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The parsing methods defined in this module implement various email related
parsing rules.  Principal among them is RFC 5322, which is the followon
to RFC 2822 and primarily a clarification of the former.  It also implements
RFC 2047 encoded word decoding.

RFC 5322 goes to considerable trouble to maintain backward compatibility with
RFC 822 in the parse phase, while cleaning up the structure on the generation
phase.  This parser supports correct RFC 5322 generation by tagging white space
as folding white space only when folding is allowed in the non-obsolete rule
sets.  Actually, the parser is even more generous when accepting input than RFC
5322 mandates, following the spirit of Postel's Law, which RFC 5322 encourages.
Where possible deviations from the standard are annotated on the 'defects'
attribute of tokens that deviate.

The general structure of the parser follows RFC 5322, and uses its terminology
where there is a direct correspondence.  Where the implementation requires a
somewhat different structure than that used by the formal grammar, new terms
that mimic the closest existing terms are used.  Thus, it really helps to have
a copy of RFC 5322 handy when studying this code.

Input to the parser is a string that has already been unfolded according to
RFC 5322 rules.  According to the RFC this unfolding is the very first step, and
this parser leaves the unfolding step to a higher level message parser, which
will have already detected the line breaks that need unfolding while
determining the beginning and end of each header.

The output of the parser is a TokenList object, which is a list subclass.  A
TokenList is a recursive data structure.  The terminal nodes of the structure
are Terminal objects, which are subclasses of str.  These do not correspond
directly to terminal objects in the formal grammar, but are instead more
practical higher level combinations of true terminals.

All TokenList and Terminal objects have a 'value' attribute, which produces the
semantically meaningful value of that part of the parse subtree.  The value of
all whitespace tokens (no matter how many sub-tokens they may contain) is a
single space, as per the RFC rules.  This includes 'CFWS', which is herein
included in the general class of whitespace tokens.  There is one exception to
the rule that whitespace tokens are collapsed into single spaces in values: in
the value of a 'bare-quoted-string' (a quoted-string with no leading or
trailing whitespace), any whitespace that appeared between the quotation marks
is preserved in the returned value.  Note that in all Terminal strings quoted
pairs are turned into their unquoted values.

All TokenList and Terminal objects also have a string value, which attempts to
be a "canonical" representation of the RFC-compliant form of the substring that
produced the parsed subtree, including minimal use of quoted pair quoting.
Whitespace runs are not collapsed.

Comment tokens also have a 'content' attribute providing the string found
between the parens (including any nested comments) with whitespace preserved.

All TokenList and Terminal objects have a 'defects' attribute which is a
possibly empty list all of the defects found while creating the token.  Defects
may appear on any token in the tree, and a composite list of all defects in the
subtree is available through the 'all_defects' attribute of any node.  (For
Terminal notes x.defects == x.all_defects.)

Each object in a parse tree is called a 'token', and each has a 'token_type'
attribute that gives the name from the RFC 5322 grammar that it represents.
Not all RFC 5322 nodes are produced, and there is one non-RFC 5322 node that
may be produced: 'ptext'.  A 'ptext' is a string of printable ascii characters.
It is returned in place of lists of (ctext/quoted-pair) and
(qtext/quoted-pair).

XXX: provide complete list of token types.
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rncCs;t|dƒ\}}}t|dƒ}t|ƒ||fS)actext = <printable ascii except \ ( )>

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rcCsot|ƒ}|s*tjdj|ƒƒ‚|jƒ}|t|ƒd…}t|dƒ}t|ƒ||fS)z®atext = <matches _atext_matcher>

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zíbare-quoted-string = DQUOTE *([FWS] qcontent) [FWS] DQUOTE

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rcCs
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r
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    r)r…rrrr)rZ
quoted_stringr,rrrÚget_quoted_stringbs	


rcCstƒ}|r>|dtkr>t|ƒ\}}|j|ƒ|rl|dtkrltjdj|ƒƒ‚|jdƒr¾yt	|ƒ\}}WqÐtjk
rºt
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rcCsÝtƒ}|s |dtkr8tjdj|ƒƒ‚xl|r¦|dtkr¦t|ƒ\}}|j|ƒ|r;|ddkr;|jtƒ|dd…}q;W|dtkrÓtjdjd|ƒƒ‚||fS)z( dot-text = 1*atext *("." 1*atext)

    rz8expected atom at a start of dot-atom-text but found '{}'r	r'Nz4expected atom at end of dot-atom-text but found '{}'rI)r§rrrr<rrr³)rZ
dot_atom_textr,rrrÚget_dot_atom_texts	

rcCsètƒ}|dtkr8t|ƒ\}}|j|ƒ|jdƒrŠyt|ƒ\}}Wqœtjk
r†t|ƒ\}}YqœXnt|ƒ\}}|j|ƒ|rÞ|dtkrÞt|ƒ\}}|j|ƒ||fS)z† dot-atom = [CFWS] dot-atom-text [CFWS]

