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177 lines
5.9 KiB
EmacsLisp
177 lines
5.9 KiB
EmacsLisp
;;; pp.el --- pretty printer for Emacs Lisp
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;; Copyright (C) 1989, 1993, 2001, 2004 Free Software Foundation, Inc.
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;; Author: Randal Schwartz <merlyn@stonehenge.com>
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;; Keywords: lisp
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(defgroup pp nil
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"Pretty printer for Emacs Lisp."
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:prefix "pp-"
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:group 'lisp)
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(defcustom pp-escape-newlines t
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"*Value of `print-escape-newlines' used by pp-* functions."
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:type 'boolean
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:group 'pp)
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;;;###autoload
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(defun pp-to-string (object)
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"Return a string containing the pretty-printed representation of OBJECT.
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OBJECT can be any Lisp object. Quoting characters are used as needed
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to make output that `read' can handle, whenever this is possible."
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(save-excursion
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(set-buffer (generate-new-buffer " pp-to-string"))
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(unwind-protect
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(progn
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(lisp-mode-variables nil)
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(set-syntax-table emacs-lisp-mode-syntax-table)
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(let ((print-escape-newlines pp-escape-newlines)
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(print-quoted t))
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(prin1 object (current-buffer)))
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(pp-buffer)
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(buffer-string))
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(kill-buffer (current-buffer)))))
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;;;###autoload
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(defun pp-buffer ()
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"Prettify the current buffer with printed representation of a Lisp object."
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(goto-char (point-min))
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(while (not (eobp))
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;; (message "%06d" (- (point-max) (point)))
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(cond
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((condition-case err-var
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(prog1 t (down-list 1))
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(error nil))
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(save-excursion
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(backward-char 1)
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(skip-chars-backward "'`#^")
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(when (and (not (bobp)) (memq (char-before) '(?\ ?\t ?\n)))
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(delete-region
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(point)
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(progn (skip-chars-backward " \t\n") (point)))
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(insert "\n"))))
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((condition-case err-var
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(prog1 t (up-list 1))
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(error nil))
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(while (looking-at "\\s)")
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(forward-char 1))
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(delete-region
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(point)
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(progn (skip-chars-forward " \t\n") (point)))
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(insert ?\n))
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(t (goto-char (point-max)))))
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(goto-char (point-min))
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(indent-sexp))
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;;;###autoload
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(defun pp (object &optional stream)
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"Output the pretty-printed representation of OBJECT, any Lisp object.
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Quoting characters are printed as needed to make output that `read'
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can handle, whenever this is possible.
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Output stream is STREAM, or value of `standard-output' (which see)."
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(princ (pp-to-string object) (or stream standard-output)))
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;;;###autoload
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(defun pp-eval-expression (expression)
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"Evaluate EXPRESSION and pretty-print value into a new display buffer.
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If the pretty-printed value fits on one line, the message line is used
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instead. The value is also consed onto the front of the list
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in the variable `values'."
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(interactive "xPp-eval: ")
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(setq values (cons (eval expression) values))
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(let* ((old-show-function temp-buffer-show-function)
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;; Use this function to display the buffer.
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;; This function either decides not to display it at all
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;; or displays it in the usual way.
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(temp-buffer-show-function
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(function
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(lambda (buf)
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(save-excursion
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(set-buffer buf)
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(goto-char (point-min))
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(end-of-line 1)
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(if (or (< (1+ (point)) (point-max))
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(>= (- (point) (point-min)) (frame-width)))
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(let ((temp-buffer-show-function old-show-function)
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(old-selected (selected-window))
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(window (display-buffer buf)))
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(goto-char (point-min)) ; expected by some hooks ...
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(make-frame-visible (window-frame window))
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(unwind-protect
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(progn
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(select-window window)
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(run-hooks 'temp-buffer-show-hook))
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(select-window old-selected)))
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(message "%s" (buffer-substring (point-min) (point)))
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))))))
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(with-output-to-temp-buffer "*Pp Eval Output*"
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(pp (car values))
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(with-current-buffer standard-output
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(emacs-lisp-mode)
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(set (make-local-variable 'font-lock-verbose) nil)))))
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;;;###autoload
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(defun pp-eval-last-sexp (arg)
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"Run `pp-eval-expression' on sexp before point (which see).
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With argument, pretty-print output into current buffer.
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Ignores leading comment characters."
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(interactive "P")
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(let ((stab (syntax-table)) (pt (point)) start exp)
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(set-syntax-table emacs-lisp-mode-syntax-table)
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(save-excursion
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(forward-sexp -1)
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;; If first line is commented, ignore all leading comments:
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(if (save-excursion (beginning-of-line) (looking-at "[ \t]*;"))
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(progn
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(setq exp (buffer-substring (point) pt))
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(while (string-match "\n[ \t]*;+" exp start)
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(setq start (1+ (match-beginning 0))
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exp (concat (substring exp 0 start)
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(substring exp (match-end 0)))))
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(setq exp (read exp)))
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(setq exp (read (current-buffer)))))
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(set-syntax-table stab)
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(if arg
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(insert (pp-to-string (eval exp)))
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(pp-eval-expression exp))))
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;;; Test cases for quote
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;; (pp-eval-expression ''(quote quote))
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;; (pp-eval-expression ''((quote a) (quote b)))
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;; (pp-eval-expression ''('a 'b)) ; same as above
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;; (pp-eval-expression ''((quote (quote quote)) (quote quote)))
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;; These do not satisfy the quote test.
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;; (pp-eval-expression ''quote)
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;; (pp-eval-expression ''(quote))
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;; (pp-eval-expression ''(quote . quote))
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;; (pp-eval-expression ''(quote a b))
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;; (pp-eval-expression ''(quotefoo))
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;; (pp-eval-expression ''(a b))
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(provide 'pp) ; so (require 'pp) works
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;;; arch-tag: b0f7c65b-02c7-42bb-9ee3-508a59b8fbb9
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;;; pp.el ends here
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