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1.1 ! root 1: ;; Incremental search ! 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: ; in loaddefs.el ! 22: ;(defvar search-last-string "" ! 23: ; "Last string search for by a search command. ! 24: ;This does not include direct calls to the primitive search functions, ! 25: ;and does not include searches that are aborted.") ! 26: ;(defvar search-last-regexp "" ! 27: ; "Last string searched for by a regexp search command. ! 28: ;This does not include direct calls to the primitive search functions, ! 29: ;and does not include searches that are aborted.") ! 30: ; ! 31: ;(defconst search-repeat-char ?\C-s ! 32: ; "Character to repeat incremental search forwards.") ! 33: ;(defconst search-reverse-char ?\C-r ! 34: ; "Character to repeat incremental search backwards.") ! 35: ;(defconst search-exit-char ?\e ! 36: ; "Character to exit incremental search.") ! 37: ;(defconst search-delete-char ?\177 ! 38: ; "Character to delete from incremental search string.") ! 39: ;(defconst search-quote-char ?\C-q ! 40: ; "Character to quote special characters for incremental search.") ! 41: ;(defconst search-yank-word-char ?\C-w ! 42: ; "Character to pull next word from buffer into search string.") ! 43: ;(defconst search-yank-line-char ?\C-y ! 44: ; "Character to pull rest of line from buffer into search string.") ! 45: ;(defconst search-exit-option t ! 46: ; "Non-nil means random control characters terminate incremental search.") ! 47: ; ! 48: ;(defvar search-slow-window-lines 1 ! 49: ; "*Number of lines in slow search display windows.") ! 50: ;(defconst search-slow-speed 1200 ! 51: ; "*Highest terminal speed at which to use \"slow\" style incremental search. ! 52: ;This is the style where a one-line window is created to show the line ! 53: ;that the search has reached.") ! 54: ! 55: ;; This function does all the work of incremental search. ! 56: ;; The functions attached to ^R and ^S are trivial, ! 57: ;; merely calling this one, but they are always loaded by default ! 58: ;; whereas this file can optionally be autoloadable. ! 59: ;; This is the only entry point in this file. ! 60: ! 61: (defun isearch (forward &optional regexp) ! 62: (let ((search-string "") ! 63: (search-message "") ! 64: (cmds nil) ! 65: (success t) ! 66: (wrapped nil) ! 67: (barrier (point)) ! 68: adjusted ! 69: (invalid-regexp nil) ! 70: (slow-terminal-mode (and (<= (baud-rate) search-slow-speed) ! 71: (> (window-height) ! 72: (* 4 search-slow-window-lines)))) ! 73: (other-end nil) ;Start of last match if fwd, end if backwd. ! 74: (small-window nil) ;if t, using a small window ! 75: (found-point nil) ;to restore point from a small window ! 76: ;; This is the window-start value found by the search. ! 77: (found-start nil) ! 78: (opoint (point)) ! 79: (inhibit-quit t)) ;Prevent ^G from quitting immediately. ! 80: (isearch-push-state) ! 81: (save-window-excursion ! 82: (catch 'search-done ! 83: (while t ! 84: (or (>= unread-command-char 0) ! 85: (progn ! 86: (or (input-pending-p) ! 87: (isearch-message)) ! 88: (if (and slow-terminal-mode ! 89: (not (or small-window (pos-visible-in-window-p)))) ! 90: (progn ! 91: (setq small-window t) ! 92: (setq found-point (point)) ! 93: (move-to-window-line 0) ! 94: (let ((window-min-height 1)) ! 95: (split-window nil (if (< search-slow-window-lines 0) ! 96: (1+ (- search-slow-window-lines)) ! 97: (- (window-height) ! 98: (1+ search-slow-window-lines))))) ! 99: (if (< search-slow-window-lines 0) ! 