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1 ;;; derived.el --- allow inheritance of major modes
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2 ;;; (formerly mode-clone.el)
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3
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4 ;; Copyright (C) 1993, 1994, 1999, 2003 Free Software Foundation, Inc.
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5
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6 ;; Author: David Megginson (dmeggins@aix1.uottawa.ca)
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7 ;; Maintainer: XEmacs Development Team
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8 ;; Keywords: extensions, dumped
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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25 ;; 02111-1307, USA.
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26
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27 ;;; Synched up with: FSF 21.3.
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28
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29 ;;; Commentary:
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30
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31 ;; This file is dumped with XEmacs.
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32
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613
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33 ;; XEmacs is already, in a sense, object oriented -- each object
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34 ;; (buffer) belongs to a class (major mode), and that class defines
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35 ;; the relationship between messages (input events) and methods
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36 ;; (commands) by means of a keymap.
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37 ;;
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38 ;; The only thing missing is a good scheme of inheritance. It is
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39 ;; possible to simulate a single level of inheritance with generous
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40 ;; use of hooks and a bit of work -- sgml-mode, for example, also runs
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41 ;; the hooks for text-mode, and keymaps can inherit from other keymaps
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42 ;; -- but generally, each major mode ends up reinventing the wheel.
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43 ;; Ideally, someone should redesign all of Emacs's major modes to
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44 ;; follow a more conventional object-oriented system: when defining a
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45 ;; new major mode, the user should need only to name the existing mode
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46 ;; it is most similar to, then list the (few) differences.
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47 ;;
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48 ;; In the mean time, this package offers most of the advantages of
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49 ;; full inheritance with the existing major modes. The macro
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50 ;; `define-derived-mode' allows the user to make a variant of an existing
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51 ;; major mode, with its own keymap. The new mode will inherit the key
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52 ;; bindings of its parent, and will, in fact, run its parent first
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53 ;; every time it is called. For example, the commands
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54 ;;
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55 ;; (define-derived-mode hypertext-mode text-mode "Hypertext"
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56 ;; "Major mode for hypertext.\n\n\\{hypertext-mode-map}"
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57 ;; (setq case-fold-search nil))
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58 ;;
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59 ;; (define-key hypertext-mode-map [down-mouse-3] 'do-hyper-link)
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60 ;;
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61 ;; will create a function `hypertext-mode' with its own (sparse)
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62 ;; keymap `hypertext-mode-map.' The command M-x hypertext-mode will
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63 ;; perform the following actions:
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64 ;;
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65 ;; - run the command (text-mode) to get its default setup
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66 ;; - replace the current keymap with 'hypertext-mode-map,' which will
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67 ;; inherit from 'text-mode-map'.
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68 ;; - replace the current syntax table with
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69 ;; 'hypertext-mode-syntax-table', which will borrow its defaults
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70 ;; from the current text-mode-syntax-table.
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71 ;; - replace the current abbrev table with
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72 ;; 'hypertext-mode-abbrev-table', which will borrow its defaults
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73 ;; from the current text-mode-abbrev table
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74 ;; - change the mode line to read "Hypertext"
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75 ;; - assign the value 'hypertext-mode' to the 'major-mode' variable
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76 ;; - run the body of commands provided in the macro -- in this case,
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77 ;; set the local variable `case-fold-search' to nil.
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78 ;;
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79 ;; The advantages of this system are threefold. First, text mode is
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80 ;; untouched -- if you had added the new keystroke to `text-mode-map,'
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81 ;; possibly using hooks, you would have added it to all text buffers
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82 ;; -- here, it appears only in hypertext buffers, where it makes
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83 ;; sense. Second, it is possible to build even further, and make
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84 ;; a derived mode from a derived mode. The commands
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85 ;;
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86 ;; (define-derived-mode html-mode hypertext-mode "HTML")
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87 ;; [various key definitions]
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88 ;;
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89 ;; will add a new major mode for HTML with very little fuss.
