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https://github.com/m00natic/vlfi.git
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Manually decode and use several bytes buffer when loading chunk.
This commit is contained in:
Andrey Kotlarski
parent
df8c9ea5dd
commit
dd43af51ff
191
vlf-base.el
191
vlf-base.el
@ -27,15 +27,9 @@
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;;; Code:
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(defconst vlf-min-chunk-size 16
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(defconst vlf-sample-size 24
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"Minimal number of bytes that can be properly decoded.")
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(defconst vlf-partial-decode-shown
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(cond ((< emacs-major-version 24) t)
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((< 24 emacs-major-version) nil)
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(t ;; TODO: use (< emacs-minor-version 4) after 24.4 release
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(string-lessp emacs-version "24.3.5")))
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"Indicates whether partial decode codes are displayed.")
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(defun vlf-get-file-size (file)
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"Get size in bytes of FILE."
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(or (nth 7 (file-attributes file)) 0))
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@ -70,7 +64,7 @@ If non-nil, UPDATE-VISITED-TIME."
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(setq buffer-undo-list undo-list))))
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(defun vlf-move-to-chunk (start end &optional minimal)
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"Move to chunk determined by START END.
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"Move to chunk enclosed by START END bytes.
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When given MINIMAL flag, skip non important operations.
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If same as current chunk is requested, do nothing.
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Return number of bytes moved back for proper decoding and number of
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@ -84,7 +78,7 @@ bytes added to the end."
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shifts)))
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(defun vlf-move-to-chunk-1 (start end)
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"Move to chunk determined by START END keeping as much edits if any.
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"Move to chunk enclosed by START END keeping as much edits if any.
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Return number of bytes moved back for proper decoding and number of
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bytes added to the end."
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(let* ((modified (buffer-modified-p))
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@ -113,8 +107,9 @@ bytes added to the end."
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(let ((pos (+ (position-bytes (point)) vlf-start-pos))
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(inhibit-read-only t))
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(cond ((< end edit-end)
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(let* ((del-pos (1+ (byte-to-position
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(- end vlf-start-pos))))
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(let* ((del-pos (1+ (or (byte-to-position
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(- end vlf-start-pos))
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0)))
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(del-len (length (encode-coding-region
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del-pos (point-max)
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buffer-file-coding-system
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@ -126,13 +121,11 @@ bytes added to the end."
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(vlf-with-undo-disabled
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(delete-region del-pos (point-max)))))
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((< edit-end end)
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(if (and (not vlf-partial-decode-shown)
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(< (- end vlf-end-pos) 4))
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(setq end vlf-end-pos)
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(vlf-with-undo-disabled
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(setq shift-end (cdr (vlf-insert-file-contents
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vlf-end-pos end nil t
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(point-max))))))))
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(vlf-with-undo-disabled
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(setq shift-end (cdr (vlf-insert-file-contents
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vlf-end-pos end
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(/= start vlf-end-pos) t
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(point-max)))))))
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(cond ((< vlf-start-pos start)
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(let* ((del-pos (1+ (byte-to-position
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(- start vlf-start-pos))))
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@ -143,20 +136,18 @@ bytes added to the end."
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(setq start (+ vlf-start-pos del-len))
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(vlf-with-undo-disabled
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(delete-region (point-min) del-pos))
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(vlf-shift-undo-list (- 1 del-pos))))
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(vlf-shift-undo-list (- (point-min) del-pos))))
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((< start vlf-start-pos)
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(if (and (not vlf-partial-decode-shown)
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(< (- vlf-start-pos start) 4))
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(setq start vlf-start-pos)
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(let ((edit-end-pos (point-max)))
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(vlf-with-undo-disabled
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(setq shift-start (car (vlf-insert-file-contents
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start vlf-start-pos
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t nil edit-end-pos)))
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(goto-char (point-min))
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(insert (delete-and-extract-region
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edit-end-pos (point-max))))
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(vlf-shift-undo-list (- (point-max) edit-end-pos))))))
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(let ((edit-end-pos (point-max)))
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(vlf-with-undo-disabled
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(setq shift-start (car (vlf-insert-file-contents
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start vlf-start-pos t
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(/= end vlf-start-pos)
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edit-end-pos)))
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(goto-char (point-min))
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(insert (delete-and-extract-region
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edit-end-pos (point-max))))
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(vlf-shift-undo-list (- (point-max) edit-end-pos)))))
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(setq start (- start shift-start))
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(goto-char (or (byte-to-position (- pos start))
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(byte-to-position (- pos vlf-start-pos))
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@ -200,17 +191,19 @@ bytes added to the end."
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(setq adjust-start (and adjust-start (not (zerop start)))
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adjust-end (and adjust-end (< end vlf-file-size))
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position (or position (point-min)))
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(goto-char position)
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(let ((shift-start 0)
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(shift-end 0))
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(shift-end 0)
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(safe-end (if adjust-end
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(min vlf-file-size (+ end 4))
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end)))
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(if adjust-start
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(setq shift-start (vlf-adjust-start start end position
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(setq shift-start (vlf-adjust-start start safe-end position
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adjust-end)
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start (- start shift-start))
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(setq shift-end (vlf-insert-content-safe start end position)
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end (+ end shift-end)))
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(vlf-insert-file-contents-safe start safe-end position))
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(if adjust-end
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(setq shift-end (+ shift-end
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(vlf-adjust-end start end position))))
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(setq shift-end (vlf-adjust-end start end position)))
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(cons shift-start shift-end)))
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(defun vlf-adjust-start (start end position adjust-end)
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@ -218,83 +211,75 @@ bytes added to the end."
