This page gives information about useful utilities included in CL-HTTP, for performing translations and other operations frequently needed when programming web sites.
Escaping and unescaping strings for URLs
string-escape-special-chars (string &optional start end)
Escapes characters illegal in URLs using %xx notation. For example:
(string-escape-special-chars "Contact http://www.google.com/") "Contact%20http%3A%2F%2Fwww.google.com%2F" T
The second value returned indicates if any characters were escaped.
write-string-escaping-special-chars (string &optional stream start end))
As string-escape-special-chars, but writes the escaped string to a stream.
string-unescape-special-chars (string &optional start end)
Unescapes characters encoded with percent encoding. For example:
(string-unescape-special-chars "Contact%20http%3A%2F%2Fwww.google.com%2F") "Contact http://www.google.com/" T T
The second value returned indicates if any characters were unescaped, and the third value indicates if a new string was returned.
Escaping and unescaping strings for HTML
write-string-quoting-specials (string &optional stream start end)
Writes a string to the stream, encoding the four special characters disallowed in HTML:
(write-string-quoting-specials "Write <p> </p>" *standard-output*) Write <p>&nbsp;</p> NIL
Encoding and decoding LISP forms
Encodes a LISP form as a base64-encoded string that can be included in a URL or as the value of a form field. For example:
(write-to-armor-plated-string '(ant bee cat dog)) "KEFOVCBCRUUgQ0FUIERPRyk*"
Encodes a base64-encoded string back into a LISP form. For example:
(read-from-armor-plated-string "KEFOVCBCRUUgQ0FUIERPRyk*") (ANT BEE CAT DOG) 17
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