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1.1 root 1: ;; Dynamic abbreviation package for GNU Emacs.
2: ;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
3:
4: ;; This file is part of GNU Emacs.
5:
6: ;; GNU Emacs is free software; you can redistribute it and/or modify
7: ;; it under the terms of the GNU General Public License as published by
8: ;; the Free Software Foundation; either version 1, or (at your option)
9: ;; any later version.
10:
11: ;; GNU Emacs is distributed in the hope that it will be useful,
12: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: ;; GNU General Public License for more details.
15:
16: ;; You should have received a copy of the GNU General Public License
17: ;; along with GNU Emacs; see the file COPYING. If not, write to
18: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19:
20:
21: ; DABBREVS - "Dynamic abbreviations" hack, originally written by Don Morrison
22: ; for Twenex Emacs. Converted to mlisp by Russ Fish. Supports the table
23: ; feature to avoid hitting the same expansion on re-expand, and the search
24: ; size limit variable. Bugs fixed from the Twenex version are flagged by
25: ; comments starting with ;;; .
26: ;
27: ; converted to elisp by Spencer Thomas.
28: ; Thoroughly cleaned up by Richard Stallman.
29: ;
30: ; If anyone feels like hacking at it, Bob Keller (Keller@Utah-20) first
31: ; suggested the beast, and has some good ideas for its improvement, but
32: ; doesn?tknow TECO (the lucky devil...). One thing that should definitely
33: ; be done is adding the ability to search some other buffer(s) if you can?t
34: ; find the expansion you want in the current one.
35:
36: ;; (defun dabbrevs-help ()
37: ;; "Give help about dabbrevs."
38: ;; (interactive)
39: ;; (&info "emacs" "dabbrevs") ; Select the specific info node.
40: ;; )
41: (provide 'dabbrevs)
42:
43: (defvar dabbrevs-limit nil
44: "*Limits region searched by dabbrevs-expand to that many chars away (local).")
45: (make-variable-buffer-local 'dabbrevs-limit)
46:
47: (defvar dabbrevs-backward-only nil
48: "*If non-NIL, dabbrevs-expand only looks backwards.")
49:
50: ; State vars for dabbrevs-re-expand.
51: (defvar last-dabbrevs-table nil
52: "Table of expansions seen so far. (local)")
53: (make-variable-buffer-local 'last-dabbrevs-table)
54:
55: (defvar last-dabbrevs-abbreviation ""
56: "Last string we tried to expand. Buffer-local.")
57: (make-variable-buffer-local 'last-dabbrevs-abbreviation)
58:
59: (defvar last-dabbrevs-direction 0
60: "Direction of last dabbrevs search. (local)")
61: (make-variable-buffer-local 'last-dabbrevs-direction)
62:
63: (defvar last-dabbrevs-abbrev-location nil
64: "Location last abbreviation began (local).")
65: (make-variable-buffer-local 'last-dabbrevs-abbrev-location)
66:
67: (defvar last-dabbrevs-expansion nil
68: "Last expansion of an abbreviation. (local)")
69: (make-variable-buffer-local 'last-dabbrevs-expansion)
70:
71: (defvar last-dabbrevs-expansion-location nil
72: "Location the last expansion was found. (local)")
73: (make-variable-buffer-local 'last-dabbrevs-expansion-location)
74:
75: (defun dabbrev-expand (arg)
76: "Expand previous word \"dynamically\".
77: Expands to the most recent, preceding word for which this is a prefix.
78: If no suitable preceding word is found, words following point are considered.
79:
80: A positive prefix argument, N, says to take the Nth backward DISTINCT
81: possibility. A negative argument says search forward. The variable
82: dabbrev-backward-only may be used to limit the direction of search to
83: backward if set non-nil.
84:
85: If the cursor has not moved from the end of the previous expansion and
86: no argument is given, replace the previously-made expansion
87: with the next possible expansion not yet tried."
88: (interactive "*P")
89: (let (abbrev expansion old which loc n pattern
90: (do-case (and case-fold-search case-replace)))
91: ;; abbrev -- the abbrev to expand
92: ;; expansion -- the expansion found (eventually) or nil until then
93: ;; old -- the text currently in the buffer
94: ;; (the abbrev, or the previously-made expansion)
95: ;; loc -- place where expansion is found
96: ;; (to start search there for next expansion if requested later)
97: ;; do-case -- nil if should consider case significant.
98: (save-excursion
99: (if (and (null arg)
100: (eq last-command this-command)
101: last-dabbrevs-abbrev-location)
102: (progn
103: (setq abbrev last-dabbrevs-abbreviation)
104: (setq old last-dabbrevs-expansion)
105: (setq which last-dabbrevs-direction))
106: (setq which (if (null arg)
107: (if dabbrevs-backward-only 1 0)
108: (prefix-numeric-value arg)))
109: (setq loc (point))
110: (forward-word -1)
111: (setq last-dabbrevs-abbrev-location (point)) ; Original location.