100: (progn (vertical-motion (- 1 search-slow-window-lines)) ! 101: (set-window-start (next-window) (point)) ! 102: (set-window-hscroll (next-window) ! 103: (window-hscroll)) ! 104: (set-window-hscroll (selected-window) 0)) ! 105: (other-window 1)) ! 106: (goto-char found-point))))) ! 107: (let ((char (if quit-flag ! 108: ?\C-g ! 109: (read-char)))) ! 110: (setq quit-flag nil adjusted nil) ! 111: ;; Meta character means exit search. ! 112: (cond ((and (>= char 128) ! 113: search-exit-option) ! 114: (setq unread-command-char char) ! 115: (throw 'search-done t)) ! 116: ((eq char search-exit-char) ! 117: ;; Esc means exit search normally. ! 118: ;; Except, if first thing typed, it means do nonincremental ! 119: (if (= 0 (length search-string)) ! 120: (nonincremental-search forward regexp)) ! 121: (throw 'search-done t)) ! 122: ((= char ?\C-g) ! 123: ;; ^G means the user tried to quit. ! 124: (ding) ! 125: (discard-input) ! 126: (if success ! 127: ;; If search is successful, move back to starting point ! 128: ;; and really do quit. ! 129: (progn (goto-char opoint) ! 130: (signal 'quit nil)) ! 131: ;; If search is failing, rub out until it is once more ! 132: ;; successful. ! 133: (while (not success) (isearch-pop)))) ! 134: ((or (eq char search-repeat-char) ! 135: (eq char search-reverse-char)) ! 136: (if (eq forward (eq char search-repeat-char)) ! 137: ;; C-s in forward or C-r in reverse. ! 138: (if (equal search-string "") ! 139: ;; If search string is empty, use last one. ! 140: (setq search-string ! 141: (if regexp ! 142: search-last-regexp search-last-string) ! 143: search-message ! 144: (mapconcat 'text-char-description ! 145: search-string "")) ! 146: ;; If already have what to search for, repeat it. ! 147: (or success ! 148: (progn (goto-char (if forward (point-min) (point-max))) ! 149: (setq wrapped t)))) ! 150: ;; C-s in reverse or C-r in forward, change direction. ! 151: (setq forward (not forward))) ! 152: (setq barrier (point)) ; For subsequent \| if regexp. ! 153: (setq success t) ! 154: (or (equal search-string "") ! 155: (isearch-search)) ! 156: (isearch-push-state)) ! 157: ((= char search-delete-char) ! 158: ;; Rubout means discard last input item and move point ! 159: ;; back. If buffer is empty, just beep. ! 160: (if (null (cdr cmds)) ! 161: (ding) ! 162: (isearch-pop))) ! 163: (t ! 164: (cond ((or (eq char search-yank-word-char) ! 165: (eq char search-yank-line-char)) ! 166: ;; ^W means gobble next word from buffer. ! 167: ;; ^Y means gobble rest of line from buffer. ! 168: (let ((word (save-excursion ! 169: (and (not forward) other-end ! 170: (goto-char other-end)) ! 171: (buffer-substring ! 172: (point) ! 173: (save-excursion ! 174: (if (eq char search-yank-line-char) ! 175: (end-of-line) ! 176: (forward-word 1)) ! 177: (point)))))) ! 178: (setq search-string (concat search-string word) ! 179: search-message ! 180: (concat search-message ! 181: (mapconcat 'text-char-description ! 182: word ""))))) ! 183: ;; Any other control char => ! 184: ;; unread it and exit the search normally. ! 185: ((and search-exit-option ! 186: (/= char search-quote-char) ! 187: (or (= char ?\177) ! 188: (and (< char ? ) (/= char ?\t) (/= char ?\r)))) ! 189: (setq unread-command-char char) ! 190: (throw 'search-done t)) ! 191: (t ! 192: ;; Any other character => add it to the ! 193: ;; search string and search. ! 194: (cond ((= char search-quote-char) ! 195: (setq char (read-quoted-char ! 196: (isearch-message t)))) ! 197: ((= char ?\r) ! 198: ;; unix braindeath ! 