Request: Static function to check whether tex string is valid or not

[michaelniedermayr]

Description

First of all I want to say thank you for this library. This is exactly what we need for the math app we are currently working on.

About my feature request: It would be great if there was a static function that can be used to check whether a Tex string is valid or not before the widget is built. Thx a lot.

[creativecreatorormaybenot]

Thanks! That is a feature request we actually have ourselves 🙂

The function already exists - I will expose it in a PR soon 👍🏽

(if you are curious: Parser().parse().createWidget() is what you are looking for; https://github.com/simpleclub/CaTeX/blob/15c1a208004364d73eb306398d202de316d6cb5b/lib/src/widgets.dart#L64)

[michaelniedermayr]

Thanks for your answer. I tried the function Parser().parse().createWidget(). Surprisingly, it does not throw an error if I use an invalid string like r'\e'. That's the code I used:

try {
  NodeWidget _rootNode = Parser(r'\e', mode: startParsingMode).parse().createWidget(defaultCaTeXContext);
} on CaTeXException catch (e) {
  window.console.log(e);
}

If I use the same string to build a widget, the CaTeXException is thrown. Any ideas? But it is not that urgent. I can wait for the PR.

[creativecreatorormaybenot]

@michaelniedermayr Yes, that is an issue at the moment → symbols are evaluated at render box creation time (and they should not).

The current way to handle it is described here, but I want to change it 🙂