    Any place we can have a dot atom, we could instead have an rfc2047 encoded
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    rz=?)	r¦rrrrÿrrrr)rZdot_atomr,rrrÚget_dot_atom¢s	


rcCs¶|dtkr%t|ƒ\}}nd}|ddkrPt|ƒ\}}n=|dtkr{tjdj|ƒƒ‚nt|ƒ\}}|dk	r¬|g|dd…<||fS)aˆword = atom / quoted-string

    Either atom or quoted-string may start with CFWS.  We have to peel off this
    CFWS first to determine which type of word to parse.  Afterward we splice
    the leading CFWS, if any, into the parsed sub-token.

    If neither an atom or a quoted-string is found before the next special, a
    HeaderParseError is raised.

    The token returned is either an Atom or a QuotedString, as appropriate.
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    rNrz1Expected 'atom' or 'quoted-string' but found '{}')rrrÚSPECIALSrrr<r)rÚleaderr,rrrÚget_word»srcCsItƒ}y#t|ƒ\}}|j|ƒWn.tjk
r\|jjtjdƒƒYnXxß|r>|dtkr>|ddkr¿|jtƒ|jjtj	dƒƒ|dd…}q`yt|ƒ\}}WnVtjk
r-|dt
kr&t|ƒ\}}|jjtj	dƒƒn‚YnX|j|ƒq`W||fS)a÷ phrase = 1*word / obs-phrase
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    This means a phrase can be a sequence of words, periods, and CFWS in any
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    words is detected, an ObsoleteHeaderDefect is added to the token's defect
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rcCsßtƒ}d}|dtkr1t|ƒ\}}|sOtjdj|ƒƒ‚yt|ƒ\}}Wnotjk
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rÑ|ddkrÄ|dtkrÄ‚t	ƒ}YnXYnX|dk	rö|g|dd…<|j
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rcCsHtƒ}d}xv|r‡|ddks8|dtkr‡|ddkr|rg|jjtjdƒƒ|jtƒd}|dd…}qn\|ddkrì|jt|dd	ƒƒ|dd…}|jjtjd
ƒƒd}q|r|djdkr|jjtjdƒƒyt	|ƒ\}}d}Wn:tj
k
rv|dtkr`‚t|ƒ\}}YnX|j|ƒqW|djdksÁ|djd
krÚ|djdkrÚ|jjtjdƒƒ|djdks|djd
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		rcCsZt|dƒ\}}}t|dƒ}|rF|jjtjdƒƒt|ƒ||fS)a dtext = <printable ascii except \ [ ]> / obs-dtext
        obs-dtext = obs-NO-WS-CTL / quoted-pair

    We allow anything except the excluded characters, but if we find any
    ASCII other than the RFC defined printable ASCII, a NonPrintableDefect is
    added to the token's defects list.  Quoted pairs are converted to their
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    z[]r¶z(quoted printable found in domain-literal)rürïr5rrrrõ)rr¶rúrrrÚ	get_dtextVs

rcCs:|r
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|ƒ\}}|j|ƒt|ƒ\}}|j|ƒt||ƒr||fS|dt	krJt
|ƒ\}}|j|ƒt||ƒrc||fS|ddkr‹tjd	j|ƒƒ‚|jtdd
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r"cCsëtƒ}d}|dtkr1t|ƒ\}}|sOtjdj|ƒƒ‚|ddkr§t|ƒ\}}|dk	r|g|dd…<|j|ƒ||fSyt|ƒ\}}Wn'tjk
ræt	|ƒ\}}YnX|r|ddkrtjdƒ‚|dk	r+|g|dd…<|j|ƒ|rá|ddkrá|j
jtjdƒƒ|djd	krŽ|d|dd…<xP|rà|ddkrà|jt
ƒt	|d
d…ƒ\}}|j|ƒq‘W||fS)z] domain = dot-atom / domain-literal / obs-domain
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r#cCs«tƒ}t|ƒ\}}|j|ƒ|s?|ddkrb|jjtjdƒƒ||fS|jtddƒƒt|dd…ƒ\}}|j|ƒ||fS)z( addr-spec = local-part "@" domain

