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<section id="exploring-the-structure-of-your-source-code">
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<span id="id1"></span><h1>Exploring the structure of your source code<a class="headerlink" href="#exploring-the-structure-of-your-source-code" title="Link to this heading">¶</a></h1>
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<p>You can use the AST viewer to display the abstract syntax tree of a CodeQL database.</p>
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<section id="about-the-abstract-syntax-tree">
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<h2>About the abstract syntax tree<a class="headerlink" href="#about-the-abstract-syntax-tree" title="Link to this heading">¶</a></h2>
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<p>The abstract syntax tree (AST) of a program represents the program’s syntactic structure. Nodes on the AST represent elements such as statements and expressions.
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A CodeQL database encodes these program elements and the relationships between them through a <a class="reference internal" href="../codeql-overview/codeql-glossary.html#codeql-database-schema"><span class="std std-ref">database schema</span></a>.</p>
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<p>CodeQL for Visual Studio Code contains an AST viewer. The viewer consists of a graph visualization view that lets you explore the AST of a file in a CodeQL database. This helps you see which CodeQL classes correspond to which parts of your source files.</p>
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</section>
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<section id="viewing-the-abstract-syntax-tree-of-a-source-file">
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<h2>Viewing the abstract syntax tree of a source file<a class="headerlink" href="#viewing-the-abstract-syntax-tree-of-a-source-file" title="Link to this heading">¶</a></h2>
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<ol class="arabic">
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<li><p>Open a source file from a CodeQL database. For example, you can navigate to a source file in the File Explorer.</p>
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<a class="reference internal image-reference" href="../_images/open-source-file.png"><img alt="Open a source file" src="../_images/open-source-file.png" style="width: 350px;" /></a>
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</li>
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<li><p>Run <strong>CodeQL: View AST</strong> from the Command Palette. This runs a CodeQL query (usually called <code class="docutils literal notranslate"><span class="pre">printAST.ql</span></code>) over the active file, which may take a few seconds.</p>
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<blockquote class="pull-quote">
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<div><p>Note</p>
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<p>If you don’t have an appropriate <code class="docutils literal notranslate"><span class="pre">printAST.ql</span></code> query in your workspace, the <strong>CodeQL: View AST</strong> command won’t work. To fix this, you can update your copy of the <a class="reference external" href="https://github.com/github/codeql">CodeQL</a> repository (or <a class="reference external" href="https://github.com/github/codeql-go">CodeQL for Go</a> repository) from <code class="docutils literal notranslate"><span class="pre">main</span></code>. If you do this, you may need to upgrade your databases. Also, query caches may be discarded and your next query runs could be slower.</p>
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<li><p>Once the query has run, the AST viewer displays the structure of the source file.</p></li>
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<li><p>To see the nested structure, click the arrows and expand the nodes.</p>
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<img alt="Explore the AST" src="../_images/explore-ast.png" />
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<p>You can click a node in the AST viewer to jump to it in the source code. Conversely, if you click a section of the source code, the AST viewer displays the corresponding node.</p>
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