LaTeX: Correct Math Scope Context Matching

[sleepymalc]

Before, I used the following context-matching code for detecting math scope for $\LaTeX$:

global
function math(context) {
    return context.scopes.some(s => s.startsWith("meta.math")) && !context.scopes.some(s => s.startsWith("comment") || s.startsWith("meta.text.normal.tex"));
}
endglobal

However, this leads to some problems. For example, sometimes, in the equation, I want to write

\[
    x_n = x \text{ for some \(n\) large enough},
\]

Such a case is fine since the math I want to write in the text scope is simple, just \(n\). However, in the current (and perhaps most popular) scope function, it happens that \(\text{ \( not in the math mode \) }\).

To overcome this, I write the following more generic version:

global
function math(context) {
    return  context.scopes.findLastIndex(s => s.startsWith("meta.math")) > context.scopes.findLastIndex(s => s.startsWith("comment") || s.startsWith("meta.text.normal.tex"));
}
endglobal

So, since the nested environment is ordered in the scope, this will always return the correct mode. Even better, there will be no undefined behavior since if the .findLastIndex can't find either, it will return -1 instead of something undefined, so everything is handled.