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Refactor and simplify search procedures. Always use batch sized
chunks.
This commit is contained in:
Andrey Kotlarski
parent
090cebc2ab
commit
8e65e13dd9
191
vlfi.el
191
vlfi.el
@ -260,124 +260,69 @@ OP-TYPE specifies the file operation being performed over FILENAME."
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;;;###autoload
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(fset 'abort-if-file-too-large 'vlfi-if-file-too-large)
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(defun vlfi-re-search-forward (regexp count)
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"Search forward for REGEXP prefix COUNT number of times."
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(interactive (list (read-regexp "Search whole file"
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(if regexp-history
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(car regexp-history))
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'regexp-history)
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(or current-prefix-arg 1)))
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(let ((match-chunk-start vlfi-start-pos)
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(match-chunk-end vlfi-end-pos)
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(match-start-pos (point))
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(match-end-pos (point))
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(to-find count)
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(search-reporter (make-progress-reporter
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(concat "Searching for " regexp)
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vlfi-start-pos vlfi-file-size))
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(initial-chunk t))
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;;; search
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(defun vlfi-re-search (regexp count backward)
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"Search for REGEXP COUNT number of times forward or BACKWARD."
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(let* ((match-start-pos (+ vlfi-start-pos (point)))
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(match-end-pos match-start-pos)
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(to-find count)
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(search-reporter (make-progress-reporter
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(concat "Searching for " regexp)
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(if backward
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(- vlfi-file-size vlfi-end-pos)
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vlfi-start-pos)
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vlfi-file-size))
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(half-batch (/ vlfi-batch-size 2)))
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(unwind-protect
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(catch 'end-of-file
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(while (not (zerop to-find))
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(cond ((re-search-forward regexp nil t)
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(setq to-find (if (= match-start-pos
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(match-beginning 0))
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to-find
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(1- to-find))
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match-start-pos (match-beginning 0)
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match-end-pos (match-end 0)
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match-chunk-start vlfi-start-pos
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match-chunk-end vlfi-end-pos)
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(if (and (< vlfi-batch-size match-start-pos)
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(> (- vlfi-end-pos vlfi-start-pos)
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vlfi-batch-size))
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(setq match-chunk-start
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(+ match-chunk-start vlfi-batch-size)
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match-start-pos (- match-start-pos
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vlfi-batch-size)
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match-end-pos (- match-end-pos
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vlfi-batch-size))))
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((= vlfi-end-pos vlfi-file-size)
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(throw 'end-of-file nil))
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(t (if initial-chunk
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(progn (setq initial-chunk nil)
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(vlfi-next-batch -1))
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(vlfi-move-to-chunk (+ vlfi-start-pos
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vlfi-batch-size)
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(+ vlfi-end-pos
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vlfi-batch-size)))
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(goto-char (if (< vlfi-start-pos match-chunk-end)
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match-start-pos
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(point-min)))
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(goto-char match-start-pos)
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(progress-reporter-update search-reporter
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vlfi-end-pos))))
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(if backward
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(while (not (zerop to-find))
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(cond ((re-search-backward regexp nil t)
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(setq match-start-pos (+ vlfi-start-pos
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(match-beginning 0)))
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(let ((new-match-end (+ vlfi-start-pos
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(match-end 0))))
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(if (< new-match-end match-end-pos)
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(setq to-find (1- to-find)
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match-end-pos new-match-end))))
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((zerop vlfi-start-pos)
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(throw 'end-of-file nil))
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(t (vlfi-move-to-batch (- vlfi-start-pos
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half-batch))
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(goto-char (if (< match-start-pos
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vlfi-end-pos)
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(- match-start-pos
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vlfi-start-pos)
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(point-max)))
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(progress-reporter-update search-reporter
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vlfi-start-pos))))
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(while (not (zerop to-find))
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(cond ((re-search-forward regexp nil t)
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(setq match-end-pos (+ vlfi-start-pos
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(match-end 0)))
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(let ((new-match-start (+ vlfi-start-pos
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(match-beginning 0))))
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(if (< match-start-pos new-match-start)
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(setq to-find (1- to-find)
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match-start-pos new-match-start))))
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((= vlfi-end-pos vlfi-file-size)
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(throw 'end-of-file nil))
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(t (vlfi-move-to-batch (- vlfi-end-pos half-batch))
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(goto-char (if (< vlfi-start-pos match-end-pos)
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(- match-end-pos vlfi-start-pos)
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(point-min)))
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(progress-reporter-update search-reporter
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vlfi-end-pos)))))
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(progress-reporter-done search-reporter))
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(vlfi-end-search match-chunk-start match-chunk-end
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match-end-pos count to-find))))
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(vlfi-end-search (if backward match-start-pos match-end-pos)
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count to-find))))
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(defun vlfi-re-search-backward (regexp count)
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"Search backward for REGEXP prefix COUNT number of times."
