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1 ;;; eval-reg.el --- Redefine eval-region, and subrs that use it, in Lisp
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2
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3 ;; Copyright (C) 1994 Daniel LaLiberte
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4
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5 ;; Author: Daniel LaLiberte <liberte@cs.uiuc.edu>
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6 ;; Keywords: lisp
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: Not in FSF
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26
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27 ;;; Commentary:
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28
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29 ;; eval-region, eval-buffer, and eval-current-buffer are redefined in
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30 ;; Lisp to allow customizations by Lisp code. eval-region calls
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31 ;; `read', `eval', and `prin1', so Lisp replacements of these
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32 ;; functions will affect eval-region and anything else that calls it.
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33 ;; eval-buffer and eval-current-buffer are redefined in Lisp to call
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34 ;; eval-region on the buffer.
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35
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36 ;; Because of dynamic binding, all local variables are protected from
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37 ;; being seen by eval by giving them funky names. But variables in
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38 ;; routines that call eval-region are similarly exposed.
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39
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40 ;; Perhaps this should be one of several files in an `elisp' package
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41 ;; that replaces Emacs Lisp subroutines with Lisp versions of the
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42 ;; same.
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43
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44 ;; Eval-region may be installed, after loading, by calling:
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45 ;; (elisp-eval-region-install). Installation can be undone with:
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46 ;; (elisp-eval-region-uninstall).
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47
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48 ;;; Code:
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49
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50 '(defpackage "elisp-eval-region"
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51 (:nicknames "elisp")
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52 (:use "elisp")
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53 (:export
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54 elisp-eval-region-install
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55 elisp-eval-region-uninstall
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56 elisp-eval-region-level
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57 with-elisp-eval-region
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58 eval-region
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59 eval-buffer
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60 eval-current-buffer
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61 ))
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62 '(in-package elisp-eval-region)
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63
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64 ;; Save standard versions.
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65 (if (not (fboundp 'original-eval-region))
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66 (defalias 'original-eval-region (symbol-function 'eval-region)))
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67 (if (not (fboundp 'original-eval-buffer))
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68 (defalias 'original-eval-buffer
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69 (if (fboundp 'eval-buffer) ;; only in Emacs 19
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70 (symbol-function 'eval-buffer)
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71 'undefined)))
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72 (if (not (fboundp 'original-eval-current-buffer))
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73 (defalias 'original-eval-current-buffer
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74 (symbol-function 'eval-current-buffer)))
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75
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76 (defvar elisp-eval-region-level 0
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77 "If the value is 0, use the original version of `elisp-eval-region'.
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78 Callers of `elisp-eval-region' should increment `elisp-eval-region-level'
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79 while the Lisp version should be used. Installing `elisp-eval-region'
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80 increments it once, and uninstalling decrements it.")
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81
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82 ;; Installing and uninstalling should always be used in pairs,
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83 ;; or just install once and never uninstall.
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84 (defun elisp-eval-region-install ()
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85 (interactive)
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86 (defalias 'eval-region 'elisp-eval-region)
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87 (defalias 'eval-buffer 'elisp-eval-buffer)
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88 (defalias 'eval-current-buffer 'elisp-eval-current-buffer)
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89 (setq elisp-eval-region-level (1+ elisp-eval-region-level)))
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90
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91 (defun elisp-eval-region-uninstall ()
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92 (interactive)
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93 (if (> 1 elisp-eval-region-level)
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94 (setq elisp-eval-region-level (1- elisp-eval-region-level))
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95 (setq elisp-eval-region-level 0)
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96 (defalias 'eval-region (symbol-function 'original-eval-region))
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97 (defalias 'eval-buffer (symbol-function 'original-eval-buffer))
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98 (defalias 'eval-current-buffer
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99 (symbol-function 'original-eval-current-buffer))
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100 ))
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101
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102 (put 'with-elisp-eval-region 'lisp-indent-function 1)
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103 (put 'with-elisp-eval-region 'lisp-indent-hook 1)
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104 (put 'with-elisp-eval-region 'edebug-form-spec t)
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105
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106 (defmacro with-elisp-eval-region (flag &rest body)
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107 "If FLAG is nil, decrement `eval-region-level' while executing BODY.
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108 The effect of decrementing all the way to zero is that `eval-region'
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109 will use the original `eval-region', which may be the Emacs subr or some
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110 previous redefinition. Before calling this macro, this package should
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111 already have been installed, using `elisp-eval-region-install', which
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112 increments the count once. So if another package still requires the
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113 Lisp version of the code, the count will still be non-zero.
