/[cmucl]/src/hemlock/htext2.lisp
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Contents of /src/hemlock/htext2.lisp

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Revision 1.1.1.2 - (show annotations) (vendor branch)
Fri Feb 8 16:35:07 1991 UTC (23 years, 2 months ago) by ram
Changes since 1.1.1.1: +8 -5 lines
Added new header with RCS FILE-COMMENT.
1 ;;; -*- Log: hemlock.log; Package: Hemlock-Internals -*-
2 ;;;
3 ;;; **********************************************************************
4 ;;; This code was written as part of the CMU Common Lisp project at
5 ;;; Carnegie Mellon University, and has been placed in the public domain.
6 ;;; If you want to use this code or any part of CMU Common Lisp, please contact
7 ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
8 ;;;
9 (ext:file-comment
10 "$Header: /tiger/var/lib/cvsroots/cmucl/src/hemlock/htext2.lisp,v 1.1.1.2 1991/02/08 16:35:07 ram Exp $")
11 ;;;
12 ;;; **********************************************************************
13 ;;;
14 ;;; More Hemlock Text-Manipulation functions.
15 ;;; Written by Skef Wholey.
16 ;;;
17 ;;; The code in this file implements the non-insert/delete functions in the
18 ;;; "Doing Stuff and Going Places" chapter of the Hemlock Design document.
19 ;;;
20
21 (in-package "HEMLOCK-INTERNALS")
22
23 (export '(region-to-string string-to-region line-to-region
24 previous-character next-character count-lines
25 count-characters line-start line-end buffer-start
26 buffer-end move-mark mark-before mark-after
27 character-offset line-offset region-bounds
28 set-region-bounds *print-region*))
29
30
31
32 (defun region-to-string (region)
33 "Returns a string containing the characters in the given Region."
34 (close-line)
35 (let* ((dst-length (count-characters region))
36 (string (make-string dst-length))
37 (start-mark (region-start region))
38 (end-mark (region-end region))
39 (start-line (mark-line start-mark))
40 (end-line (mark-line end-mark))
41 (start-charpos (mark-charpos start-mark)))
42 (declare (simple-string string))
43 (if (eq start-line end-line)
44 (%sp-byte-blt (line-chars start-line) start-charpos string 0
45 dst-length)
46 (let ((index ()))
47 (let* ((line-chars (line-chars start-line))
48 (dst-end (- (length line-chars) start-charpos)))
49 (declare (simple-string line-chars))
50 (%sp-byte-blt line-chars start-charpos string 0 dst-end)
51 (setf (char string dst-end) #\newline)
52 (setq index (1+ dst-end)))
53 (do* ((line (line-next start-line) (line-next line))
54 (chars (line-chars line) (line-chars line)))
55 ((eq line end-line)
56 (%sp-byte-blt (line-chars line) 0 string index dst-length))
57 (declare (simple-string chars))
58 (%sp-byte-blt (line-chars line) 0 string index
59 (incf index (length chars)))
60 (setf (char string index) #\newline)
61 (setq index (1+ index)))))
62 string))
63
64 (defun string-to-region (string)
65 "Returns a region containing the characters in the given String."
66 (let* ((string (if (simple-string-p string)
67 string (coerce string 'simple-string)))
68 (end (length string)))
69 (declare (simple-string string))
70 (do* ((index 0)
71 (buffer (incf *disembodied-buffer-counter*))
72 (previous-line)
73 (line (make-line :%buffer buffer))
74 (first-line line))
75 (())
76 (let ((right-index (%sp-find-character string index end #\newline)))
77 (cond (right-index
78 (let* ((length (- right-index index))
79 (chars (make-string length)))
80 (%sp-byte-blt string index chars 0 length)
81 (setf (line-chars line) chars))
82 (setq index (1+ right-index))
83 (setq previous-line line)
84 (setq line (make-line :%buffer buffer))
85 (setf (line-next previous-line) line)
86 (setf (line-previous line) previous-line))
87 (t
88 (let* ((length (- end index))
89 (chars (make-string length)))
90 (%sp-byte-blt string index chars 0 length)
91 (setf (line-chars line) chars))
92 (return (renumber-region
93 (internal-make-region
94 (mark first-line 0 :right-inserting)
95 (mark line (length (line-chars line))
96 :left-inserting))))))))))
97
98 (defun line-to-region (line)
99 "Returns a region containing the specified line."
