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