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<!DOCTYPE html>
<html lang="en">
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="keywords" content="javadocjavadoc-parsing, javadoc, javadoc-parsing, comments, spoon">
<title>Javadoc parsing | Spoon</title>
<link rel="stylesheet" type="text/css" href="css/syntax.css">
<link rel="stylesheet" type="text/css" href="css/font-awesome.min.css">
<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="css/modern-business.css">
<link rel="stylesheet" type="text/css" href="css/lavish-bootstrap.css">
<link rel="canonical" href="/spoon_javadoc.html">
<link rel="stylesheet" type="text/css" href="css/customstyles.css">
<link rel="stylesheet" type="text/css" href="css/theme-mauve.css">
<link rel="canonical" href="/spoon_javadoc.html">
<link rel="alternate" type="application/rss+xml" title="" href="feed.xml" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js"></script>
<script src="js/jquery.navgoco.min.js"></script>
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<![endif]-->
<script>
$(function () {
$('[data-toggle="tooltip"]').tooltip()
})
</script>
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container topnavlinks">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="fa fa-home fa-lg navbar-brand" href="index.html"> <span class="projectTitle"> Spoon</span></a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<!-- entries without drop-downs appear here -->
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<li><a href="papers.html">Papers</a></li>
<li><a href="ecosystem.html">Ecosystem</a></li>
<li><a href="about.html">About</a></li>
<li><a href="https://ci.inria.fr/sos/" target="_blank">Jenkins</a></li>
<li><a href="https://github.com/INRIA/spoon" target="_blank">Github</a></li>
<!-- entries with drop-downs appear here -->
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<li class="dropdown">
</div>
<!-- /.container -->
</nav>
<!-- Page Content -->
<div class="container">
<div class="col-lg-12"> </div>
<!-- Content Row -->
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<script>
$(document).ready(function() {
// Initialize navgoco with default options
$("#mysidebar").navgoco({
caretHtml: '',
accordion: true,
openClass: 'active', // open
save: false, // leave false or nav highlighting doesn't work right
cookie: {
name: 'navgoco',
expires: false,
path: '/'
},
slide: {
duration: 400,
easing: 'swing'
}
});
$("#collapseAll").click(function(e) {
e.preventDefault();
$("#mysidebar").navgoco('toggle', false);
});
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</li>
<li><a href="processor.html">Processor for elements</a></li>
</li>
<li><a href="/mvnsites/spoon-core/apidocs" target="_blank">Javadoc</a></li>
</li>
<li class="active"><a href="spoon_javadoc.html">Javadoc Analysis</a></li>
</li>
<li><a href="faq.html">FAQ</a></li>
</li>
</ul>
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<li><a href="#">Querying source code elements</a>
<ul>
<li><a href="filter.html">AST Traversing</a></li>
</li>
<li><a href="path.html">AST Paths and Roles</a></li>
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</ul>
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</ul>
</div>
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<script>$("li.active").parents('li').toggleClass("active");</script>
<!-- Content Column -->
<div class="col-md-9">
<div class="post-header">
<h1 class="post-title-main">Javadoc parsing</h1>
</div>
<div class="post-content">
<p>The spoon-javadoc submodule provides a parser for javadoc comments, producing a
structured syntax tree representing the comment. Each tag is parsed and
tokenized according to the rules in the javadoc specification. Additionally,
references in e.g. <code class="language-plaintext highlighter-rouge">@link</code> or <code class="language-plaintext highlighter-rouge">@see</code> tags are resolved to <code class="language-plaintext highlighter-rouge">CtReference</code>s,
allowing you to easily analyze them.</p>
<p>A visitor infrastructure is also provided, which eases analyzing comments or
converting them into your own format.</p>
<h3 id="installation">Installation</h3>
<p>To use spoon-javadoc, add the following dependency to your <code class="language-plaintext highlighter-rouge">pom.xml</code>:</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><dependency></span>
<span class="nt"><groupId></span>fr.inria.gforge.spoon<span class="nt"></groupId></span>
<span class="nt"><artifactId></span>spoon-javadoc<span class="nt"></artifactId></span>
<span class="nt"><version></span>$currentVersion<span class="nt"></version></span>
<span class="nt"></dependency></span>
</code></pre></div></div>
<h3 id="basic-usage">Basic usage</h3>
<p>To get started you get the raw javadoc string (including <code class="language-plaintext highlighter-rouge">/**</code> and <code class="language-plaintext highlighter-rouge">*/</code>) and
pass it to a newly created <code class="language-plaintext highlighter-rouge">JavadocParser</code>.
