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