Inserting document compiled from LaTex code inside a .tex file

Question

Is there a way to insert a document within a document? The inserted code is fully .tex compliant and could be compiled as a document on its own.

I envision an article document, where inside the document, I show multiple beamer documents. The purpose of this is to demonstrate various beamer features and how they affect the final beamer presentation.

I would guess the code would look something like this,

\documentclass[article]
\usepackage{latexinsert} % hypothetical package

\begin{document}

\begin[frame = single]{insert_environment} % hypothetical environment name
%frame around the inserted document compiled from LaTeX code
\documentclass[article]
\usepackage{amsmath}

\begin{document}
Hello, world!
\begin{align*}
a^2 + b^2 = c^2
\end{align*}
\end{document}

\end{insert_environment}

\end{document}

Thanks for your assistance.

Answer 1

This sounds like a job for the standalone bundle. Note that I use the word 'bundle' because standalone represents both a documentclass and a package!

Let's say that you have a file framefile.tex that has the following code

\documentclass[beamer]{standalone}

\begin{document}

Hello, world!
\[
    a^2 + b^2 = c^2
\]
\end{document}

This file can be compiled on its own. Note that this file uses standalone as documentclass.

Now let's create your mainfile.tex which can input your framefile.tex

\documentclass{beamer}
\usepackage{standalone}

\begin{document}

\begin{frame}
    \input{framefile}
\end{frame}

\end{document}

Note that this file uses standalone as a package.