124 lines
5.5 KiB
HTML
124 lines
5.5 KiB
HTML
<!DOCTYPE html>
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<html>
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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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Documentation License." -->
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<title>Runtime Options (Guile Reference Manual)</title>
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<meta name="description" content="Runtime Options (Guile Reference Manual)">
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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="Options-and-Config.html" rel="up" title="Options and Config">
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<link href="Feature-Tracking.html" rel="prev" title="Feature Tracking">
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<body lang="en">
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<div class="subsection-level-extent" id="Runtime-Options">
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<div class="nav-panel">
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<p>
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Previous: <a href="Feature-Tracking.html" accesskey="p" rel="prev">Feature Tracking</a>, Up: <a href="Options-and-Config.html" accesskey="u" rel="up">Configuration, Features and Runtime Options</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="Runtime-Options-1"><span>6.23.3 Runtime Options<a class="copiable-link" href="#Runtime-Options-1"> ¶</a></span></h4>
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<p>There are a number of runtime options available for parameterizing
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built-in procedures, like <code class="code">read</code>, and built-in behavior, like what
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happens on an uncaught error.
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</p>
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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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<p>For more information on print options, See <a class="xref" href="Scheme-Write.html">Writing Scheme Values</a>.
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</p>
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<p>Finally, for more information on debugger options, See <a class="xref" href="Debug-Options.html">Debug options</a>.
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</p>
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<ul class="mini-toc">
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<li><a href="#Examples-of-option-use" accesskey="1">Examples of option use</a></li>
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</ul>
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<div class="subsubsection-level-extent" id="Examples-of-option-use">
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<h4 class="subsubsection"><span>6.23.3.1 Examples of option use<a class="copiable-link" href="#Examples-of-option-use"> ¶</a></span></h4>
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<p>Here is an example of a session in which some read and debug option
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handling procedures are used. In this example, the user
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</p>
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<ol class="enumerate">
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<li> Notices that the symbols <code class="code">abc</code> and <code class="code">aBc</code> are not the same
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</li><li> Examines the <code class="code">read-options</code>, and sees that <code class="code">case-insensitive</code>
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is set to “no”.
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</li><li> Enables <code class="code">case-insensitive</code>
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</li><li> Quits the recursive prompt
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</li><li> Verifies that now <code class="code">aBc</code> and <code class="code">abc</code> are the same
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</li></ol>
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<div class="example smalllisp lisp">
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<pre class="lisp-preformatted">scheme@(guile-user)> (define abc "hello")
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scheme@(guile-user)> abc
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$1 = "hello"
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scheme@(guile-user)> aBc
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<unknown-location>: warning: possibly unbound variable `aBc'
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ERROR: In procedure module-lookup:
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ERROR: Unbound variable: aBc
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Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue.
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scheme@(guile-user) [1]> (read-options 'help)
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copy no Copy source code expressions.
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positions yes Record positions of source code expressions.
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case-insensitive no Convert symbols to lower case.
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keywords #f Style of keyword recognition: #f, 'prefix or 'postfix.
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r6rs-hex-escapes no Use R6RS variable-length character and string hex escapes.
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square-brackets yes Treat `[' and `]' as parentheses, for R6RS compatibility.
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hungry-eol-escapes no In strings, consume leading whitespace after an
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escaped end-of-line.
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curly-infix no Support SRFI-105 curly infix expressions.
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scheme@(guile-user) [1]> (read-enable 'case-insensitive)
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$2 = (square-brackets keywords #f case-insensitive positions)
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scheme@(guile-user) [1]> ,q
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scheme@(guile-user)> aBc
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$3 = "hello"
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</pre></div>
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</div>
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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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Previous: <a href="Feature-Tracking.html">Feature Tracking</a>, Up: <a href="Options-and-Config.html">Configuration, Features and Runtime Options</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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