pryr v0.1.4
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Tools for Computing on the Language
Useful tools to pry back the covers of R and understand the
language at a deeper level.
Readme
pryr (rhymes with pry bar)
pryr provides tools to pry back the surface of R and dig into the details. It
has been developed in conjunction with
"Advanced R programming" to make
it easier to understand what's going on in R.
Install it from CRAN with install.packages("pryr").
Tools
pryr includes tools to:
Make it easier to understand the internal implementation of:
- promises:
uneval(),is_promise(),promise_info() - scoping and environments:
where(),rls(),parenv() - closures:
unenclose() - calls and expressions:
call_tree() - primitive types:
typenames() - copy-on-modify:
address(),track_copy()
- promises:
Inspect and understand R's OO systems:
- Determine which OO system an object belongs to:
otype() - Determine which OO system a function belongs to:
ftype()
- Determine which OO system an object belongs to:
Make it easier to compute on the language:
- Alternative ways to create functions:
make_function(),f() - A version of substitute that uses regular evaluation,
substitute_q(), and one that will substitute objects in the global environment,subs() - Tools to modify language objects:
modify_lang() dots()andnamed_dots()to get unevaluated...- Partial function evaluation:
partial() - Find all functions matching some criteria:
find_funs()
- Alternative ways to create functions:
To use existing R tools more easily:
%<d-%and%<a-%for creating delayed or active bindings%<c-%for creating constants (locked bindings)rebindas a more user friendly version of<<-
Functions in pryr
| Name | Description | |
| mem_used | How much memory is currently used by R? | |
| parent_promise | Find the parent (first) promise. | |
| rls | Recursive ls. | |
| rebind | Rebind an existing name. | |
| sexp_type | Inspect internal attributes of R objects. | |
| track_copy | Track if an object is copied | |
| otype | Determine object type. | |
| method_from_call | Given a function class, find correspoding S4 method | |
| partial | Partial apply a function, filling in some arguments. | |
| unenclose | Unenclose a closure. | |
| print.envlist | Print an envlist | |
| modify_call | Modify the arguments of a call. | |
| make_function | Make a function from its components. | |
| mem_change | Determine change in memory from running code | |
| modify_lang | Recursively modify a language object | |
| substitute_q | A version of substitute that evaluates its first argument. | |
| subs | A version of substitute that works in the global environment. | |
| object_size | Compute the size of an object. | |
| names_c | Extract function table from names.c from R subversion repository. | |
| uneval | Capture the call associated with a promise. | |
| parenv | Get parent/ancestor environment | |
| parenvs | Given an environment or object, return an envlist of its parent environments. | |
| where | Find where a name is defined. | |
| show_c_source | Find C source code for internal R functions | |
| standardise_call | Standardise a function call | |
| %<c-% | Create a constant (locked) binding. | |
| call_tree | Display a call (or expression) as a tree. | |
| %<d-% | Create an delayed binding. | |
| compose | Compose multiple functions | |
| bytes | Print the byte-wise representation of a value | |
| dots | Capture unevaluated dots. | |
| enclosing_env | Find the environment that encloses of a function. | |
| explicit | Tools for making promises explicit | |
| is_active_binding | Active binding info | |
| fget | Find a function with specified name. | |
| is_promise | Promise info | |
| f | A compact syntax for anonymous functions. | |
| %<a-% | Create an active binding. | |
| make_call | Make and evaluate calls. | |
| is_s3_generic | Determine if a function is an S3 generic or S3 method. | |
| as.envlist | Convert a list of environments to an envlist object. | |
| ftype | Determine function type. | |
| find_uses | Find all functions in that call supplied functions. | |
| find_funs | Find functions matching criteria. | |
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Details
| License | GPL-2 |
| URL | https://github.com/hadley/pryr |
| BugReports | https://github.com/hadley/pryr/issues |
| LinkingTo | Rcpp |
| RoxygenNote | 6.0.1 |
| NeedsCompilation | yes |
| Packaged | 2018-02-17 16:16:12 UTC; hadley |
| Repository | CRAN |
| Date/Publication | 2018-02-18 04:42:23 UTC |
| imports | codetools , methods , Rcpp (>= 0.11.0) , stringr |
| depends | R (>= 3.1.0) |
| suggests | testthat (>= 0.8.0) |
| Contributors | R Core team |
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