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Fix: (--value-at) On cache miss, return nil when function does

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Previously, on a cache miss, if FN returned nil, the sentinel would be
returned instead of nil.

Closes #78.  Thanks to Josh Moller-Mara (@mm--) for reporting.
This commit is contained in:
Adam Porter 2019-12-21 16:28:51 -06:00
parent b9dfd7d93b
commit 091a732a88
2 changed files with 44 additions and 32 deletions
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63
org-ql.el
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@ -447,37 +447,38 @@ Values compared with `equal'."
;; I'd like to use `-if-let*', but it doesn't leave non-nil variables
;; bound in the else clause, so destructured variables that are non-nil,
;; like found caches, are not available in the else clause.
(if-let* ((buffer-cache (gethash (current-buffer) org-ql-node-value-cache))
(modified-tick (car buffer-cache))
(position-cache (cdr buffer-cache))
(buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(value-cache (gethash position position-cache))
(cached-value (alist-get fn value-cache nil nil #'equal)))
;; Found in cache: return it.
(pcase cached-value
('org-ql-nil nil)
(_ cached-value))
;; Not found in cache: get value and cache it.
(let ((new-value (or (funcall fn) 'org-ql-nil)))
;; Check caches again, because it may have been set now, e.g. by
;; recursively going up an outline tree.
;; TODO: Is there a clever way we could avoid doing this, or is it inherently necessary?
(setf buffer-cache (gethash (current-buffer) org-ql-node-value-cache)
modified-tick (car buffer-cache)
position-cache (cdr buffer-cache)
value-cache (when position-cache
(gethash position position-cache))
buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(unless (and buffer-cache buffer-unmodified-p)
;; Buffer-local node cache empty or invalid: make new one.
(setf position-cache (make-hash-table)
value-cache (gethash position position-cache))
(puthash (current-buffer)
(cons (buffer-modified-tick) position-cache)
org-ql-node-value-cache))
(map-put value-cache fn new-value)
(puthash position value-cache position-cache)
new-value)))
(pcase (if-let* ((buffer-cache (gethash (current-buffer) org-ql-node-value-cache))
(modified-tick (car buffer-cache))
(position-cache (cdr buffer-cache))
(buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(value-cache (gethash position position-cache))
(cached-value (alist-get fn value-cache nil nil #'equal)))
;; Found in cache: return it.
cached-value
;; Not found in cache: call FN, cache and return its value.
(let ((new-value (or (funcall fn) 'org-ql-nil)))
;; Check caches again, because it may have been set now, e.g. by
;; recursively going up an outline tree.
;; TODO: Is there a clever way we could avoid doing this, or is it inherently necessary?
(setf buffer-cache (gethash (current-buffer) org-ql-node-value-cache)
modified-tick (car buffer-cache)
position-cache (cdr buffer-cache)
value-cache (when position-cache
(gethash position position-cache))
buffer-unmodified-p (eq (buffer-modified-tick) modified-tick))
(unless (and buffer-cache buffer-unmodified-p)
;; Buffer-local node cache empty or invalid: make new one.
(setf position-cache (make-hash-table)
value-cache (gethash position position-cache))
(puthash (current-buffer)
(cons (buffer-modified-tick) position-cache)
org-ql-node-value-cache))
(map-put value-cache fn new-value)
(puthash position value-cache position-cache)
new-value))
;; Return nil or the non-nil value.
('org-ql-nil nil)
(else else)))
(defun org-ql--add-markers (element)
"Return ELEMENT with Org marker text properties added.