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;;; obarray.el --- obarray functions -*- lexical-binding: t -*-
;; Copyright (C) 2015-2016 Free Software Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: obarray functions
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This file provides function for working with obarrays.
;;; Code:
(defconst obarray-default-size 59
"The value 59 is an arbitrary prime number that gives a good hash.")
(defun obarray-make (&optional size)
"Return a new obarray of size SIZE or `obarray-default-size'."
(let ((size (or size obarray-default-size)))
(if (< 0 size)
(make-vector size 0)
(signal 'wrong-type-argument '(size 0)))))
(defun obarrayp (object)
"Return t if OBJECT is an obarray."
(and (vectorp object)
(< 0 (length object))))
;; Don’t use obarray as a variable name to avoid shadowing.
(defun obarray-get (ob name)
"Return symbol named NAME if it is contained in obarray OB.
Return nil otherwise."
(intern-soft name ob))
(defun obarray-put (ob name)
"Return symbol named NAME from obarray OB.
Creates and adds the symbol if doesn't exist."
(intern name ob))
(defun obarray-remove (ob name)
"Remove symbol named NAME if it is contained in obarray OB.
Return t on success, nil otherwise."
(unintern name ob))
(defun obarray-map (fn ob)
"Call function FN on every symbol in obarray OB and return nil."
(mapatoms fn ob))
(provide 'obarray)
;;; obarray.el ends here
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