home *** CD-ROM | disk | FTP | other *** search
- ;;; sort.el --- commands to sort text in an Emacs buffer.
-
- ;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
-
- ;; Author: Howie Kaye
- ;; Maintainer: FSF
- ;; Keywords: unix
-
- ;; 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.
-
- ;;; Commentary:
-
- ;;; This package provides the sorting facilities documented in the Emacs
- ;;; user's manual.
-
- ;;; Code:
-
- (defvar sort-fold-case nil
- "*Non-nil if the buffer sort functions should ignore case.")
-
- (defun sort-subr (reverse nextrecfun endrecfun &optional startkeyfun endkeyfun)
- "General text sorting routine to divide buffer into records and sort them.
- Arguments are REVERSE NEXTRECFUN ENDRECFUN &optional STARTKEYFUN ENDKEYFUN.
-
- We divide the accessible portion of the buffer into disjoint pieces
- called sort records. A portion of each sort record (perhaps all of
- it) is designated as the sort key. The records are rearranged in the
- buffer in order by their sort keys. The records may or may not be
- contiguous.
-
- Usually the records are rearranged in order of ascending sort key.
- If REVERSE is non-nil, they are rearranged in order of descending sort key.
-
- The next four arguments are functions to be called to move point
- across a sort record. They will be called many times from within sort-subr.
-
- NEXTRECFUN is called with point at the end of the previous record.
- It moves point to the start of the next record.
- It should move point to the end of the buffer if there are no more records.
- The first record is assumed to start at the position of point when sort-subr
- is called.
-
- ENDRECFUN is called with point within the record.
- It should move point to the end of the record.
-
- STARTKEYFUN moves from the start of the record to the start of the key.
- It may return either a non-nil value to be used as the key, or
- else the key is the substring between the values of point after
- STARTKEYFUN and ENDKEYFUN are called. If STARTKEYFUN is nil, the key
- starts at the beginning of the record.
-
- ENDKEYFUN moves from the start of the sort key to the end of the sort key.
- ENDKEYFUN may be nil if STARTKEYFUN returns a value or if it would be the
- same as ENDRECFUN."
- ;; Heuristically try to avoid messages if sorting a small amt of text.
- (let ((messages (> (- (point-max) (point-min)) 50000)))
- (save-excursion
- (if messages (message "Finding sort keys..."))
- (let* ((sort-lists (sort-build-lists nextrecfun endrecfun
- startkeyfun endkeyfun))
- (old (reverse sort-lists))
- (case-fold-search sort-fold-case))
- (if (null sort-lists)
- ()
- (or reverse (setq sort-lists (nreverse sort-lists)))
- (if messages (message "Sorting records..."))
- (setq sort-lists
- (if (fboundp 'sortcar)
- (sortcar sort-lists
- (cond ((numberp (car (car sort-lists)))
- ;; This handles both ints and floats.
- '<)
- ((consp (car (car sort-lists)))
- (function
- (lambda (a b)
- (> 0 (compare-buffer-substrings
- nil (car a) (cdr a)
- nil (car b) (cdr b))))))
- (t
- 'string<)))
- (sort sort-lists
- (cond ((numberp (car (car sort-lists)))
- (function
- (lambda (a b)
- (< (car a) (car b)))))
- ((consp (car (car sort-lists)))
- (function
- (lambda (a b)
- (> 0 (compare-buffer-substrings
- nil (car (car a)) (cdr (car a))
- nil (car (car b)) (cdr (car b)))))))
- (t
- (function
- (lambda (a b)
- (string< (car a) (car b)))))))))
- (if reverse (setq sort-lists (nreverse sort-lists)))
- (if messages (message "Reordering buffer..."))
- (sort-reorder-buffer sort-lists old)))
- (if messages (message "Reordering buffer... Done"))))
- nil)
-
- ;; Parse buffer into records using the arguments as Lisp expressions;
- ;; return a list of records. Each record looks like (KEY STARTPOS . ENDPOS)
- ;; where KEY is the sort key (a number or string),
- ;; and STARTPOS and ENDPOS are the bounds of this record in the buffer.
-
- ;; The records appear in the list lastmost first!
-
- (defun sort-build-lists (nextrecfun endrecfun startkeyfun endkeyfun)
- (let ((sort-lists ())
- (start-rec nil)
- done key)
- ;; Loop over sort records.
