)
end
def capability_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
UntaggedResponse.new(name, capability_data, @str)
end
def capability_data
data = []
while true
token = lookahead
case token.symbol
when T_CRLF, T_RBRA
break
when T_SPACE
shift_token
next
end
data.push(atom.upcase)
end
data
end
def id_response
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
token = match(T_LPAR, T_NIL)
if token.symbol == T_NIL
return UntaggedResponse.new(name, nil, @str)
else
data = {}
while true
token = lookahead
case token.symbol
when T_RPAR
shift_token
break
when T_SPACE
shift_token
next
else
key = string
match(T_SPACE)
val = nstring
data[key] = val
end
end
return UntaggedResponse.new(name, data, @str)
end
end
def namespace_response
@lex_state = EXPR_DATA
token = lookahead
token = match(T_ATOM)
name = token.value.upcase
match(T_SPACE)
personal = namespaces
match(T_SPACE)
other = namespaces
match(T_SPACE)
shared = namespaces
@lex_state = EXPR_BEG
data = Namespaces.new(personal, other, shared)
return UntaggedResponse.new(name, data, @str)
end
def namespaces
token = lookahead
# empty () is not allowed, so nil is functionally identical to empty.
data = []
if token.symbol == T_NIL
shift_token
else
match(T_LPAR)
loop do
data << namespace
break unless lookahead.symbol == T_SPACE
shift_token
end
match(T_RPAR)
end
data
end
def namespace
match(T_LPAR)
prefix = match(T_QUOTED, T_LITERAL).value
match(T_SPACE)
delimiter = string
extensions = namespace_response_extensions
match(T_RPAR)
Namespace.new(prefix, delimiter, extensions)
end
def namespace_response_extensions
data = {}
token = lookahead
if token.symbol == T_SPACE
shift_token
name = match(T_QUOTED, T_LITERAL).value
data[name] ||= []
match(T_SPACE)
match(T_LPAR)
loop do
data[name].push match(T_QUOTED, T_LITERAL).value
break unless lookahead.symbol == T_SPACE
shift_token
end
match(T_RPAR)
end
data
end
# text = 1*TEXT-CHAR
# TEXT-CHAR = <any CHAR except CR and LF>
def text
match(T_TEXT, lex_state: EXPR_TEXT).value
end
# resp-text = ["[" resp-text-code "]" SP] text
def resp_text
token = match(T_LBRA, T_TEXT, lex_state: EXPR_RTEXT)
case token.symbol
when T_LBRA
code = resp_text_code
match(T_RBRA)
accept_space # violating RFC
ResponseText.new(code, text)
when T_TEXT
ResponseText.new(nil, token.value)
end
end
# See https://www.rfc-editor.org/errata/rfc3501
#
# resp-text-code = "ALERT" /
# "BADCHARSET" [SP "(" charset *(SP charset) ")" ] /
# capability-data / "PARSE" /
# "PERMANENTFLAGS" SP "("
# [flag-perm *(SP flag-perm)] ")" /
# "READ-ONLY" / "READ-WRITE" / "TRYCREATE" /
# "UIDNEXT" SP nz-number / "UIDVALIDITY" SP nz-number /
# "UNSEEN" SP nz-number /
# atom [SP 1*<any TEXT-CHAR except "]">]
def resp_text_code
token = match(T_ATOM)
name = token.value.upcase
case name
when /\A(?:ALERT|PARSE|READ-ONLY|READ-WRITE|TRYCREATE|NOMODSEQ)\z/n
result = ResponseCode.new(name, nil)
when /\A(?:BADCHARSET)\z/n
result = ResponseCode.new(name, charset_list)
when /\A(?:CAPABILITY)\z/ni
result = ResponseCode.new(name, capability_data)
when /\A(?:PERMANENTFLAGS)\z/n
match(T_SPACE)
result = ResponseCode.new(name, flag_list)
when /\A(?:UIDVALIDITY|UIDNEXT|UNSEEN)\z/n
match(T_SPACE)
result = ResponseCode.new(name, number)
else
token = lookahead
if token.symbol == T_SPACE
shift_token
token = match(T_TEXT, lex_state: EXPR_CTEXT)
result = ResponseCode.new(name, token.value)
else
result = ResponseCode.new(name, nil)
end
end
return result
end
def charset_list
result = []
if accept(T_SPACE)
match(T_LPAR)
result << charset
while accept(T_SPACE)
result << charset
end
match(T_RPAR)
end
result
end
def address_list
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
else
result = []
match(T_LPAR)
while true
token = lookahead
case token.symbol
when T_RPAR
shift_token
break
when T_SPACE
shift_token
end
result.push(address)
end
return result
end
end
ADDRESS_REGEXP = /\G\
(?# 1: NAME )(?:NIL|"((?:[^\x80-\xff\x00\r\n"\\]|\\["\\])*)") \
(?# 2: ROUTE )(?:NIL|"((?:[^\x80-\xff\x00\r\n"\\]|\\["\\])*)") \
(?# 3: MAILBOX )(?:NIL|"((?:[^\x80-\xff\x00\r\n"\\]|\\["\\])*)") \
(?# 4: HOST )(?:NIL|"((?:[^\x80-\xff\x00\r\n"\\]|\\["\\])*)")\
\)/ni
def address
match(T_LPAR)
if @str.index(ADDRESS_REGEXP, @pos)
