2021-01-21 13:40:28 +01:00
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head>
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<title>.</title>
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<style type="text/css">
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* { color: #000; background: #fff; max-width: 700px; }
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tt, pre { background: #dedede; color: #111; font-family: monospace;
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white-space: pre; display: block; width: 100%; }
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padding: 7px;
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</style>
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</head><body>
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2022-06-03 12:41:52 +02:00
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<p><br/><br/>
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2021-01-21 13:40:28 +01:00
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RETRO provides words for working with ASCII characters.
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<br/><br/>
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2021-03-30 13:58:25 +02:00
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<span class="h2">Sigil</span>
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2021-01-21 13:40:28 +01:00
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<br/><br/>
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2021-03-30 13:58:25 +02:00
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Character constants are returned using the <span class="tt">$</span> sigil.
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2021-01-21 13:40:28 +01:00
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<br/><br/>
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<span class="h2">Namespace</span>
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<br/><br/>
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Words operating on characters are in the <span class="tt">c:</span> namespace.
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<br/><br/>
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<span class="h2">Classification</span>
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<br/><br/>
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RETRO provides a number of words to determine if a character
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fits into predefined groups.
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<br/><br/>
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The primary words for this are:
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<br/><br/>
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• <span class="tt">c:consonant?</span><br/>
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• <span class="tt">c:digit?</span><br/>
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• <span class="tt">c:letter?</span><br/>
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• <span class="tt">c:lowercase?</span><br/>
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• <span class="tt">c:uppercase?</span><br/>
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• <span class="tt">c:visible?</span><br/>
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• <span class="tt">c:vowel?</span><br/>
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• <span class="tt">c:whitespace?</span><br/>
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<br/><br/>
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There are also corresponding "not" forms:
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<br/><br/>
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• <span class="tt">c:-consonant?</span><br/>
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• <span class="tt">c:-digit?</span><br/>
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• <span class="tt">c:-lowercase?</span><br/>
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• <span class="tt">c:-uppercase?</span><br/>
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• <span class="tt">c:-visible?</span><br/>
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• <span class="tt">c:-vowel?</span><br/>
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• <span class="tt">c:-whitespace?</span><br/>
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<br/><br/>
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All of these take a character and return either a <span class="tt">TRUE</span> or
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<span class="tt">FALSE</span> flag.
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<br/><br/>
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<span class="h2">Conversions</span>
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<br/><br/>
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A few words are provided to convert case. Each takes a character
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and returns the modified character.
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<br/><br/>
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• <span class="tt">c:to-lower</span><br/>
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• <span class="tt">c:to-number</span><br/>
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• <span class="tt">c:to-upper</span><br/>
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• <span class="tt">c:toggle-case</span><br/>
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<br/><br/>
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RETRO also has <span class="tt">c:to-string</span>, which takes a character and
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creates a new temporary string with the character.
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<br/><br/>
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<span class="h2">I/O</span>
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<br/><br/>
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Characters can be displayed using <span class="tt">c:put</span>.
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<br/><br/>
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<span class='codeblock'><span class="tt">```</span><br/><span class="tt"><span class='char'>$a</span> c:put </span><br/>
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<span class="tt">```</span></span><br/><br/>
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With the default system on BSD, Linux, and macOS (and other
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Unix style hosts), <span class="tt">c:get</span> is provided to read input. This
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may be buffered, depending on the host.
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</p>
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</body></html>
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