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280 lines
10 KiB
EmacsLisp
280 lines
10 KiB
EmacsLisp
;;; dabbrev.el --- dynamic abbreviation package for GNU Emacs.
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;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
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;; Last-Modified: 16 Mar 1992
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;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: abbrev
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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
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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; DABBREVS - "Dynamic abbreviations" hack, originally written by Don Morrison
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; for Twenex Emacs. Converted to mlisp by Russ Fish. Supports the table
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; feature to avoid hitting the same expansion on re-expand, and the search
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; size limit variable. Bugs fixed from the Twenex version are flagged by
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; comments starting with ;;; .
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;
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; converted to Emacs Lisp by Spencer Thomas.
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; Thoroughly cleaned up by Richard Stallman.
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;
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; If anyone feels like hacking at it, Bob Keller (Keller@Utah-20) first
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; suggested the beast, and has some good ideas for its improvement, but
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; doesn't know TECO (the lucky devil...). One thing that should definitely
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; be done is adding the ability to search some other buffer(s) if you can?t
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; find the expansion you want in the current one.
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;;; Code:
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;; (defun dabbrevs-help ()
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;; "Give help about dabbrevs."
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;; (interactive)
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;; (&info "emacs" "dabbrevs") ; Select the specific info node.
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;; )
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(defvar dabbrevs-limit nil
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"*Limits region searched by `dabbrevs-expand' to this many chars away.")
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(make-variable-buffer-local 'dabbrevs-limit)
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(defvar dabbrevs-backward-only nil
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"*If non-NIL, `dabbrevs-expand' only looks backwards.")
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; State vars for dabbrevs-re-expand.
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(defvar last-dabbrevs-table nil
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"Table of expansions seen so far (local)")
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(make-variable-buffer-local 'last-dabbrevs-table)
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(defvar last-dabbrevs-abbreviation ""
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"Last string we tried to expand (local).")
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(make-variable-buffer-local 'last-dabbrevs-abbreviation)
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(defvar last-dabbrevs-direction 0
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"Direction of last dabbrevs search (local)")
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(make-variable-buffer-local 'last-dabbrevs-direction)
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(defvar last-dabbrevs-abbrev-location nil
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"Location last abbreviation began (local).")
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(make-variable-buffer-local 'last-dabbrevs-abbrev-location)
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(defvar last-dabbrevs-expansion nil
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"Last expansion of an abbreviation. (local)")
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(make-variable-buffer-local 'last-dabbrevs-expansion)
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(defvar last-dabbrevs-expansion-location nil
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"Location the last expansion was found. (local)")
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(make-variable-buffer-local 'last-dabbrevs-expansion-location)
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;;;###autoload
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(defun dabbrev-expand (arg)
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"Expand previous word \"dynamically\".
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Expands to the most recent, preceding word for which this is a prefix.
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If no suitable preceding word is found, words following point are considered.
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If `case-fold-search' and `case-replace' are non-nil (usually true)
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then the substituted word may be case-adjusted to match the abbreviation
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that you had typed. This takes place if the substituted word, as found,
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is all lower case, or if it is at the beginning of a sentence and only
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its first letter was upper case.
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A positive prefix arg N says to take the Nth backward DISTINCT
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possibility. A negative argument says search forward. The variable
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`dabbrev-backward-only' may be used to limit the direction of search to
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backward if set non-nil.
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If the cursor has not moved from the end of the previous expansion and
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no argument is given, replace the previously-made expansion
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with the next possible expansion not yet tried."
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(interactive "*P")
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(let (abbrev expansion old which loc n pattern
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(do-case (and case-fold-search case-replace)))
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;; abbrev -- the abbrev to expand
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;; expansion -- the expansion found (eventually) or nil until then
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;; old -- the text currently in the buffer
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;; (the abbrev, or the previously-made expansion)
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;; loc -- place where expansion is found
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;; (to start search there for next expansion if requested later)
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;; do-case -- non-nil if should transform case when substituting.
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(save-excursion
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(if (and (null arg)
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(eq last-command this-command)
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last-dabbrevs-abbrev-location)
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(progn
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(setq abbrev last-dabbrevs-abbreviation)
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(setq old last-dabbrevs-expansion)
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(setq which last-dabbrevs-direction))
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(setq which (if (null arg)
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(if dabbrevs-backward-only 1 0)
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(prefix-numeric-value arg)))
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(setq loc (point))
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(forward-word -1)
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(setq last-dabbrevs-abbrev-location (point)) ; Original location.
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(setq abbrev (buffer-substring (point) loc))
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(setq old abbrev)
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(setq last-dabbrevs-expansion-location nil)
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(setq last-dabbrev-table nil)) ; Clear table of things seen.
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(setq pattern (concat "\\b" (regexp-quote abbrev) "\\(\\sw\\|\\s_\\)+"))
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;; Try looking backward unless inhibited.