199: (setq char ?\n))) ! 200: (setq search-string (concat search-string ! 201: (char-to-string char)) ! 202: search-message (concat search-message ! 203: (text-char-description char))))) ! 204: (if (and (not success) ! 205: ;; unsuccessful regexp search may become ! 206: ;; successful by addition of characters which ! 207: ;; make search-string valid ! 208: (not regexp)) ! 209: nil ! 210: ;; If a regexp search may have been made more ! 211: ;; liberal, retreat the search start. ! 212: ;; Go back to place last successful search started ! 213: ;; or to the last ^S/^R (barrier), whichever is nearer. ! 214: (and regexp success cmds ! 215: (cond ((memq char '(?* ??)) ! 216: (setq adjusted t) ! 217: (let ((cs (nth (if forward ! 218: 5 ; other-end ! 219: 2) ; saved (point) ! 220: (car (cdr cmds))))) ! 221: ;; (car cmds) is after last search; ! 222: ;; (car (cdr cmds)) is from before it. ! 223: (setq cs (or cs barrier)) ! 224: (goto-char ! 225: (if forward ! 226: (max cs barrier) ! 227: (min cs barrier))))) ! 228: ((eq char ?\|) ! 229: (setq adjusted t) ! 230: (goto-char barrier)))) ! 231: ;; In reverse regexp search, adding a character at ! 232: ;; the end may cause zero or many more chars to be ! 233: ;; matched, in the string following point. ! 234: ;; Allow all those possibiities without moving point as ! 235: ;; long as the match does not extend past search origin. ! 236: (if (and regexp (not forward) (not adjusted) ! 237: (condition-case () ! 238: (looking-at search-string) ! 239: (error nil)) ! 240: (<= (match-end 0) (min opoint barrier))) ! 241: (setq success t invalid-regexp nil ! 242: other-end (match-end 0)) ! 243: ;; Not regexp, not reverse, or no match at point. ! 244: (if (and other-end (not adjusted)) ! 245: (goto-char (if forward other-end ! 246: (min opoint barrier (1+ other-end))))) ! 247: (isearch-search))) ! 248: (isearch-push-state)))))) ! 249: (setq found-start (window-start (selected-window))) ! 250: (setq found-point (point))) ! 251: (if (> (length search-string) 0) ! 252: (if regexp ! 253: (setq search-last-regexp search-string) ! 254: (setq search-last-string search-string))) ! 255: ;; If there was movement, mark the starting position. ! 256: ;; Maybe should test difference between and set mark iff > threshold. ! 257: (if (/= (point) opoint) ! 258: (push-mark opoint) ! 259: (message "")) ! 260: (if small-window ! 261: (goto-char found-point) ! 262: ;; Exiting the save-window-excursion clobbers this; restore it. ! 263: (set-window-start (selected-window) found-start t)))) ! 264: ! 265: (defun isearch-message (&optional c-q-hack ellipsis) ! 266: ;; If about to search, and previous search regexp was invalid, ! 267: ;; check that it still is. If it is valid now, ! 268: ;; let the message we display while searching say that it is valid. ! 269: (and invalid-regexp ellipsis ! 270: (condition-case () ! 271: (progn (re-search-forward search-string (point) t) ! 272: (setq invalid-regexp nil)) ! 273: (error nil))) ! 274: ;; If currently failing, display no ellipsis. ! 275: (or success (setq ellipsis nil)) ! 276: (let ((m (concat (if success "" "failing ") ! 277: (if wrapped "wrapped ") ! 278: (if regexp "regexp " "") ! 279: "I-search" ! 280: (if forward ": " " backward: ") ! 281: search-message ! 282: (if c-q-hack "^Q" "") ! 283: (if invalid-regexp ! 284: (concat " [" invalid-regexp "]") ! 285: "")))) ! 286: (aset m 0 (upcase (aref m 0))) ! 287: (let ((cursor-in-echo-area ellipsis)) ! 288: (if c-q-hack m (message "%s" m))))) ! 