This example is a LuaTeX-based plain TeX project which implements a LuaTeX callback function to show the components of a typeset paragraph. It is designed to accompany a blog post and, for simplicity, it is not a full-blown “parser”—for example, it is not recursive and ignores a number of node types. However, it offers a useful starting point for anyone wishing to explore callbacks in more detail.
The very initial version of this template was created by Sarah Gille. This current version of the template follows the guidelines in NSF GPG 15-1.
It is your responsibility to make sure that everything is in agreement with the current NSF GPG and your program solicitation. Good luck!