- ;(goto-char (point-min)) -- it is the caller's responsibility to
- ;arrange this if necessary
- (while (not (eobp))
- (setq start-rec (point)) ;save record start
- (setq done nil)
- ;; Get key value, or move to start of key.
- (setq key (catch 'key
- (or (and startkeyfun (funcall startkeyfun))
- ;; If key was not returned as value,
- ;; move to end of key and get key from the buffer.
- (let ((start (point)))
- (funcall (or endkeyfun
- (prog1 endrecfun (setq done t))))
- (cons start (point))))))
- ;; Move to end of this record (start of next one, or end of buffer).
- (cond ((prog1 done (setq done nil)))
- (endrecfun (funcall endrecfun))
- (nextrecfun (funcall nextrecfun) (setq done t)))
- (if key (setq sort-lists (cons
- ;; consing optimization in case in which key
- ;; is same as record.
- (if (and (consp key)
- (equal (car key) start-rec)
- (equal (cdr key) (point)))
- (cons key key)
- (cons key (cons start-rec (point))))
- sort-lists)))
- (and (not done) nextrecfun (funcall nextrecfun)))
- sort-lists))
-
- (defun sort-reorder-buffer (sort-lists old)
- (let ((inhibit-quit t)
- (last (point-min))
- (min (point-min)) (max (point-max)))
- ;; Make sure insertions done for reordering
- ;; do not go after any markers at the end of the sorted region,
- ;; by inserting a space to separate them.
- (goto-char (point-max))
- (insert-before-markers " ")
- (narrow-to-region min (1- (point-max)))
- (while sort-lists
- (goto-char (point-max))
- (insert-buffer-substring (current-buffer)
- last
- (nth 1 (car old)))
- (goto-char (point-max))
- (insert-buffer-substring (current-buffer)
- (nth 1 (car sort-lists))
- (cdr (cdr (car sort-lists))))
- (setq last (cdr (cdr (car old)))
- sort-lists (cdr sort-lists)
- old (cdr old)))
- (goto-char (point-max))
- (insert-buffer-substring (current-buffer)
- last
- max)
- ;; Delete the original copy of the text.
- (delete-region min max)
- ;; Get rid of the separator " ".
- (goto-char (point-max))
- (narrow-to-region min (1+ (point)))
- (delete-region (point) (1+ (point)))))
-
- ;;;###autoload
- (defun sort-lines (reverse beg end)
- "Sort lines in region alphabetically; argument means descending order.
- Called from a program, there are three arguments:
- REVERSE (non-nil means reverse order), BEG and END (region to sort)."
- (interactive "P\nr")
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (sort-subr reverse 'forward-line 'end-of-line))))
-
- ;;;###autoload
- (defun sort-paragraphs (reverse beg end)
- "Sort paragraphs in region alphabetically; argument means descending order.
- Called from a program, there are three arguments:
- REVERSE (non-nil means reverse order), BEG and END (region to sort)."
- (interactive "P\nr")
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (sort-subr reverse
- (function (lambda () (skip-chars-forward "\n \t\f")))
- 'forward-paragraph))))
-
- ;;;###autoload
- (defun sort-pages (reverse beg end)
- "Sort pages in region alphabetically; argument means descending order.
- Called from a program, there are three arguments:
- REVERSE (non-nil means reverse order), BEG and END (region to sort)."
- (interactive "P\nr")
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (sort-subr reverse
- (function (lambda () (skip-chars-forward "\n")))
- 'forward-page))))
-
- (defvar sort-fields-syntax-table nil)
- (if sort-fields-syntax-table nil
- (let ((table (make-syntax-table))
- (i 0))
- (while (< i 256)
- (modify-syntax-entry i "w" table)
- (setq i (1+ i)))
- (modify-syntax-entry ?\ " " table)
- (modify-syntax-entry ?\t " " table)
- (modify-syntax-entry ?\n " " table)
- (modify-syntax-entry ?\. "_" table) ; for floating pt. numbers. -wsr
- (setq sort-fields-syntax-table table)))
-
- ;;;###autoload
- (defun sort-numeric-fields (field beg end)
- "Sort lines in region numerically by the ARGth field of each line.
- Fields are separated by whitespace and numbered from 1 up.
- Specified field must contain a number in each line of the region.
- With a negative arg, sorts by the ARGth field counted from the right.
