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<h1>ZPT-JS reference - Boolean expressions</h1>
<ul>
<li><a href="#syntax">Syntax</a>.</li>
<li><a href="#description">Description</a>.</li>
<li><a href="#differences">Differences with ZPT</a>.</li>
<li><a href="#examples">Examples</a>.</li>
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<h2 data-attributes="id 'syntax'">Syntax</h2>
<p><em>or</em> and <em>and</em> syntax:</p>
<pre class="syntax">
or_and_expressions ::= ( 'or:' | 'and:' ) expression expression [ expression ]*
</pre>
<p><em>cond</em> syntax:</p>
<pre class="syntax">
cond_expressions ::= 'cond:' expression expression expression
</pre>
<p><em>not</em> syntax:</p>
<pre class="syntax">
not_expressions ::= 'not:' expression
</pre>
<h2 data-attributes="id 'description'">Description</h2>
<p>
The list of available <em>boolean expressions</em> is:
</p>
<ul>
<li><code>or: x y</code> -> boolean or of expressions x and y</li>
<li><code>and: x y</code> -> boolean and of expressions x and y</li>
<li><code>cond: x y z</code> -> evaluate as boolean x; if true return y, otherwise return z</li>
<li><code>not: x</code> -> if x then false else true</li>
</ul>
<p>
All operators uses lazy evaluation. <em>or</em> and <em>and</em> expressions support 2 or more operators. <em>cond</em> expressions only support 3. <em>not</em> expressions only support 1. Parenthesis can be used.
</p>
<h2 data-attributes="id 'differences'">Differences with ZPT</h2>
<p>
This expressions does not exist in ZPT.
</p>
<h2 data-attributes="id 'examples'">Examples</h2>
<p>
Some examples in <em>data-condition</em> and <em>data-content</em>:
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<pre class="brush: html">
<p data-condition="or: isFridayNight isSaturday isSunday">
Yeah!
</p>
<p data-condition="and: ( exists:pets()/dog() ) ( not:pets()/dog()/badDog() )">
Good dog!
</p>
<p data-content="cond: partyToday 'Yeah!' 'Oh!'">
Party?
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