100 (internal-make-region (mark line 0 :right-inserting)
101 (mark line (line-length* line) :left-inserting)))
102
103 (defun previous-character (mark)
104 "Returns the character immediately before the given Mark."
105 (let ((line (mark-line mark))
106 (charpos (mark-charpos mark)))
107 (if (= charpos 0)
108 (if (line-previous line)
109 #\newline
110 nil)
111 (if (eq line open-line)
112 (char (the simple-string open-chars)
113 (if (<= charpos left-open-pos)
114 (1- charpos)
115 (1- (+ right-open-pos (- charpos left-open-pos)))))
116 (schar (line-chars line) (1- charpos))))))
117
118 (defun next-character (mark)
119 "Returns the character immediately after the given Mark."
120 (let ((line (mark-line mark))
121 (charpos (mark-charpos mark)))
122 (if (eq line open-line)
123 (if (= charpos (- line-cache-length (- right-open-pos left-open-pos)))
124 (if (line-next line)
125 #\newline
126 nil)
127 (schar open-chars
128 (if (< charpos left-open-pos)
129 charpos
130 (+ right-open-pos (- charpos left-open-pos)))))
131 (let ((chars (line-chars line)))
132 (if (= charpos (strlen chars))
133 (if (line-next line)
134 #\newline
135 nil)
136 (schar chars charpos))))))
137
138 ;;; %Set-Next-Character -- Internal
139 ;;;
140 ;;; This is the setf form for Next-Character. Since we may change a
141 ;;; character to or from a newline, we must be prepared to split and
142 ;;; join lines. We cannot just delete a character and insert the new one
143 ;;; because the marks would not be right.
144 ;;;
145 (defun %set-next-character (mark character)
146 (let* ((line (mark-line mark))
147 (buffer (line-%buffer line))
148 (next (line-next line)))
149 (modifying-buffer buffer
150 (modifying-line line mark)
151 (cond ((= right-open-pos line-cache-length)
152 ;; The mark is at the end of the line.
153 (unless next
154 (error "~S has no next character, so it cannot be set." mark))
155 (unless (char= character #\newline)
156 ;; If the character is no longer a newline then mash two
157 ;; lines together.
158 (let ((chars (line-chars next)))
159 (declare (simple-string chars))
160 (setq right-open-pos (- line-cache-length (length chars)))
161 (when (<= right-open-pos left-open-pos)
162 (grow-open-chars (* (+ (length chars) left-open-pos 1) 2)))
163 (%sp-byte-blt chars 0 open-chars right-open-pos
164 line-cache-length)
165 (setf (schar open-chars left-open-pos) character)
166 (incf left-open-pos))
167 (move-some-marks (charpos next line)
168 (+ charpos left-open-pos))
169 (setq next (line-next next))
170 (setf (line-next line) next)
171 (when next (setf (line-previous next) line))))
172 ((char= character #\newline)
173 ;; The char is being changed to a newline, so we must split lines.
174 (incf right-open-pos)
175 (let* ((len (- line-cache-length right-open-pos))
176 (chars (make-string len))
177 (new (make-line :chars chars :previous line
178 :next next :%buffer buffer)))
179 (%sp-byte-blt open-chars right-open-pos chars 0 len)
180 (maybe-move-some-marks* (charpos line new) left-open-pos
181 (- charpos left-open-pos 1))
182 (setf (line-next line) new)
183 (when next (setf (line-previous next) new))
184 (setq right-open-pos line-cache-length)
185 (number-line new)))
186 (t
187 (setf (char (the simple-string open-chars) right-open-pos)
188 character)))))
189 character)
190
191 ;;; %Set-Previous-Character -- Internal
192 ;;;
193 ;;; The setf form for Previous-Character. We just Temporarily move the
194 ;;; mark back one and call %Set-Next-Character.