You then call <code class="language-plaintext highlighter-rouge">parse</code> and get back a list of elements, corresponding to text,
inline tags or block tags.
Using a <code class="language-plaintext highlighter-rouge">JavadocVisitor</code> you can then visit each of them and drill down a bit.</p>
<p>In the following example, javadoc is parsed and then printed out again – but
this time with some ANSI color highlighting applied. Note that references are
pretty-printed according to <code class="language-plaintext highlighter-rouge">CtReference#toString()</code>.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="nf">example</span><span class="o">()</span> <span class="o">{</span>
<span class="nc">String</span> <span class="n">javadoc</span> <span class="o">=</span> <span class="s">"/**\n"</span> <span class="o">+</span>
<span class="s">" * Hello world, this is a description.\n"</span> <span class="o">+</span>
<span class="s">" * How are you doing? I am just fine :)\n"</span> <span class="o">+</span>
<span class="s">" * This is an inline link {@link String} and one with a {@link String label}\n"</span> <span class="o">+</span>
<span class="s">" * and a {@link String#CASE_INSENSITIVE_ORDER field} and {@link String#replace(char, char) with a space}.\n"</span> <span class="o">+</span>
<span class="s">" * {@link java.lang.annotation.Target @Target} chained to @Target.\n"</span> <span class="o">+</span>
<span class="s">" * <p>\n"</span> <span class="o">+</span>
<span class="s">" * We can also write <em>very HTML</em> {@code code}.\n"</span> <span class="o">+</span>
<span class="s">" * And an index: {@index \"Hello world\" With a phrase} or {@index without Without a phrase}.\n"</span> <span class="o">+</span>
<span class="s">" * {@snippet lang = java id = \"example me\" foo = 'bar':\n"</span> <span class="o">+</span>
<span class="s">" * public void HelloWorld(){ //@start region = \"foo\"\n"</span> <span class="o">+</span>
<span class="s">" * System.out.println(\"Hello World!\"); // @highlight substring=\"println\"\n"</span> <span class="o">+</span>
<span class="s">" * int a = 10; // @start foo=bar :\n"</span> <span class="o">+</span>
<span class="s">" * int a = 10; // @end\n"</span> <span class="o">+</span>
<span class="s">" * } // @end region=foo\n"</span> <span class="o">+</span>
<span class="s">" *}\n"</span> <span class="o">+</span>
<span class="s">" * <h2><a id=\"resolution\"></a>{@index \"Module Resolution\"}</h2>\n"</span> <span class="o">+</span>
<span class="s">" *\n"</span> <span class="o">+</span>
<span class="s">" * @param args some argument\n"</span> <span class="o">+</span>
<span class="s">" * @author a poor {@literal man}\n"</span> <span class="o">+</span>
<span class="s">" * hello world\n"</span> <span class="o">+</span>
<span class="s">" * @see String#contains(CharSequence) with a label\n"</span> <span class="o">+</span>
<span class="s">" * @see String#replace(char, char)\n"</span> <span class="o">+</span>
<span class="s">" */\n"</span><span class="o">;</span>
<span class="nc">List</span><span class="o"><</span><span class="nc">JavadocElement</span><span class="o">></span> <span class="n">elements</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">JavadocParser</span><span class="o">(</span>
<span class="c1">// Raw comment string including "/*" and "**/"</span>
<span class="c1">// You can get this using CtComment#getRawContent from a spoon element.</span>
<span class="n">javadoc</span><span class="o">,</span>
<span class="c1">// The reference element so resolving of links works correctly.</span>
<span class="c1">// Javadoc comments can use "#foo" to refer to fields/methods</span>
<span class="c1">// in the current class.</span>
<span class="k">new</span> <span class="nf">Launcher</span><span class="o">().</span><span class="na">getFactory</span><span class="o">().</span><span class="na">Type</span><span class="o">().</span><span class="na">OBJECT</span><span class="o">.</span><span class="na">getTypeDeclaration</span><span class="o">()</span>
<span class="o">).</span><span class="na">parse</span><span class="o">();</span>