# address does not include literal.
@pos = $~.end(0)
name = $1
route = $2
mailbox = $3
host = $4
for s in [name, route, mailbox, host]
if s
s.gsub!(/\\(["\\])/n, "\\1")
end
end
else
name = nstring
match(T_SPACE)
route = nstring
match(T_SPACE)
mailbox = nstring
match(T_SPACE)
host = nstring
match(T_RPAR)
end
return Address.new(name, route, mailbox, host)
end
FLAG_REGEXP = /\
(?# FLAG )\\([^\x80-\xff(){ \x00-\x1f\x7f%"\\]+)|\
(?# ATOM )([^\x80-\xff(){ \x00-\x1f\x7f%*"\\]+)/n
def flag_list
if @str.index(/\(([^)]*)\)/ni, @pos)
@pos = $~.end(0)
return $1.scan(FLAG_REGEXP).collect { |flag, atom|
if atom
atom
else
symbol = flag.capitalize.intern
@flag_symbols[symbol] = true
if @flag_symbols.length > IMAP.max_flag_count
raise FlagCountError, "number of flag symbols exceeded"
end
symbol
end
}
else
parse_error("invalid flag list")
end
end
def nstring
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
else
return string
end
end
def astring
token = lookahead
if string_token?(token)
return string
else
return astring_chars
end
end
def string
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
end
token = match(T_QUOTED, T_LITERAL)
return token.value
end
STRING_TOKENS = [T_QUOTED, T_LITERAL, T_NIL]
def string_token?(token)
return STRING_TOKENS.include?(token.symbol)
end
def case_insensitive_string
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
end
token = match(T_QUOTED, T_LITERAL)
return token.value.upcase
end
# atom = 1*ATOM-CHAR
# ATOM-CHAR = <any CHAR except atom-specials>
ATOM_TOKENS = [
T_ATOM,
T_NUMBER,
T_NIL,
T_LBRA,
T_PLUS
]
def atom
-combine_adjacent(*ATOM_TOKENS)
end
# ASTRING-CHAR = ATOM-CHAR / resp-specials
# resp-specials = "]"
ASTRING_CHARS_TOKENS = [*ATOM_TOKENS, T_RBRA]
def astring_chars
combine_adjacent(*ASTRING_CHARS_TOKENS)
end
def combine_adjacent(*tokens)
result = "".b
while token = accept(*tokens)
result << token.value
end
if result.empty?
parse_error('unexpected token %s (expected %s)',
lookahead.symbol, args.join(" or "))
end
result
end
# See https://www.rfc-editor.org/errata/rfc3501
#
# charset = atom / quoted
def charset
if token = accept(T_QUOTED)
token.value
else
atom
end
end
def number
token = lookahead
if token.symbol == T_NIL
shift_token
return nil
end
token = match(T_NUMBER)
return token.value.to_i
end
def nil_atom
match(T_NIL)
return nil
end
SPACES_REGEXP = /\G */n
# This advances @pos directly so it's safe before changing @lex_state.
def accept_space
if @token
shift_token if @token.symbol == T_SPACE
elsif @str[@pos] == " "
@pos += 1
end
end
# The RFC is very strict about this and usually we should be too.
# But skipping spaces is usually a safe workaround for buggy servers.
#
# This advances @pos directly so it's safe before changing @lex_state.
def accept_spaces
shift_token if @token&.symbol == T_SPACE
if @str.index(SPACES_REGEXP, @pos)
@pos = $~.end(0)
end
end
def match(*args, lex_state: @lex_state)
if @token && lex_state != @lex_state
parse_error("invalid lex_state change to %s with unconsumed token",
lex_state)
end
begin
@lex_state, original_lex_state = lex_state, @lex_state
token = lookahead
unless args.include?(token.symbol)
parse_error('unexpected token %s (expected %s)',
token.symbol.id2name,
args.collect {|i| i.id2name}.join(" or "))