195 ;;;
196 (defun %set-previous-character (mark character)
197 (unless (mark-before mark)
198 (error "~S has no previous character, so it cannot be set." mark))
199 (%set-next-character mark character)
200 (mark-after mark)
201 character)
202
203 (defun count-lines (region)
204 "Returns the number of lines in the region, first and last lines inclusive."
205 (do ((line (mark-line (region-start region)) (line-next line))
206 (count 1 (1+ count))
207 (last-line (mark-line (region-end region))))
208 ((eq line last-line) count)))
209
210 (defun count-characters (region)
211 "Returns the number of characters in the region."
212 (let* ((start (region-start region))
213 (end (region-end region))
214 (first-line (mark-line start))
215 (last-line (mark-line end)))
216 (if (eq first-line last-line)
217 (- (mark-charpos end) (mark-charpos start))
218 (do ((line (line-next first-line) (line-next line))
219 (count (1+ (- (line-length* first-line) (mark-charpos start)))))
220 ((eq line last-line)
221 (+ count (mark-charpos end)))
222 (setq count (+ 1 count (line-length* line)))))))
223
224 (defun line-start (mark &optional line)
225 "Changes the Mark to point to the beginning of the Line and returns it.
226 Line defaults to the line Mark is on."
227 (when line
228 (change-line mark line))
229 (setf (mark-charpos mark) 0)
230 mark)
231
232 (defun line-end (mark &optional line)
233 "Changes the Mark to point to the end of the line and returns it.
234 Line defaults to the line Mark is on."
235 (if line
236 (change-line mark line)
237 (setq line (mark-line mark)))
238 (setf (mark-charpos mark) (line-length* line))
239 mark)
240
241 (defun buffer-start (mark &optional (buffer (line-buffer (mark-line mark))))
242 "Change Mark to point to the beginning of Buffer, which defaults to
243 the buffer Mark is currently in."
244 (unless buffer (error "Mark ~S does not point into a buffer."))
245 (move-mark mark (buffer-start-mark buffer)))
246
247 (defun buffer-end (mark &optional (buffer (line-buffer (mark-line mark))))
248 "Change Mark to point to the end of Buffer, which defaults to
249 the buffer Mark is currently in."
250 (unless buffer (error "Mark ~S does not point into a buffer."))
251 (move-mark mark (buffer-end-mark buffer)))
252
253 (defun move-mark (mark new-position)
254 "Changes the Mark to point to the same position as New-Position."
255 (let ((line (mark-line new-position)))
256 (change-line mark line))
257 (setf (mark-charpos mark) (mark-charpos new-position))
258 mark)
259
260 (defun mark-before (mark)
261 "Changes the Mark to point one character before where it currently points.
262 NIL is returned if there is no previous character."
263 (let ((charpos (mark-charpos mark)))
264 (cond ((zerop charpos)
265 (let ((prev (line-previous (mark-line mark))))
266 (when prev
267 (always-change-line mark prev)
268 (setf (mark-charpos mark) (line-length* prev))
269 mark)))
270 (t
271 (setf (mark-charpos mark) (1- charpos))
272 mark))))
273
274 (defun mark-after (mark)
275 "Changes the Mark to point one character after where it currently points.
276 NIL is returned if there is no previous character."
277 (let ((line (mark-line mark))
278 (charpos (mark-charpos mark)))
279 (cond ((= charpos (line-length* line))
280 (let ((next (line-next line)))
281 (when next
282 (always-change-line mark next)
283 (setf (mark-charpos mark) 0)
284 mark)))
285 (t
286 (setf (mark-charpos mark) (1+ charpos))
287 mark))))
288
289 (defun character-offset (mark n)
290 "Changes the Mark to point N characters after (or -N before if N is negative)
291 where it currently points. If there aren't N characters before (or after)
292 the mark, Nil is returned."
