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8.  Macros

8.1.  Macro Definitions

Many mechanisms and modifiers perform macro expansion on part of theterm.

8. マクロ

8.1. マクロの定義

多くのマクロおよび変更子は、要素部分のマクロ展開を実行する。

domain-spec      = macro-string domain-end
domain-end       = ( "." toplabel [ "." ] ) / macro-expand
toplabel         = ( *alphanum ALPHA *alphanum ) /
                   ( 1*alphanum "-" *( alphanum / "-" ) alphanum )
                   ; LDH rule plus additional TLD restrictions
                   ; (see [RFC3696], Section 2)
alphanum         = ALPHA / DIGIT
explain-string   = *( macro-string / SP )
macro-string     = *( macro-expand / macro-literal )
macro-expand     = ( "%{" macro-letter transformers *delimiter "}" )
                   / "%%" / "%_" / "%-"
macro-literal    = %x21-24 / %x26-7E
                   ; visible characters except "%"
macro-letter     = "s" / "l" / "o" / "d" / "i" / "p" / "h" /
                   "c" / "r" / "t"
transformers     = *DIGIT [ "r" ]
delimiter        = "." / "-" / "+" / "," / "/" / "_" / "="

domain-spec      = macro-string domain-end
domain-end       = ( "." toplabel [ "." ] ) / macro-expand
toplabel         = ( *alphanum ALPHA *alphanum ) /
                   ( 1*alphanum "-" *( alphanum / "-" ) alphanum )
　　　　　　　　　　　　; TLD制限を追加したLDH規則
　　　　　　　　　　　　; （［RFC3696］の2章を参照のこと）
alphanum         = ALPHA / DIGIT
explain-string   = *( macro-string / SP )
macro-string     = *( macro-expand / macro-literal )
macro-expand     = ( "%{" macro-letter transformers *delimiter "}" )
                   / "%%" / "%_" / "%-"

macro-literal    = %x21-24 / %x26-7E
                   ; “%”以外の可視文字
macro-letter     = "s" / "l" / "o" / "d" / "i" / "p" / "h" /
                   "c" / "r" / "t"
transformers     = *DIGIT [ "r" ]
delimiter        = "." / "-" / "+" / "," / "/" / "_" / "="

A literal "%" is expressed by "%%".

   "%_" expands to a single " " space.
   "%-" expands to a URL-encoded space, viz., "%20".

“%”文字は“%%”で表現される。

“%_”は単一の“ ”空白に展開される。
“%-”はURL符号化による空白、すなわち“%20”に展開される。

The following macro letters are expanded in term arguments:

   s = <sender>
   l = local-part of <sender>
   o = domain of <sender>
   d = <domain>
   i = <ip>
   p = the validated domain name of <ip>
   v = the string "in-addr" if <ip> is ipv4, or "ip6" if <ip> is ipv6
   h = HELO/EHLO domain

以下のマクロ文字は引数に展開される:

s = <sender>
l = <sender> のローカル部分
o = <sender> のドメイン
d = <domain>
i = <ip>
p = <ip> の有効なドメイン名
v = <ip> がipv4の場合は“in-addr”、<ip> がipv6の場合は“ip6”という文字列
h = HELO/EHLOドメイン

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