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<a name="Control-Flow"></a>
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Next: <a href="Tests-and-Conditions.html#Tests-and-Conditions" accesskey="n" rel="next">Tests and Conditions</a>, Previous: <a href="Actions-Described.html#Actions-Described" accesskey="p" rel="prev">Actions Described</a>, Up: <a href="Syntax.html#Syntax" accesskey="u" rel="up">Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Control-Flow-1"></a>
<h4 class="subsection">4.2.3 Control Flow</h4>
<a name="index-if_002c-sieve"></a>
<p>The only control flow statement Sieve has is <code>if</code> statement. In its
simplest form it is:
</p>
<div class="smallexample">
<pre class="smallexample">if <code>condition</code> { … }
</pre></div>
<p>The effect of this statement is that the sequence of actions between the
curly braces is executed only if the <code>condition</code> evaluates to
<code>true</code>.
</p>
<p>A more elaborate form of this statement allows to execute two
different sets of actions depending on whether the condition is
true or not:
</p>
<div class="smallexample">
<pre class="smallexample">if <code>condition</code> { … } else { … }
</pre></div>
<p>The most advanced form of the “if” statement allows to select an
action depending on what condition from the set of conditions is met.
</p>
<div class="smallexample">
<pre class="smallexample">if <code>cond1</code> { … } elsif <code>cond2</code> { … } else { … }
</pre></div>
<p>There may be any number of “elsif” branches in an “if”
statement. However it may have at most one “else” branch.
Notes for C programmers:
</p>
<ol>
<li> The braces surrounding each branch of an “if” statement are
required.
</li><li> The “else if” construct is disallowed. Use “elsif” keyword
instead.
</li></ol>
<p>Here’s an example of “if” statement:
</p>
<div class="smallexample">
<pre class="smallexample">if header :contains "from" "coyote"
{
discard;
}
elsif header :contains ["subject"] ["$$$"]
{
discard;
}
else
{
fileinto "INBOX";
}
</pre></div>
<p>The following section describes in detail conditions used in “if”
statements.
</p>
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