- Called from a program, there are three arguments:
- FIELD, BEG and END. BEG and END specify region to sort.
- If you want to sort floating-point numbers, try `sort-float-fields'."
- (interactive "p\nr")
- (sort-fields-1 field beg end
- (function (lambda ()
- (sort-skip-fields (1- field))
- (string-to-number
- (buffer-substring
- (point)
- (save-excursion
- ;; This is just wrong! Even without floats...
- ;; (skip-chars-forward "[0-9]")
- (forward-sexp 1)
- (point))))))
- nil))
-
- ;;;###autoload
- (defun sort-float-fields (field beg end)
- "Sort lines in region numerically by the ARGth field of each line.
- Fields are separated by whitespace and numbered from 1 up. Specified field
- must contain a floating point number in each line of the region. With a
- negative arg, sorts by the ARGth field counted from the right. Called from a
- program, there are three arguments: FIELD, BEG and END. BEG and END specify
- region to sort."
- (interactive "p\nr")
- (sort-fields-1 field beg end
- (function (lambda ()
- (sort-skip-fields (1- field))
- (string-to-number
- (buffer-substring
- (point)
- (save-excursion
- (re-search-forward
- "[+-]?[0-9]*\.?[0-9]*\\([eE][+-]?[0-9]+\\)?")
- (point))))))
- nil))
-
- ;;;###autoload
- (defun sort-fields (field beg end)
- "Sort lines in region lexicographically by the ARGth field of each line.
- Fields are separated by whitespace and numbered from 1 up.
- With a negative arg, sorts by the ARGth field counted from the right.
- Called from a program, there are three arguments:
- FIELD, BEG and END. BEG and END specify region to sort."
- (interactive "p\nr")
- (sort-fields-1 field beg end
- (function (lambda ()
- (sort-skip-fields (1- field))
- nil))
- (function (lambda () (skip-chars-forward "^ \t\n")))))
-
- (defun sort-fields-1 (field beg end startkeyfun endkeyfun)
- (let ((tbl (syntax-table)))
- (if (zerop field) (setq field 1))
- (unwind-protect
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (set-syntax-table sort-fields-syntax-table)
- (sort-subr nil
- 'forward-line 'end-of-line
- startkeyfun endkeyfun)))
- (set-syntax-table tbl))))
-
- (defun sort-skip-fields (n)
- (let ((bol (point))
- (eol (save-excursion (end-of-line 1) (point))))
- (if (> n 0) (forward-word n)
- (end-of-line)
- (forward-word (1+ n)))
- (if (or (and (>= (point) eol) (> n 0))
- ;; this is marginally wrong; if the first line of the sort
- ;; at bob has the wrong number of fields the error won't be
- ;; reported until the next short line.
- (and (< (point) bol) (< n 0)))
- (error "Line has too few fields: %s"
- (buffer-substring bol eol)))
- (skip-chars-forward " \t")))
-
-
- ;;;###autoload
- (defun sort-regexp-fields (reverse record-regexp key-regexp beg end)
- "Sort the region lexicographically as specified by RECORD-REGEXP and KEY.
- RECORD-REGEXP specifies the textual units which should be sorted.
- For example, to sort lines RECORD-REGEXP would be \"^.*$\"
- KEY specifies the part of each record (ie each match for RECORD-REGEXP)
- is to be used for sorting.
- If it is \"\\digit\" then the digit'th \"\\(...\\)\" match field from
- RECORD-REGEXP is used.
- If it is \"\\&\" then the whole record is used.
- Otherwise, it is a regular-expression for which to search within the record.
- If a match for KEY is not found within a record then that record is ignored.
-
- With a negative prefix arg sorts in reverse order.
-
- For example: to sort lines in the region by the first word on each line
- starting with the letter \"f\",
- RECORD-REGEXP would be \"^.*$\" and KEY would be \"\\=\\<f\\w*\\>\""
- ;; using negative prefix arg to mean "reverse" is now inconsistent with
- ;; other sort-.*fields functions but then again this was before, since it
- ;; didn't use the magnitude of the arg to specify anything.
- (interactive "P\nsRegexp specifying records to sort:
- sRegexp specifying key within record: \nr")
- (cond ((or (equal key-regexp "") (equal key-regexp "\\&"))
- (setq key-regexp 0))
- ((string-match "\\`\\\\[1-9]\\'" key-regexp)
- (setq key-regexp (- (aref key-regexp 1) ?0))))
- (save-excursion
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (let (sort-regexp-record-end) ;isn't dynamic scoping wonderful?