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be properly decoded. Use buffer POSITION as start.
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ADJUST-END is non-nil if end would be adjusted later.
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Return number of bytes moved back for proper decoding."
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(let* ((min-end (min end (+ start vlf-min-chunk-size)))
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(chunk-size (- min-end start))
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(strict (and (not adjust-end) (= min-end end)))
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(shift (vlf-insert-content-safe start min-end position t)))
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(setq start (- start shift))
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(while (and (not (zerop start))
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(let* ((safe-start (max 0 (- start 4)))
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(sample-end (min end (+ safe-start vlf-sample-size)))
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(chunk-size (- sample-end safe-start))
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(strict (or (= sample-end vlf-file-size)
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(and (not adjust-end) (= sample-end end))))
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(shift 0))
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(while (and (progn (vlf-insert-file-contents-safe
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safe-start sample-end position)
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(not (zerop safe-start)))
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(< shift 3)
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(let ((diff (- chunk-size
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(length
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(encode-coding-region
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position (point-max)
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buffer-file-coding-system t)))))
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(cond (strict (not (zerop diff)))
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(vlf-partial-decode-shown
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(or (< diff -3) (< 0 diff)))
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(t (or (< diff 0) (< 3 diff))))))
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(if strict
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(not (zerop diff))
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(or (< diff 0) (< 3 diff)))))
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(setq shift (1+ shift)
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start (1- start)
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safe-start (1- safe-start)
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chunk-size (1+ chunk-size))
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(delete-region position (point-max))
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(insert-file-contents buffer-file-name nil start min-end))
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(unless (= min-end end)
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(delete-region position (point-max))
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(insert-file-contents buffer-file-name nil start end))
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shift))
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(delete-region position (point-max)))
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(let ((cut-pos position)
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(cut-len 0))
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(while (< safe-start start)
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(setq cut-len (length (encode-coding-region
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cut-pos (1+ cut-pos)
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buffer-file-coding-system t))
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cut-pos (1+ cut-pos)
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safe-start (+ safe-start cut-len)))
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(if (< start safe-start)
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(setq safe-start (- safe-start cut-len)
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cut-pos (1- cut-pos)))
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(if (= sample-end end)
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(delete-region position cut-pos)
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(delete-region position (point-max))
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(vlf-insert-file-contents-safe safe-start end position)))
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(- start safe-start)))
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(defun vlf-adjust-end (start end position)
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"Adjust chunk end at absolute START to END till content can be\
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properly decoded starting at POSITION.
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Return number of bytes added for proper decoding."
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(let ((shift 0))
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(if vlf-partial-decode-shown
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(let ((new-pos (max position
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(- (point-max) vlf-min-chunk-size))))
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(if (< position new-pos)
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(setq start (+ start (length (encode-coding-region
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position new-pos
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buffer-file-coding-system
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t)))
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position new-pos))))
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(let ((chunk-size (- end start)))
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(goto-char (point-max))
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(while (and (< shift 3)
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(< end vlf-file-size)
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(or (eq (char-charset (preceding-char)) 'eight-bit)
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(/= chunk-size
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(length (encode-coding-region
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position (point-max)
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buffer-file-coding-system t)))))
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(setq shift (1+ shift)
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end (1+ end)
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chunk-size (1+ chunk-size))
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(delete-region position (point-max))
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(insert-file-contents buffer-file-name nil start end)
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(goto-char (point-max))))
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shift))
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"Adjust chunk end at absolute START to END starting at POSITION.
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Remove characters from the end until length is closest to expected.
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Return number of bytes added over expected."
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(let ((expected-size (- end start))
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(current-size (length (encode-coding-region
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position (point-max)
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buffer-file-coding-system t)))
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(cut-point (point-max))
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(cut-len 0))
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(while (< expected-size current-size)
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(setq cut-len (length (encode-coding-region
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(1- cut-point) cut-point
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buffer-file-coding-system t))
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cut-point (1- cut-point)
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current-size (- current-size cut-len)))
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(if (< current-size expected-size)
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(setq cut-point (1+ cut-point)
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current-size (+ current-size cut-len)))
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(delete-region cut-point (point-max))
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(- current-size expected-size)))
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(defun vlf-insert-content-safe (start end position &optional shift-start)
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"Insert file content from absolute START to END of file at\
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POSITION. Adjust start if SHIFT-START is non nil, end otherwise.
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Clean up if no characters are inserted."
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(goto-char position)
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(let ((shift 0))
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(while (and (< shift 3)
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(zerop (cadr (insert-file-contents buffer-file-name
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nil start end)))
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(if shift-start
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(not (zerop start))
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(< end vlf-file-size)))
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;; TODO: this seems like regression after Emacs 24.3
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(message "Buffer content may be broken")
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(setq shift (1+ shift))
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(if shift-start
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(setq start (1- start))
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(setq end (1+ end)))
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(delete-region position (point-max)))
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shift))
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(defun vlf-insert-file-contents-safe (start end position)
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"Extract decoded file bytes START to END at POSITION."
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(let ((coding buffer-file-coding-system))
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(insert-file-contents-literally buffer-file-name nil start end)
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(let ((coding-system-for-read coding))
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(decode-coding-inserted-region position (point-max)
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buffer-file-name nil start end))
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(setq buffer-file-coding-system last-coding-system-used)))
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(defun vlf-shift-undo-list (n)
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"Shift undo list element regions by N."
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