115 lines
5.3 KiB
HTML
115 lines
5.3 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>SRFI-105 (Guile Reference Manual)</title>
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<meta name="description" content="SRFI-105 (Guile Reference Manual)">
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<meta name="keywords" content="SRFI-105 (Guile Reference Manual)">
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<meta name="distribution" content="global">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="SRFI-Support.html" rel="up" title="SRFI Support">
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<link href="SRFI_002d111.html" rel="next" title="SRFI-111">
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<link href="SRFI_002d98.html" rel="prev" title="SRFI-98">
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</style>
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="SRFI_002d105">
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d111.html" accesskey="n" rel="next">SRFI-111 Boxes.</a>, Previous: <a href="SRFI_002d98.html" accesskey="p" rel="prev">SRFI-98 Accessing environment variables.</a>, Up: <a href="SRFI-Support.html" accesskey="u" rel="up">SRFI Support Modules</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>
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</div>
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<hr>
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<h4 class="subsection" id="SRFI_002d105-Curly_002dinfix-expressions_002e"><span>7.5.44 SRFI-105 Curly-infix expressions.<a class="copiable-link" href="#SRFI_002d105-Curly_002dinfix-expressions_002e"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-SRFI_002d105"></a>
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<a class="index-entry-id" id="index-curly_002dinfix"></a>
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<a class="index-entry-id" id="index-curly_002dinfix_002dand_002dbracket_002dlists"></a>
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<p>Guile’s built-in reader includes support for SRFI-105 curly-infix
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expressions. See <a class="uref" href="http://srfi.schemers.org/srfi-105/srfi-105.html">the specification of SRFI-105</a>. Some examples:
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</p>
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<div class="example">
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<pre class="example-preformatted">{n <= 5} ⇒ (<= n 5)
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{a + b + c} ⇒ (+ a b c)
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{a * {b + c}} ⇒ (* a (+ b c))
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{(- a) / b} ⇒ (/ (- a) b)
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{-(a) / b} ⇒ (/ (- a) b) as well
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{(f a b) + (g h)} ⇒ (+ (f a b) (g h))
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{f(a b) + g(h)} ⇒ (+ (f a b) (g h)) as well
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{f[a b] + g(h)} ⇒ (+ ($bracket-apply$ f a b) (g h))
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'{a + f(b) + x} ⇒ '(+ a (f b) x)
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{length(x) >= 6} ⇒ (>= (length x) 6)
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{n-1 + n-2} ⇒ (+ n-1 n-2)
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{n * factorial{n - 1}} ⇒ (* n (factorial (- n 1)))
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{{a > 0} and {b >= 1}} ⇒ (and (> a 0) (>= b 1))
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{f{n - 1}(x)} ⇒ ((f (- n 1)) x)
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{a . z} ⇒ ($nfx$ a . z)
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{a + b - c} ⇒ ($nfx$ a + b - c)
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</pre></div>
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<p>To enable curly-infix expressions within a file, place the reader
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directive <code class="code">#!curly-infix</code> before the first use of curly-infix
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notation. To globally enable curly-infix expressions in Guile’s reader,
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set the <code class="code">curly-infix</code> read option.
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</p>
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<p>Guile also implements the following non-standard extension to SRFI-105:
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if <code class="code">curly-infix</code> is enabled and there is no other meaning assigned
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to square brackets (i.e. the <code class="code">square-brackets</code> read option is
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turned off), then lists within square brackets are read as normal lists
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but with the special symbol <code class="code">$bracket-list$</code> added to the front.
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To enable this combination of read options within a file, use the reader
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directive <code class="code">#!curly-infix-and-bracket-lists</code>. For example:
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</p>
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<div class="example">
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<pre class="example-preformatted">[a b] ⇒ ($bracket-list$ a b)
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[a . b] ⇒ ($bracket-list$ a . b)
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</pre></div>
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<p>For more information on reader options, See <a class="xref" href="Scheme-Read.html">Reading Scheme Code</a>.
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</p>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d111.html">SRFI-111 Boxes.</a>, Previous: <a href="SRFI_002d98.html">SRFI-98 Accessing environment variables.</a>, Up: <a href="SRFI-Support.html">SRFI Support Modules</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>
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</div>
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</body>
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</html>
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