1849 lines
54 KiB
HTML
1849 lines
54 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="">
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<meta name="keywords" content="devdocs, documentation, jekyll, markdown">
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<title>Writing documentation | PMD Source Code Analyzer</title>
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<link rel="stylesheet" href="css/syntax.css">
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<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
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<!--<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">-->
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<link rel="stylesheet" href="css/modern-business.css">
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<link rel="stylesheet" href="css/lavish-bootstrap.css">
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<link rel="stylesheet" href="css/customstyles.css">
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<link rel="stylesheet" href="css/theme-blue.css">
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<link rel="stylesheet" href="css/pmd-customstyles.css">
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<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js"></script>
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<script src="js/jquery.navgoco.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/anchor-js/2.0.0/anchor.min.js"></script>
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<script src="js/toc.js"></script>
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<script src="js/customscripts.js"></script>
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<link rel="shortcut icon" href="images/favicon.ico" type="image/x-icon">
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<link rel="icon" href="images/favicon.ico" type="image/x-icon">
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<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
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<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
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<!--[if lt IE 9]>
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<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
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<script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
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<![endif]-->
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<link rel="alternate" type="application/rss+xml" title="" href="https://pmd.github.io/pmd/feed.xml">
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<script>
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$(document).ready(function() {
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// Initialize navgoco with default options
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$("#mysidebar").navgoco({
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caretHtml: '',
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accordion: true,
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openClass: 'active', // open
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save: false, // leave false or nav highlighting doesn't work right
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cookie: {
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name: 'navgoco',
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expires: false,
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path: '/'
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},
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slide: {
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duration: 400,
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easing: 'swing'
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}
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});
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$("#collapseAll").click(function(e) {
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e.preventDefault();
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$("#mysidebar").navgoco('toggle', false);
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});
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$("#expandAll").click(function(e) {
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e.preventDefault();
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$("#mysidebar").navgoco('toggle', true);
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});
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});
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</script>
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<script>
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$(function () {
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$('[data-toggle="tooltip"]').tooltip()
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})
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</script>
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<script>
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$(document).ready(function() {
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$("#tg-sb-link").click(function() {
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$("#tg-sb-sidebar").toggle();
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$("#tg-sb-content").toggleClass('col-md-9');
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$("#tg-sb-content").toggleClass('col-md-12');
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$("#tg-sb-icon").toggleClass('fa-toggle-on');
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$("#tg-sb-icon").toggleClass('fa-toggle-off');
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});
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});
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</script>
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</head>
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<body>
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<!-- Content is offset by the height of the topnav bar. -->
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<!-- There's already a padding-top rule in modern-business.css, but it apparently doesn't work on Firefox 60 and Chrome 67 -->
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<div id="topbar-content-offset">
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<!-- Navigation -->
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<nav class="navbar navbar-inverse navbar-fixed-top">
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<div class="container topnavlinks">
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<div class="navbar-header">
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<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
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<span class="sr-only">Toggle navigation</span>
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<span class="icon-bar"></span>
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<span class="icon-bar"></span>
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<span class="icon-bar"></span>
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</button>
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<a class="fa fa-home fa-lg navbar-brand" href="index.html"> <span class="projectTitle"> PMD Source Code Analyzer Project</span></a>
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</div>
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<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
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<ul class="nav navbar-nav navbar-right">
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<!-- toggle sidebar button -->
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<li><a id="tg-sb-link" href="#"><i id="tg-sb-icon" class="fa fa-toggle-on"></i> Nav</a></li>
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<!-- entries without drop-downs appear here -->
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<li><a href="https://github.com/pmd/pmd/releases/latest" target="_blank">Download</a></li>
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<li><a href="https://github.com/pmd/pmd" target="_blank">Fork us on github</a></li>
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<!-- entries with drop-downs appear here -->
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<!-- conditional logic to control which topnav appears for the audience defined in the configuration file.-->
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<!--comment out this block if you want to hide search-->
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<li>
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<!--start search-->