- (re-search-forward record-regexp)
- (setq sort-regexp-record-end (point))
- (goto-char (match-beginning 0))
- (sort-subr reverse
- (function (lambda ()
- (and (re-search-forward record-regexp nil 'move)
- (setq sort-regexp-record-end (match-end 0))
- (goto-char (match-beginning 0)))))
- (function (lambda ()
- (goto-char sort-regexp-record-end)))
- (function (lambda ()
- (let ((n 0))
- (cond ((numberp key-regexp)
- (setq n key-regexp))
- ((re-search-forward
- key-regexp sort-regexp-record-end t)
- (setq n 0))
- (t (throw 'key nil)))
- (condition-case ()
- (if (fboundp 'buffer-substring-lessp)
- (cons (match-beginning n)
- (match-end n))
- (buffer-substring (match-beginning n)
- (match-end n)))
- ;; if there was no such register
- (error (throw 'key nil)))))))))))
-
-
- (defvar sort-columns-subprocess t)
-
- ;;;###autoload
- (defun sort-columns (reverse &optional beg end)
- "Sort lines in region alphabetically by a certain range of columns.
- For the purpose of this command, the region includes
- the entire line that point is in and the entire line the mark is in.
- The column positions of point and mark bound the range of columns to sort on.
- A prefix argument means sort into reverse order.
-
- Note that `sort-columns' rejects text that contains tabs,
- because tabs could be split across the specified columns
- and it doesn't know how to handle that. Also, when possible,
- it uses the `sort' utility program, which doesn't understand tabs.
- Use \\[untabify] to convert tabs to spaces before sorting."
- (interactive "P\nr")
- (save-excursion
- (let (beg1 end1 col-beg1 col-end1 col-start col-end)
- (goto-char (min beg end))
- (setq col-beg1 (current-column))
- (beginning-of-line)
- (setq beg1 (point))
- (goto-char (max beg end))
- (setq col-end1 (current-column))
- (forward-line)
- (setq end1 (point))
- (setq col-start (min col-beg1 col-end1))
- (setq col-end (max col-beg1 col-end1))
- (if (search-backward "\t" beg1 t)
- (error "sort-columns does not work with tabs. Use M-x untabify."))
- (if (not (eq system-type 'vax-vms))
- ;; Use the sort utility if we can; it is 4 times as fast.
- (call-process-region beg1 end1 "sort" t t nil
- (if reverse "-rt\n" "-t\n")
- (concat "+0." col-start)
- (concat "-0." col-end))
- ;; On VMS, use Emacs's own facilities.
- (save-excursion
- (save-restriction
- (narrow-to-region beg1 end1)
- (goto-char beg1)
- (sort-subr reverse 'forward-line 'end-of-line
- (function (lambda () (move-to-column col-start) nil))
- (function (lambda () (move-to-column col-end) nil)))))))))
-
- ;;;###autoload
- (defun reverse-region (beg end)
- "Reverse the order of lines in a region.
- From a program takes two point or marker arguments, BEG and END."
- (interactive "r")
- (if (> beg end)
- (let (mid) (setq mid end end beg beg mid)))
- (save-excursion
- ;; put beg at the start of a line and end and the end of one --
- ;; the largest possible region which fits this criteria
- (goto-char beg)
- (or (bolp) (forward-line 1))
- (setq beg (point))
- (goto-char end)
- ;; the test for bolp is for those times when end is on an empty line;
- ;; it is probably not the case that the line should be included in the
- ;; reversal; it isn't difficult to add it afterward.
- (or (and (eolp) (not (bolp))) (progn (forward-line -1) (end-of-line)))
- (setq end (point-marker))
- ;; the real work. this thing cranks through memory on large regions.
- (let (ll (do t))
- (while do
- (goto-char beg)
- (setq ll (cons (buffer-substring (point) (progn (end-of-line) (point)))
- ll))
- (setq do (/= (point) end))
- (delete-region beg (if do (1+ (point)) (point))))
- (while (cdr ll)
- (insert (car ll) "\n")
- (setq ll (cdr ll)))
- (insert (car ll)))))
-
- (provide 'sort)
-
- ;;; sort.el ends here
-