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+<title>Parsing Program Source (GNU Emacs Lisp Reference Manual)</title>
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+<div class="chapter" id="Parsing-Program-Source">
+<div class="header">
+<p>
+Next: <a href="Abbrevs.html" accesskey="n" rel="next">Abbrevs and Abbrev Expansion</a>, Previous: <a href="Syntax-Tables.html" accesskey="p" rel="prev">Syntax Tables</a>, Up: <a href="index.html" accesskey="u" rel="up">Emacs Lisp</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<span id="Parsing-Program-Source-1"></span><h2 class="chapter">37 Parsing Program Source</h2>
+
+<span id="index-syntax-tree_002c-from-parsing-program-source"></span>
+<p>Emacs provides various ways to parse program source text and produce a
+<em>syntax tree</em>.  In a syntax tree, text is no longer considered a
+one-dimensional stream of characters, but a structured tree of nodes,
+where each node representing a piece of text.  Thus, a syntax tree can
+enable interesting features like precise fontification, indentation,
+navigation, structured editing, etc.
+</p>
+<p>Emacs has a simple facility for parsing balanced expressions
+(see <a href="Parsing-Expressions.html">Parsing Expressions</a>).  There is also the SMIE library for
+generic navigation and indentation (see <a href="SMIE.html">Simple Minded Indentation Engine</a>).
+</p>
+<p>In addition to those, Emacs also provides integration with
+<a href="https://tree-sitter.github.io/tree-sitter">the tree-sitter
+library</a>) if support for it was compiled in.  The tree-sitter library
+implements an incremental parser and has support from a wide range of
+programming languages.
+</p>
+<dl class="def">
+<dt id="index-treesit_002davailable_002dp"><span class="category">Function: </span><span><strong>treesit-available-p</strong><a href='#index-treesit_002davailable_002dp' class='copiable-anchor'> &para;</a></span></dt>
+<dd><p>This function returns non-<code>nil</code> if tree-sitter features are
+available for the current Emacs session.
+</p></dd></dl>
+
+<p>To be able to parse the program source using the tree-sitter library
+and access the syntax tree of the program, a Lisp program needs to
+load a language definition library, and create a parser for that
+language and the current buffer.  After that, the Lisp program can
+query the parser about specific nodes of the syntax tree.  Then, it
+can access various kinds of information about each node, and search
+for nodes using a powerful pattern-matching syntax.  This chapter
+explains how to do all this, and also how a Lisp program can work with
+source files that mix multiple programming languages.
+</p>
+
+<ul class="section-toc">
+<li><a href="Language-Definitions.html" accesskey="1">Tree-sitter Language Definitions</a></li>
+<li><a href="Using-Parser.html" accesskey="2">Using Tree-sitter Parser</a></li>
+<li><a href="Retrieving-Nodes.html" accesskey="3">Retrieving Nodes</a></li>
+<li><a href="Accessing-Node-Information.html" accesskey="4">Accessing Node Information</a></li>
+<li><a href="Pattern-Matching.html" accesskey="5">Pattern Matching Tree-sitter Nodes</a></li>
+<li><a href="Multiple-Languages.html" accesskey="6">Parsing Text in Multiple Languages</a></li>
+<li><a href="Tree_002dsitter-major-modes.html" accesskey="7">Developing major modes with tree-sitter</a></li>
+<li><a href="Tree_002dsitter-C-API.html" accesskey="8">Tree-sitter C API Correspondence</a></li>
+</ul>
+</div>
+<hr>
+<div class="header">
+<p>
+Next: <a href="Abbrevs.html">Abbrevs and Abbrev Expansion</a>, Previous: <a href="Syntax-Tables.html">Syntax Tables</a>, Up: <a href="index.html">Emacs Lisp</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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