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<div id="search-demo-container">
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<input type="text" id="search-input" placeholder="search...">
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<ul id="results-container"></ul>
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</div>
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<script src="js/jekyll-search.js" type="text/javascript"></script>
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<script type="text/javascript">
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SimpleJekyllSearch.init({
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searchInput: document.getElementById('search-input'),
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resultsContainer: document.getElementById('results-container'),
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dataSource: 'search.json',
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searchResultTemplate: '<li><a href="{url}" title="Writing documentation">{title}</a></li>',
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noResultsText: 'No results found.',
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limit: 10,
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fuzzy: true,
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})
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</script>
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<!--end search-->
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</li>
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</ul>
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</div>
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</div>
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<!-- /.container -->
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</nav>
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<!-- Page Content -->
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<div class="container-toc-wrapper">
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<div class="container">
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<div class="col-lg-12"> </div>
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<!-- Content Row -->
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<div class="row">
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<!-- Sidebar Column -->
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<div class="col-md-3" id="tg-sb-sidebar">
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<ul id="mysidebar" class="nav">
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<li class="sidebarTitle">PMD 6.50.0-SNAPSHOT</li>
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<div class="sidebarTitleDate">Release date: 30-September-2022</div>
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<li>
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<a href="#">About</a>
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<ul>
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<li><a href="index.html">Home</a></li>
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<li><a href="pmd_release_notes.html">Release notes</a></li>
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||
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||
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||
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||
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||
<li><a href="pmd_next_major_development.html">PMD 7.0.0 development</a></li>
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||
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||
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||
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||
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<li><a href="pmd_about_help.html">Getting help</a></li>
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||
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||
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||
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||
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||
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||
</ul>
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||
</li>
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||
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<li>
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<a href="#">User Documentation</a>
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||
|
||
<ul>
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||
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||
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||
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||
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<li><a href="pmd_userdocs_installation.html">Installation and basic CLI usage</a></li>
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||
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||
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||
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||
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||
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||
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||
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||
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||
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<li><a href="pmd_userdocs_making_rulesets.html">Making rulesets</a></li>
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||
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||
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||
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||
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||
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||
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||
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||
<li><a href="pmd_userdocs_configuring_rules.html">Configuring rules</a></li>
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||
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||
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||
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||
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||
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<li><a href="pmd_userdocs_best_practices.html">Best practices</a></li>
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
<li><a href="pmd_userdocs_suppressing_warnings.html">Suppressing warnings</a></li>
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
<li><a href="pmd_userdocs_incremental_analysis.html">Incremental analysis</a></li>
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||
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||
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||
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||
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||
|
||
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||
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||
|
||
|
||
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||
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||
<li><a href="pmd_userdocs_cli_reference.html">PMD CLI reference</a></li>
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||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_report_formats.html">PMD Report formats</a></li>
|
||
|
||
|
||
|
||
|
||
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||
|
||
|
||
|
||
|
||
|
||
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||
|
||
<li class="subfolders">
|
||
