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Add higher-order-function-based API for working with untyped AST (#16462
) * Add module-based API for working with untyped AST * Fantomas * tryPickUntil → tryPickDownTo * Don't need that * Thread path while walking * Update comment * Simplify * Expose `Ast.fold` and `Ast.tryPick`. * Expose `SyntaxNode.(|Attributes|)`. * Ensure a few more syntax node cases get hit. * Update FCS release notes * Update surface area * Add back `foldWhile`; add `exists`, `tryNode` * Put `Ast.foldWhile` back in. * Add `Ast.exists`. * Add `Ast.tryNode`. * `SyntaxTraversal.Traverse` → `Ast.tryPick`… * Replace uses of `SyntaxTraversal.Traverse` in `FSharpParseFileResults` with the appropriate function from the `Ast` module: `exists`, `tryPick`, `tryNode`. * Update surface area * Need that * Just to be safe * Add `Ast.tryPickLast` * Handle multiple args mid-pipeline * Before, no signature help was offered in a case like this: ```fsharp [1..10] |> List.fold (fun acc _ -> acc) ‸ |> List.filter (fun x -> x > 3) ``` The service will now offer help for the `state` parameter when the cursor ‸ is in that location. * `*` instead of error * `FSharpParseFileResults.TryRangeOfFunctionOrMethodBeingApplied` was previously returning the range of the (zero-width) `SynExpr.ArbitraryAfterError`. It now returns the range of the `*` (`op_Multiply`) instead. * Update surface area * Fmt * Missed in merge * Add VS release notes entry * # → ### * Add ryPick tests * Add a few more tests * \n * Bump release notes * Fmt * `Ast` → `ParsedInput` * Use `ParsedInput` as the main AST type. * Move the `position` parameter rightward. * Update surface area * Less `function` * Update untyped AST docs * Add basic examples for `ParsedInput` module functions. * Merge the existing `SyntaxVisitorBase` docs into the new file. * Clean up doc comments --------- Co-authored-by: Vlad Zarytovskii <[email protected]>
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