86 lines
3.3 KiB
HTML
86 lines
3.3 KiB
HTML
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<html lang="en">
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<head>
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<title>Files - Enigma</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Enigma">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Language.html#Language" title="Language">
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<link rel="prev" href="Booleans.html#Booleans" title="Booleans">
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<link rel="next" href="Functions.html#Functions" title="Functions">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This manual is for Enigma, version 0.1.
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Copyright (C) 2010 Niels Serup
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Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License,
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Version 1.3 or any later version published by the Free Software
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Foundation; with no Invariant Sections, no Front-Cover Texts, and
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no Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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This document is also available under the terms of the Creative
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Commons Attribution-Share Alike 3.0 (or any later version)
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Unported license. A copy of the license is available at
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`http://creativecommons.org/licenses/by-sa/3.0/legalcode'.
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-->
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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Files"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Functions.html#Functions">Functions</a>,
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Previous: <a rel="previous" accesskey="p" href="Booleans.html#Booleans">Booleans</a>,
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Up: <a rel="up" accesskey="u" href="Language.html#Language">Language</a>
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<hr>
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</div>
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<h3 class="section">2.6 Files</h3>
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<p><a name="index-files-9"></a>Files can only be created using the built-in function <code>open</code>. Files
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are either readable or writeable. If a file is writeable, text written
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to the file may optionally be appended to any existing text.
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<p><a name="index-read-10"></a><a name="index-write-11"></a><a name="index-open-12"></a><a name="index-close-13"></a>
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<pre class="verbatim">"a" "r" ! open = f1;
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"b" "w" ! open = f2;
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"c" "a" ! open = f3;
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# Read one character
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f1 ! read | stdout temp ! write;
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# Write a string
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f2 "Aaar" ! write;
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# Append a string
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f3 "Ouu" ! write;
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f1!close;f2!close;f3!close;
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</pre>
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<p>To read an entire file, one must use a loop
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construct. See <a href="Loops.html#Loops">Loops</a>. When there are no more characters left, the
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<code>read</code> function returns an empty string. Using equality testing,
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reading a complete file is thus possible. See <a href="Conditionals.html#Conditionals">Conditionals</a>.
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<pre class="verbatim">filename "r" ! open = f;
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{f ! read = c; stdout c ! write; c "" ! equal ! not = return;} ! loop;
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</pre>
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<p>At this point, it may not be obvious why this works. This will be
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explained in the next sections.
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</body></html>
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