|
0
|
1 ;;; pp.el --- pretty printer for Emacs Lisp
|
|
|
2
|
|
|
3 ;; Copyright (C) 1989, 1993 Free Software Foundation, Inc.
|
|
|
4
|
|
2
|
5 ;; Author: Randal Schwartz <merlyn@stonehenge.com>
|
|
|
6 ;; Keywords: lisp, tools, language, extensions
|
|
0
|
7
|
|
|
8 ;; This file is part of XEmacs.
|
|
|
9
|
|
|
10 ;; XEmacs is free software; you can redistribute it and/or modify it
|
|
|
11 ;; under the terms of the GNU General Public License as published by
|
|
|
12 ;; the Free Software Foundation; either version 2, or (at your option)
|
|
|
13 ;; any later version.
|
|
|
14
|
|
|
15 ;; XEmacs is distributed in the hope that it will be useful, but
|
|
|
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
18 ;; General Public License for more details.
|
|
|
19
|
|
|
20 ;; You should have received a copy of the GNU General Public License
|
|
|
21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
|
|
2
|
22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
|
|
23 ;; 02111-1307, USA.
|
|
0
|
24
|
|
2
|
25 ;;; Synched up with: FSF 19.34.
|
|
0
|
26
|
|
|
27 ;;; Code:
|
|
|
28
|
|
|
29 (defvar pp-escape-newlines t
|
|
2
|
30 "*Value of print-escape-newlines used by pp-* functions.")
|
|
|
31 ;; XEmacs changes
|
|
0
|
32 (defvar pp-print-readably t
|
|
|
33 "*Value of `print-readably' used by pp-* functions.")
|
|
|
34
|
|
|
35 ;;;###autoload
|
|
|
36 (defalias 'pprint 'pp)
|
|
|
37
|
|
|
38 (defun pp-to-string (object)
|
|
|
39 "Return a string containing the pretty-printed representation of OBJECT,
|
|
|
40 any Lisp object. Quoting characters are used when needed to make output
|
|
|
41 that `read' can handle, whenever this is possible."
|
|
|
42 (save-excursion
|
|
|
43 (set-buffer (generate-new-buffer " pp-to-string"))
|
|
|
44 (unwind-protect
|
|
|
45 (progn
|
|
2
|
46 (lisp-mode-variables t)
|
|
|
47 (let ((print-escape-newlines pp-escape-newlines))
|
|
0
|
48 (prin1 object (current-buffer)))
|
|
|
49 (goto-char (point-min))
|
|
|
50 (while (not (eobp))
|
|
|
51 ;; (message "%06d" (- (point-max) (point)))
|
|
|
52 (cond
|
|
2
|
53 ((looking-at "\\s(\\|#\\s(")
|
|
|
54 (while (looking-at "\\s(\\|#\\s(")
|
|
0
|
55 (forward-char 1)))
|
|
|
56 ((and (looking-at "\\(quote[ \t]+\\)\\([^.)]\\)")
|
|
|
57 (> (match-beginning 1) 1)
|
|
|
58 (= ?\( (char-after (1- (match-beginning 1))))
|
|
|
59 ;; Make sure this is a two-element list.
|
|
|
60 (save-excursion
|
|
|
61 (goto-char (match-beginning 2))
|
|
|
62 (forward-sexp)
|
|
|
63 ;; (looking-at "[ \t]*\)")
|
|
|
64 ;; Avoid mucking with match-data; does this test work?
|
|
|
65 (char-equal ?\) (char-after (point)))))
|
|
|
66 ;; -1 gets the paren preceding the quote as well.
|
|
|
67 (delete-region (1- (match-beginning 1)) (match-end 1))
|
|
|
68 (insert "'")
|
|
|
69 (forward-sexp 1)
|
|
|
70 (if (looking-at "[ \t]*\)")
|
|
|
71 (delete-region (match-beginning 0) (match-end 0))
|
|
|
72 (error "Malformed quote"))
|
|
|
73 (backward-sexp 1))
|
|
|
74 ((condition-case err-var
|
|
|
75 (prog1 t (down-list 1))
|
|
|
76 (error nil))
|
|
|
77 (backward-char 1)
|
|
|
78 (skip-chars-backward " \t")
|
|
|
79 (delete-region
|
|
|
80 (point)
|
|
|
81 (progn (skip-chars-forward " \t") (point)))
|
|
|
82 (if (not (char-equal ?' (char-after (1- (point)))))
|
|
|
83 (insert ?\n)))
|
|
|
84 ((condition-case err-var
|
|
|
85 (prog1 t (up-list 1))
|
|
|
86 (error nil))
|
|
|
87 (while (looking-at "\\s)")
|
|
|
88 (forward-char 1))
|
|
|
89 (skip-chars-backward " \t")
|
|
|
90 (delete-region
|
|
|
91 (point)
|
|
|
92 (progn (skip-chars-forward " \t") (point)))
|
|
|
93 (if (not (char-equal ?' (char-after (1- (point)))))
|
|
|
94 (insert ?\n)))
|
|
|
95 (t (goto-char (point-max)))))
|
|
|
96 (goto-char (point-min))
|
|
|
97 (indent-sexp)
|
|
|
98 (buffer-string))
|
|
|
99 (kill-buffer (current-buffer)))))
|
|
|
100
|
|
2
|
101 ;;;###autoload
|
|
|
102 (defun pp (object &optional stream)
|
|
|
103 "Output the pretty-printed representation of OBJECT, any Lisp object.
