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71 lines
2.1 KiB
EmacsLisp
71 lines
2.1 KiB
EmacsLisp
;;; obarray.el --- obarray functions -*- lexical-binding: t -*-
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;; Copyright (C) 2015-2021 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: obarray functions
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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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;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file provides function for working with obarrays.
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;;; Code:
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(defconst obarray-default-size 59
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"The value 59 is an arbitrary prime number that gives a good hash.")
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(defun obarray-make (&optional size)
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"Return a new obarray of size SIZE or `obarray-default-size'."
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(let ((size (or size obarray-default-size)))
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(if (< 0 size)
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(make-vector size 0)
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(signal 'wrong-type-argument '(size 0)))))
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(defun obarray-size (ob)
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"Return the number of slots of obarray OB."
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(length ob))
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(defun obarrayp (object)
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"Return t if OBJECT is an obarray."
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(and (vectorp object)
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(< 0 (length object))))
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;; Don’t use obarray as a variable name to avoid shadowing.
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(defun obarray-get (ob name)
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"Return symbol named NAME if it is contained in obarray OB.
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Return nil otherwise."
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(intern-soft name ob))
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(defun obarray-put (ob name)
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"Return symbol named NAME from obarray OB.
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Creates and adds the symbol if doesn't exist."
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(intern name ob))
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(defun obarray-remove (ob name)
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"Remove symbol named NAME if it is contained in obarray OB.
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Return t on success, nil otherwise."
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(unintern name ob))
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(defun obarray-map (fn ob)
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"Call function FN on every symbol in obarray OB and return nil."
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(mapatoms fn ob))
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(provide 'obarray)
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;;; obarray.el ends here
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