https://github.com/r-lib/evaluate

A version of eval for R that returns more information about what happened
https://github.com/r-lib/evaluate

evaluation parsing r r-package repl

Last synced: 2 days ago
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A version of eval for R that returns more information about what happened

• Host: GitHub
• URL: https://github.com/r-lib/evaluate
• Owner: r-lib
• License: other
• Created: 2008-05-18T13:40:10.000Z (over 16 years ago)
• Default Branch: main
• Last Pushed: 2024-12-20T14:50:46.000Z (22 days ago)
• Last Synced: 2025-01-03T00:04:41.026Z (9 days ago)
• Topics: evaluation, parsing, r, r-package, repl
• Language: R
• Homepage: http://evaluate.r-lib.org/
• Size: 1.78 MB
• Stars: 133
• Watchers: 13
• Forks: 35
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • Changelog: NEWS.md
  • Contributing: .github/CONTRIBUTING.md
  • License: LICENSE
  • Code of conduct: .github/CODE_OF_CONDUCT.md

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README

        
# evaluate

[![R-CMD-check](https://github.com/r-lib/evaluate/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/r-lib/evaluate/actions/workflows/R-CMD-check.yaml)

[![CRAN status](https://www.r-pkg.org/badges/version/evaluate)](https://CRAN.R-project.org/package=evaluate)

[![Downloads from the RStudio CRAN mirror](https://cranlogs.r-pkg.org/badges/evaluate)](https://cran.r-project.org/package=evaluate)

[![Codecov test coverage](https://codecov.io/gh/r-lib/evaluate/branch/main/graph/badge.svg)](https://app.codecov.io/gh/r-lib/evaluate?branch=main)

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.