293 (let ((charpos (mark-charpos mark)))
294 (if (< n 0)
295 (let ((n (- n)))
296 (if (< charpos n)
297 (do ((line (line-previous (mark-line mark)) (line-previous line))
298 (n (- n charpos 1)))
299 ((null line) nil)
300 (let ((length (line-length* line)))
301 (cond ((<= n length)
302 (always-change-line mark line)
303 (setf (mark-charpos mark) (- length n))
304 (return mark))
305 (t
306 (setq n (- n (1+ length)))))))
307 (progn (setf (mark-charpos mark) (- charpos n))
308 mark)))
309 (let* ((line (mark-line mark))
310 (length (line-length* line)))
311 (if (> (+ charpos n) length)
312 (do ((line (line-next line) (line-next line))
313 (n (- n (1+ (- length charpos)))))
314 ((null line) nil)
315 (let ((length (line-length* line)))
316 (cond ((<= n length)
317 (always-change-line mark line)
318 (setf (mark-charpos mark) n)
319 (return mark))
320 (t
321 (setq n (- n (1+ length)))))))
322 (progn (setf (mark-charpos mark) (+ charpos n))
323 mark))))))
324
325 (defun line-offset (mark n &optional charpos)
326 "Changes to Mark to point N lines after (-N before if N is negative) where
327 it currently points. If there aren't N lines after (or before) the Mark,
328 Nil is returned."
329 (if (< n 0)
330 (do ((line (mark-line mark) (line-previous line))
331 (n n (1+ n)))
332 ((null line) nil)
333 (when (= n 0)
334 (always-change-line mark line)
335 (setf (mark-charpos mark)
336 (if charpos
337 (min (line-length line) charpos)
338 (min (line-length line) (mark-charpos mark))))
339 (return mark)))
340 (do ((line (mark-line mark) (line-next line))
341 (n n (1- n)))
342 ((null line) nil)
343 (when (= n 0)
344 (change-line mark line)
345 (setf (mark-charpos mark)
346 (if charpos
347 (min (line-length line) charpos)
348 (min (line-length line) (mark-charpos mark))))
349 (return mark)))))
350
351 ;;; region-bounds -- Public
352 ;;;
353 (defun region-bounds (region)
354 "Return as multiple-value the start and end of Region."
355 (values (region-start region) (region-end region)))
356
357 (defun set-region-bounds (region start end)
358 "Set the start and end of Region to the marks Start and End."
359 (let ((sl (mark-line start))
360 (el (mark-line end)))
361 (when (or (neq (line-%buffer sl) (line-%buffer el))
362 (> (line-number sl) (line-number el))
363 (and (eq sl el) (> (mark-charpos start) (mark-charpos end))))
364 (error "Marks ~S and ~S cannot be made into a region." start end))
365 (setf (region-start region) start (region-end region) end))
366 region)
367
368
369 ;;;; Debugging stuff.
370
371 (defun slf (string)
372 "For a good time, figure out what this function does, and why it was written."