289: ! 290: (defun isearch-pop () ! 291: (setq cmds (cdr cmds)) ! 292: (let ((cmd (car cmds))) ! 293: (setq search-string (car cmd) ! 294: search-message (car (cdr cmd)) ! 295: success (nth 3 cmd) ! 296: forward (nth 4 cmd) ! 297: other-end (nth 5 cmd) ! 298: invalid-regexp (nth 6 cmd) ! 299: wrapped (nth 7 cmd) ! 300: barrier (nth 8 cmd)) ! 301: (goto-char (car (cdr (cdr cmd)))))) ! 302: ! 303: (defun isearch-push-state () ! 304: (setq cmds (cons (list search-string search-message (point) ! 305: success forward other-end invalid-regexp ! 306: wrapped barrier) ! 307: cmds))) ! 308: ! 309: (defun isearch-search () ! 310: (isearch-message nil t) ! 311: (condition-case lossage ! 312: (let ((inhibit-quit nil)) ! 313: (if regexp (setq invalid-regexp nil)) ! 314: (setq success ! 315: (funcall ! 316: (if regexp ! 317: (if forward 're-search-forward 're-search-backward) ! 318: (if forward 'search-forward 'search-backward)) ! 319: search-string nil t)) ! 320: (if success ! 321: (setq other-end ! 322: (if forward (match-beginning 0) (match-end 0))))) ! 323: (quit (setq unread-command-char ?\C-g) ! 324: (setq success nil)) ! 325: (invalid-regexp (setq invalid-regexp (car (cdr lossage))) ! 326: (if (string-match "\\`Premature \\|\\`Unmatched \\|\\`Invalid " ! 327: invalid-regexp) ! 328: (setq invalid-regexp "incomplete input")))) ! 329: (if success ! 330: nil ! 331: ;; Ding if failed this time after succeeding last time. ! 332: (and (nth 3 (car cmds)) ! 333: (ding)) ! 334: (goto-char (nth 2 (car cmds))))) ! 335: ! 336: ;; This is called from incremental-search ! 337: ;; if the first input character is the exit character. ! 338: ;; The interactive-arg-reader uses free variables `forward' and `regexp' ! 339: ;; which are bound by `incremental-search'. ! 340: ! 341: ;; We store the search string in `search-string' ! 342: ;; which has been bound already by `incremental-search' ! 343: ;; so that, when we exit, it is copied into `search-last-string'. ! 344: ! 345: (defun nonincremental-search (forward regexp) ! 346: (let (message char function string inhibit-quit ! 347: (cursor-in-echo-area t)) ! 348: ;; Prompt assuming not word search, ! 349: (setq message (if regexp ! 350: (if forward "Regexp search: " ! 351: "Regexp search backward: ") ! 352: (if forward "Search: " "Search backward: "))) ! 353: (message "%s" message) ! 354: ;; Read 1 char and switch to word search if it is ^W. ! 355: (setq char (read-char)) ! 356: (if (eq char search-yank-word-char) ! 357: (setq message (if forward "Word search: " "Word search backward: ")) ! 358: ;; Otherwise let that 1 char be part of the search string. ! 359: (setq unread-command-char char)) ! 360: (setq function ! 361: (if (eq char search-yank-word-char) ! 362: (if forward 'word-search-forward 'word-search-backward) ! 363: (if regexp ! 364: (if forward 're-search-forward 're-search-backward) ! 365: (if forward 'search-forward 'search-backward)))) ! 366: ;; Read the search string with corrected prompt. ! 367: (setq string (read-string message)) ! 368: ;; Empty means use default. ! 369: (if (= 0 (length string)) ! 370: (setq string search-last-string) ! 371: ;; Set last search string now so it is set even if we fail. ! 372: (setq search-last-string string)) ! 373: ;; Since we used the minibuffer, we should be available for redo. ! 374: (setq command-history (cons (list function string) command-history)) ! 375: ;; Go ahead and search. ! 376: (funcall function string)))
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