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<h1>luaharfbuzz</h1>




<h2>Examples</h2>
<ul class="nowrap">
  <li><a href="../examples/core_types.lua.html">core_types.lua</a></li>
  <li><strong>custom_callbacks.lua</strong></li>
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    <h2>custom_callbacks.lua</h2>
<pre>
<span class="comment">-- Switch off some callbacks
</span>callback.register(<span class="string">"hyphenate"</span>, <span class="keyword">false</span>)
callback.register(<span class="string">"ligaturing"</span>, <span class="keyword">false</span>)
callback.register(<span class="string">"kerning"</span>, <span class="keyword">false</span>)

<span class="comment">-- Add debug statements to some callbacks
</span>callback.register(<span class="string">"post_linebreak_filter"</span>, <span class="keyword">function</span>()
  texio.write_nl(<span class="string">"POST_LINEBREAK"</span>)
  <span class="keyword">return</span> <span class="keyword">true</span>
<span class="keyword">end</span>)

callback.register(<span class="string">"hpack_filter"</span>, <span class="keyword">function</span>()
  texio.write_nl(<span class="string">"HPACK"</span>)
  <span class="keyword">return</span> <span class="keyword">true</span>
<span class="keyword">end</span>)

callback.register(<span class="string">"vpack_filter"</span>, <span class="keyword">function</span>()
  texio.write_nl(<span class="string">"VPACK"</span>)
  <span class="keyword">return</span> <span class="keyword">true</span>
<span class="keyword">end</span>)

callback.register(<span class="string">"buildpage_filter"</span>, <span class="keyword">function</span>(extrainfo)
  texio.write_nl(<span class="string">"BUILDPAGE_FILTER "</span>..extrainfo)
<span class="keyword">end</span>)</pre>


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