1 | ;;; broken.el --- Emacs broken facility infomation registry. |
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2 | |
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3 | ;; Copyright (C) 1998, 1999 Tanaka Akira <akr@jaist.ac.jp> |
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4 | |
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5 | ;; Author: Tanaka Akira <akr@jaist.ac.jp> |
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6 | ;; Keywords: emulation, compatibility, incompatibility, Mule |
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7 | |
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8 | ;; This file is part of APEL (A Portable Emacs Library). |
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9 | |
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10 | ;; This program is free software; you can redistribute it and/or |
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11 | ;; modify it under the terms of the GNU General Public License as |
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12 | ;; published by the Free Software Foundation; either version 2, or (at |
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13 | ;; your option) any later version. |
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14 | |
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15 | ;; This program is distributed in the hope that it will be useful, but |
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16 | ;; WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | ;; General Public License for more details. |
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19 | |
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20 | ;; You should have received a copy of the GNU General Public License |
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21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
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22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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23 | ;; Boston, MA 02111-1307, USA. |
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24 | |
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25 | ;;; Code: |
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26 | |
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27 | (require 'static) |
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28 | (require 'poe) |
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29 | |
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30 | (eval-and-compile |
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31 | |
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32 | (defvar notice-non-obvious-broken-facility t |
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33 | "If the value is t, non-obvious broken facility is noticed when |
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34 | `broken-facility' macro is expanded.") |
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35 | |
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36 | (defun broken-facility-internal (facility &optional docstring assertion) |
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37 | "Declare that FACILITY emulation is broken if ASSERTION is nil." |
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38 | (when docstring |
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39 | (put facility 'broken-docstring docstring)) |
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40 | (put facility 'broken (not assertion))) |
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41 | |
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42 | (defun broken-p (facility) |
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43 | "t if FACILITY emulation is broken." |
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44 | (get facility 'broken)) |
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45 | |
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46 | (defun broken-facility-description (facility) |
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47 | "Return description for FACILITY." |
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48 | (get facility 'broken-docstring)) |
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49 | |
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50 | ) |
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51 | |
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52 | (put 'broken-facility 'lisp-indent-function 1) |
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53 | (defmacro broken-facility (facility &optional docstring assertion no-notice) |
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54 | "Declare that FACILITY emulation is broken if ASSERTION is nil. |
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55 | ASSERTION is evaluated statically. |
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56 | |
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57 | FACILITY must be symbol. |
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58 | |
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59 | If ASSERTION is not ommited and evaluated to nil and NO-NOTICE is nil, |
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60 | it is noticed." |
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61 | (` (static-if (, assertion) |
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62 | (eval-and-compile |
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63 | (broken-facility-internal '(, facility) (, docstring) t)) |
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64 | (eval-when-compile |
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65 | (when (and '(, assertion) (not '(, no-notice)) |
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66 | notice-non-obvious-broken-facility) |
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67 | (message "BROKEN FACILITY DETECTED: %s" (, docstring))) |
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68 | nil) |
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69 | (eval-and-compile |
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70 | (broken-facility-internal '(, facility) (, docstring) nil))))) |
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71 | |
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72 | (put 'if-broken 'lisp-indent-function 2) |
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73 | (defmacro if-broken (facility then &rest else) |
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74 | "If FACILITY is broken, expand to THEN, otherwise (progn . ELSE)." |
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75 | (` (static-if (broken-p '(, facility)) |
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76 | (, then) |
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77 | (,@ else)))) |
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78 | |
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79 | |
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80 | (put 'when-broken 'lisp-indent-function 1) |
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81 | (defmacro when-broken (facility &rest body) |
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82 | "If FACILITY is broken, expand to (progn . BODY), otherwise nil." |
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83 | (` (static-when (broken-p '(, facility)) |
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84 | (,@ body)))) |
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85 | |
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86 | (put 'unless-broken 'lisp-indent-function 1) |
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87 | (defmacro unless-broken (facility &rest body) |
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88 | "If FACILITY is not broken, expand to (progn . BODY), otherwise nil." |
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89 | (` (static-unless (broken-p '(, facility)) |
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90 | (,@ body)))) |
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91 | |
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92 | (defmacro check-broken-facility (facility) |
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93 | "Check FACILITY is broken or not. If the status is different on |
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94 | compile(macro expansion) time and run time, warn it." |
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95 | (` (if-broken (, facility) |
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96 | (unless (broken-p '(, facility)) |
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97 | (message "COMPILE TIME ONLY BROKEN FACILITY DETECTED: %s" |
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98 | (or |
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99 | '(, (broken-facility-description facility)) |
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100 | (broken-facility-description '(, facility))))) |
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101 | (when (broken-p '(, facility)) |
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102 | (message "RUN TIME ONLY BROKEN FACILITY DETECTED: %s" |
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103 | (or |
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104 | (broken-facility-description '(, facility)) |
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105 | '(, (broken-facility-description facility)))))))) |
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106 | |
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107 | |
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108 | ;;; @ end |
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109 | ;;; |
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110 | |
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111 | (require 'product) |
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112 | (product-provide (provide 'broken) (require 'apel-ver)) |
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113 | |
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114 | ;;; broken.el ends here |
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