| Type: | Package |
| Title: | Backward Pipe (Right-to-Left) Operator |
| Version: | 0.2.3 |
| Date: | 2018-06-25 |
| Description: | Provides a backward-pipe operator for 'magrittr' (%<%) or 'pipeR' (%<<%) that allows for a performing operations from right-to-left. This allows writing more legible code where right-to-left ordering is natural. This is common with hierarchies and nested structures such as trees, directories or markup languages (e.g. HTML and XML). The package also includes a R-Studio add-in that can be bound to a keyboard shortcut. |
| Depends: | R (≥ 3.1.0) |
| Suggests: | magrittr (≥ 1.5), pipeR (≥ 0.6.0.6), R6 (≥ 2.1.1), testthat (≥ 1.0.0), shiny (≥ 0.12.1), knitr (≥ 1.11), rstudioapi (≥ 0.7), rmarkdown |
| License: | GPL-2 | file LICENSE |
| URL: | https://github.com/decisionpatterns/backpipe |
| BugReports: | https://github.com/decisionpatterns/backpipe/issues |
| RoxygenNote: | 6.0.1.9000 |
| Encoding: | UTF-8 |
| VignetteBuilder: | knitr |
| Repository: | CRAN |
| NeedsCompilation: | no |
| Packaged: | 2018-06-25 23:34:55 UTC; cbrown |
| Author: | Christopher Brown [aut, cre], Decision Patterns [cph] |
| Maintainer: | Christopher Brown <chris.brown@decisionpatterns.com> |
| Date/Publication: | 2018-06-26 04:38:34 UTC |
backpipes: %<%, %<<%
Description
Provides back-piping operators %<% (magrittr) or
%<<% (pipeR) allowing a reverses (right-to-left) order of
arguments
Usage
lhs %<% rhs
lhs %<<% rhs
Arguments
lhs |
argument on the lhs of the backpipe |
rhs |
argument on the rhs of the backpipe |
Details
-
%<%works with magrittr.%<<%works with piper. They are both based onbackpipe.
Other magrittr operators and complex expressions are not supported yet.
It is not possible to mix forward and and backward piping in the same expression because of likely ambiguous results.
References
https://github.com/smbache/magrittr/issues/26
http://stackoverflow.com/questions/31305342/is-right-to-left-operator-associativity-in-r-possible
See Also
Examples
## Not run:
require(magrittr)
letters %>% paste0( 1:26 ) # forward pipe
paste0( 1:26 ) %<% letters # backward pipe
mean %<% range( na.rm = TRUE ) %<% c(1:5, NA)
## End(Not run)
## Not run:
require(pipeR)
letters %>>% paste0( 1:26 ) # forward pipe
paste0( 1:26 ) %<<% letters # backward pipe
mean %<<% range( na.rm = TRUE ) %<<% c(1:5, NA)
## End(Not run)
## Not run:
require(shiny)
div( class="outer-outer") %<%
div( class="outer") %<%
div( class="inner") %<%
h1( "content", role="heading" )
## End(Not run)
backpipe
Description
Creates backpiping operators
Usage
backpipe(pipe, backpipe = gsub(">", "<", pipe))
Arguments
pipe |
character; string representing the existing pipe operator |
backpipe |
character; string representing the desired backpipe operator |
Details
Only pipe is necessary. Arbitrary mixing of forward and reverse are
not allowed.
References
https://github.com/smbache/magrittr/issues/26
http://stackoverflow.com/questions/31305342/is-right-to-left-operator-associativity-in-r-possible
See Also
Examples
backpipe('%>%')
backpipe('%>>%', '%<<%')
Insert backpipe
Description
Call this function to insert %<-% at the cursor position.
Usage
insert_backpipe()
Details
Use Tools > Modify Keyboard Shortcuts to bind a ->.; ->.;