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90 ;;
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91 ;; Note also the function `derived-mode-p' which can tell if the current
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92 ;; mode derives from another. In a hypertext-mode, buffer, for example,
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93 ;; (derived-mode-p 'text-mode) would return non-nil. This should always
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94 ;; be used in place of (eq major-mode 'text-mode).
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95
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96 ;;; Code:
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97
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98 ;;; PRIVATE: defsubst must be defined before they are first used
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99
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100 (defsubst derived-mode-hook-name (mode)
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101 "Construct the mode hook name based on mode name MODE."
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102 (intern (concat (symbol-name mode) "-hook")))
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103
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104 (defsubst derived-mode-map-name (mode)
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105 "Construct a map name based on a MODE name."
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106 (intern (concat (symbol-name mode) "-map")))
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107
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108 (defsubst derived-mode-syntax-table-name (mode)
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109 "Construct a syntax-table name based on a MODE name."
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110 (intern (concat (symbol-name mode) "-syntax-table")))
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111
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112 (defsubst derived-mode-abbrev-table-name (mode)
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113 "Construct an abbrev-table name based on a MODE name."
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114 (intern (concat (symbol-name mode) "-abbrev-table")))
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115
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116 ;; PUBLIC: define a new major mode which inherits from an existing one.
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117
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118 ;; XEmacs -- no autoload
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119 (defmacro define-derived-mode (child parent name &optional docstring &rest body)
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120 "Create a new mode as a variant of an existing mode.
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121
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122 The arguments to this command are as follow:
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123
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124 CHILD: the name of the command for the derived mode.
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125 PARENT: the name of the command for the parent mode (e.g. `text-mode')
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126 or nil if there is no parent.
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127 NAME: a string which will appear in the status line (e.g. \"Hypertext\")
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128 DOCSTRING: an optional documentation string--if you do not supply one,
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129 the function will attempt to invent something useful.
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130 BODY: forms to execute just before running the
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131 hooks for the new mode. Do not use `interactive' here.
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132
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133 BODY can start with a bunch of keyword arguments. The following keyword
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134 arguments are currently understood:
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135 :group GROUP
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136 Declare the customization group that corresponds to this mode.
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137 :syntax-table TABLE
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138 Use TABLE instead of the default.
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139 A nil value means to simply use the same syntax-table as the parent.
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140 :abbrev-table TABLE
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141 Use TABLE instead of the default.
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142 A nil value means to simply use the same abbrev-table as the parent.
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143
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144 Here is how you could define LaTeX-Thesis mode as a variant of LaTeX mode:
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145
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146 (define-derived-mode LaTeX-thesis-mode LaTeX-mode \"LaTeX-Thesis\")
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147
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148 You could then make new key bindings for `LaTeX-thesis-mode-map'
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149 without changing regular LaTeX mode. In this example, BODY is empty,
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150 and DOCSTRING is generated by default.
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151
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152 On a more complicated level, the following command uses `sgml-mode' as
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153 the parent, and then sets the variable `case-fold-search' to nil:
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154
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155 (define-derived-mode article-mode sgml-mode \"Article\"
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156 \"Major mode for editing technical articles.\"
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157 (setq case-fold-search nil))
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158
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159 Note that if the documentation string had been left out, it would have
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160 been generated automatically, with a reference to the keymap.
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161
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162 The new mode runs the hook constructed by the function
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163 `derived-mode-hook-name'."
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164 (declare (debug (&define name symbolp sexp [&optional stringp]
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165 [&rest keywordp sexp] def-body)))
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166
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167 (when (and docstring (not (stringp docstring)))
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168 ;; Some trickiness, since what appears to be the docstring may really be
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169 ;; the first element of the body.
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170 (push docstring body)
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171 (setq docstring nil))
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172
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173 (when (eq parent 'fundamental-mode) (setq parent nil))
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174
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175 (let ((map (derived-mode-map-name child))
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176 (syntax (derived-mode-syntax-table-name child))
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177 (abbrev (derived-mode-abbrev-table-name child))
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178 (declare-abbrev t)
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179 (declare-syntax t)
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180 (hook (derived-mode-hook-name child))
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181 (group nil))
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182
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183 ;; Process the keyword args.
