https://www.memcp.org/index.php?action=history&feed=atom&title=Parsers 2026-04-24T16:52:16Z Revision history for this page on the wiki MediaWiki 1.39.1 https://www.memcp.org/index.php?title=Parsers&diff=229&oldid=prev 2025-08-25T16:51:54Z

<p>Created page with &quot;= Parsers = The &#039;&#039;&#039;Parsers&#039;&#039;&#039; module provides parsing functionality for the SCM programming language. This module includes: * &#039;&#039;&#039;Parser creation&#039;&#039;&#039;: Functions to create custom parsers using grammar syntax (parser) * &#039;&#039;&#039;Grammar support&#039;&#039;&#039;: Support for various parser types including AtomParser, RegexParser, AndParser, OrParser, KleeneParser, ManyParser, MaybeParser, and more * &#039;&#039;&#039;Packrat parsing&#039;&#039;&#039;: Implementation of packrat parsing algorithms for efficient parsing * &#039;&#039;&#039;...&quot;</p> <p><b>New page</b></p><div>= Parsers =<br /> <br /> The &#039;&#039;&#039;Parsers&#039;&#039;&#039; module provides parsing functionality for the SCM programming language. This module includes:<br /> <br /> * &#039;&#039;&#039;Parser creation&#039;&#039;&#039;: Functions to create custom parsers using grammar syntax (parser)<br /> * &#039;&#039;&#039;Grammar support&#039;&#039;&#039;: Support for various parser types including AtomParser, RegexParser, AndParser, OrParser, KleeneParser, ManyParser, MaybeParser, and more<br /> * &#039;&#039;&#039;Packrat parsing&#039;&#039;&#039;: Implementation of packrat parsing algorithms for efficient parsing<br /> * &#039;&#039;&#039;Whitespace handling&#039;&#039;&#039;: Configurable whitespace skipping mechanisms<br /> <br /> These functions provide essential tools for creating custom parsers and processing structured text data in SCM programs.<br /> <br /> ← Back to [[Full SCM API documentation]]<br /> <br /> == parser ==<br /> <br /> creates a parser<br /> <br /> SCM parsers work this way:<br /> &lt;code&gt;(parser syntax scmerresult) -&gt; func&lt;/code&gt;<br /> <br /> syntax can be one of:<br /> * &lt;code&gt;(parser syntax scmerresult)&lt;/code&gt; will execute scmerresult after parsing syntax<br /> * &lt;code&gt;(parser syntax scmerresult &quot;skipper&quot;)&lt;/code&gt; will add a different whitespace skipper regex to the root parser<br /> * &lt;code&gt;(define var syntax)&lt;/code&gt; valid inside &lt;code&gt;(parser...)&lt;/code&gt;, stores the result of syntax into var for use in scmerresult<br /> * &lt;code&gt;&quot;str&quot;&lt;/code&gt; AtomParser<br /> * &lt;code&gt;(atom &quot;str&quot; caseinsensitive skipws)&lt;/code&gt; AtomParser<br /> * &lt;code&gt;(regex &quot;asdf&quot; caseinsensitive skipws)&lt;/code&gt; RegexParser<br /> * &lt;code&gt;&#039;(a b c)&lt;/code&gt; AndParser<br /> * &lt;code&gt;(or a b c)&lt;/code&gt; OrParser<br /> * &lt;code&gt;(* sub separator)&lt;/code&gt; KleeneParser<br /> * &lt;code&gt;(+ sub separator)&lt;/code&gt; ManyParser<br /> * &lt;code&gt;(? xyz)&lt;/code&gt; MaybeParser (if &gt;1 AndParser)<br /> * &lt;code&gt;(not mainparser parser1 parser2 parser3 ...)&lt;/code&gt; a parser that matches mainparser but not parser1...<br /> * &lt;code&gt;$&lt;/code&gt; EndParser<br /> * &lt;code&gt;empty&lt;/code&gt; EmptyParser<br /> * &lt;code&gt;symbol&lt;/code&gt; -&gt; use other parser defined in env<br /> <br /> For further details on packrat parsers, take a look at https://github.com/launix-de/go-packrat<br /> <br /> &#039;&#039;&#039;Allowed number of parameters:&#039;&#039;&#039; 1–3<br /> <br /> &#039;&#039;&#039;Parameters:&#039;&#039;&#039;<br /> * &#039;&#039;&#039;syntax&#039;&#039;&#039; (&lt;code&gt;any&lt;/code&gt;): syntax of the grammar (see docs)<br /> * &#039;&#039;&#039;generator&#039;&#039;&#039; (&lt;code&gt;any&lt;/code&gt;): (optional) expressions to evaluate. All captured variables are available in the scope.<br /> * &#039;&#039;&#039;skipper&#039;&#039;&#039; (&lt;code&gt;string&lt;/code&gt;): (optional) string that defines the skip mechanism for whitespaces as regexp<br /> <br /> &#039;&#039;&#039;Returns:&#039;&#039;&#039; &lt;code&gt;func&lt;/code&gt;</div>

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