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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 GNU Emacs.
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9
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10 ;; GNU Emacs is free software; you can redistribute it and/or modify
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11 ;; it 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 ;; GNU Emacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU 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
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22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;;; Commentary:
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25
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26 ;;; eval-region, eval-buffer, and eval-current-buffer are redefined in
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27 ;;; Lisp to allow customizations by Lisp code. eval-region calls
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28 ;;; `read', `eval', and `prin1', so Lisp replacements of these
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29 ;;; functions will affect eval-region and anything else that calls it.
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30 ;;; eval-buffer and eval-current-buffer are redefined in Lisp to call
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31 ;;; eval-region on the buffer.
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32
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33 ;;; Because of dynamic binding, all local variables are protected from
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34 ;;; being seen by eval by giving them funky names. But variables in
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35 ;;; routines that call eval-region are similarly exposed.
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36
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37 ;;; Perhaps this should be one of several files in an `elisp' package
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38 ;;; that replaces Emacs Lisp subroutines with Lisp versions of the
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39 ;;; same.
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40
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41 ;;; Eval-region may be installed, after loading, by calling:
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42 ;;; (elisp-eval-region-install). Installation can be undone with:
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43 ;;; (elisp-eval-region-uninstall).
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44
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45 '(defpackage "elisp-eval-region"
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46 (:nicknames "elisp")
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47 (:use "elisp")
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48 (:export
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49 elisp-eval-region-install
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50 elisp-eval-region-uninstall
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51 elisp-eval-region-level
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52 with-elisp-eval-region
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53 eval-region
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54 eval-buffer
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55 eval-current-buffer
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56 ))
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57 '(in-package elisp-eval-region)
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58
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59 ;; Save standard versions.
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60 (if (not (fboundp 'original-eval-region))
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61 (defalias 'original-eval-region (symbol-function 'eval-region)))
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62 (if (not (fboundp 'original-eval-buffer))
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63 (defalias 'original-eval-buffer
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64 (if (fboundp 'eval-buffer) ;; only in Emacs 19
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65 (symbol-function 'eval-buffer)
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66 'undefined)))
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67 (if (not (fboundp 'original-eval-current-buffer))
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68 (defalias 'original-eval-current-buffer
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69 (symbol-function 'eval-current-buffer)))
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70
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71 (defvar elisp-eval-region-level 0
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72 "If the value is 0, use the original version of `elisp-eval-region'.
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73 Callers of `elisp-eval-region' should increment `elisp-eval-region-level'
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74 while the Lisp version should be used. Installing `elisp-eval-region'
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75 increments it once, and uninstalling decrements it.")
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76
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77 ;; Installing and uninstalling should always be used in pairs,
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78 ;; or just install once and never uninstall.
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79 (defun elisp-eval-region-install ()
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80 (interactive)
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81 (defalias 'eval-region 'elisp-eval-region)
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82 (defalias 'eval-buffer 'elisp-eval-buffer)
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83 (defalias 'eval-current-buffer 'elisp-eval-current-buffer)
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84 (setq elisp-eval-region-level (1+ elisp-eval-region-level)))
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85
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86 (defun elisp-eval-region-uninstall ()
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87 (interactive)
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88 (if (> 1 elisp-eval-region-level)
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89 (setq elisp-eval-region-level (1- elisp-eval-region-level))
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90 (setq elisp-eval-region-level 0)
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91 (defalias 'eval-region (symbol-function 'original-eval-region))
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92 (defalias 'eval-buffer (symbol-function 'original-eval-buffer))
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93 (defalias 'eval-current-buffer
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94 (symbol-function 'original-eval-current-buffer))
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95 ))
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96
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97 (put 'with-elisp-eval-region 'lisp-indent-function 1)
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98 (put 'with-elisp-eval-region 'lisp-indent-hook 1)
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99 (put 'with-elisp-eval-region 'edebug-form-spec t)
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100
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101 (defmacro with-elisp-eval-region (flag &rest body)
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102 "If FLAG is nil, decrement `eval-region-level' while executing BODY.
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103 The effect of decrementing all the way to zero is that `eval-region'
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104 will use the original `eval-region', which may be the Emacs subr or some
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105 previous redefinition. Before calling this macro, this package should
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106 already have been installed, using `elisp-eval-region-install', which
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107 increments the count once. So if another package still requires the
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108 Lisp version of the code, the count will still be non-zero.
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109
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110 The count is not bound locally by this macro, so changes by BODY to
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111 its value will not be lost."
