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authorMichael Davis2022-11-17 01:03:02 +0000
committerGitHub2022-11-17 01:03:02 +0000
commit94346356e7657011adf0012651ec031b98d87411 (patch)
tree694dd8d0cb604facf011b890ba482e7f802ed78b /VERSION
parentc6b83368b3b626cb63120b5ac684cc8b1b693172 (diff)
Use TreeCursor to pretty-print :tree-sitter-subtree (#4606)
The current `:tree-sitter-subtree` has a bug for field-names when the field name belongs to an unnamed child node. Take this ruby example: def self.method_name true end The subtree given by tree-sitter-cli is: (singleton_method [2, 0] - [4, 3] object: (self [2, 4] - [2, 8]) name: (identifier [2, 9] - [2, 20]) body: (body_statement [3, 2] - [3, 6] (true [3, 2] - [3, 6]))) But the `:tree-sitter-subtree` output was (singleton_method object: (self) body: (identifier) (body_statement (true))) The `singleton_method` rule defines the `name` and `body` fields in an unnamed helper rule `_method_rest` and the old implementation of `pretty_print_tree_impl` would pass the `field_name` down from the named `singleton_method` node. To fix it we switch to the [TreeCursor] API which is recommended by the tree-sitter docs for traversing the tree. `TreeCursor::field_name` accurately determines the field name for the current cursor position even when the node is unnamed. [TreeCursor]: https://docs.rs/tree-sitter/0.20.9/tree_sitter/struct.TreeCursor.html
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