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114
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115 The count is not bound locally by this macro, so changes by BODY to
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116 its value will not be lost."
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117 (` (let ((elisp-code (function (lambda () (,@ body)))))
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118 (if (not (, flag))
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119 (unwind-protect
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120 (progn
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121 (setq elisp-eval-region-level (1- elisp-eval-region-level))
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122 (funcall elisp-code))
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123 (setq elisp-eval-region-level (1+ elisp-eval-region-level)))
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124 (funcall elisp-code)))))
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125
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126
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127 (defun elisp-eval-region (elisp-start elisp-end &optional elisp-output)
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128 "Execute the region as Lisp code.
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129 When called from programs, expects two arguments,
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130 giving starting and ending indices in the current buffer
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131 of the text to be executed.
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132 Programs can pass third argument PRINTFLAG which controls printing of output:
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133 nil means discard it; anything else is stream for print.
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134
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135 This version, from `eval-reg.el', allows Lisp customization of read,
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136 eval, and the printer."
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137
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138 ;; Because this doesnt narrow to the region, one other difference
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139 ;; concerns inserting whitespace after the expression being evaluated.
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140
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141 (interactive "r")
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142 (if (= 0 elisp-eval-region-level)
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143 (original-eval-region elisp-start elisp-end elisp-output)
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144 (let ((elisp-pnt (point))
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145 (elisp-buf (current-buffer));; Outside buffer
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146 (elisp-inside-buf (current-buffer));; Buffer current while evaling
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147 ;; Mark the end because it may move.
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148 (elisp-end-marker (set-marker (make-marker) elisp-end))
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149 elisp-form
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150 elisp-val)
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151 (goto-char elisp-start)
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152 (elisp-skip-whitespace)
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153 (while (< (point) elisp-end-marker)
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154 (setq elisp-form (read elisp-buf))
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155
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156 (let ((elisp-current-buffer (current-buffer)))
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157 ;; Restore the inside current-buffer.
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158 (set-buffer elisp-inside-buf)
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159 (setq elisp-val (eval elisp-form))
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160 ;; Remember current buffer for next time.
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161 (setq elisp-inside-buf (current-buffer))
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162 ;; Should this be protected?
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163 (set-buffer elisp-current-buffer))
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164
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165 (if elisp-output
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166 (let ((standard-output (or elisp-output t)))
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167 (setq values (cons elisp-val values))
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168 (if (eq standard-output t)
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169 (prin1 elisp-val)
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170 (princ "\n")
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171 (prin1 elisp-val)
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172 (princ "\n")
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173 )))
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174 (goto-char (min (max elisp-end-marker (point))
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175 (progn (elisp-skip-whitespace) (point))))
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176 ) ; while
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177 (if elisp-output nil
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178 ;; like save-excursion recovery, but done only if no error occurs
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179 ;; but mark is not restored
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180 (set-buffer elisp-buf)
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181 (goto-char elisp-pnt))
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182 nil)))
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183
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184
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185 (defun elisp-skip-whitespace ()
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186 ;; Leave point before the next token, skipping white space and comments.
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187 (skip-chars-forward " \t\r\n\f")
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188 (while (= (following-char) ?\;)
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189 (skip-chars-forward "^\n\r") ; skip the comment
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190 (skip-chars-forward " \t\r\n\f")))
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191
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192
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193 (defun elisp-eval-current-buffer (&optional elisp-output)
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194 "Execute the current buffer as Lisp code.
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195 Programs can pass argument PRINTFLAG which controls printing of output:
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196 nil means discard it; anything else is stream for print.
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197
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198 This version calls `eval-region' on the whole buffer."
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199 ;; The standard eval-current-buffer doesn't use eval-region.
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200 (interactive)
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201 (eval-region (point-min) (point-max) elisp-output))
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202
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203
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204 (defun elisp-eval-buffer (&optional elisp-bufname elisp-printflag)
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205 "Execute BUFFER as Lisp code. Use current buffer if BUFFER is nil.
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206 Programs can pass argument PRINTFLAG which controls printing of
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207 output: nil means discard it; anything else is stream for print.
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208
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209 This version calls `eval-region' on the whole buffer."
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210 (interactive)
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211 (if (null elisp-bufname)
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212 (setq elisp-bufname (current-buffer)))
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213 (save-excursion
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214 (set-buffer (or (get-buffer elisp-bufname)
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215 (error "No such buffer: %s" elisp-bufname)))
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216 (eval-region (point-min) (point-max) elisp-printflag)))
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217
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218 (provide 'eval-reg)
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219
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220 ;;; eval-reg.el ends here
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