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evaluate provides tools that allow you to recreate the parsing, evaluation anddisplay of R code, with enough information that you can accurately recreate whathappens at the command line. Evaluate + replay works very similarly tosource(), but is written in such a way to make it easy to adapt for otheroutput formats, such as html or latex.

library(evaluate)

There are three components to theevaluate package:

• parse_all(), a version of parse that keeps expressions with their originalsource code, maintaining formatting and comments.
• evaluate(), which evaluates each expression produced byparse_all(),tracking all output, messages, warnings, and errors as their occur, andinterleaving them in the correct order with the original source and valueof the expression.
• replay(), which outputs these pieces in a way that makes it look like you'veentered the code at the command line. This function also serves as atemplate for other output formats.