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# Adding Textobject Queries
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Textobjects that are language specific ([like functions, classes, etc][textobjects])
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require an accompanying tree-sitter grammar and a `textobjects.scm` query file
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to work properly. Tree-sitter allows us to query the source code syntax tree
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and capture specific parts of it. The queries are written in a lisp dialect.
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More information on how to write queries can be found in the [official tree-sitter
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documentation][tree-sitter-queries].
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Query files should be placed in `runtime/queries/{language}/textobjects.scm`
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when contributing. Note that to test the query files locally you should put
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them under your local runtime directory (`~/.config/helix/runtime` on Linux
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for example).
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The following [captures][tree-sitter-captures] are recognized:
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| Capture Name |
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| --- |
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| `function.inside` |
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| `function.around` |
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| `class.inside` |
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| `class.around` |
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| `parameter.inside` |
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[Example query files][textobject-examples] can be found in the helix GitHub repository.
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## Queries for Textobject Based Navigation
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[Tree-sitter based navigation][textobjects-nav] is done using captures in the
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following order:
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- `object.movement`
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- `object.around`
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- `object.inside`
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For example if a `function.around` capture has been already defined for a language
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in it's `textobjects.scm` file, function navigation should also work automatically.
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`function.movement` should be defined only if the node captured by `function.around`
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doesn't make sense in a navigation context.
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[textobjects]: ../usage.md#textobjects
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[textobjects-nav]: ../usage.md#tree-sitter-textobject-based-navigation
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[tree-sitter-queries]: https://tree-sitter.github.io/tree-sitter/using-parsers#query-syntax
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[tree-sitter-captures]: https://tree-sitter.github.io/tree-sitter/using-parsers#capturing-nodes
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[textobject-examples]: https://github.com/search?q=repo%3Ahelix-editor%2Fhelix+filename%3Atextobjects.scm&type=Code&ref=advsearch&l=&l=
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