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;;; sx.el --- core functions -*- lexical-binding: t; -*-
;; Copyright (C) 2014 Sean Allred
;; Author: Sean Allred <code@seanallred.com>
;; This program 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.
;; 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This file defines basic commands used by all other parts of
;; StackMode.
;;; Code:
;;; Requirements
(defun sx-message (format-string &rest args)
"Display a message"
(message "[stack] %s" (apply #'format format-string args)))
(defun sx--thing-as-string (thing &optional sequence-sep)
"Return a string representation of THING. If THING is already
a string, just return it."
(cond
((stringp thing) thing)
((symbolp thing) (symbol-name thing))
((numberp thing) (number-to-string thing))
((sequencep thing)
(mapconcat #'sx--thing-as-string
thing (if sequence-sep sequence-sep ";")))))
(defun sx--filter-data (data desired-tree)
"Filters DATA and returns the DESIRED-TREE"
(if (vectorp data)
(apply #'vector
(mapcar (lambda (entry)
(sx--filter-data
entry desired-tree))
data))
(delq
nil
(mapcar (lambda (cons-cell)
;; TODO the resolution of `f' is O(2n) in the worst
;; case. It may be faster to implement the same
;; functionality as a `while' loop to stop looking the
;; list once it has found a match. Do speed tests.
;; See edfab4443ec3d376c31a38bef12d305838d3fa2e.
(let ((f (or (memq (car cons-cell) desired-tree)
(assoc (car cons-cell) desired-tree))))
(when f
(if (and (sequencep (cdr cons-cell))
(sequencep (elt (cdr cons-cell) 0)))
(cons (car cons-cell)
(sx-filter-data
(cdr cons-cell) (cdr f)))
cons-cell))))
data))))
(provide 'sx)
;;; sx.el ends here
;; Local Variables:
;; indent-tabs-mode: nil
;; End:
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