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# evaluate
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[](https://github.com/r-lib/evaluate/actions/workflows/R-CMD-check.yaml)
[](https://CRAN.R-project.org/package=evaluate)
[](https://cran.r-project.org/package=evaluate)
[](https://app.codecov.io/gh/r-lib/evaluate?branch=main)
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evaluate provides tools that allow you to recreate the parsing, evaluation and
display of R code, with enough information that you can accurately recreate what
happens at the command line. Evaluate + replay works very similarly to
`source()`, but is written in such a way to make it easy to adapt for other
output formats, such as html or latex.
```R
library(evaluate)
```
There are three components to the `evaluate` package:
* `parse_all()`, a version of parse that keeps expressions with their original
source code, maintaining formatting and comments.
* `evaluate()`, which evaluates each expression produced by `parse_all()`,
tracking all output, messages, warnings, and errors as their occur, and
interleaving them in the correct order with the original source and value
of the expression.
* `replay()`, which outputs these pieces in a way that makes it look like you've
entered the code at the command line. This function also serves as a
template for other output formats.
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