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1 ;;; cc-defs.el --- definitions for CC Mode
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2
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3 ;; Copyright (C) 1985,87,92,93,94,95,96,97 Free Software Foundation, Inc.
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4
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5 ;; Authors: 1992-1997 Barry A. Warsaw
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6 ;; 1987 Dave Detlefs and Stewart Clamen
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7 ;; 1985 Richard M. Stallman
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8 ;; Maintainer: cc-mode-help@python.org
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9 ;; Created: 22-Apr-1997 (split from cc-mode.el)
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181
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10 ;; Version: 5.15
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171
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11 ;; Keywords: c languages oop
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12
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13 ;; This file is part of GNU Emacs.
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14
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15 ;; GNU Emacs is free software; you can redistribute it and/or modify
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16 ;; it under the terms of the GNU General Public License as published by
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17 ;; the Free Software Foundation; either version 2, or (at your option)
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18 ;; any later version.
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19
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20 ;; GNU Emacs is distributed in the hope that it will be useful,
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21 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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22 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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23 ;; GNU General Public License for more details.
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24
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25 ;; You should have received a copy of the GNU General Public License
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26 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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27 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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28 ;; Boston, MA 02111-1307, USA.
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29
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30
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31 ;; Figure out what features this Emacs has
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32 (defconst c-emacs-features
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33 (let ((infodock-p (boundp 'infodock-version))
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34 (comments
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35 ;; XEmacs 19 and beyond use 8-bit modify-syntax-entry flags.
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36 ;; Emacs 19 uses a 1-bit flag. We will have to set up our
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37 ;; syntax tables differently to handle this.
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38 (let ((table (copy-syntax-table))
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39 entry)
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40 (modify-syntax-entry ?a ". 12345678" table)
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41 (cond
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42 ;; XEmacs 19, and beyond Emacs 19.34
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43 ((arrayp table)
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44 (setq entry (aref table ?a))
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45 ;; In Emacs, table entries are cons cells
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46 (if (consp entry) (setq entry (car entry))))
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47 ;; XEmacs 20
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48 ((fboundp 'get-char-table) (setq entry (get-char-table ?a table)))
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49 ;; before and including Emacs 19.34
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50 ((and (fboundp 'char-table-p)
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51 (char-table-p table))
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52 (setq entry (car (char-table-range table [?a]))))
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53 ;; incompatible
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54 (t (error "CC Mode is incompatible with this version of Emacs")))
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55 (if (= (logand (lsh entry -16) 255) 255)
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56 '8-bit
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57 '1-bit))))
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58 (if infodock-p
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59 (list comments 'infodock)
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60 (list comments)))
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61 "A list of features extant in the Emacs you are using.
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62 There are many flavors of Emacs out there, each with different
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63 features supporting those needed by CC Mode. Here's the current
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64 supported list, along with the values for this variable:
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65
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66 XEmacs 19: (8-bit)
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67 XEmacs 20: (8-bit)
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68 Emacs 19: (1-bit)
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69
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70 Infodock (based on XEmacs) has an additional symbol on this list:
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71 'infodock.")
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72
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73
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74
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75 (defsubst c-point (position)
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76 ;; Returns the value of point at certain commonly referenced POSITIONs.
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77 ;; POSITION can be one of the following symbols:
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78 ;;
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79 ;; bol -- beginning of line
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80 ;; eol -- end of line
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81 ;; bod -- beginning of defun
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82 ;; boi -- back to indentation
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83 ;; ionl -- indentation of next line
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84 ;; iopl -- indentation of previous line
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85 ;; bonl -- beginning of next line
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86 ;; bopl -- beginning of previous line
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87 ;;
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88 ;; This function does not modify point or mark.
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89 (let ((here (point)))
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90 (cond
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91 ((eq position 'bol) (beginning-of-line))
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92 ((eq position 'eol) (end-of-line))
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93 ((eq position 'bod)
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94 (beginning-of-defun)
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95 ;; if defun-prompt-regexp is non-nil, b-o-d won't leave us at
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96 ;; the open brace.
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97 (and defun-prompt-regexp
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98 (looking-at defun-prompt-regexp)
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99 (goto-char (match-end 0)))
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100 )
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101 ((eq position 'boi) (back-to-indentation))
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102 ((eq position 'bonl) (forward-line 1))
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103 ((eq position 'bopl) (forward-line -1))
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104 ((eq position 'iopl)
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105 (forward-line -1)
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106 (back-to-indentation))
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107 ((eq position 'ionl)
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108 (forward-line 1)
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109 (back-to-indentation))
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110 (t (error "unknown buffer position requested: %s" position))
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111 )
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112 (prog1
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113 (point)
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114 (goto-char here))))
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115
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116 (defmacro c-safe (&rest body)
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117 ;; safely execute BODY, return nil if an error occurred
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118 (` (condition-case nil
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119 (progn (,@ body))
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120 (error nil))))
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121
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122 (defmacro c-add-syntax (symbol &optional relpos)
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123 ;; a simple macro to append the syntax in symbol to the syntax list.
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124 ;; try to increase performance by using this macro
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125 (` (setq syntax (cons (cons (, symbol) (, relpos)) syntax))))
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126
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127 (defsubst c-auto-newline ()
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128 ;; if auto-newline feature is turned on, insert a newline character
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129 ;; and return t, otherwise return nil.
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130 (and c-auto-newline
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131 (not (c-in-literal))
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132 (not (newline))))
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133
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134 (defsubst c-intersect-lists (list alist)
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135 ;; return the element of ALIST that matches the first element found
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136 ;; in LIST. Uses assq.
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137 (let (match)
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138 (while (and list
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139 (not (setq match (assq (car list) alist))))
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140 (setq list (cdr list)))
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141 match))
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142
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143 (defsubst c-lookup-lists (list alist1 alist2)
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144 ;; first, find the first entry from LIST that is present in ALIST1,
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145 ;; then find the entry in ALIST2 for that entry.
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146 (assq (car (c-intersect-lists list alist1)) alist2))
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147
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148 (defsubst c-langelem-col (langelem &optional preserve-point)
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149 ;; convenience routine to return the column of langelem's relpos.
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150 ;; Leaves point at the relpos unless preserve-point is non-nil.
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151 (let ((here (point)))
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152 (goto-char (cdr langelem))
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153 (prog1 (current-column)
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154 (if preserve-point
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155 (goto-char here))
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156 )))
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157
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158 (defsubst c-update-modeline ()
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159 ;; set the c-auto-hungry-string for the correct designation on the modeline
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160 (setq c-auto-hungry-string
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161 (if c-auto-newline
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162 (if c-hungry-delete-key "/ah" "/a")
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163 (if c-hungry-delete-key "/h" nil)))
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164 (force-mode-line-update))
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165
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166 (defsubst c-keep-region-active ()
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167 ;; Do whatever is necessary to keep the region active in XEmacs.
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168 ;; Ignore byte-compiler warnings you might see. This is not needed
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169 ;; for Emacs.
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170 (and (boundp 'zmacs-region-stays)
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171 (setq zmacs-region-stays t)))
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172
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173
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174 (provide 'cc-defs)
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175 ;;; cc-defs.el ends here
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