<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta name="generator" content="AsciiDoc 8.6.8"> <title>Identifier</title> <link rel="stylesheet" href="./asciidoc.css" type="text/css"> <link rel="stylesheet" href="./pygments.css" type="text/css"> <script type="text/javascript" src="./asciidoc.js"></script> <script type="text/javascript"> /*<![CDATA[*/ asciidoc.install(); /*]]>*/ </script> <link rel="stylesheet" href="./mlton.css" type="text/css"/> </head> <body class="article"> <div id="banner"> <div id="banner-home"> <a href="./Home">MLton 20130715</a> </div> </div> <div id="header"> <h1>Identifier</h1> </div> <div id="content"> <div id="preamble"> <div class="sectionbody"> <div class="paragraph"><p>In <a href="StandardML">Standard ML</a>, there are syntactically two kinds of identifiers.</p></div> <div class="ulist"><ul> <li> <p> Alphanumeric: starts with a letter or prime (<span class="monospaced">'</span>) and is followed by letters, digits, primes and underbars (<span class="monospaced">_</span>). </p> <div class="paragraph"><p>Examples: <span class="monospaced">abc</span>, <span class="monospaced">ABC123</span>, <span class="monospaced">Abc_123</span>, <span class="monospaced">'a</span>.</p></div> </li> <li> <p> Symbolic: a sequence of the following </p> <div class="listingblock"> <div class="content monospaced"> <pre> ! % & $ # + - / : < = > ? @ | ~ ` ^ | *</pre> </div></div> <div class="paragraph"><p>Examples: <span class="monospaced">+=</span>, <span class="monospaced"><=</span>, <span class="monospaced">>></span>, <span class="monospaced">$</span>.</p></div> </li> </ul></div> <div class="paragraph"><p>With the exception of <span class="monospaced">=</span>, reserved words can not be identifiers.</p></div> <div class="paragraph"><p>There are a number of different classes of identifiers, some of which have additional syntactic rules.</p></div> <div class="ulist"><ul> <li> <p> Identifiers not starting with a prime. </p> <div class="ulist"><ul> <li> <p> value identifier (includes variables and constructors) </p> </li> <li> <p> type constructor </p> </li> <li> <p> structure identifier </p> </li> <li> <p> signature identifier </p> </li> <li> <p> functor identifier </p> </li> </ul></div> </li> <li> <p> Identifiers starting with a prime. </p> <div class="ulist"><ul> <li> <p> type variable </p> </li> </ul></div> </li> <li> <p> Identifiers not starting with a prime and numeric labels (<span class="monospaced">1</span>, <span class="monospaced">2</span>, …). </p> <div class="ulist"><ul> <li> <p> record label </p> </li> </ul></div> </li> </ul></div> </div> </div> </div> <div id="footnotes"><hr></div> <div id="footer"> <div id="footer-text"> </div> <div id="footer-badges"> </div> </div> </body> </html>
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