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Great post! I have played with getParseData in hopes of taking R scripts as input, find all functions and the functions those functions call etc. I thought it would be nice to have tree shaking and minify R code for production (i.e. shrinking docker image size). I know Rcpp etc might pose a problem, but per R code should be OK. XML might be useful for that too!
Wow. xmlparsedata is a great find! Thanks for the exposition.