<a href="#">CPD reference</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_cpd.html">Copy-paste detection</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_cpd_report_formats.html">CPD Report formats</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Extending PMD</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_writing_rules_intro.html">Introduction to writing rules</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_your_first_rule.html">Your first rule</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_writing_xpath_rules.html">XPath rules</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_writing_java_rules.html">Java rules</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_designer_reference.html">Rule designer reference</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_defining_properties.html">Defining rule properties</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_metrics_howto.html">Using and defining code metrics</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_rule_guidelines.html">Rule guidelines</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_extending_testing.html">Testing your rules</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Tools / Integrations</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_maven.html">Maven PMD Plugin</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_gradle.html">Gradle</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_ant.html">Ant</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_java_api.html">PMD Java API</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools_ci.html">CI integrations</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_userdocs_tools.html">Other Tools / Integrations</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Rule Reference</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Apex Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_documentation.html">Documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_apex_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Ecmascript Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">HTML Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_html.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_html_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Java Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_documentation.html">Documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_multithreading.html">Multithreading</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_java_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Java Server Pages Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Maven POM Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_pom.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_pom_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Modelica Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_modelica.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_modelica_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">PLSQL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Salesforce VisualForce Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vf.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vf_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">VM Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_vm_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">XML Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">XSL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Language Specific Documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_jsp.html">JSP Support</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Java Support</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_java.html">Java Versions</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_java_metrics_index.html">Java Code Metrics</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_apex_metrics_index.html">Apex code metrics</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_plsql.html">PLSQL</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_visualforce.html">Visualforce</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_xml.html">XML and XML dialects</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_html.html">HTML</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_gherkin.html">Gherkin</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Developer Documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_development.html">Developer resources</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_building.html">Building PMD from source</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="https://github.com/pmd/pmd/blob/master/CONTRIBUTING.md" target="_blank">Contributing</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="active"><a href="pmd_devdocs_writing_documentation.html">Writing documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_roadmap.html">Roadmap</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_how_pmd_works.html">How PMD works</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_pmdtester.html">Pmdtester</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_rule_deprecation_policy.html">Rule Deprecation Policy</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Major contributions</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_rule_guidelines.html">Rule Guidelines</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_language.html">Adding a new language</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_cpd_language.html">Adding a new CPD language</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_metrics_framework.html">Adding metrics support to a language</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Experimental features</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_experimental_ast_dump.html">Creating (XML) dump of the AST</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Project documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Trivia about PMD</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_news.html">PMD in the press</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_products.html">Products & books related to PMD</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_similarprojects.html">Similar projects</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_meaning.html">What does 'PMD' mean?</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_faq.html">FAQ</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="license.html">License</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_credits.html">Credits</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_release_notes_old.html">Old release notes</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Project management</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_infrastructure.html">Infrastructure</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_releasing.html">Release process</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_merging_pull_requests.html">Merging pull requests</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_committers_main_landing_page.html">Main Landing page</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<!-- if you aren't using the accordion, uncomment this block:
|
||
<p class="external">
|
||
<a href="#" id="collapseAll">Collapse All</a> | <a href="#" id="expandAll">Expand All</a>
|
||
</p>
|
||
-->
|
||
</ul>
|
||
|
||
<!-- this highlights the active parent class in the navgoco sidebar. this is critical so that the parent expands when you're viewing a page. This must appear below the sidebar code above. Otherwise, if placed inside customscripts.js, the script runs before the sidebar code runs and the class never gets inserted.-->
|
||
<script>$("li.active").parents('li').toggleClass("active");</script>
|
||
|
||
</div>
|
||
|
||
|
||
|
||
<!-- Content Column -->
|
||
<div class="col-md-9" id="tg-sb-content">
|
||
<header>
|
||
<div class="row">
|
||
<div class="col-lg-12">
|
||
<a href="./" role="button"
|
||
><i class="fa fa-home fa-lg"></i
|
||
></a>
|
||
» Writing documentation
|
||
<a
|
||
target="_blank"
|
||
href="https://github.com/pmd/pmd/blob/master/docs/pages/pmd/devdocs/writing_documentation.md"
|
||
class="pull-right"
|
||
role="button"
|
||
><i class="fa fa-github fa-lg"></i> Edit on GitHub</a
|
||
>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<hr />
|
||
</header>
|
||
|
||
|
||
<div class="post-header">
|
||
<h1 class="post-title-main">Writing documentation</h1>
|
||
</div>
|
||
|
||
|
||
|
||
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/master/docs/pages/pmd/devdocs/writing_documentation.md">
|
||
|
||
|
||
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
|
||
|
||
<p>PMD’s documentation uses <a href="https://jekyllrb.com/">Jekyll</a> with
|
||
the <a href="http://idratherbewriting.com/documentation-theme-jekyll/index.html">I’d rather be writing Jekyll Theme</a>.</p>
|
||
|
||
<p>Here are some quick tips.</p>
|
||
|
||
<h2 id="format">Format</h2>
|
||
|
||
<p>The pages are in general in <a href="https://kramdown.gettalong.org/parser/gfm.html">Github Flavored Markdown</a>.</p>
|
||
|
||
<h2 id="structure">Structure</h2>
|
||
|
||
<p>The documentation sources can be found in two places based on how they are generated:</p>
|
||
<ul>
|
||
<li>the ones that are manually written (like the one you are reading);</li>
|
||
<li>and the ones that are generated automatically from the category files. All the rule documentation
|
||
pages are generated that way.</li>
|
||
</ul>
|
||
|
||
<h3 id="handwritten-documentation">Handwritten documentation</h3>
|
||
|
||
<p>All handwritten documentation is stored in the subfolders under <code class="language-plaintext highlighter-rouge">docs/pages</code>. The folder structure resembles the sidebar structure.
|
||
Since all pages use a simple <em>permalink</em>, in the rendered html pages, all pages are flattened in one directory.