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112 (` (let ((elisp-code (function (lambda () (,@ body)))))
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113 (if (not (, flag))
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114 (unwind-protect
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115 (progn
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116 (setq elisp-eval-region-level (1- elisp-eval-region-level))
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117 (funcall elisp-code))
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118 (setq elisp-eval-region-level (1+ elisp-eval-region-level)))
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119 (funcall elisp-code)))))
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120
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121
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122 (defun elisp-eval-region (elisp-start elisp-end &optional elisp-output)
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123 "Execute the region as Lisp code.
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124 When called from programs, expects two arguments,
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125 giving starting and ending indices in the current buffer
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126 of the text to be executed.
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127 Programs can pass third argument PRINTFLAG which controls printing of output:
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128 nil means discard it; anything else is stream for print.
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129
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130 This version, from `eval-reg.el', allows Lisp customization of read,
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131 eval, and the printer."
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132
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133 ;; Because this doesnt narrow to the region, one other difference
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134 ;; concerns inserting whitespace after the expression being evaluated.
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135
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136 (interactive "r")
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137 (if (= 0 elisp-eval-region-level)
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138 (original-eval-region elisp-start elisp-end elisp-output)
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139 (let ((elisp-pnt (point))
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140 (elisp-buf (current-buffer));; Outside buffer
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141 (elisp-inside-buf (current-buffer));; Buffer current while evaling
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142 ;; Mark the end because it may move.
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143 (elisp-end-marker (set-marker (make-marker) elisp-end))
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144 elisp-form
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145 elisp-val)
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146 (goto-char elisp-start)
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147 (elisp-skip-whitespace)
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148 (while (< (point) elisp-end-marker)
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149 (setq elisp-form (read elisp-buf))
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150
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151 (let ((elisp-current-buffer (current-buffer)))
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152 ;; Restore the inside current-buffer.
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153 (set-buffer elisp-inside-buf)
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154 (setq elisp-val (eval elisp-form))
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155 ;; Remember current buffer for next time.
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156 (setq elisp-inside-buf (current-buffer))
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157 ;; Should this be protected?
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158 (set-buffer elisp-current-buffer))
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159
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160 (if elisp-output
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161 (let ((standard-output (or elisp-output t)))
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162 (setq values (cons elisp-val values))
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163 (if (eq standard-output t)
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164 (prin1 elisp-val)
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165 (princ "\n")
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166 (prin1 elisp-val)
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167 (princ "\n")
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168 )))
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169 (goto-char (min (max elisp-end-marker (point))
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170 (progn (elisp-skip-whitespace) (point))))
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171 ) ; while
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172 (if elisp-output nil
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173 ;; like save-excursion recovery, but done only if no error occurs
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174 ;; but mark is not restored
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175 (set-buffer elisp-buf)
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176 (goto-char elisp-pnt))
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177 nil)))
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178
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179
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180 (defun elisp-skip-whitespace ()
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181 ;; Leave point before the next token, skipping white space and comments.
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182 (skip-chars-forward " \t\r\n\f")
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183 (while (= (following-char) ?\;)
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184 (skip-chars-forward "^\n\r") ; skip the comment
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185 (skip-chars-forward " \t\r\n\f")))
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186
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187
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188 (defun elisp-eval-current-buffer (&optional elisp-output)
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189 "Execute the current buffer as Lisp code.
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190 Programs can pass argument PRINTFLAG which controls printing of output:
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191 nil means discard it; anything else is stream for print.
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192
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193 This version calls `eval-region' on the whole buffer."
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194 ;; The standard eval-current-buffer doesn't use eval-region.
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195 (interactive)
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196 (eval-region (point-min) (point-max) elisp-output))
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197
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198
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199 (defun elisp-eval-buffer (&optional elisp-bufname elisp-printflag)
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200 "Execute BUFFER as Lisp code. Use current buffer if BUFFER is nil.
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201 Programs can pass argument PRINTFLAG which controls printing of
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202 output: nil means discard it; anything else is stream for print.
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203
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204 This version calls `eval-region' on the whole buffer."
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205 (interactive)
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206 (if (null elisp-bufname)
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207 (setq elisp-bufname (current-buffer)))
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208 (save-excursion
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209 (set-buffer (or (get-buffer elisp-bufname)
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210 (error "No such buffer: %s" elisp-bufname)))
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211 (eval-region (point-min) (point-max) elisp-printflag)))
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212
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214 (provide 'eval-reg)
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215
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216 ;;; eval-reg.el ends here
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