Re: Converting a string to valid XHTML id?

["Davis Herring" <herring@lanl.gov>]

>   (let ((old (assoc id org-newhtml-escaped-ids))

Wouldn't it be easier to do something like percent encoding?  Map
everything that isn't [-.a-zA-Z0-9] onto _HH.  Multibyte characters could
be handled by writing their UTF-8 encoding, or else by escaping as _nHH...
where n is the number of hex digits needed (itself always a single digit):

;; Uses Emacs' internal encoding instead of UTF-8 proper.
(defun org-newhtml-escape-id (str)
  "Return a valid xhtml id attribute string.
See URL `http://xhtml.com/en/xhtml/reference/attribute-data-types/#id'."
  (replace-regexp-in-string
   "[^-.a-zA-Z0-9]" (lambda (c)
                      (mapconcat (lambda (d) (format "_%02x" d))
                                 (string-as-unibyte c) "")) str))

Certainly someone could already have an id "foo_5fbar", but the
table-based implementation already makes the assumption that all IDs will
be generated by it.

Davis

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