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Code Issues Releases Wiki Activity

Improve correctness of search forward.

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This commit is contained in:
Andrey Kotlarski 2013-03-31 02:36:54 +02:00
parent 91fecb78c9
commit 2a7625afe6
1 changed files with 100 additions and 14 deletions
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114
vlfi.el
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@ -164,6 +164,19 @@ When prefix argument is negative
(set-buffer-modified-p nil)
(vlfi-update-buffer-name))
(defun vlfi-move-to-chunk (start end)
"Move to chunk determined by START END."
(when (< vlfi-file-size end) ; re-check file size
(setq vlfi-file-size (nth 7 (file-attributes buffer-file-name))))
(setq vlfi-start-pos start
vlfi-end-pos (min end vlfi-file-size))
(let ((inhibit-read-only t))
(erase-buffer)
(insert-file-contents buffer-file-name nil
vlfi-start-pos vlfi-end-pos))
(set-buffer-modified-p nil)
(vlfi-update-buffer-name))
(defun vlfi-insert-file (file &optional from-end)
"Insert first chunk of FILE contents in current buffer.
With FROM-END prefix, start from the back."
@ -172,12 +185,7 @@ With FROM-END prefix, start from the back."
vlfi-end-pos vlfi-file-size)
(setq vlfi-start-pos 0
vlfi-end-pos (min vlfi-batch-size vlfi-file-size)))
(let ((inhibit-read-only t))
(erase-buffer)
(insert-file-contents buffer-file-name nil
vlfi-start-pos vlfi-end-pos))
(set-buffer-modified-p nil)
(vlfi-update-buffer-name))
(vlfi-move-to-chunk vlfi-start-pos vlfi-end-pos))
;;;###autoload
(defun vlfi (file &optional from-end)
@ -248,37 +256,63 @@ OP-TYPE specifies the file operation being performed over FILENAME."
vlfi-start-pos)
vlfi-file-size))
(initial-chunk t)
(prev 0))
(prev 0)
match-chunk-start-pos match-chunk-end-pos)
(unwind-protect
(catch 'end-of-file
(if backward
(while (not (zerop to-find))
(cond ((re-search-backward regexp nil t)
(setq to-find (1- to-find)))
(setq to-find (1- to-find)
match-chunk-start-pos vlfi-start-pos
match-chunk-end-pos
(if (< (match-end 0) prev)
vlfi-end-pos
(- vlfi-end-pos vlfi-batch-size))))
((zerop vlfi-start-pos)
(throw 'end-of-file nil))
(throw 'end-of-file t))
(t (if initial-chunk
(setq initial-chunk nil)
(let ((inhibit-read-only t))
(delete-region prev (point-max))))
(delete-region prev (point-max)))
(setq vlfi-end-pos (- vlfi-end-pos
vlfi-batch-size)))
(setq prev (point-min))
(vlfi-prev-batch -1)
(goto-char (point-max))
(progress-reporter-update
search-reporter (- vlfi-file-size
vlfi-end-pos)))))
(while (not (zerop to-find))
(cond ((re-search-forward regexp nil t)
(setq to-find (1- to-find)))
(setq to-find (1- to-find)
match-chunk-end-pos vlfi-end-pos
match-chunk-start-pos
(if (< prev (match-beginning 0))
vlfi-start-pos
(+ vlfi-start-pos vlfi-batch-size))))
((= vlfi-end-pos vlfi-file-size)
(throw 'end-of-file nil))
(throw 'end-of-file t))
(t (if initial-chunk
(setq initial-chunk nil)
(let ((inhibit-read-only t))
(delete-region (point-min) prev)))
(delete-region (point-min) prev))
(setq vlfi-start-pos (+ vlfi-start-pos
vlfi-batch-size)))
(setq prev (point-max))
(vlfi-next-batch -1)
(goto-char (point-min))
(progress-reporter-update search-reporter
vlfi-end-pos))))))
(and (not initial-chunk)
(< to-find count)
(if backward ; remove additional chunk
(if (< (match-end 0) prev)
(let ((inhibit-read-only t))
(delete-region prev (point-max))))
(if (< prev (match-beginning 0))
(let ((inhibit-read-only t))
(delete-region (point-min) prev)))))
(progress-reporter-done search-reporter)
(or (zerop to-find)
(if (< to-find count)
@ -297,7 +331,59 @@ OP-TYPE specifies the file operation being performed over FILENAME."
(defun vlfi-re-search-forward (regexp count)
"Search forward for REGEXP COUNT number of times."
(interactive "sSearch whole file: \np")
(vlfi-re-search regexp nil count))
(let ((match-chunk-start-pos vlfi-start-pos)
(match-chunk-end-pos vlfi-end-pos)
(match-start-pos (point))
(match-end-pos (point))
(to-find count)
(search-reporter (make-progress-reporter
(concat "Searching for " regexp)
vlfi-start-pos vlfi-file-size))
(initial-chunk t))
(unwind-protect
(catch 'end-of-file
(while (not (zerop to-find))
(cond ((re-search-forward regexp nil t)
(setq to-find (if (= match-start-pos
(match-beginning 0))
to-find
(1- to-find))
match-start-pos (match-beginning 0)
match-end-pos (match-end 0)
match-chunk-start-pos vlfi-start-pos
match-chunk-end-pos vlfi-end-pos)
(if (< vlfi-batch-size match-start-pos)
(setq match-chunk-start-pos
(+ match-chunk-start-pos vlfi-batch-size)
match-start-pos (- match-start-pos
vlfi-batch-size)
match-end-pos (- match-end-pos
vlfi-batch-size))))
((= vlfi-end-pos vlfi-file-size)
(throw 'end-of-file nil))
(t (if initial-chunk
(progn (setq initial-chunk nil)
(vlfi-next-batch -1))
(vlfi-move-to-chunk (+ vlfi-start-pos
vlfi-batch-size)
(+ vlfi-end-pos
vlfi-batch-size)))
(goto-char match-start-pos)
(progress-reporter-update search-reporter
vlfi-end-pos))))
(progress-reporter-done search-reporter))
(if (zerop to-find)
(when (< vlfi-start-pos match-chunk-start-pos)
(let ((inhibit-read-only t))
(delete-region (point-min) (1+ vlfi-batch-size)))
(setq vlfi-start-pos match-chunk-start-pos))
(vlfi-move-to-chunk match-chunk-start-pos
match-chunk-end-pos)
(goto-char match-end-pos)
(if (< to-find count)
(message "Moved to the %d match which is last found"
(- count to-find))
(message "Not found"))))))
(defun vlfi-re-search-backward (regexp count)
"Search backward for REGEXP COUNT number of times."