|
||
This makes it easy to view the documentation also offline.</p>
|
||
|
||
<h3 id="rule-documentation">Rule documentation</h3>
|
||
|
||
<p>The categories for a language <code class="language-plaintext highlighter-rouge">%lang%</code> are located in
|
||
<code class="language-plaintext highlighter-rouge">pmd-%lang%/src/main/resources/category/%lang% </code>. So for Java the categories
|
||
can be found under <a href="https://github.com/pmd/pmd/tree/master/pmd-java/src/main/resources/category/java">pmd-java/src/main/resources/category/java</a>.
|
||
The XML category files in this directory are transformed during build into markdown pages
|
||
describing the rules they contain. These pages are placed under <code class="language-plaintext highlighter-rouge">docs/</code> like the handwritten
|
||
documentation, and are then rendered with Jekyll like the rest of them. The rule documentation
|
||
generator is the separate submodule <code class="language-plaintext highlighter-rouge">pmd-doc</code>.</p>
|
||
|
||
<p>Modifying the documentation of a rule should thus not be done on the markdown page,
|
||
but directly on the XML <code class="language-plaintext highlighter-rouge">rule</code> tag corresponding to the rule, in the relevant
|
||
category file.</p>
|
||
|
||
<p>The XML documentation of rules can contain GitHub flavoured markdown.
|
||
Just wrap the markdown inside CDATA section in the xml. CDATA sections preserve
|
||
all formatting inside the delimiters, and allow to write code samples without
|
||
escaping special xml characters. For example:</p>
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code><rule ...>
|
||
<description>
|
||
<![CDATA[
|
||
Full description, can contain markup
|
||
|
||
And paragraphs
|
||
]]>
|
||
</description>
|
||
...
|
||
</rule>
|
||
</code></pre></div></div>
|
||
|
||
<h2 id="custom-liquid-tags">Custom Liquid Tags</h2>
|
||
|
||
<p>We have some additional custom liquid tags that help in writing the documentation.</p>
|
||
|
||
<p>Here’s a short overview:</p>
|
||
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th style="text-align: left">Liquid</th>
|
||
<th style="text-align: left">Rendered as</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% rule "java/codestyle/LinguisticNaming" %}</code></td>
|
||
<td style="text-align: left"><a href="pmd_rules_java_codestyle.html#linguisticnaming"><code class="language-plaintext highlighter-rouge">LinguisticNaming</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc core::Rule %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/Rule.html#"><code>Rule</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc !q!core::Rule %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/Rule.html#"><code>net.sourceforge.pmd.Rule</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc core::Rule#setName(java.lang.String) %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/Rule.html#setName(java.lang.String)"><code>setName</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc !c!core::Rule#setName(java.lang.String) %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/Rule.html#setName(java.lang.String)"><code>Rule#setName</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc !a!core::Rule#setName(java.lang.String) %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/Rule.html#setName(java.lang.String)"><code>setName(String)</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc !ac!core::Rule#setName(java.lang.String) %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/Rule.html#setName(java.lang.String)"><code>Rule#setName(String)</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc core::properties.PropertyDescriptor %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/properties/PropertyDescriptor.html#"><code>PropertyDescriptor</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc_nspace :jast java::lang.java.ast %}{% jdoc jast::ASTAnyTypeDeclaration %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-java/6.50.0-SNAPSHOT/net/sourceforge/pmd/lang/java/ast/ASTAnyTypeDeclaration.html#"><code>ASTAnyTypeDeclaration</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc_nspace :jast java::lang.java.ast %}{% jdoc_package :jast %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-java/6.50.0-SNAPSHOT/net/sourceforge/pmd/lang/java/ast/package-summary.html#"><code>net.sourceforge.pmd.lang.java.ast</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc_nspace :PrD core::properties.PropertyDescriptor %}{% jdoc !ac!:PrD#uiOrder() %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.50.0-SNAPSHOT/net/sourceforge/pmd/properties/PropertyDescriptor.html#uiOrder()"><code>PropertyDescriptor#uiOrder()</code></a></td>
