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271 lines
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271 lines
15 KiB
HTML
8 months ago
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<title>Adding textobject queries</title>
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../title-page.html">Helix</a></li><li class="chapter-item expanded "><a href="../install.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="../usage.html"><strong aria-hidden="true">2.</strong> Usage</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../keymap.html"><strong aria-hidden="true">2.1.</strong> Keymap</a></li><li class="chapter-item expanded "><a href="../commands.html"><strong aria-hidden="true">2.2.</strong> Commands</a></li><li class="chapter-item expanded "><a href="../lang-support.html"><strong aria-hidden="true">2.3.</strong> Language support</a></li></ol></li><li class="chapter-item expanded "><a href="../from-vim.html"><strong aria-hidden="true">3.</strong> Migrating from Vim</a></li><li class="chapter-item expanded "><a href="../configuration.html"><strong aria-hidden="true">4.</strong> Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../themes.html"><strong aria-hidden="true">4.1.</strong> Themes</a></li><li class="chapter-item expanded "><a href="../remapping.html"><strong aria-hidden="true">4.2.</strong> Key remapping</a></li><li class="chapter-item expanded "><a href="../languages.html"><strong aria-hidden="true">4.3.</strong> Languages</a></li></ol></li><li class="chapter-item expanded "><a href="../guides/index.html"><strong aria-hidden="true">5.</strong> Guides</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../guides/adding_languages.html"><strong aria-hidden="true">5.1.</strong> Adding languages</a></li><li class="chapter-item expanded "><a href="../guides/textobject.html" class="active"><strong aria-hidden="true">5.2.</strong> Adding textobject queries</a></li><li class="chapter-item expanded "><a href="../guides/indent.html"><strong aria-hidden="true">5.3.</strong> Adding indent queries</a></li><li class="chapter-item expanded "><a href="../guides/injection.html"><strong aria-hidden="true">5.4.</strong> Adding injection queries</a></li></ol></li></ol>
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<div id="content" class="content">
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<main>
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<h1 id="adding-textobject-queries"><a class="header" href="#adding-textobject-queries">Adding textobject queries</a></h1>
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<p>Helix supports textobjects that are language specific, such as functions, classes, etc.
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These textobjects require an accompanying tree-sitter grammar and a <code>textobjects.scm</code> 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 <a href="https://tree-sitter.github.io/tree-sitter/using-parsers#query-syntax">official tree-sitter
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documentation</a>.</p>
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<p>Query files should be placed in <code>runtime/queries/{language}/textobjects.scm</code>
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when contributing to Helix. Note that to test the query files locally you should put
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them under your local runtime directory (<code>~/.config/helix/runtime</code> on Linux
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for example).</p>
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<p>The following <a href="https://tree-sitter.github.io/tree-sitter/using-parsers#capturing-nodes">captures</a> are recognized:</p>
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<div class="table-wrapper"><table><thead><tr><th>Capture Name</th></tr></thead><tbody>
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<tr><td><code>function.inside</code></td></tr>
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<tr><td><code>function.around</code></td></tr>
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<tr><td><code>class.inside</code></td></tr>
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<tr><td><code>class.around</code></td></tr>
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<tr><td><code>test.inside</code></td></tr>
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<tr><td><code>test.around</code></td></tr>
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<tr><td><code>parameter.inside</code></td></tr>
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<tr><td><code>comment.inside</code></td></tr>
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<tr><td><code>comment.around</code></td></tr>
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</tbody></table>
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</div>
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<p><a href="https://github.com/search?q=repo%3Ahelix-editor%2Fhelix+path%3A%2A%2A/textobjects.scm&type=Code&ref=advsearch&l=&l=">Example query files</a> can be found in the helix GitHub repository.</p>
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<h2 id="queries-for-textobject-based-navigation"><a class="header" href="#queries-for-textobject-based-navigation">Queries for textobject based navigation</a></h2>
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<p>Tree-sitter based navigation in Helix is done using captures in the
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following order:</p>
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<ul>
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<li><code>object.movement</code></li>
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<li><code>object.around</code></li>
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<li><code>object.inside</code></li>
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</ul>
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<p>For example if a <code>function.around</code> capture has been already defined for a language
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in its <code>textobjects.scm</code> file, function navigation should also work automatically.
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<code>function.movement</code> should be defined only if the node captured by <code>function.around</code>
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doesn't make sense in a navigation context.</p>
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</main>
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<!-- Mobile navigation buttons -->
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<a rel="prev" href="../guides/adding_languages.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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