This file is indexed.

/usr/share/xslthl/highlighters/lua-hl.xml is in libxslthl-java 2.1.3-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

Syntax highlighting definition for Lua 5.1 and 5.2

xslthl - XSLT Syntax Highlighting
http://sourceforge.net/projects/xslthl/
Copyright (C) 2012 Patrick Rapin

This software is provided 'as-is', without any express or implied
warranty.  In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

 If you want to send an e-mail to Patrick Rapin, please execute the 
 following decrypting script in Lua 5.1 or 5.2:
    print(('oc mia.l@kmgrtci.naparip'):gsub('(..)(..)','%2%1'):reverse())
-->

<highlighters>
  <highlighter type="keywords">
    <keyword>and</keyword>
    <keyword>break</keyword>
    <keyword>do</keyword>
    <keyword>else</keyword>
    <keyword>elseif</keyword>
    <keyword>end</keyword>
    <keyword>false</keyword>
    <keyword>for</keyword>
    <keyword>function</keyword>
    <keyword>goto</keyword>
    <keyword>if</keyword>
    <keyword>in</keyword>
    <keyword>local</keyword>
    <keyword>nil</keyword>
    <keyword>not</keyword>
    <keyword>or</keyword>
    <keyword>repeat</keyword>
    <keyword>return</keyword>
    <keyword>then</keyword>
    <keyword>true</keyword>
    <keyword>until</keyword>
    <keyword>while</keyword>
  </highlighter>
  
  <!-- Multiline comments can have any number of equal signs 
    between brackets. Let's support up to 4 -->
  <highlighter type="multiline-comment">
    <start>--[[</start>
    <end>]]</end>
  </highlighter>
  <highlighter type="multiline-comment">
    <start>--[=[</start>
    <end>]=]</end>
  </highlighter>
  <highlighter type="multiline-comment">
    <start>--[==[</start>
    <end>]==]</end>
  </highlighter>
  <highlighter type="multiline-comment">
    <start>--[===[</start>
    <end>]===]</end>
  </highlighter>
  <highlighter type="multiline-comment">
    <start>--[====[</start>
    <end>]====]</end>
  </highlighter>

  <highlighter type="oneline-comment">
    --
  </highlighter>
  
  <highlighter type="string">
    <string>"</string>
    <endString>"</endString>
    <escape>\</escape>
    <spanNewLines/>
  </highlighter>
  
  <highlighter type="string">
    <string>'</string>
    <endString>'</endString>
    <escape>\</escape>
    <spanNewLines/>
  </highlighter>

  <!-- Long strings can also have any number of equal signs. -->
  <highlighter type="string">
    <string>[[</string>
    <endString>]]</endString>
    <spanNewLines/>
  </highlighter>
  <highlighter type="string">
    <string>[=[</string>
    <endString>]=]</endString>
    <spanNewLines/>
  </highlighter>
  <highlighter type="string">
    <string>[==[</string>
    <endString>]==]</endString>
    <spanNewLines/>
  </highlighter>
  <highlighter type="string">
    <string>[===[</string>
    <endString>]===]</endString>
    <spanNewLines/>
  </highlighter>
  <highlighter type="string">
    <string>[====[</string>
    <endString>]====]</endString>
    <spanNewLines/>
  </highlighter>

  <highlighter type="number">
    <point>.</point>
    <pointStarts />
    <exponent>e</exponent>
    <ignoreCase />
  </highlighter>

  <highlighter type="hexnumber">
    <prefix>0x</prefix>
    <point>.</point>
    <pointStarts />
    <exponent>p</exponent>
    <ignoreCase />
  </highlighter>
  
</highlighters>