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r$cCstƒ}x‰|r”|ddks2|dtkr”|dtkrdt|ƒ\}}|j|ƒq|ddkr|jtƒ|dd…}qW|s¬|ddkrÄtjdj|ƒƒ‚|jtƒt	|dd…ƒ\}}|j|ƒx³|r¯|ddkr¯|jtƒ|dd…}|s7P|dtkrft|ƒ\}}|j|ƒ|ddkrý|jtƒt	|dd…ƒ\}}|j|ƒqýW|sÅtjdƒ‚|ddkrítjd	j|ƒƒ‚|jt
dd
ƒƒ||dd…fS)zù obs-route = obs-domain-list ":"
        obs-domain-list = *(CFWS / ",") "@" domain *("," [CFWS] ["@" domain])

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r(cCs6tƒ}|dtkr8t|ƒ\}}|j|ƒ|sO|ddkrgtjdj|ƒƒ‚|jtddƒƒ|dd…}|ddkræ|jtddƒƒ|jjtj	d	ƒƒ|dd…}||fSyt
|ƒ\}}Wn“tjk
r‘y/t|ƒ\}}|jjtjd
ƒƒWn-tjk
rmtjdj|ƒƒ‚YnX|j|ƒt
|ƒ\}}YnX|j|ƒ|rÈ|ddkrÈ|dd…}n|jjtj	dƒƒ|jtddƒƒ|r,|dtkr,t|ƒ\}}|j|ƒ||fS)
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r+cCsRtƒ}t|ƒ\}}|j|dd…ƒ|jdd…|_||fS)zÇ display-name = phrase

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	r,cCs5tƒ}d}|dtkrOt|ƒ\}}|sOtjdj|ƒƒ‚|ddkrí|dtkr‡tjdj|ƒƒ‚t|ƒ\}}|s·tjdj|ƒƒ‚|dk	rà|g|ddd…<d}|j|ƒt	|ƒ\}}|dk	r|g|dd…<|j|ƒ||fS)z, name-addr = [display-name] angle-addr

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r-cCs¹tƒ}yt|ƒ\}}Wn[tjk
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r¢r-rrr$r<r[r>rFr)rr”r,rrrÚget_mailboxSs		
r.cCsŒtƒ}xv|r|d|kr|dtkr_|jt|ddƒƒ|dd…}qt|ƒ\}}|j|ƒqW||fS)zÍ Read everything up to one of the chars in endchars.

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r/cCsMtƒ}x7|rB|ddkrBy#t|ƒ\}}|j|ƒWn`tjk
r§d}|dtkrt|ƒ\}}|s—|ddkrÀ|j|ƒ|jjtjdƒƒq£t	|dƒ\}}|dk	rô|g|dd…<|j|ƒ|jjtj
dƒƒn†|ddkrI|jjtjdƒƒnZt	|dƒ\}}|dk	r}|g|dd…<|j|ƒ|jjtj
dƒƒYnX|r|ddkr|d
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dƒƒ|r|ddkr|jt
ƒ|dd…}qW||fS)aJ mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
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    For this routine we go outside the formal grammar in order to improve error
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r1cCsctƒ}|s2|jjtjdƒƒ||fSd}|r½|dtkr½t|ƒ\}}|s–|jjtjdƒƒ|j|ƒ||fS|ddkr½|j|ƒ||fSt|ƒ\}}t|j	ƒdkr-|dk	rý|j|ƒ|j
|ƒ|jjtjdƒƒ||fS|dk	rL|g|dd…<|j|ƒ||fS)zg group-list = mailbox-list / CFWS / obs-group-list
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r2cCsˆtƒ}t|ƒ\}}|s2|ddkrJtjdj|ƒƒ‚|j|ƒ|jtddƒƒ|dd…}|r½|ddkr½|jtddƒƒ||dd…fSt|ƒ\}}|j|ƒ|sû|jjtj	d	ƒƒ|ddkr#tjd
j|ƒƒ‚|jtddƒƒ|dd…}|r~|dt
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r3cCs”tƒ}yt|ƒ\}}Wn[tjk
r|yt|ƒ\}}Wn-tjk
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    Note that counter-intuitively, an address can be either a single address or
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    zexpected address but found '{}')r‘r3rrr.r<r)rrr,rrrÚget_addressös	
r4cCs_tƒ}xI|rTy#t|ƒ\}}|j|ƒWn…tjk
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|gƒƒ|jjtjdƒƒn|ddkrG|jjtjdƒƒnct	|dƒ\}}|dk	r{|g|dd…<|jt
|gƒƒ|jjtjdƒƒWYdd}~XnX|r%|ddkr%|d
d}d|_t	|dƒ\}}|j
|ƒ|jjtjdƒƒ|r|jtdd	ƒƒ|dd…}qW||fS)a address_list = (address *("," address)) / obs-addr-list
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    We depart from the formal grammar here by continuing to parse until the end
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    Nrrñz"address-list entry with no contentzinvalid address in address-listzempty element in address-listr'zinvalid-mailboxzlist-separatorrI)rŒr4rrrrrr5rr/r‘rÒrFrrï)rZaddress_listr,Úerrrr”rrrÚget_address_list	sN
		



