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Add recursion limit to treesit--children-covering-range-recurse

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* lisp/treesit.el (treesit--children-covering-range-recurse): Add
limit.
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Yuan Fu 2022-12-07 16:36:07 -08:00
parent b429e52428
commit 670daa8b62
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1 changed files with 11 additions and 4 deletions
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15
lisp/treesit.el
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@ -833,21 +833,28 @@ The range is between START and END."
(nreverse result)) (nreverse result))
(list node))) (list node)))
(defun treesit--children-covering-range-recurse (node start end threshold) (defun treesit--children-covering-range-recurse
(node start end threshold &optional limit)
"Return a list of children of NODE covering a range. "Return a list of children of NODE covering a range.
Recursively go down the parse tree and collect children, until Recursively go down the parse tree and collect children, until
all nodes in the returned list are smaller than THRESHOLD. The all nodes in the returned list are smaller than THRESHOLD. The
range is between START and END." range is between START and END.
LIMIT is the recursion limit, which defaults to 100."
(let* ((child (treesit-node-first-child-for-pos node start)) (let* ((child (treesit-node-first-child-for-pos node start))
(limit (or limit 100))
result) result)
(while (and child (<= (treesit-node-start child) end)) ;; If LIMIT is exceeded, we are probably seeing the erroneously
;; tall tree, in that case, just give up.
(while (and (> limit 0) child (<= (treesit-node-start child) end))
;; If child still too large, recurse down. Otherwise collect ;; If child still too large, recurse down. Otherwise collect
;; child. ;; child.
(if (> (- (treesit-node-end child) (if (> (- (treesit-node-end child)
(treesit-node-start child)) (treesit-node-start child))
threshold) threshold)
(dolist (r (treesit--children-covering-range-recurse (dolist (r (treesit--children-covering-range-recurse
child start end threshold)) child start end threshold (1- limit)))
(push r result)) (push r result))
(push child result)) (push child result))
(setq child (treesit-node-next-sibling child))) (setq child (treesit-node-next-sibling child)))