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184 (while (keywordp (car body))
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185 (case (pop body)
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186 (:group (setq group (pop body)))
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187 (:abbrev-table (setq abbrev (pop body)) (setq declare-abbrev nil))
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188 (:syntax-table (setq syntax (pop body)) (setq declare-syntax nil))
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189 (t (pop body))))
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190
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191 (setq docstring (derived-mode-make-docstring
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192 parent child docstring syntax abbrev))
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193
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194 `(progn
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195 (defvar ,hook nil ,(format "Hook run when entering %s mode." name))
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196 (defvar ,map (make-sparse-keymap))
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197 ,(if declare-syntax
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198 `(defvar ,syntax (make-syntax-table)))
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199 ,(if declare-abbrev
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200 `(defvar ,abbrev
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201 (progn (define-abbrev-table ',abbrev nil) ,abbrev)))
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202 (put ',child 'derived-mode-parent ',parent)
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203 ,(if group `(put ',child 'custom-mode-group ,group))
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204
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205 (defun ,child ()
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206 ,docstring
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207 (interactive)
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208 ; Run the parent.
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209 (delay-mode-hooks
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210
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211 (,(or parent 'kill-all-local-variables))
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212 ; Identify the child mode.
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213 (setq major-mode (quote ,child))
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214 (setq mode-name ,name)
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215 ; Identify special modes.
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216 ,(when parent
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217 `(progn
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218 (if (get (quote ,parent) 'mode-class)
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219 (put (quote ,child) 'mode-class
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220 (get (quote ,parent) 'mode-class)))
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221 ; Set up maps and tables.
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222 (unless (keymap-parent ,map)
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223 (set-keymap-parents ,map (list (current-local-map))))
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224 ,(when declare-syntax
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225 ;; XEmacs change: we do not have char-table-parent
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226 `(derived-mode-merge-syntax-tables
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227 ,syntax (syntax-table)))))
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228
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229 (use-local-map ,map)
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230 ,(when syntax `(set-syntax-table ,syntax))
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231 ,(when abbrev `(setq local-abbrev-table ,abbrev))
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232 ; Splice in the body (if any).
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233 ,@body
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234 )
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235 ;; Run the hooks, if any.
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236 ;; Make the generated code work in older Emacs versions
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237 ;; that do not yet have run-mode-hooks.
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238 (if (fboundp 'run-mode-hooks)
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239 (run-mode-hooks ',hook)
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240 (run-hooks ',hook))))))
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428
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241
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242 ;; PUBLIC: find the ultimate class of a derived mode.
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243
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244 (defun derived-mode-class (mode)
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245 "Find the class of a major MODE.
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246 A mode's class is the first ancestor which is NOT a derived mode.
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247 Use the `derived-mode-parent' property of the symbol to trace backwards.
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248 Since major-modes might all derive from `fundamental-mode', this function
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249 is not very useful."
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250 (while (get mode 'derived-mode-parent)
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251 (setq mode (get mode 'derived-mode-parent)))
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252 mode)
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253 (make-obsolete 'derived-mode-class 'derived-mode-p)
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254
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255 ;; PUBLIC: find if the current mode derives from another.
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256 ;; from GNU Emacs 21 subr.el
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257
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258 (defun derived-mode-p (&rest modes)
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259 "Non-nil if the current major mode is derived from one of MODES.
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260 Uses the `derived-mode-parent' property of the symbol to trace backwards."
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261 (let ((parent major-mode))
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262 (while (and (not (memq parent modes))
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263 (setq parent (get parent 'derived-mode-parent))))
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264 parent))
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265
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266
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267 ;;; PRIVATE
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268
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269 (defun derived-mode-make-docstring (parent child &optional
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270 docstring syntax abbrev)
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271 "Construct a docstring for a new mode if none is provided."
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272
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273 (let ((map (derived-mode-map-name child))
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274 (hook (derived-mode-hook-name child)))
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275
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276 (unless (stringp docstring)
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277 ;; Use a default docstring.
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278 (setq docstring
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279 (if (null parent)
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280 (format "Major-mode.
