mirror of https://codeberg.org/cage/tinmop/
46 lines
1.4 KiB
Common Lisp
46 lines
1.4 KiB
Common Lisp
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;; tinmop: an humble mastodon client
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;; Copyright (C) 2020 cage
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(in-package :stack)
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(defparameter *stack* (misc:make-array-frame 0))
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(defparameter *equal-function* #'equalp)
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(defparameter *key-function* #'identity)
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(defun push (val)
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(vector-push-extend val *stack*))
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(defun pop ()
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(if (not (emptyp))
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(prog1
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(alexandria:last-elt *stack*)
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(setf *stack* (misc:safe-delete@ *stack* (1- (length *stack*)))))
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nil))
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(defun find (element)
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(cl:find element *stack* :key *key-function* :test *equal-function*))
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(defun emptyp ()
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(not (> (length *stack*) 0)))
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(defmacro with-stack ((equal key) &body body)
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`(let ((*stack* (misc:make-array-frame 0))
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(*equal-function* ,equal)
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(*key-function* ,key))
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,@body))
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