112: (setq abbrev (buffer-substring (point) loc))
113: (setq old abbrev)
114: (setq last-dabbrevs-expansion-location nil)
115: (setq last-dabbrev-table nil)) ; Clear table of things seen.
116:
117: (setq pattern (concat "\\b" (regexp-quote abbrev) "\\(\\sw\\|\\s_\\)+"))
118: ;; Try looking backward unless inhibited.
119: (if (>= which 0)
120: (progn
121: (setq n (max 1 which))
122: (if last-dabbrevs-expansion-location
123: (goto-char last-dabbrevs-expansion-location))
124: (while (and (> n 0)
125: (setq expansion (dabbrevs-search pattern t do-case)))
126: (setq loc (point-marker))
127: (setq last-dabbrev-table (cons expansion last-dabbrev-table))
128: (setq n (1- n)))
129: (or expansion
130: (setq last-dabbrevs-expansion-location nil))
131: (setq last-dabbrevs-direction (min 1 which))))
132:
133: (if (and (<= which 0) (not expansion)) ; Then look forward.
134: (progn
135: (setq n (max 1 (- which)))
136: (if last-dabbrevs-expansion-location
137: (goto-char last-dabbrevs-expansion-location))
138: (while (and (> n 0)
139: (setq expansion (dabbrevs-search pattern nil do-case)))
140: (setq loc (point-marker))
141: (setq last-dabbrev-table (cons expansion last-dabbrev-table))
142: (setq n (1- n)))
143: (setq last-dabbrevs-direction -1))))
144:
145: (if (not expansion)
146: (let ((first (string= abbrev old)))
147: (setq last-dabbrevs-abbrev-location nil)
148: (if (not first)
149: (progn (undo-boundary)
150: (delete-backward-char (length old))
151: (insert abbrev)))
152: (error (if first
153: "No dynamic expansion for \"%s\" found."
154: "No further dynamic expansions for \"%s\" found.")
155: abbrev))
156: ;; Success: stick it in and return.
157: (undo-boundary)
158: (search-backward old)
159: ;; Make case of replacement conform to case of abbreviation
160: ;; provided (1) that kind of thing is enabled in this buffer
161: ;; and (2) the replacement itself is all lower case
162: ;; except perhaps for the first character.
163: (let ((do-case (and do-case
164: (string= (substring expansion 1)
165: (downcase (substring expansion 1))))))
166: ;; First put back the original abbreviation with its original
167: ;; case pattern.
168: (save-excursion
169: (replace-match abbrev t 'literal))
170: (search-forward abbrev)
171: (replace-match (if do-case (downcase expansion) expansion)
172: (not do-case)
173: 'literal))
174: ;; Save state for re-expand.
175: (setq last-dabbrevs-abbreviation abbrev)
176: (setq last-dabbrevs-expansion expansion)
177: (setq last-dabbrevs-expansion-location loc))))
178:
179: ;; Search function used by dabbrevs library.
180: ;; First arg is string to find as prefix of word. Second arg is
181: ;; t for reverse search, nil for forward. Variable dabbrevs-limit
182: ;; controls the maximum search region size.
183:
184: ;; Table of expansions already seen is examined in buffer last-dabbrev-table,
185: ;; so that only distinct possibilities are found by dabbrevs-re-expand.
186: ;; Note that to prevent finding the abbrev itself it must have been
187: ;; entered in the table.
188:
189: ;; Value is the expansion, or nil if not found. After a successful
190: ;; search, point is left right after the expansion found.
191:
192: (defun dabbrevs-search (pattern reverse do-case)
193: (let (missing result)
194: (save-restriction ; Uses restriction for limited searches.
195: (if dabbrevs-limit
196: (narrow-to-region last-dabbrevs-abbrev-location
197: (+ (point)
198: (* dabbrevs-limit (if reverse -1 1)))))
199: ;; Keep looking for a distinct expansion.
200: (setq result nil)
201: (setq missing nil)
202: (while (and (not result) (not missing))
203: ; Look for it, leave loop if search fails.
204: (setq missing
205: (not (if reverse
206: (re-search-backward pattern nil t)
207: (re-search-forward pattern nil t))))
208:
209: (if (not missing)
210: (progn
211: (setq result (buffer-substring (match-beginning 0)
212: (match-end 0)))
213: (let* ((test last-dabbrev-table))
214: (while (and test
215: (not
216: (if do-case
217: (string= (downcase (car test)) (downcase result))
218: (string= (car test) result))))
219: (setq test (cdr test)))
220: (if test (setq result nil)))))) ; if already in table, ignore
221: result)))
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