How to limit matches to "exact" results

[keith]

I have this sg command: sg -p 'override func setUp() { super.setUp() }' -l swift. I would expect this to only match:

override func setUp() {
    super.setUp()
}

and not:

override func setUp() {
    super.setUp()
    print("more statements")
}

But it does actually match both. Is there special syntax to restrict the match somehow? Otherwise is this type of issue up to sg or the Swift specific tree-sitter parser?

[HerringtonDarkholme]

It looks like that the behavior is tree-sitter-swift specific.

Other languages, say JavaScript does not have the issue at all.

Unfortunately, we don't have swift on the playground yet. And it is not easy to debug tree-sitter with CLI only.

I'm planning to add the playground support recently. And then I can vet the issue here.

[HerringtonDarkholme]

I have added Swift AST Playground

The issue here is the statements AST.

two statemtements	one statement

ast-grep will first try matching function_body. And then see body's direct children {, statements, and } matches.
Finally, two statements matches because the two-statement source contains all statement from query.

Let me think about how the matching algorithm should work here....

[php-coder]

Any updates on this? :)

[HerringtonDarkholme]

I don't think this is an easy fix. You can use YAML not rule to filter unwanted matching instead, at the moment.