evaluate v0.14

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Parsing and Evaluation Tools that Provide More Details than the Default

Parsing and evaluation tools that make it easy to recreate the command line behaviour of R.

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Evaluate

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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.

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.

Functions in evaluate

Name Description
line_prompt Line prompt.
remove_hooks Remove hooks.
set_hooks Set hooks.
replay Replay a list of evaluated results.
try_capture_stack Try, capturing stack on error.
flush_console An emulation of flush.console() in evaluate()
inject_funs Inject functions into the environment of evaluate()
watchout Watch for changes in output, text and graphical.
is.message Object class tests
new_output_handler Custom output handlers.
parse_all Parse, retaining comments.
create_traceback Generate a traceback from a list of calls.
evaluate Evaluate input and return all details of evaluation.
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Details

Type Package
License MIT + file LICENSE
URL https://github.com/r-lib/evaluate
BugReports https://github.com/r-lib/evaluate/issues
RoxygenNote 6.1.1
Encoding UTF-8
NeedsCompilation no
Packaged 2019-05-28 15:30:02 UTC; yihui
Repository CRAN
Date/Publication 2019-05-28 15:50:02 UTC

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