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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: HTML-TEMPLATE; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/html-template/api.lisp,v 1.22 2007-03-09 13:09:16 edi Exp $
;;; Copyright (c) 2003-2007, Dr. Edmund Weitz. All rights reserved.
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(in-package #:html-template)
(defgeneric create-template-printer (template
&key force
element-type
if-does-not-exist
external-format)
(:documentation "Creates a template printer from TEMPLATE which is
an open input stream, a string, or a pathname. If FORCE is true a
printer will be newly created no matter what the state of the cache
is. If FORCE is :DO-NOT-CACHE the newly created printer won't be
cached. Other keyword arguments will be given to WITH-OPEN-FILE.
Keyword arguments will only be accepted if TEMPLATE is a PATHNAME."))
(defmethod create-template-printer ((input-stream stream) &rest rest)
(when rest
(signal-template-invocation-error
"This method doesn't accept keyword arguments"))
(let ((*standard-input* input-stream))
(%create-template-printer-aux nil nil)))
(defmethod create-template-printer ((string string) &rest rest)
(when rest
(signal-template-invocation-error
"This method doesn't accept keyword arguments"))
(with-input-from-string (*standard-input* string)
(%create-template-printer-aux nil nil)))
(defmethod create-template-printer ((pathname pathname)
&key (force *force-default*)
(element-type #-:lispworks 'character
#+:lispworks 'lw:simple-char)
(if-does-not-exist :error)
(external-format *external-format*))
(let* ((merged-pathname (merge-pathnames pathname
*default-template-pathname*))
(file-write-date (or *no-cache-check*
(file-write-date merged-pathname))))
(destructuring-bind (hashed-printer . creation-date)
;; see if a printer for this pathname is in the cache
(or (gethash merged-pathname *printer-hash*)
'(nil . nil))
(when (and hashed-printer
;; and if we may use it
(not force)
;; and if it's not too old (or maybe we don't have to
;; check)
(or *no-cache-check*
(and file-write-date
(<= file-write-date creation-date))))
(return-from create-template-printer hashed-printer))
(let ((new-printer
;; push this pathname onto stack of included files (so
;; to say) to make sure a file can't include itself
;; recursively
(let ((*included-files* (cons merged-pathname
*included-files*))
(*external-format* external-format))
(with-open-file (*standard-input* merged-pathname
:direction :input
:if-does-not-exist if-does-not-exist
:element-type element-type
:external-format external-format)
(%create-template-printer-aux nil nil)))))
;; cache newly created printer (together with current time)
(unless (eq force :do-not-cache)
(setf (gethash merged-pathname *printer-hash*)
(cons new-printer (get-universal-time))))
;; optionally issue a warning
(when *warn-on-creation*
(warn "New template printer for ~S created" merged-pathname))
new-printer))))
(defgeneric fill-and-print-template (template/printer values
&key stream
&allow-other-keys)
(:documentation "Fills the template denoted by TEMPLATE/PRINTER with
VALUES and print it to STREAM. If TEMPLATE/PRINTER is a function uses
it as if it were a template printer, otherwise creates a printer \(or
pull one out of the cache) with CREATE-TEMPLATE-PRINTER. Optional
keyword arguments are given to CREATE-TEMPLATE printer and can only be
used if TEMPLATE/PRINTER is a pathname."))
(defmethod fill-and-print-template ((function function) values
&rest rest
&key (stream *default-template-output*))
(remf rest :stream)
(when rest
(signal-template-invocation-error
"This method doesn't accept keyword arguments other than STREAM"))
(let ((*template-output* stream))
(funcall function values)))
(defmethod fill-and-print-template ((string string) values
&rest rest
&key (stream *default-template-output*))
(remf rest :stream)
(when rest
(signal-template-invocation-error
"This method doesn't accept keyword arguments other than STREAM"))
(let ((*template-output* stream))
(funcall (create-template-printer string) values)))
(defmethod fill-and-print-template ((input-stream stream) values
&rest rest
&key (stream *default-template-output*))
(remf rest :stream)
(when rest
(signal-template-invocation-error
"This method doesn't accept keyword arguments other than STREAM"))
(let ((*template-output* stream))
(funcall (create-template-printer input-stream) values)))
(defmethod fill-and-print-template ((pathname pathname) values
&rest rest
&key (stream *default-template-output*))
(remf rest :stream)
(let ((*template-output* stream))
(funcall (apply #'create-template-printer pathname rest) values)))
(defun clear-template-cache ()
"Complete clears all template printers from the cache."
(clrhash *printer-hash*)
(values))
(defun delete-from-template-cache (pathname)
"Deletes the template printer denoted by PATHNAME from the
cache. Returns true if such a printer existed, false otherwise."
(remhash (merge-pathnames pathname
*default-template-pathname*)
*printer-hash*))
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