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281 Uses keymap `%s', abbrev table `%s' and syntax-table `%s'." map abbrev syntax)
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282 (format "Major mode derived from `%s' by `define-derived-mode'.
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283 It inherits all of the parent's attributes, but has its own keymap,
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284 abbrev table and syntax table:
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285
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286 `%s', `%s' and `%s'
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287
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288 which more-or-less shadow %s's corresponding tables."
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289 parent map abbrev syntax parent))))
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290
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291 (unless (string-match (regexp-quote (symbol-name hook)) docstring)
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292 ;; Make sure the docstring mentions the mode's hook.
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293 (setq docstring
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294 (concat docstring
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295 (if (null parent)
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296 "\n\nThis mode "
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297 (concat
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298 "\n\nIn addition to any hooks its parent mode "
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299 (if (string-match (regexp-quote (format "`%s'" parent))
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300 docstring) nil
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301 (format "`%s' " parent))
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302 "might have run,\nthis mode "))
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303 (format "runs the hook `%s'" hook)
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304 ", as the final step\nduring initialization.")))
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305
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306 (unless (string-match "\\\\[{[]" docstring)
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307 ;; And don't forget to put the mode's keymap.
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308 (setq docstring (concat docstring "\n\n\\{" (symbol-name map) "}")))
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309
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310 docstring))
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311
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312
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313 ;;; OBSOLETE
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314 ;; The functions below are only provided for backward compatibility with
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315 ;; code byte-compiled with versions of derived.el prior to Emacs-21.
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316
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317 (defsubst derived-mode-setup-function-name (mode)
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2135
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318 "Construct a setup-function name based on a MODE name."
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428
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319 (intern (concat (symbol-name mode) "-setup")))
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320
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321
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322 ;; Utility functions for defining a derived mode.
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323
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324 ;; XEmacs -- don't autoload
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325 (defun derived-mode-init-mode-variables (mode)
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326 "Initialise variables for a new MODE.
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327 Right now, if they don't already exist, set up a blank keymap, an
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328 empty syntax table, and an empty abbrev table -- these will be merged
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329 the first time the mode is used."
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330
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331 (if (boundp (derived-mode-map-name mode))
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332 t
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333 (eval `(defvar ,(derived-mode-map-name mode)
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334 ;; XEmacs change
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335 (make-sparse-keymap (derived-mode-map-name mode))
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336 ,(format "Keymap for %s." mode)))
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337 (put (derived-mode-map-name mode) 'derived-mode-unmerged t))
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338
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339 (if (boundp (derived-mode-syntax-table-name mode))
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340 t
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341 (eval `(defvar ,(derived-mode-syntax-table-name mode)
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342 ;; XEmacs change
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343 ;; Make a syntax table which doesn't specify anything
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344 ;; for any char. Valid data will be merged in by
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345 ;; derived-mode-merge-syntax-tables.
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346 ;; (make-char-table 'syntax-table nil)
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347 (make-syntax-table)
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348 ,(format "Syntax table for %s." mode)))
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349 (put (derived-mode-syntax-table-name mode) 'derived-mode-unmerged t))
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350
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351 (if (boundp (derived-mode-abbrev-table-name mode))
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352 t
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353 (eval `(defvar ,(derived-mode-abbrev-table-name mode)
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2135
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354 (progn
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355 (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
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356 (make-abbrev-table))
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428
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357 ,(format "Abbrev table for %s." mode)))))
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358
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359 ;; Utility functions for running a derived mode.
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360
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361 (defun derived-mode-set-keymap (mode)
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2135
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362 "Set the keymap of the new MODE, maybe merging with the parent."
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428
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363 (let* ((map-name (derived-mode-map-name mode))
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364 (new-map (eval map-name))
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365 (old-map (current-local-map)))
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366 (and old-map
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367 (get map-name 'derived-mode-unmerged)
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368 (derived-mode-merge-keymaps old-map new-map))
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369 (put map-name 'derived-mode-unmerged nil)
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370 (use-local-map new-map)))
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371
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2135
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372 (defun derived-mode-set-syntax-table (mode)
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373 "Set the syntax table of the new MODE, maybe merging with the parent."