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(interactive (list (read-regexp "Search whole file"
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(if regexp-history
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(car regexp-history))
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'regexp-history)
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(or current-prefix-arg 1)))
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(let ((match-chunk-start vlfi-start-pos)
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(match-chunk-end vlfi-end-pos)
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(match-start-pos (point))
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(match-end-pos (point))
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(to-find count)
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(search-reporter (make-progress-reporter
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(concat "Searching for " regexp)
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(- vlfi-file-size vlfi-end-pos)
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vlfi-file-size))
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(initial-chunk t))
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(unwind-protect
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(catch 'start-of-file
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(while (not (zerop to-find))
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(cond ((re-search-backward regexp nil t)
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(setq to-find (if (= match-end-pos
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(match-end 0))
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to-find
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(1- to-find))
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match-start-pos (match-beginning 0)
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match-end-pos (match-end 0)
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match-chunk-start vlfi-start-pos
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match-chunk-end vlfi-end-pos)
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(if (and (< match-end-pos vlfi-batch-size)
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(> (- vlfi-end-pos vlfi-start-pos)
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vlfi-batch-size))
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(setq match-chunk-end
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(- match-chunk-end
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vlfi-batch-size))))
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((zerop vlfi-start-pos)
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(throw 'start-of-file nil))
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(t (if initial-chunk
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(progn (setq initial-chunk nil)
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(vlfi-prev-batch -1))
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(vlfi-move-to-chunk (- vlfi-start-pos
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vlfi-batch-size)
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(- vlfi-end-pos
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vlfi-batch-size)))
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(goto-char (if (< match-chunk-start vlfi-end-pos)
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match-end-pos
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(point-max)))
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(setq last-chunk-match nil)
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(progress-reporter-update search-reporter
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(- vlfi-file-size
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vlfi-start-pos)))))
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(progress-reporter-done search-reporter))
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(vlfi-end-search match-chunk-start match-chunk-end
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match-start-pos count to-find))))
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(defun vlfi-end-search (match-chunk-start match-chunk-end
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match-pos count to-find)
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"Move to chunk determined by MATCH-CHUNK-START and MATCH-CHUNK-END.
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Go to MATCH-POS and according to COUNT and left TO-FIND show if search
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has been successful. Return nil if nothing found."
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(vlfi-move-to-chunk match-chunk-start match-chunk-end)
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(goto-char match-pos)
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(defun vlfi-end-search (match-pos count to-find)
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"Move to chunk surrounding MATCH-POS.
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According to COUNT and left TO-FIND show if search has been
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successful. Return nil if nothing found."
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(vlfi-move-to-batch (- match-pos (/ vlfi-batch-size 2)))
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(goto-char (- match-pos vlfi-start-pos))
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(cond ((zerop to-find) t)
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((< to-find count)
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(message "Moved to the %d match which is last found"
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@ -386,6 +331,24 @@ has been successful. Return nil if nothing found."
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(t (message "Not found")
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nil)))
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(defun vlfi-re-search-forward (regexp count)
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"Search forward for REGEXP prefix COUNT number of times."
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(interactive (list (read-regexp "Search whole file"
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(if regexp-history
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(car regexp-history))
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'regexp-history)
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(or current-prefix-arg 1)))
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(vlfi-re-search regexp count nil))
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(defun vlfi-re-search-backward (regexp count)
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"Search backward for REGEXP prefix COUNT number of times."
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(interactive (list (read-regexp "Search whole file"
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(if regexp-history
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(car regexp-history))
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'regexp-history)
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(or current-prefix-arg 1)))
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(vlfi-re-search regexp count t))
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(provide 'vlfi)
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;;; vlfi.el ends here
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