<span class="k">for</span> <span class="o">(</span><span class="nc">JavadocElement</span> <span class="n">element</span> <span class="o">:</span> <span class="n">elements</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">print</span><span class="o">(</span><span class="n">element</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="k">new</span> <span class="nc">ExampleVisitor</span><span class="o">()));</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="kd">private</span> <span class="kd">static</span> <span class="kd">class</span> <span class="nc">ExampleVisitor</span> <span class="kd">implements</span> <span class="nc">JavadocVisitor</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">defaultValue</span><span class="o">()</span> <span class="o">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nf">RuntimeException</span><span class="o">(</span><span class="s">"Visit method not implemented"</span><span class="o">);</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">visitInlineTag</span><span class="o">(</span><span class="nc">JavadocInlineTag</span> <span class="n">tag</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">String</span> <span class="n">result</span> <span class="o">=</span> <span class="s">"{@\033[36m"</span> <span class="o">+</span> <span class="n">tag</span><span class="o">.</span><span class="na">getTagType</span><span class="o">().</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">"\033[0m"</span><span class="o">;</span>
<span class="k">for</span> <span class="o">(</span><span class="nc">JavadocElement</span> <span class="n">element</span> <span class="o">:</span> <span class="n">tag</span><span class="o">.</span><span class="na">getElements</span><span class="o">())</span> <span class="o">{</span>
<span class="n">result</span> <span class="o">+=</span> <span class="s">" "</span> <span class="o">+</span> <span class="n">element</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="k">this</span><span class="o">);</span>
<span class="o">}</span>
<span class="n">result</span> <span class="o">+=</span> <span class="s">"}"</span><span class="o">;</span>
<span class="k">return</span> <span class="n">result</span><span class="o">;</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">visitBlockTag</span><span class="o">(</span><span class="nc">JavadocBlockTag</span> <span class="n">tag</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">String</span> <span class="n">result</span> <span class="o">=</span> <span class="s">"@\033[36m"</span> <span class="o">+</span> <span class="n">tag</span><span class="o">.</span><span class="na">getTagType</span><span class="o">().</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">"\033[0m "</span><span class="o">;</span>
<span class="k">for</span> <span class="o">(</span><span class="nc">JavadocElement</span> <span class="n">element</span> <span class="o">:</span> <span class="n">tag</span><span class="o">.</span><span class="na">getElements</span><span class="o">())</span> <span class="o">{</span>
<span class="n">result</span> <span class="o">+=</span> <span class="n">element</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="k">this</span><span class="o">);</span>
<span class="o">}</span>
<span class="n">result</span> <span class="o">+=</span> <span class="s">"\n"</span><span class="o">;</span>
<span class="k">return</span> <span class="n">result</span><span class="o">;</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">visitText</span><span class="o">(</span><span class="nc">JavadocText</span> <span class="n">text</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">text</span><span class="o">.</span><span class="na">getText</span><span class="o">();</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">visitReference</span><span class="o">(</span><span class="nc">JavadocReference</span> <span class="n">reference</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s">"\033[31m"</span> <span class="o">+</span> <span class="n">reference</span><span class="o">.</span><span class="na">getReference</span><span class="o">()</span> <span class="o">+</span> <span class="s">"\033[0m"</span><span class="o">;</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">visitSnippet</span><span class="o">(</span><span class="nc">JavadocSnippetTag</span> <span class="n">snippet</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">String</span> <span class="n">result</span> <span class="o">=</span> <span class="s">"{@\033[36m"</span> <span class="o">+</span> <span class="n">snippet</span><span class="o">.</span><span class="na">getTagType</span><span class="o">().</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">"\033[0m "</span><span class="o">;</span>
