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<h3 class="section" id="Traps-1">5.28 Traps</h3>
<a class="index-entry-id" id="index-traps"></a>
<p><em class="dfn">Traps</em> are locations in the output or conditions on the input that,
when reached or fulfilled, call a specified macro. These traps can
occur at a given location on the page, at a given location in the
current diversion (together, these are known as <i class="slanted">vertical
position traps</i>), at a blank line, at a line with leading space
characters, after a quantity of input lines, or at the end of input.
Macros called by traps are passed no arguments.
<a class="index-entry-id" id="index-planting-a-trap"></a>
<a class="index-entry-id" id="index-trap_002c-planting"></a>
Setting a trap is also called <em class="dfn">planting</em> one.
<a class="index-entry-id" id="index-trap_002c-springing"></a>
<a class="index-entry-id" id="index-springing-a-trap"></a>
It is said that a trap is <em class="dfn">sprung</em> if its condition is fulfilled.
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<ul class="mini-toc">
<li><a href="Vertical-Position-Traps.html" accesskey="1">Vertical Position Traps</a></li>
<li><a href="Input-Line-Traps.html" accesskey="2">Input Line Traps</a></li>
<li><a href="Blank-Line-Traps.html" accesskey="3">Blank Line Traps</a></li>
<li><a href="Leading-Space-Traps.html" accesskey="4">Leading Space Traps</a></li>
<li><a href="End_002dof_002dinput-Traps.html" accesskey="5">End-of-input Traps</a></li>
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