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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background: #dedede; color: #111; font-family: monospace;
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box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
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padding: 7px;
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display: block;
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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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Most words in RETRO have a stack comment. These look like:
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<br/><br/>
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<tt class='indentedcode'>(-)</tt>
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<tt class='indentedcode'>(nn-n)</tt>
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<br/><br/>
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As with all comments, a stack comment begins with <span class="tt">(</span> and
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should end with a <span class="tt">)</span>. There are two parts to the comment.
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On the left side of the <span class="tt">-</span> is what the word <strong>consumes</strong>. On
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the right is what it <strong>leaves</strong>.
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<br/><br/>
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RETRO uses a short notation, with one character per value
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taken or left. In general, the following symbols represent
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certain types of values.
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<br/><br/>
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<tt class='indentedcode'>| Notation | Represents |</tt>
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<tt class='indentedcode'>| ------------------- | ----------------------- |</tt>
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<tt class='indentedcode'>| b, n, m, o, x, y, z | generic numeric values |</tt>
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<tt class='indentedcode'>| s | string |</tt>
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<tt class='indentedcode'>| v | variable |</tt>
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<tt class='indentedcode'>| p, a | pointers |</tt>
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<tt class='indentedcode'>| q | quotation |</tt>
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<tt class='indentedcode'>| d | dictionary header |</tt>
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<tt class='indentedcode'>| f | `TRUE` or `FALSE` flag. |</tt>
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<br/><br/>
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In the case of something like <span class="tt">(xyz-m)</span>, RETRO expects z to be
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on the top of the stack, with y below it and x below the y
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value. And after execution, a single value (m) will be left on
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the stack.
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<br/><br/>
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Words with no stack effect have a comment of (-)
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2021-08-05 13:04:25 +02:00
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<br/><br/>
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For combinators (words consuming quotations), you can include
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a sub-comment indicating the expected stack effect of the
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quote. E.g.,
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<br/><br/>
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<tt class='indentedcode'>(q(-f)-)</tt>
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<br/><br/>
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Indicates a word consuming a quote and returning nothing. The
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quote should return a flag.
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2021-01-21 13:40:28 +01:00
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</p>
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</body></html>
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