<span class="n">result</span> <span class="o">+=</span> <span class="n">snippet</span><span class="o">.</span><span class="na">getAttributes</span><span class="o">()</span>
<span class="o">.</span><span class="na">entrySet</span><span class="o">()</span>
<span class="o">.</span><span class="na">stream</span><span class="o">()</span>
<span class="o">.</span><span class="na">sorted</span><span class="o">(</span><span class="nc">Map</span><span class="o">.</span><span class="na">Entry</span><span class="o">.</span><span class="na">comparingByKey</span><span class="o">())</span>
<span class="o">.</span><span class="na">map</span><span class="o">(</span><span class="n">entry</span> <span class="o">-></span> <span class="n">entry</span><span class="o">.</span><span class="na">getKey</span><span class="o">()</span> <span class="o">+</span> <span class="s">"='"</span> <span class="o">+</span> <span class="n">entry</span><span class="o">.</span><span class="na">getValue</span><span class="o">()</span> <span class="o">+</span> <span class="s">"'"</span><span class="o">)</span>
<span class="o">.</span><span class="na">collect</span><span class="o">(</span><span class="nc">Collectors</span><span class="o">.</span><span class="na">joining</span><span class="o">(</span><span class="s">" "</span><span class="o">));</span>
<span class="n">result</span> <span class="o">+=</span> <span class="s">" : "</span><span class="o">;</span>
<span class="k">for</span> <span class="o">(</span><span class="nc">JavadocElement</span> <span class="n">element</span> <span class="o">:</span> <span class="n">snippet</span><span class="o">.</span><span class="na">getElements</span><span class="o">())</span> <span class="o">{</span>
<span class="n">result</span> <span class="o">+=</span> <span class="n">element</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="k">this</span><span class="o">);</span>
<span class="o">}</span>
<span class="n">result</span> <span class="o">+=</span> <span class="s">"}\n"</span><span class="o">;</span>
<span class="k">return</span> <span class="n">result</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<p><br />
This will print a version with a bit more colours:
<img src="/images/spoon_javadoc_ansi_print.png" alt="ANSI colored javadoc" /></p>
<h3 id="snippets">Snippets</h3>
<p>Spoon-javadoc provides the <code class="language-plaintext highlighter-rouge">JavadocSnippetBody</code> class to help parse javadoc
snippets:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nc">JavadocSnippetBody</span> <span class="n">body</span> <span class="o">=</span> <span class="nc">JavadocSnippetBody</span><span class="o">.</span><span class="na">fromString</span><span class="o">(</span>
<span class="s">"class Foo { // @start region=\"foo\"\n"</span> <span class="o">+</span>
<span class="s">" int p0 = 0; // @start region=\"bar\"\n"</span> <span class="o">+</span>
<span class="s">" int p1 = 1;\n"</span> <span class="o">+</span>
<span class="s">" int p2 = 2; // @end\n"</span> <span class="o">+</span>
<span class="s">" int p3 = 3; // @end\n"</span> <span class="o">+</span>
<span class="s">"}\n"</span>
<span class="o">);</span>
<span class="n">body</span><span class="o">.</span><span class="na">getLines</span><span class="o">();</span> <span class="c1">// returns all lines of the original snippet</span>
<span class="n">body</span><span class="o">.</span><span class="na">getRegions</span><span class="o">();</span> <span class="c1">// returns all start/highlight/link regions</span>
<span class="n">body</span><span class="o">.</span><span class="na">getActiveRegionsAtLine</span><span class="o">(</span><span class="mi">0</span><span class="o">);</span> <span class="c1">// returns all regions active in the given line</span>
</code></pre></div></div>
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