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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="meta-model, code, elements, ast, meta, model">
<title>Code elements | Spoon</title>
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<div class="post-header">
<h1 class="post-title-main">Code elements</h1>
</div>
<div class="post-content">
<p>Figure at the end of this page shows the meta model for Java executable code.
There are two main kinds of code elements.
First, statements <code class="language-plaintext highlighter-rouge">CtStatement</code> (<a href="http://spoon.gforge.inria.fr/mvnsites/spoon-core/apidocs/spoon/reflect/code/CtStatement.html">javadoc</a>)
are untyped top-level instructions that can be used directly in a block of code.
Second, expressions <code class="language-plaintext highlighter-rouge">CtExpression</code> (<a href="http://spoon.gforge.inria.fr/mvnsites/spoon-core/apidocs/spoon/reflect/code/CtExpression.html">javadoc</a>)
are used inside the statements. For instance, a <code class="language-plaintext highlighter-rouge">CtLoop</code> (<a href="http://spoon.gforge.inria.fr/mvnsites/spoon-core/apidocs/spoon/reflect/code/CtLoop.html">javadoc</a>)
(which is a statement) points to <code class="language-plaintext highlighter-rouge">CtExpression</code> which expresses its boolean condition.</p>
<p>Some code elements such as invocations and assignments are both statements
and expressions (multiple inheritance links). Concretely, this is translated as an
interface <code class="language-plaintext highlighter-rouge">CtInvocation</code> (<a href="http://spoon.gforge.inria.fr/mvnsites/spoon-core/apidocs/spoon/reflect/code/CtInvocation.html">javadoc</a>)
inheriting from both interfaces <code class="language-plaintext highlighter-rouge">CtStatement</code> and <code class="language-plaintext highlighter-rouge">CtExpression</code>.
The generic type of <code class="language-plaintext highlighter-rouge">CtExpression</code> is used to add static type-checking when transforming programs.</p>
<p><img src="/images/code-elements.png" alt="Code part of the Spoon Java 8 metamodel" /></p>
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