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282 lines
16 KiB
HTML
282 lines
16 KiB
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<title>Syntax aware motions</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><ol class="section"><li class="chapter-item expanded "><a href="package-managers.html"><strong aria-hidden="true">1.1.</strong> Package Managers</a></li><li class="chapter-item expanded "><a href="building-from-source.html"><strong aria-hidden="true">1.2.</strong> Building from source</a></li></ol></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="registers.html"><strong aria-hidden="true">2.1.</strong> Registers</a></li><li class="chapter-item expanded "><a href="surround.html"><strong aria-hidden="true">2.2.</strong> Surround</a></li><li class="chapter-item expanded "><a href="textobjects.html"><strong aria-hidden="true">2.3.</strong> Textobjects</a></li><li class="chapter-item expanded "><a href="syntax-aware-motions.html" class="active"><strong aria-hidden="true">2.4.</strong> Syntax aware motions</a></li><li class="chapter-item expanded "><a href="keymap.html"><strong aria-hidden="true">2.5.</strong> Keymap</a></li><li class="chapter-item expanded "><a href="commands.html"><strong aria-hidden="true">2.6.</strong> Commands</a></li><li class="chapter-item expanded "><a href="lang-support.html"><strong aria-hidden="true">2.7.</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="editor.html"><strong aria-hidden="true">4.1.</strong> Editor</a></li><li class="chapter-item expanded "><a href="themes.html"><strong aria-hidden="true">4.2.</strong> Themes</a></li><li class="chapter-item expanded "><a href="remapping.html"><strong aria-hidden="true">4.3.</strong> Key remapping</a></li><li class="chapter-item expanded "><a href="languages.html"><strong aria-hidden="true">4.4.</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"><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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<main>
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<h2 id="moving-the-selection-with-syntax-aware-motions"><a class="header" href="#moving-the-selection-with-syntax-aware-motions">Moving the selection with syntax-aware motions</a></h2>
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<p><code>Alt-p</code>, <code>Alt-o</code>, <code>Alt-i</code>, and <code>Alt-n</code> (or <code>Alt</code> and arrow keys) allow you to move the
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selection according to its location in the syntax tree. For example, many languages have the
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following syntax for function calls:</p>
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<pre><code class="language-js">func(arg1, arg2, arg3);
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</code></pre>
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<p>A function call might be parsed by tree-sitter into a tree like the following.</p>
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<pre><code class="language-tsq">(call
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function: (identifier) ; func
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arguments:
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(arguments ; (arg1, arg2, arg3)
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(identifier) ; arg1
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(identifier) ; arg2
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(identifier))) ; arg3
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</code></pre>
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<p>Use <code>:tree-sitter-subtree</code> to view the syntax tree of the primary selection. In
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a more intuitive tree format:</p>
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<pre><code> ┌────┐
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│call│
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┌─────┴────┴─────┐
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│ │
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┌─────▼────┐ ┌────▼────┐
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│identifier│ │arguments│
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│ "func" │ ┌────┴───┬─────┴───┐
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└──────────┘ │ │ │
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│ │ │
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┌─────────▼┐ ┌────▼─────┐ ┌▼─────────┐
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│identifier│ │identifier│ │identifier│
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│ "arg1" │ │ "arg2" │ │ "arg3" │
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└──────────┘ └──────────┘ └──────────┘
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</code></pre>
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<p>If you have a selection that wraps <code>arg1</code> (see the tree above), and you use
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<code>Alt-n</code>, it will select the next sibling in the syntax tree: <code>arg2</code>.</p>
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<pre><code class="language-js">// before
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func([arg1], arg2, arg3)
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// after
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func(arg1, [arg2], arg3);
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</code></pre>
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<p>Similarly, <code>Alt-o</code> will expand the selection to the parent node, in this case, the
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arguments node.</p>
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<pre><code class="language-js">func[(arg1, arg2, arg3)];
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</code></pre>
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<p>There is also some nuanced behavior that prevents you from getting stuck on a
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node with no sibling. When using <code>Alt-p</code> with a selection on <code>arg1</code>, the previous
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child node will be selected. In the event that <code>arg1</code> does not have a previous
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sibling, the selection will move up the syntax tree and select the previous
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element. As a result, using <code>Alt-p</code> with a selection on <code>arg1</code> will move the
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selection to the "func" <code>identifier</code>.</p>
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</main>
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<a rel="prev" href="textobjects.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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