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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
;;; pp.el --- pretty printer for Emacs Lisp
;; Copyright (C) 1989, 1993, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
;; Author: Randal Schwartz <merlyn@stonehenge.com>
;; Keywords: lisp
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(defvar font-lock-verbose)
(defgroup pp nil
"Pretty printer for Emacs Lisp."
:prefix "pp-"
:group 'lisp)
(defcustom pp-escape-newlines t
"Value of `print-escape-newlines' used by pp-* functions."
:type 'boolean
:group 'pp)
;;;###autoload
(defun pp-to-string (object)
"Return a string containing the pretty-printed representation of OBJECT.
OBJECT can be any Lisp object. Quoting characters are used as needed
to make output that `read' can handle, whenever this is possible."
(with-current-buffer (generate-new-buffer " pp-to-string")
(unwind-protect
(progn
(lisp-mode-variables nil)
(set-syntax-table emacs-lisp-mode-syntax-table)
(let ((print-escape-newlines pp-escape-newlines)
(print-quoted t))
(prin1 object (current-buffer)))
(pp-buffer)
(buffer-string))
(kill-buffer (current-buffer)))))
;;;###autoload
(defun pp-buffer ()
"Prettify the current buffer with printed representation of a Lisp object."
(goto-char (point-min))
(while (not (eobp))
;; (message "%06d" (- (point-max) (point)))
(cond
((condition-case err-var
(prog1 t (down-list 1))
(error nil))
(save-excursion
(backward-char 1)
(skip-chars-backward "'`#^")
(when (and (not (bobp)) (memq (char-before) '(?\s ?\t ?\n)))
(delete-region
(point)
(progn (skip-chars-backward " \t\n") (point)))
(insert "\n"))))
((condition-case err-var
(prog1 t (up-list 1))
(error nil))
(while (looking-at "\\s)")
(forward-char 1))
(delete-region
(point)
(progn (skip-chars-forward " \t\n") (point)))
(insert ?\n))
(t (goto-char (point-max)))))
(goto-char (point-min))
(indent-sexp))
;;;###autoload
(defun pp (object &optional stream)
"Output the pretty-printed representation of OBJECT, any Lisp object.
Quoting characters are printed as 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)))
(defun pp-display-expression (expression out-buffer-name)
"Prettify and display EXPRESSION in an appropriate way, depending on length.
If a temporary buffer is needed for representation, it will be named
after OUT-BUFFER-NAME."
(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)
(with-current-buffer buf
(goto-char (point-min))
(end-of-line 1)
(if (or (< (1+ (point)) (point-max))
(>= (- (point) (point-min)) (frame-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 "See buffer %s." out-buffer-name)))
(message "%s" (buffer-substring (point-min) (point)))
))))))
(with-output-to-temp-buffer out-buffer-name
(pp expression)
(with-current-buffer standard-output
(emacs-lisp-mode)
(setq buffer-read-only nil)
(set (make-local-variable 'font-lock-verbose) nil)))))
;;;###autoload
(defun pp-eval-expression (expression)
"Evaluate EXPRESSION and pretty-print its value.
Also add the value to the front of the list in the variable `values'."
(interactive
(list (read-from-minibuffer "Eval: " nil read-expression-map t
'read-expression-history)))
(message "Evaluating...")
(setq values (cons (eval expression) values))
(pp-display-expression (car values) "*Pp Eval Output*"))
;;;###autoload
(defun pp-macroexpand-expression (expression)
"Macroexpand EXPRESSION and pretty-print its value."
(interactive
(list (read-from-minibuffer "Macroexpand: " nil read-expression-map t
'read-expression-history)))
(pp-display-expression (macroexpand expression) "*Pp Macroexpand Output*"))
(defun pp-last-sexp ()
"Read sexp before point. Ignores leading comment characters."
(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)
exp))
;;;###autoload
(defun pp-eval-last-sexp (arg)
"Run `pp-eval-expression' on sexp before point.
With argument, pretty-print output into current buffer.
Ignores leading comment characters."
(interactive "P")
(if arg
(insert (pp-to-string (eval (pp-last-sexp))))
(pp-eval-expression (pp-last-sexp))))
;;;###autoload
(defun pp-macroexpand-last-sexp (arg)
"Run `pp-macroexpand-expression' on sexp before point.
With argument, pretty-print output into current buffer.
Ignores leading comment characters."
(interactive "P")
(if arg
(insert (pp-to-string (macroexpand (pp-last-sexp))))
(pp-macroexpand-expression (pp-last-sexp))))
;;; 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
;; arch-tag: b0f7c65b-02c7-42bb-9ee3-508a59b8fbb9
;;; pp.el ends here
|
