Can pyparsing rules be written as a string to a variable?

Question

Python

Here is a simple parsing rule:

grammar = pp.Word(pp.alphas).suppress() + pp.Optional(':') + pp.Word(pp.nums)('code')

I would like to make it a string, like this:

grammar = '{{Suppress:(W:(ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz)) [":"]} W:(0123456789)}'

The task is such that I get the parsing rules via REST, of course, you can write it as program code to a file and connect it as a module via import, but this is dangerous. Malicious code may arrive, I want to avoid this.

Or maybe there are some ideas how to get out of this situation?

Answer 1

EBNF solution to this issue