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(if (>= which 0)
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(progn
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(setq n (max 1 which))
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(if last-dabbrevs-expansion-location
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(goto-char last-dabbrevs-expansion-location))
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(while (and (> n 0)
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(setq expansion (dabbrevs-search pattern t do-case)))
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(setq loc (point-marker))
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(setq last-dabbrev-table (cons expansion last-dabbrev-table))
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(setq n (1- n)))
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(or expansion
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(setq last-dabbrevs-expansion-location nil))
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(setq last-dabbrevs-direction (min 1 which))))
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(if (and (<= which 0) (not expansion)) ; Then look forward.
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(progn
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(setq n (max 1 (- which)))
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(if last-dabbrevs-expansion-location
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(goto-char last-dabbrevs-expansion-location))
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(while (and (> n 0)
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(setq expansion (dabbrevs-search pattern nil do-case)))
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(setq loc (point-marker))
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(setq last-dabbrev-table (cons expansion last-dabbrev-table))
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(setq n (1- n)))
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(setq last-dabbrevs-direction -1))))
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(if (not expansion)
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(let ((first (string= abbrev old)))
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(setq last-dabbrevs-abbrev-location nil)
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(if (not first)
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(progn (undo-boundary)
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(search-backward old)
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(if (eq major-mode 'picture-mode)
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(picture-replace-match abbrev t 'literal)
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(replace-match abbrev t 'literal))))
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(error (if first
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"No dynamic expansion for \"%s\" found."
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"No further dynamic expansions for \"%s\" found.")
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abbrev))
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;; Success: stick it in and return.
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(undo-boundary)
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(search-backward old)
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;; Make case of replacement conform to case of abbreviation
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;; provided (1) that kind of thing is enabled in this buffer
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;; and (2) the replacement itself is all lower case.
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;; First put back the original abbreviation with its original
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;; case pattern.
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(save-excursion
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(if (eq major-mode 'picture-mode)
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(picture-replace-match abbrev t 'literal)
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(replace-match abbrev t 'literal)))
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(search-forward abbrev)
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(let ((do-case (and do-case
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(string= (substring expansion 1)
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(downcase (substring expansion 1))))))
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;; First put back the original abbreviation with its original
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;; case pattern.
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(save-excursion
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(replace-match abbrev t 'literal))
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;;; This used to be necessary, but no longer,
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;;; because now point is preserved correctly above.
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;;; (search-forward abbrev)
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(if (eq major-mode 'picture-mode)
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(picture-replace-match (if do-case (downcase expansion) expansion)
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(not do-case)
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'literal)
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(replace-match (if do-case (downcase expansion) expansion)
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(not do-case)
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'literal)))
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;; Save state for re-expand.
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(setq last-dabbrevs-abbreviation abbrev)
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(setq last-dabbrevs-expansion expansion)
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(setq last-dabbrevs-expansion-location loc))))
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;;;###autoload (define-key esc-map "/" 'dabbrev-expand)
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;; Search function used by dabbrevs library.
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;; First arg is string to find as prefix of word. Second arg is
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;; t for reverse search, nil for forward. Variable dabbrevs-limit
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;; controls the maximum search region size.
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;; Table of expansions already seen is examined in buffer last-dabbrev-table,
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;; so that only distinct possibilities are found by dabbrevs-re-expand.
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;; Note that to prevent finding the abbrev itself it must have been
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;; entered in the table.
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;; IGNORE-CASE non-nil means treat case as insignificant while
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;; looking for a match and when comparing with previous matches.
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;; Also if that's non-nil and the match is found at the beginning of a sentence
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;; and is in lower case except for the initial
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;; then it is converted to all lower case for return.
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;; Value is the expansion, or nil if not found. After a successful
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;; search, point is left right after the expansion found.
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(defun dabbrevs-search (pattern reverse ignore-case)
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(let (missing result (case-fold-search ignore-case))
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(save-restriction ; Uses restriction for limited searches.
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(if dabbrevs-limit
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(narrow-to-region last-dabbrevs-abbrev-location
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(+ (point)
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(* dabbrevs-limit (if reverse -1 1)))))
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;; Keep looking for a distinct expansion.
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(setq result nil)
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(setq missing nil)
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(while (and (not result) (not missing))
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; Look for it, leave loop if search fails.
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(setq missing
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(not (if reverse
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(re-search-backward pattern nil t)
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(re-search-forward pattern nil t))))
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(if (not missing)
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(progn
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(setq result (buffer-substring (match-beginning 0)
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(match-end 0)))
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(let* ((test last-dabbrev-table))
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(while (and test
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(not
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(if ignore-case
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(string= (downcase (car test))
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(downcase result))
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(string= (car test) result))))
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(setq test (cdr test)))
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(if test (setq result nil)))))) ; if already in table, ignore
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(if result
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(save-excursion
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(let ((beg (match-beginning 0)))
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(goto-char beg)
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(and ignore-case
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(string= (substring result 1)
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(downcase (substring result 1)))
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(if (string= paragraph-start
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(concat "^$\\|" page-delimiter))
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(and (re-search-backward sentence-end nil t)
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(= (match-end 0) beg))
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(forward-char 1)
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(backward-sentence)
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(= (point) beg))
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(setq result (downcase result))))))
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result)))
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(provide 'dabbrev)
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;;; dabbrev.el ends here
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