|
||
</tr>
|
||
<tr>
|
||
<td style="text-align: left"><code class="language-plaintext highlighter-rouge">{% jdoc_old core::Rule %}</code></td>
|
||
<td style="text-align: left"><a href="https://docs.pmd-code.org/apidocs/pmd-core/6.49.0/net/sourceforge/pmd/Rule.html#"><code>Rule</code></a></td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
|
||
<p>For the javadoc tags, the standard PMD maven modules are already defined as namespaces, e.g. <code class="language-plaintext highlighter-rouge">core</code>, <code class="language-plaintext highlighter-rouge">java</code>, <code class="language-plaintext highlighter-rouge">apex</code>, ….</p>
|
||
|
||
<p>For the implementation of these tags, see the <a href="https://github.com/pmd/pmd/tree/master/docs/_plugins">_plugins</a> folder.</p>
|
||
|
||
<h2 id="building">Building</h2>
|
||
|
||
<p>There are two ways, to execute jekyll:</p>
|
||
|
||
<ol>
|
||
<li>
|
||
<p>Using <a href="http://bundler.io/">bundler</a>. This will install all the needed ruby packages locally and execute jekyll:</p>
|
||
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># this is required only once, to download and install the dependencies
|
||
bundle install
|
||
# this builds the documentation under _site
|
||
bundle exec jekyll build
|
||
# this runs a local webserver as http://localhost:4005
|
||
bundle exec jekyll serve
|
||
</code></pre></div> </div>
|
||
</li>
|
||
<li>
|
||
<p>Using <a href="https://www.docker.com/">docker</a>. This will create a local docker image, into which all needed ruby
|
||
packages and jekyll is installed.</p>
|
||
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># this is required only once to create a local docker image named "pmd-doc"
|
||
docker build --no-cache -t pmd-doc .
|
||
# this builds the documentation under _site
|
||
docker run --rm=true -v "$PWD:/src" pmd-doc build -H 0.0.0.0
|
||
# this runs a local webserver as http://localhost:4005
|
||
docker run --rm=true -v "$PWD:/src" -p 4005:4005 pmd-doc serve -H 0.0.0.0
|
||
</code></pre></div> </div>
|
||
</li>
|
||
</ol>
|
||
|
||
<p>The built site is stored locally in the (git ignored) directory <code class="language-plaintext highlighter-rouge">_site</code>. You can
|
||
point your browser to <code class="language-plaintext highlighter-rouge">_site/index.html</code> to see the pmd documentation.</p>
|
||
|
||
<p>Alternatively, you can start the local webserver, that will serve the documentation.
|
||
Just go to http://localhost:4005.
|
||
If a page is modified, the documentation will automatically be rendered again and
|
||
all you need to do, is refreshing the page in your browser.</p>
|
||
|
||
<p>See also the script <a href="https://gist.github.com/oowekyala/ee6f8801138861072c59ce683bdf737b">pmd-jekyll.sh</a>.
|
||
It starts the jekyll server in the background and doesn’t block the current shell.</p>
|
||
|
||
<h2 id="the-sidebar">The sidebar</h2>
|
||
|
||
<p>The sidebar is stored as a YAML document under <code class="language-plaintext highlighter-rouge">_data/sidebars/pmd_sidebar.yml</code>.</p>
|
||
|
||
<p>Make sure to add an entry there, whenever you create a new page.</p>
|
||
|
||
<h2 id="the-frontmatter">The frontmatter</h2>
|
||
|
||
<p>Each page in jekyll begins with a YAML section at the beginning. This section
|
||
is separated by 3 dashes (<code class="language-plaintext highlighter-rouge">---</code>). Example:</p>
|
||
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>---
|
||
title: Writing Documentation
|
||
last_update: August 2017
|
||
permalink: pmd_devdocs_writing_documentation.html
|
||
---
|
||
|
||
Some Text
|
||
|
||
# Some header
|
||
</code></pre></div></div>
|
||
|
||
<p>There are a couple of possible fields. Most important and always
|
||
required are <strong>title</strong> and <strong>permalink</strong>.</p>
|
||
|
||
<p>By default, a page <strong>toc</strong> (table of contents) is automatically generated.
