#|
Copyright (C) 2008  David Owen <dsowen@fugue88.ws>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser Public License for more details.

You should have received a copy of the GNU Lesser Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
|#

(defpackage #:dso-simple-template-inst
  (:use #:cl)
  (:import-from #:dso-simple-template-env #:env-value)
  (:import-from #:dso-simple-template-templ #:body-text #:expression #:parts)
  (:export #:instantiate-template))

(in-package #:dso-simple-template-inst)



(defgeneric instantiate-template (template env &optional stream)
  (:method (template env &optional (stream *standard-output*))
    (dolist (part (parts template))
      (destructuring-bind (type . dat) part
        (ecase type
          (body-text
           (write-string dat stream))
          (expression
           (format stream "~A" (env-value env dat ""))))))))