	

r6cCsstƒ}|s,|jjtjdƒƒ|S|dtkrzt|ƒ\}}|j|ƒ|sz|jjtjdƒƒd}xH|rÊ|ddkrÊ|dtkrÊ||d7}|dd…}qƒW|jƒs|jjtjdj	|ƒƒƒ|jt
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ƒƒ|rl|dtkrlt|ƒ\}}|j|ƒ|sƒ|ddkrË|jdk	r«|jjtjdƒƒ|rÇ|jt
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ddƒƒ|dd…}|r&|dtkr&t|ƒ\}}|j|ƒ|sX|jdk	rT|jjtjdƒƒ|Sd}x8|r˜|dtkr˜||d7}|dd…}qaW|jƒsà|jjtjd
j	|ƒƒƒ|jt
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ƒƒ|r:|dtkr:t|ƒ\}}|j|ƒ|ro|jjtjdƒƒ|jt
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r;cCsŒtƒ}xv|r|ddkr|dtkr_|jt|ddƒƒ|dd…}qt|ƒ\}}|j|ƒqW||fS)zÁ Read everything up to the next ';'.

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    zexpected ttext but found '{}'NÚttext)Ú_non_token_end_matcherrrr<r’r(rïrõ)rr
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r?cCsÊtƒ}|r>|dtkr>t|ƒ\}}|j|ƒ|rl|dtkrltjdj|ƒƒ‚t|ƒ\}}|j|ƒ|rÀ|dtkrÀt|ƒ\}}|j|ƒ||fS)zútoken = [CFWS] 1*ttext [CFWS]

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    rzexpected token but found '{}')	r€rrrÚ
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rAcCsot|ƒ}|s*tjdj|ƒƒ‚|jƒ}|t|ƒd…}t|dƒ}t|ƒ||fS)aQattrtext = 1*(any non-ATTRIBUTE_ENDS character)

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    z expected attrtext but found {!r}NrÅ)Ú_non_attribute_end_matcherrrr<r’r(rïrõ)rr
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rCcCsÊtƒ}|r>|dtkr>t|ƒ\}}|j|ƒ|rl|dtkrltjdj|ƒƒ‚t|ƒ\}}|j|ƒ|rÀ|dtkrÀt|ƒ\}}|j|ƒ||fS)aH [CFWS] 1*attrtext [CFWS]

    This version of the BNF makes the CFWS explicit, and as usual we use a
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    rzexpected token but found '{}')	rÃrrrÚATTRIBUTE_ENDSrrr<rC)rrÄr,rrrÚ
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rEcCsot|ƒ}|s*tjdj|ƒƒ‚|jƒ}|t|ƒd…}t|dƒ}t|ƒ||fS)zÛattrtext = 1*(any non-ATTRIBUTE_ENDS character plus '%')

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rIcCs3tƒ}|s |ddkr8tjdj|ƒƒ‚|jtddƒƒ|dd…}|sv|djƒrŽtjdj|ƒƒ‚d}x8|rÎ|djƒrÎ||d7}|dd…}q—W|dd	kr|d	kr|jjtjd
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    The formal BNF is more complicated because leading 0s are not allowed.  We
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ddƒƒ|dd	…}|d	k	r¶tƒ}x€|r¬|dtkrXt|ƒ\}}nD|dd
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