|
||
You can prevent this with “toc: false”.</p>
|
||
|
||
<p>You can add <strong>keywords</strong>, that will be used for the on-site search: “keywords: documentation, jekyll, markdown”</p>
|
||
|
||
<p>It’s useful to maintain a <strong>last_update</strong> field. This will be added at the bottom of the
|
||
page.</p>
|
||
|
||
<p>A <strong>summary</strong> can also be provided. It will be added in a box before the content.</p>
|
||
|
||
<p>For a more exhaustive list, see <a href="http://idratherbewriting.com/documentation-theme-jekyll/mydoc_pages.html#frontmatter">Pages - Frontmatter</a>.</p>
|
||
|
||
<h2 id="alerts-and-callouts">Alerts and Callouts</h2>
|
||
|
||
<p>See <a href="http://idratherbewriting.com/documentation-theme-jekyll/mydoc_alerts.html">Alerts</a>.</p>
|
||
|
||
<p>For example, a info-box can be created like this:</p>
|
||
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>{% include note.html content="This is a note." %}
|
||
</code></pre></div></div>
|
||
|
||
<p>It renders as:</p>
|
||
|
||
<div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> This is a note.</div>
|
||
|
||
<p>Other available types are:</p>
|
||
|
||
<ul>
|
||
<li>note.html</li>
|
||
<li>tip.html</li>
|
||
<li>warning.html</li>
|
||
<li>important.html</li>
|
||
</ul>
|
||
|
||
<p>A callout is created like this:</p>
|
||
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>{% include callout.html content="This is a callout of type default.<br/><br/>There are the following types available: danger, default, primary, success, info, and warning." type="default" %}
|
||
</code></pre></div></div>
|
||
|
||
<p>It renders as:</p>
|
||
|
||
<div class="bs-callout bs-callout-default">This is a callout of type default.<br /><br />There are the following types available: danger, default, primary, success, info, and warning.</div>
|
||
|
||
<h2 id="code-samples-with-syntax-highlighting">Code samples with syntax highlighting</h2>
|
||
|
||
<p>This is as easy as:</p>
|
||
|
||
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>``` java
|
||
public class Foo {
|
||
public void bar() { System.out.println("x"); }
|
||
}
|
||
```
|
||
</code></pre></div></div>
|
||
|
||
<p>This looks as follows:</p>
|
||
|
||
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Foo</span> <span class="o">{</span>
|
||
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">bar</span><span class="o">()</span> <span class="o">{</span> <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"x"</span><span class="o">);</span> <span class="o">}</span>
|
||
<span class="o">}</span>
|
||
</code></pre></div></div>
|
||
|
||
<h2 id="checking-for-dead-links">Checking for dead links</h2>
|
||
|
||
<p><code class="language-plaintext highlighter-rouge">mvn verify -pl pmd-doc</code>. This only checks links within the site. HTTP links can be checked
|
||
by specifying <code class="language-plaintext highlighter-rouge">-Dpmd.doc.checkExternalLinks=true</code> on the command line.</p>
|
||
|
||
|
||
<div class="tags">
|
||
|
||
<b>Tags: </b>
|
||
|
||
|
||
|
||
<a href="tag_devdocs.html" class="btn btn-default navbar-btn cursorNorm" role="button">devdocs</a>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
<footer>
|
||
|
||
<hr />
|
||
<div>
|
||
This documentation is written in markdown. <br />
|
||
If there is something missing or can be improved, edit this page on
|
||
github and create a PR:
|
||
<a
|
||
target="_blank"
|
||
href="https://github.com/pmd/pmd/blob/master/docs/pages/pmd/devdocs/writing_documentation.md"
|
||
role="button"
|
||
><i class="fa fa-github fa-lg"></i> Edit on GitHub</a
|
||
>
|
||
</div>
|
||
|
||
<hr />
|
||
<div class="row">
|
||
<div class="col-lg-12 footer">
|
||
©2022 PMD Open Source Project. All rights
|
||
reserved. <br />
|
||
Site last generated: Sep 11, 2022 <br />
|
||
<p>
|
||
<img src="images/pmd-logo-small.png" alt="Company
|
||
logo"/>
|
||
</p>
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- /.row -->
|
||
</div>
|
||
<!-- /.container -->
|
||
</div>
|
||
|
||
|
||
<!-- Sticky TOC column -->
|
||
<div class="toc-col">
|
||
<div id="toc"></div>
|
||
</div>
|
||
|
||
<!-- /.toc-container-wrapper -->
|
||
</div>
|
||
</div>
|
||
</body>
|
||
|
||
</html>
|