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428
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374 (let* ((table-name (derived-mode-syntax-table-name mode))
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375 (old-table (syntax-table))
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376 (new-table (eval table-name)))
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377 (if (get table-name 'derived-mode-unmerged)
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378 (derived-mode-merge-syntax-tables old-table new-table))
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379 (put table-name 'derived-mode-unmerged nil)
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380 (set-syntax-table new-table)))
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381
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382 (defun derived-mode-set-abbrev-table (mode)
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2135
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383 "Set the abbrev table for MODE if it exists.
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428
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384 Always merge its parent into it, since the merge is non-destructive."
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385 (let* ((table-name (derived-mode-abbrev-table-name mode))
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386 (old-table local-abbrev-table)
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387 (new-table (eval table-name)))
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388 (derived-mode-merge-abbrev-tables old-table new-table)
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389 (setq local-abbrev-table new-table)))
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390
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391 ;;;(defun derived-mode-run-setup-function (mode)
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392 ;;; "Run the setup function if it exists."
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393
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394 ;;; (let ((fname (derived-mode-setup-function-name mode)))
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395 ;;; (if (fboundp fname)
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396 ;;; (funcall fname))))
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397
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398 (defun derived-mode-run-hooks (mode)
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2135
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399 "Run the mode hook for MODE."
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400 (let ((hooks-name (derived-mode-hook-name mode)))
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428
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401 (if (boundp hooks-name)
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402 (run-hooks hooks-name))))
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403
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404 ;; Functions to merge maps and tables.
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405
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406 (defun derived-mode-merge-keymaps (old new)
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2135
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407 "Merge an OLD keymap into a NEW one.
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408 The old keymap is set to be the last cdr of the new one, so that there will
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428
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409 be automatic inheritance."
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2135
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410 ;; XEmacs change. FSF 19.30 to 21.3 has a whole bunch of weird crap here
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428
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411 ;; for merging prefix keys and such. Hopefully none of this is
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412 ;; necessary in XEmacs.
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413 (set-keymap-parents new (list old)))
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414
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415 (defun derived-mode-merge-syntax-tables (old new)
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2135
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416 "Merge an OLD syntax table into a NEW one.
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428
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417 Where the new table already has an entry, nothing is copied from the old one."
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2135
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418 ;; XEmacs change: on the other hand, Emacs 21.3 just has
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419 ;; (set-char-table-parent new old) here.
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420 ;; We use map-char-table, not map-syntax-table, so we can explicitly
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421 ;; check for inheritance.
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422 (map-char-table
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423 #'(lambda (key value)
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424 (let ((newval (get-range-char-table key new 'multi)))
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425 (cond ((eq newval 'multi) ; OK, dive into the class hierarchy
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426 (map-char-table
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427 #'(lambda (key1 value1)
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428 (when (eq ?@ (char-syntax-from-code
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429 (get-range-char-table key new ?@)))
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430 (put-char-table key1 value new))
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431 nil)
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432 new
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433 key))
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434 ((eq ?@ (char-syntax-from-code newval)) ;; class at once
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435 (put-char-table key value new))))
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436 nil)
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437 old))
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428
|
438
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439 ;; Merge an old abbrev table into a new one.
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440 ;; This function requires internal knowledge of how abbrev tables work,
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441 ;; presuming that they are obarrays with the abbrev as the symbol, the expansion
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442 ;; as the value of the symbol, and the hook as the function definition.
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443 (defun derived-mode-merge-abbrev-tables (old new)
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444 (if old
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2135
|
445 (mapatoms
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446 #'(lambda (symbol)
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447 (or (intern-soft (symbol-name symbol) new)
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448 (define-abbrev new (symbol-name symbol)
|
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449 (symbol-value symbol) (symbol-function symbol))))
|
|
428
|
450 old)))
|
|
2135
|
451
|
|
428
|
452 (provide 'derived)
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453
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2135
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454 ;;; arch-tag: 630be248-47d1-4f02-afa0-8207de0ebea0
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428
|
455 ;;; derived.el ends here
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