end
shift_token
return token
ensure
@lex_state = original_lex_state
end
end
# like match, but does not raise error on failure.
#
# returns and shifts token on successful match
# returns nil and leaves @token unshifted on no match
def accept(*args)
token = lookahead
if args.include?(token.symbol)
shift_token
token
end
end
def lookahead
@token ||= next_token
end
def shift_token
@token = nil
end
def next_token
case @lex_state
when EXPR_BEG
if @str.index(BEG_REGEXP, @pos)
@pos = $~.end(0)
if $1
return Token.new(T_SPACE, $+)
elsif $2
return Token.new(T_NIL, $+)
elsif $3
return Token.new(T_NUMBER, $+)
elsif $4
return Token.new(T_ATOM, $+)
elsif $5
return Token.new(T_QUOTED,
$+.gsub(/\\(["\\])/n, "\\1"))
elsif $6
return Token.new(T_LPAR, $+)
elsif $7
return Token.new(T_RPAR, $+)
elsif $8
return Token.new(T_BSLASH, $+)
elsif $9
return Token.new(T_STAR, $+)
elsif $10
return Token.new(T_LBRA, $+)
elsif $11
return Token.new(T_RBRA, $+)
elsif $12
len = $+.to_i
val = @str[@pos, len]
@pos += len
return Token.new(T_LITERAL, val)
elsif $13
return Token.new(T_PLUS, $+)
elsif $14
return Token.new(T_PERCENT, $+)
elsif $15
return Token.new(T_CRLF, $+)
elsif $16
return Token.new(T_EOF, $+)
else
parse_error("[Net::IMAP BUG] BEG_REGEXP is invalid")
end
else
@str.index(/\S*/n, @pos)
parse_error("unknown token - %s", $&.dump)
end
when EXPR_DATA
if @str.index(DATA_REGEXP, @pos)
@pos = $~.end(0)
if $1
return Token.new(T_SPACE, $+)
elsif $2
return Token.new(T_NIL, $+)
elsif $3
return Token.new(T_NUMBER, $+)
elsif $4
return Token.new(T_QUOTED,
$+.gsub(/\\(["\\])/n, "\\1"))
elsif $5
len = $+.to_i
val = @str[@pos, len]
@pos += len
return Token.new(T_LITERAL, val)
elsif $6
return Token.new(T_LPAR, $+)
elsif $7
return Token.new(T_RPAR, $+)
else
parse_error("[Net::IMAP BUG] DATA_REGEXP is invalid")
end
else
@str.index(/\S*/n, @pos)
parse_error("unknown token - %s", $&.dump)
end
when EXPR_TEXT
if @str.index(TEXT_REGEXP, @pos)
@pos = $~.end(0)
if $1
return Token.new(T_TEXT, $+)
else
parse_error("[Net::IMAP BUG] TEXT_REGEXP is invalid")
end
else
@str.index(/\S*/n, @pos)
parse_error("unknown token - %s", $&.dump)
end
when EXPR_RTEXT
if @str.index(RTEXT_REGEXP, @pos)
@pos = $~.end(0)
if $1
return Token.new(T_LBRA, $+)
elsif $2
return Token.new(T_TEXT, $+)
else
parse_error("[Net::IMAP BUG] RTEXT_REGEXP is invalid")
end
else
@str.index(/\S*/n, @pos)
parse_error("unknown token - %s", $&.dump)
end
when EXPR_CTEXT
if @str.index(CTEXT_REGEXP, @pos)
@pos = $~.end(0)
if $1
return Token.new(T_TEXT, $+)
else
parse_error("[Net::IMAP BUG] CTEXT_REGEXP is invalid")
end
else
@str.index(/\S*/n, @pos) #/
parse_error("unknown token - %s", $&.dump)
end
else
parse_error("invalid @lex_state - %s", @lex_state.inspect)
end
end
def parse_error(fmt, *args)
if IMAP.debug
$stderr.printf("@str: %s\n", @str.dump)
$stderr.printf("@pos: %d\n", @pos)
$stderr.printf("@lex_state: %s\n", @lex_state)
if @token
$stderr.printf("@token.symbol: %s\n", @token.symbol)
$stderr.printf("@token.value: %s\n", @token.value.inspect)
end
end
raise ResponseParseError, format(fmt, *args)
end
end
end
end
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