ew-var.el

   1 (provide 'ew-var)
   2
   3 ;;; user customizable variables.
   4
   5 (defvar ew-decode-sticked-encoded-word nil)
   6 (defvar ew-decode-quoted-encoded-word nil)
   7 (defvar ew-ignore-75bytes-limit nil)
   8 (defvar ew-ignore-76bytes-limit nil)
   9 (defvar ew-permit-sticked-comment nil)
  10 (defvar ew-permit-sticked-special nil)
  11 (defvar ew-permit-null-encoded-text nil) ; affect when loading time.
  12
  13 (defvar ew-remove-bare-crlf nil)
  14 (defvar ew-default-mime-charset 'x-ctext)
  15
  16 ;;;
  17 (defvar ew-decode-field-syntax-alist
  18 '((from                 ew-scan-unibyte-std11 . ew:tag-mailbox+)
  19   (sender               ew-scan-unibyte-std11 . ew:tag-mailbox)
  20   (to                   ew-scan-unibyte-std11 . ew:tag-address+)
  21   (resent-to            ew-scan-unibyte-std11 . ew:tag-address+)
  22   (cc                   ew-scan-unibyte-std11 . ew:tag-address+)
  23   (resent-cc            ew-scan-unibyte-std11 . ew:tag-address+)
  24   (bcc                  ew-scan-unibyte-std11 . ew:tag-address*)
  25   (resent-bcc           ew-scan-unibyte-std11 . ew:tag-address*)
  26   (message-id           ew-scan-unibyte-std11)
  27   (resent-message-id    ew-scan-unibyte-std11)
  28   (in-reply-to          ew-scan-unibyte-std11 . ew:tag-phrase-msg-id*)
  29   (references           ew-scan-unibyte-std11 . ew:tag-phrase-msg-id*)
  30   (keywords             ew-scan-unibyte-std11 . ew:tag-phrase*)
  31   (subject              ew-scan-unibyte-unstructured)
  32   (comments             ew-scan-unibyte-unstructured)
  33   (encrypted            ew-scan-unibyte-std11)
  34   (date                 ew-scan-unibyte-std11)
  35   (reply-to             ew-scan-unibyte-std11 . ew:tag-address+)
  36   (received             ew-scan-unibyte-std11)
  37   (resent-reply-to      ew-scan-unibyte-std11 . ew:tag-address+)
  38   (resent-from          ew-scan-unibyte-std11 . ew:tag-mailbox+)
  39   (resent-sender        ew-scan-unibyte-std11 . ew:tag-mailbox)
  40   (resent-date          ew-scan-unibyte-std11)
  41   (return-path          ew-scan-unibyte-std11)
  42   (mime-version         ew-scan-unibyte-std11)
  43   (content-type         ew-scan-unibyte-mime)
  44   (content-transfer-encoding    ew-scan-unibyte-mime)
  45   (content-id           ew-scan-unibyte-std11)
  46   (content-description  ew-scan-unibyte-unstructured)
  47   (content-disposition  ew-scan-unibyte-mime)
  48   (approved             ew-scan-unibyte-std11 . ew:tag-address+)
  49   (newsgroups           ew-scan-unibyte-none)
  50   (path                 ew-scan-unibyte-none)
  51   (lines                ew-scan-unibyte-none)
  52   (xref                 ew-scan-unibyte-none)
  53 ))
  54
  55 (defvar ew-decode-field-default-syntax '(ew-scan-unibyte-unstructured))
  56
  57 (defvar ew-parse-error-sit-for-seconds 0)
  58
  59 ;;; constants.
  60
  61 (defconst ew-token-regexp "[-!#-'*+0-9A-Z^-~]+")
  62 (defconst ew-encoded-text-regexp
  63   (if ew-permit-null-encoded-text
  64       "[!->@-~]*"
  65     "[!->@-~]+"))
  66
  67 (defconst ew-encoded-word-regexp
  68   (concat (regexp-quote "=?")
  69           "\\(" ew-token-regexp "\\)"
  70           (regexp-quote "?")
  71           "\\(" ew-token-regexp "\\)"
  72           (regexp-quote "?")
  73           "\\(" ew-encoded-text-regexp "\\)"
  74           (regexp-quote "?=")))
  75
  76 (defconst ew-anchored-encoded-word-regexp
  77   (concat "\\`" ew-encoded-word-regexp "\\'"))
  78
  79 (defconst ew-b-regexp
  80   (eval-when-compile
  81     (concat "\\`\\("
  82             "[A-Za-z0-9+/]"
  83             "[A-Za-z0-9+/]"
  84             "[A-Za-z0-9+/]"
  85             "[A-Za-z0-9+/]"
  86             "\\)*"
  87             "\\("
  88             "[A-Za-z0-9+/]"
  89             "[A-Za-z0-9+/]"
  90             "\\(==\\|[A-Za-z0-9+/]=\\)"
  91             "\\)?"
  92             "\\'")))
  93
  94 (defconst ew-q-regexp
  95   "\\`\\([^=?]\\|=[0-9A-Fa-f][0-9A-Fa-f]\\)*\\'")
  96
  97 (defconst ew-quoting-char ?+)
  98 (defconst ew-quoting-chars-regexp
  99   (concat (regexp-quote (char-to-string ew-quoting-char)) "*"))
 100
 101 (defconst ew-type2-regexp
 102   (concat (regexp-quote "=?")
 103           "\\(" ew-token-regexp "\\)"
 104           (regexp-quote "?")
 105           "\\(" ew-token-regexp "\\)"
 106           (regexp-quote "?")
 107           "\\(" ew-encoded-text-regexp "\\)"
 108           (regexp-quote "?")
 109           "\\'"))
 110
 111 (defconst ew-byte-decoder-alist
 112   '(("B" . ew-decode-b)
 113     ("Q" . ew-decode-q)))
 114
 115 (defconst ew-byte-checker-alist
 116   '(("B" . ew-b-check)
 117     ("Q" . ew-q-check)))
 118
 119 ;;; utilities for variables.
 120
 121 (defun ew-dynamic-options ()
 122   (cons
 123    ew-default-mime-charset
 124    (logior
 125     (if ew-decode-sticked-encoded-word 1 0)
 126     (if ew-decode-quoted-encoded-word 2 0)
 127     (if ew-ignore-75bytes-limit 4 0)
 128     (if ew-ignore-76bytes-limit 8 0)
 129     (if ew-permit-sticked-comment 16 0)
 130     (if ew-permit-sticked-special 32 0)
 131     (if ew-remove-bare-crlf 64 0)
 132     (if ew-permit-null-encoded-text 128 0)
 133     )))