test/automated/lexbind-tests.el

   1 ;;; lexbind-tests.el --- Testing the lexbind byte-compiler
   2
   3 ;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
   4
   5 ;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
   6 ;; Keywords:
   7
   8 ;; This program is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; This program is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;;
  24
  25 ;;; Code:
  26
  27 (require 'ert)
  28
  29 (defconst lexbind-tests
  30   `(
  31     (let ((f #'car))
  32       (let ((f (lambda (x) (cons (funcall f x) (cdr x)))))
  33         (funcall f '(1 . 2))))
  34     )
  35   "List of expression for test.
  36 Each element will be executed by interpreter and with
  37 bytecompiled code, and their results compared.")
  38
  39
  40
  41 (defun lexbind-check-1 (pat)
  42   "Return non-nil if PAT is the same whether directly evalled or compiled."
  43   (let ((warning-minimum-log-level :emergency)
  44         (byte-compile-warnings nil)
  45         (v0 (condition-case nil
  46                 (eval pat t)
  47               (error nil)))
  48         (v1 (condition-case nil
  49                 (funcall (let ((lexical-binding t))
  50                            (byte-compile `(lambda nil ,pat))))
  51               (error nil))))
  52     (equal v0 v1)))
  53
  54 (put 'lexbind-check-1 'ert-explainer 'lexbind-explain-1)
  55
  56 (defun lexbind-explain-1 (pat)
  57   (let ((v0 (condition-case nil
  58                 (eval pat t)
  59               (error nil)))
  60         (v1 (condition-case nil
  61                 (funcall (let ((lexical-binding t))
  62                            (byte-compile (list 'lambda nil pat))))
  63               (error nil))))
  64     (format "Expression `%s' gives `%s' if directly evalled, `%s' if compiled."
  65             pat v0 v1)))
  66
  67 (ert-deftest lexbind-tests ()
  68   "Test the Emacs byte compiler lexbind handling."
  69   (dolist (pat lexbind-tests)
  70     (should (lexbind-check-1 pat))))
  71
  72
  73
  74 (provide 'lexbind-tests)
  75 ;;; lexbind-tests.el ends here