/usr/share/javascript/prettify/lang-lua.js is in libjs-prettify 2013.03.04+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | PR.registerLangHandler(PR.createSimpleLexer([["pln",/^[\t\n\r \xA0]+/,null,"\t\n\r \u00a0"],["str",/^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\]|\\[\s\S])*(?:\'|$))/,null,"\"'"]],[["com",/^--(?:\[(=*)\[[\s\S]*?(?:\]\1\]|$)|[^\r\n]*)/],["str",/^\[(=*)\[[\s\S]*?(?:\]\1\]|$)/],["kwd",/^(?:and|break|do|else|elseif|end|false|for|function|if|in|local|nil|not|or|repeat|return|then|true|until|while)\b/,null],["lit",/^[+-]?(?:0x[\da-f]+|(?:(?:\.\d+|\d+(?:\.\d*)?)(?:e[+\-]?\d+)?))/i],
["pln",/^[a-z_]\w*/i],["pun",/^[^\w\t\n\r \xA0][^\w\t\n\r \xA0\"\'\-\+=]*/]]),["lua"]);
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