|
|
|
104 Quoting characters are printed when needed to make output that `read'
|
|
|
105 can handle, whenever this is possible.
|
|
|
106 Output stream is STREAM, or value of `standard-output' (which see)."
|
|
|
107 (princ (pp-to-string object) (or stream standard-output)))
|
|
|
108
|
|
|
109 ;;;###autoload
|
|
0
|
110 (defun pp-eval-expression (expression)
|
|
|
111 "Evaluate EXPRESSION and pretty-print value into a new display buffer.
|
|
|
112 If the pretty-printed value fits on one line, the message line is used
|
|
|
113 instead. Value is also consed on to front of variable values 's
|
|
|
114 value."
|
|
|
115 (interactive "xPp-eval: ")
|
|
|
116 (setq values (cons (eval expression) values))
|
|
2
|
117 (let* ((old-show-function temp-buffer-show-function)
|
|
|
118 ;; Use this function to display the buffer.
|
|
|
119 ;; This function either decides not to display it at all
|
|
|
120 ;; or displays it in the usual way.
|
|
|
121 (temp-buffer-show-function
|
|
0
|
122 (function
|
|
|
123 (lambda (buf)
|
|
|
124 (save-excursion
|
|
|
125 (set-buffer buf)
|
|
|
126 (goto-char (point-min))
|
|
|
127 (end-of-line 1)
|
|
|
128 (if (or (< (1+ (point)) (point-max))
|
|
2
|
129 (>= (- (point) (point-min)) (frame-width)))
|
|
|
130 (let ((temp-buffer-show-function old-show-function)
|
|
|
131 (old-selected (selected-window))
|
|
|
132 (window (display-buffer buf)))
|
|
0
|
133 (goto-char (point-min)) ; expected by some hooks ...
|
|
2
|
134 (make-frame-visible (window-frame window))
|
|
|
135 (unwind-protect
|
|
|
136 (progn
|
|
|
137 (select-window window)
|
|
|
138 (run-hooks 'temp-buffer-show-hook))
|
|
|
139 (select-window old-selected)))
|
|
0
|
140 (message "%s" (buffer-substring (point-min) (point)))
|
|
2
|
141 ))))))
|
|
0
|
142 (with-output-to-temp-buffer "*Pp Eval Output*"
|
|
|
143 (pp (car values)))
|
|
|
144 (save-excursion
|
|
|
145 (set-buffer "*Pp Eval Output*")
|
|
2
|
146 (let (emacs-lisp-mode-hook)
|
|
|
147 (emacs-lisp-mode)))))
|
|
0
|
148
|
|
2
|
149 ;;;###autoload
|
|
0
|
150 (defun pp-eval-last-sexp (arg)
|
|
|
151 "Run `pp-eval-expression' on sexp before point (which see).
|
|
|
152 With argument, pretty-print output into current buffer.
|
|
|
153 Ignores leading comment characters."
|
|
|
154 (interactive "P")
|
|
|
155 (let ((stab (syntax-table)) (pt (point)) start exp)
|
|
|
156 (set-syntax-table emacs-lisp-mode-syntax-table)
|
|
|
157 (save-excursion
|
|
|
158 (forward-sexp -1)
|
|
|
159 ;; If first line is commented, ignore all leading comments:
|
|
|
160 (if (save-excursion (beginning-of-line) (looking-at "[ \t]*;"))
|
|
|
161 (progn
|
|
|
162 (setq exp (buffer-substring (point) pt))
|
|
|
163 (while (string-match "\n[ \t]*;+" exp start)
|
|
|
164 (setq start (1+ (match-beginning 0))
|
|
|
165 exp (concat (substring exp 0 start)
|
|
|
166 (substring exp (match-end 0)))))
|
|
|
167 (setq exp (read exp)))
|
|
|
168 (setq exp (read (current-buffer)))))
|
|
|
169 (set-syntax-table stab)
|
|
|
170 (if arg
|
|
|
171 (insert (pp-to-string (eval exp)))
|
|
|
172 (pp-eval-expression exp))))
|
|
|
173
|
|
|
174 ;;; Test cases for quote
|
|
|
175 ;; (pp-eval-expression ''(quote quote))
|
|
|
176 ;; (pp-eval-expression ''((quote a) (quote b)))
|
|
|
177 ;; (pp-eval-expression ''('a 'b)) ; same as above
|
|
|
178 ;; (pp-eval-expression ''((quote (quote quote)) (quote quote)))
|
|
|
179 ;; These do not satisfy the quote test.
|
|
|
180 ;; (pp-eval-expression ''quote)
|
|
|
181 ;; (pp-eval-expression ''(quote))
|
|
|
182 ;; (pp-eval-expression ''(quote . quote))
|
|
|
183 ;; (pp-eval-expression ''(quote a b))
|
|
|
184 ;; (pp-eval-expression ''(quotefoo))
|
|
|
185 ;; (pp-eval-expression ''(a b))
|
|
|
186
|
|
|
187 (provide 'pp) ; so (require 'pp) works
|
|
|
188
|
|
|
189 ;;; pp.el ends here.
|
