115 lines
3.8 KiB
EmacsLisp
115 lines
3.8 KiB
EmacsLisp
;;; broken.el --- Emacs broken facility information registry.
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;; Copyright (C) 1998, 1999 Tanaka Akira <akr@jaist.ac.jp>
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;; Author: Tanaka Akira <akr@jaist.ac.jp>
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;; Keywords: emulation, compatibility, incompatibility, Mule
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;; This file is part of APEL (A Portable Emacs Library).
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2, or (at
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;; your option) any later version.
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;; This program is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Code:
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(require 'static)
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(require 'poe)
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(eval-and-compile
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(defvar notice-non-obvious-broken-facility t
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"If the value is t, non-obvious broken facility is noticed when
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`broken-facility' macro is expanded.")
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(defun broken-facility-internal (facility &optional docstring assertion)
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"Declare that FACILITY emulation is broken if ASSERTION is nil."
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(when docstring
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(put facility 'broken-docstring docstring))
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(put facility 'broken (not assertion)))
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(defun broken-p (facility)
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"t if FACILITY emulation is broken."
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(get facility 'broken))
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(defun broken-facility-description (facility)
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"Return description for FACILITY."
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(get facility 'broken-docstring))
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)
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(put 'broken-facility 'lisp-indent-function 1)
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(defmacro broken-facility (facility &optional docstring assertion no-notice)
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"Declare that FACILITY emulation is broken if ASSERTION is nil.
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ASSERTION is evaluated statically.
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FACILITY must be symbol.
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If ASSERTION is not omitted and evaluated to nil and NO-NOTICE is nil,
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it is noticed."
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(` (static-if (, assertion)
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(eval-and-compile
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(broken-facility-internal '(, facility) (, docstring) t))
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(eval-when-compile
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(when (and '(, assertion) (not '(, no-notice))
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notice-non-obvious-broken-facility)
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(message "BROKEN FACILITY DETECTED: %s" (, docstring)))
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nil)
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(eval-and-compile
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(broken-facility-internal '(, facility) (, docstring) nil)))))
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(put 'if-broken 'lisp-indent-function 2)
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(defmacro if-broken (facility then &rest else)
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"If FACILITY is broken, expand to THEN, otherwise (progn . ELSE)."
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(` (static-if (broken-p '(, facility))
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(, then)
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(,@ else))))
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(put 'when-broken 'lisp-indent-function 1)
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(defmacro when-broken (facility &rest body)
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"If FACILITY is broken, expand to (progn . BODY), otherwise nil."
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(` (static-when (broken-p '(, facility))
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(,@ body))))
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(put 'unless-broken 'lisp-indent-function 1)
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(defmacro unless-broken (facility &rest body)
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"If FACILITY is not broken, expand to (progn . BODY), otherwise nil."
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(` (static-unless (broken-p '(, facility))
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(,@ body))))
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(defmacro check-broken-facility (facility)
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"Check FACILITY is broken or not. If the status is different on
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compile(macro expansion) time and run time, warn it."
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(` (if-broken (, facility)
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(unless (broken-p '(, facility))
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(message "COMPILE TIME ONLY BROKEN FACILITY DETECTED: %s"
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(or
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'(, (broken-facility-description facility))
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(broken-facility-description '(, facility)))))
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(when (broken-p '(, facility))
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(message "RUN TIME ONLY BROKEN FACILITY DETECTED: %s"
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(or
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(broken-facility-description '(, facility))
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'(, (broken-facility-description facility))))))))
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;;; @ end
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;;;
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(require 'product)
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(product-provide (provide 'broken) (require 'apel-ver))
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;;; broken.el ends here
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