91 lines
4.6 KiB
HTML
91 lines
4.6 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<!-- This manual documents Guile version 3.0.10.
|
|
|
|
Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
|
|
Inc.
|
|
|
|
Copyright (C) 2021 Maxime Devos
|
|
|
|
Copyright (C) 2024 Tomas Volf
|
|
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with no
|
|
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
|
|
copy of the license is included in the section entitled "GNU Free
|
|
Documentation License." -->
|
|
<title>LALR(1) Parsing (Guile Reference Manual)</title>
|
|
|
|
<meta name="description" content="LALR(1) Parsing (Guile Reference Manual)">
|
|
<meta name="keywords" content="LALR(1) Parsing (Guile Reference Manual)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content=".texi2any-real">
|
|
<meta name="viewport" content="width=device-width,initial-scale=1">
|
|
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="API-Reference.html" rel="up" title="API Reference">
|
|
<link href="PEG-Parsing.html" rel="next" title="PEG Parsing">
|
|
<link href="Regular-Expressions.html" rel="prev" title="Regular Expressions">
|
|
<style type="text/css">
|
|
<!--
|
|
a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
|
|
span:hover a.copiable-link {visibility: visible}
|
|
strong.def-name {font-family: monospace; font-weight: bold; font-size: larger}
|
|
-->
|
|
</style>
|
|
<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<div class="section-level-extent" id="LALR_00281_0029-Parsing">
|
|
<div class="nav-panel">
|
|
<p>
|
|
Next: <a href="PEG-Parsing.html" accesskey="n" rel="next">PEG Parsing</a>, Previous: <a href="Regular-Expressions.html" accesskey="p" rel="prev">Regular Expressions</a>, Up: <a href="API-Reference.html" accesskey="u" rel="up">API Reference</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<h3 class="section" id="LALR_00281_0029-Parsing-1"><span>6.14 LALR(1) Parsing<a class="copiable-link" href="#LALR_00281_0029-Parsing-1"> ¶</a></span></h3>
|
|
|
|
<p>The <code class="code">(system base lalr)</code> module provides the
|
|
<a class="uref" href="https://github.com/schemeway/lalr-scm/"><code class="code">lalr-scm</code> LALR(1) parser
|
|
generator by Dominique Boucher</a>. <code class="code">lalr-scm</code> uses the same algorithm as GNU
|
|
Bison (see <a data-manual="bison" href="https://www.gnu.org/software/bison/manual/html_node/Introduction.html#Introduction">Introduction to Bison</a> in <cite class="cite">Bison, The
|
|
Yacc-compatible Parser Generator</cite>). Parsers are defined using the
|
|
<code class="code">lalr-parser</code> macro.
|
|
</p>
|
|
<dl class="first-deffn">
|
|
<dt class="deffn" id="index-lalr_002dparser"><span class="category-def">Scheme Syntax: </span><span><strong class="def-name">lalr-parser</strong> <var class="def-var-arguments">[<var class="var">options</var>] <var class="var">tokens</var> <var class="var">rules</var>...</var><a class="copiable-link" href="#index-lalr_002dparser"> ¶</a></span></dt>
|
|
<dd><p>Generate an LALR(1) syntax analyzer. <var class="var">tokens</var> is a list of symbols
|
|
representing the terminal symbols of the grammar. <var class="var">rules</var> are the grammar
|
|
production rules.
|
|
</p>
|
|
<p>Each rule has the form <code class="code">(<var class="var">non-terminal</var> (<var class="var">rhs</var> ...) : <var class="var">action</var>
|
|
...)</code>, where <var class="var">non-terminal</var> is the name of the rule, <var class="var">rhs</var> are the
|
|
right-hand sides, i.e., the production rule, and <var class="var">action</var> is a semantic
|
|
action associated with the rule.
|
|
</p>
|
|
<p>The generated parser is a two-argument procedure that takes a
|
|
<em class="dfn">tokenizer</em> and a <em class="dfn">syntax error procedure</em>. The tokenizer
|
|
should be a thunk that returns lexical tokens as produced by
|
|
<code class="code">make-lexical-token</code>. The syntax error procedure may be called
|
|
with at least an error message (a string), and optionally the lexical
|
|
token that caused the error.
|
|
</p></dd></dl>
|
|
|
|
<p>Please refer to the <code class="code">lalr-scm</code> documentation for details.
|
|
</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|