1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
;;; pp.el --- pretty printer for Emacs Lisp
;; Copyright (C) 1989, 1993 Free Software Foundation, Inc.
;; Author: Randal Schwartz <merlyn@ora.com>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Code:
(defvar pp-escape-newlines t
"*Value of print-escape-newlines used by pp-* functions.")
(defun pp-to-string (object)
"Return a string containing the pretty-printed representation of OBJECT,
any Lisp object. Quoting characters are used when needed to make output
that `read' can handle, whenever this is possible."
(save-excursion
(set-buffer (generate-new-buffer " pp-to-string"))
(unwind-protect
(progn
(lisp-mode-variables t)
(let ((print-escape-newlines pp-escape-newlines))
(prin1 object (current-buffer)))
(goto-char (point-min))
(while (not (eobp))
;; (message "%06d" (- (point-max) (point)))
(cond
((looking-at "\\s\(")
(while (looking-at "\\s(")
(forward-char 1)))
((and (looking-at "\\(quote[ \t]+\\)\\([^.)]\\)")
(> (match-beginning 1) 1)
(= ?\( (char-after (1- (match-beginning 1))))
;; Make sure this is a two-element list.
(save-excursion
(goto-char (match-beginning 2))
(forward-sexp)
;; (looking-at "[ \t]*\)")
;; Avoid mucking with match-data; does this test work?
(char-equal ?\) (char-after (point)))))
;; -1 gets the paren preceding the quote as well.
(delete-region (1- (match-beginning 1)) (match-end 1))
(insert "'")
(forward-sexp 1)
(if (looking-at "[ \t]*\)")
(delete-region (match-beginning 0) (match-end 0))
(error "Malformed quote"))
(backward-sexp 1))
((condition-case err-var
(prog1 t (down-list 1))
(error nil))
(backward-char 1)
(skip-chars-backward " \t")
(delete-region
(point)
(progn (skip-chars-forward " \t") (point)))
(if (not (char-equal ?' (char-after (1- (point)))))
(insert ?\n)))
((condition-case err-var
(prog1 t (up-list 1))
(error nil))
(while (looking-at "\\s)")
(forward-char 1))
(skip-chars-backward " \t")
(delete-region
(point)
(progn (skip-chars-forward " \t") (point)))
(if (not (char-equal ?' (char-after (1- (point)))))
(insert ?\n)))
(t (goto-char (point-max)))))
(goto-char (point-min))
(indent-sexp)
(buffer-string))
(kill-buffer (current-buffer)))))
;;;###autoload
(defun pp (object &optional stream)
"Output the pretty-printed representation of OBJECT, any Lisp object.
Quoting characters are printed when needed to make output that `read'
can handle, whenever this is possible.
Output stream is STREAM, or value of `standard-output' (which see)."
(princ (pp-to-string object) (or stream standard-output)))
;;;###autoload
(defun pp-eval-expression (expression)
"Evaluate EXPRESSION and pretty-print value into a new display buffer.
If the pretty-printed value fits on one line, the message line is used
instead. Value is also consed on to front of variable values 's
value."
(interactive "xPp-eval: ")
(setq values (cons (eval expression) values))
(let* ((old-show-function temp-buffer-show-function)
;; Use this function to display the buffer.
;; This function either decides not to display it at all
;; or displays it in the usual way.
(temp-buffer-show-function
(function
(lambda (buf)
(save-excursion
(set-buffer buf)
(goto-char (point-min))
(end-of-line 1)
(if (or (< (1+ (point)) (point-max))
(>= (- (point) (point-min)) (screen-width)))
(let ((temp-buffer-show-function old-show-function)
(old-selected (selected-window))
(window (display-buffer buf)))
(goto-char (point-min)) ; expected by some hooks ...
(make-frame-visible (window-frame window))
(unwind-protect
(progn
(select-window window)
(run-hooks 'temp-buffer-show-hook))
(select-window old-selected)))
(message "%s" (buffer-substring (point-min) (point)))
))))))
(with-output-to-temp-buffer "*Pp Eval Output*"
(pp (car values)))
(save-excursion
(set-buffer "*Pp Eval Output*")
(emacs-lisp-mode))))
;;;###autoload
(defun pp-eval-last-sexp (arg)
"Run `pp-eval-expression' on sexp before point (which see).
With argument, pretty-print output into current buffer.
Ignores leading comment characters."
(interactive "P")
(let ((stab (syntax-table)) (pt (point)) start exp)
(set-syntax-table emacs-lisp-mode-syntax-table)
(save-excursion
(forward-sexp -1)
;; If first line is commented, ignore all leading comments:
(if (save-excursion (beginning-of-line) (looking-at "[ \t]*;"))
(progn
(setq exp (buffer-substring (point) pt))
(while (string-match "\n[ \t]*;+" exp start)
(setq start (1+ (match-beginning 0))
exp (concat (substring exp 0 start)
(substring exp (match-end 0)))))
(setq exp (read exp)))
(setq exp (read (current-buffer)))))
(set-syntax-table stab)
(if arg
(insert (pp-to-string (eval exp)))
(pp-eval-expression exp))))
;;; Test cases for quote
;; (pp-eval-expression ''(quote quote))
;; (pp-eval-expression ''((quote a) (quote b)))
;; (pp-eval-expression ''('a 'b)) ; same as above
;; (pp-eval-expression ''((quote (quote quote)) (quote quote)))
;; These do not satisfy the quote test.
;; (pp-eval-expression ''quote)
;; (pp-eval-expression ''(quote))
;; (pp-eval-expression ''(quote . quote))
;; (pp-eval-expression ''(quote a b))
;; (pp-eval-expression ''(quotefoo))
;; (pp-eval-expression ''(a b))
(provide 'pp) ; so (require 'pp) works
;;; pp.el ends here.
|
