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I realized that using an arbitrary function as the predicate in queries is very helpful for some queries I'm writing for python and javascript, and presumably most other languages[1]. Granted, we can already filter out unwanted nodes by using a function instead of a face for the capture name, and (1) determine whether the captured node is valid and (2) fontify that node if it's valid. However, such approach is a bit more cumbersome and more importantly gets in the way of another potential use of the fontification queries: context extraction. For example, I could use the query for the 'variable' feature to get all the variables in a certain region. In this use-case, we want the filtering happen before returning the captured nodes. Besides, the change is relatively small and straightforward: most code are already there, I just need to add some boilerplate. [1] For a code like aa.bb(cc), we want bb to be in function face, because obviously its a function. But for aa.bb, we want bb to be in property face, because it's a property. In the AST, bb is always a property, the difference between the two cases is the enclosing node: in the first case, aa.bb is in a "call_expression" node, indicating that bb is used as a function (a method). So we want a predicate function that checks whether bb is used as a function or a property, and determine whether it should be in function or property face. * doc/lispref/parsing.texi (Pattern Matching): Update manual. * src/treesit.c (Ftreesit_pattern_expand): Handle :pred. (treesit_predicate_capture_name_to_node): A new function extracted from treesit_predicate_capture_name_to_text. (treesit_predicate_capture_name_to_text): Use the newly extracted function. (treesit_predicate_pred): New predicate function. (treesit_eval_predicates): Add new predicate. Also fix a bug: we want to AND the results of each predicate. * test/src/treesit-tests.el (treesit--ert-pred-last-sibling): New helper function. (treesit-query-api): Test #pred predicate. |
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