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authorvanaigr <vanaigranov@gmail.com>2024-05-16 09:57:58 -0500
committerGitHub <noreply@github.com>2024-05-16 16:57:58 +0200
commit4b029163345333a2c6975cd0dace6613b036ae47 (patch)
treeef4b6f914f6415d019e0a6fb64f1e8fd355aa5bc /runtime/lua/vim/shared.lua
parent31dc6279693886a628119cd6c779e580faab32fd (diff)
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perf(treesitter): use child_containing_descendant() in has-ancestor? (#28512)
Problem: `has-ancestor?` is O(n²) for the depth of the tree since it iterates over each of the node's ancestors (bottom-up), and each ancestor takes O(n) time. This happens because tree-sitter's nodes don't store their parent nodes, and the tree is searched (top-down) each time a new parent is requested. Solution: Make use of new `ts_node_child_containing_descendant()` in tree-sitter v0.22.6 (which is now the minimum required version) to rewrite the `has-ancestor?` predicate in C to become O(n). For a sample file, decreases the time taken by `has-ancestor?` from 360ms to 6ms.
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