373 (delete #\linefeed (the simple-string string)))
374
375 (defun %print-whole-line (structure stream)
376 (cond ((eq structure open-line)
377 (write-string open-chars stream :end left-open-pos)
378 (write-string open-chars stream :start right-open-pos
379 :end line-cache-length))
380 (t
381 (write-string (line-chars structure) stream))))
382
383 (defun %print-before-mark (mark stream)
384 (if (mark-line mark)
385 (let* ((line (mark-line mark))
386 (chars (line-chars line))
387 (charpos (mark-charpos mark))
388 (length (line-length line)))
389 (declare (simple-string chars))
390 (cond ((or (> charpos length) (< charpos 0))
391 (write-string "{bad mark}" stream))
392 ((eq line open-line)
393 (cond ((< charpos left-open-pos)
394 (write-string open-chars stream :end charpos))
395 (t
396 (write-string open-chars stream :end left-open-pos)
397 (let ((p (+ charpos (- right-open-pos left-open-pos))))
398 (write-string open-chars stream :start right-open-pos
399 :end p)))))
400 (t
401 (write-string chars stream :end charpos))))
402 (write-string "{deleted mark}" stream)))
403
404
405 (defun %print-after-mark (mark stream)
406 (if (mark-line mark)
407 (let* ((line (mark-line mark))
408 (chars (line-chars line))
409 (charpos (mark-charpos mark))
410 (length (line-length line)))
411 (declare (simple-string chars))
412 (cond ((or (> charpos length) (< charpos 0))
413 (write-string "{bad mark}" stream))
414 ((eq line open-line)
415 (cond ((< charpos left-open-pos)
416 (write-string open-chars stream :start charpos
417 :end left-open-pos)
418 (write-string open-chars stream :start right-open-pos
419 :end line-cache-length))
420 (t
421 (let ((p (+ charpos (- right-open-pos left-open-pos))))
422 (write-string open-chars stream :start p
423 :end line-cache-length)))))
424 (t
425 (write-string chars stream :start charpos :end length))))
426 (write-string "{deleted mark}" stream)))
427
428 (defun %print-hline (structure stream d)
429 (declare (ignore d))
430 (write-string "#<Hemlock Line \"" stream)
431 (%print-whole-line structure stream)
432 (write-string "\">" stream))
433
434 (defun %print-hmark (structure stream d)
435 (declare (ignore d))
436 (write-string "#<Hemlock Mark \"" stream)
437 (%print-before-mark structure stream)
438 (write-string "/\\" stream)
439 (%print-after-mark structure stream)
440 (write-string "\">" stream))
441
442 (defvar *print-region* 10
443 "The number of lines to print out of a region, or NIL if none.")
444
445 (defun %print-hregion (region stream d)
446 (declare (ignore d))
447 (write-string "#<Hemlock Region \"" stream)
448 (let* ((start (region-start region))
449 (end (region-end region))
450 (first-line (mark-line start))
451 (last-line (mark-line end)))
452 (cond
453 ((not (and (linep first-line) (linep last-line)
454 (eq (line-%buffer first-line) (line-%buffer last-line))
455 (mark<= start end)))
456 (write-string "{bad region}" stream))
457 (*print-region*
458 (cond ((eq first-line last-line)
459 (let ((cs (mark-charpos start))
460 (ce (mark-charpos end))
461 (len (line-length first-line)))
462 (cond
463 ((or (< cs 0) (> ce len))
464 (write-string "{bad region}" stream))
465 ((eq first-line open-line)
466 (let ((gap (- right-open-pos left-open-pos)))
467 (cond
468 ((<= ce left-open-pos)
469 (write-string open-chars stream :start cs :end ce))
470 ((>= cs left-open-pos)
471 (write-string open-chars stream :start (+ cs gap)
472 :end (+ ce gap)))
473 (t
474 (write-string open-chars stream :start cs
475 :end left-open-pos)
476 (write-string open-chars stream :start right-open-pos
477 :end (+ gap ce))))))
478 (t
479 (write-string (line-chars first-line) stream :start cs
480 :end ce)))))
481 (t
482 (%print-after-mark start stream)
483 (write-char #\/ stream)
484 (do ((line (line-next first-line) (line-next line))
485 (last-line (mark-line end))
486 (cnt *print-region* (1- cnt)))
487 ((or (eq line last-line)
488 (when (zerop cnt) (write-string "..." stream) t))
489 (%print-before-mark end stream))
490 (%print-whole-line line stream)
491 (write-char #\/ stream)))))
492 (t
493 (write-string "{mumble}" stream))))
494 (write-string "\">" stream))
495
496 (defun %print-hbuffer (structure stream d)
497 (declare (ignore d))
498 (write-string "#<Hemlock Buffer \"" stream)
499 (write-string (buffer-name structure) stream)
500 (write-string "\">" stream))

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