source: main/env.lisp

#|
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-env
  (:use #:cl)
  (:export #:env #:env-value))

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



(defclass env ()
  ((table :type hash-table :initform (make-hash-table :test 'equal)
          :reader table)))

(defgeneric env-value (env name &optional default)
  (:method ((env env) name &optional default)
    (gethash name (table env) default)))

(defgeneric (setf env-value) (value env name)
  (:method (value (env env) name)
    (setf (gethash name (table env)) value)))