bracer
provides support for performing brace expansions on strings in R.
library("bracer")
options(bracer.engine = "r")
expand_braces("Foo{A..F}")
## [1] "FooA" "FooB" "FooC" "FooD" "FooE" "FooF"
expand_braces("Foo{01..10}")
## [1] "Foo01" "Foo02" "Foo03" "Foo04" "Foo05" "Foo06" "Foo07" "Foo08" "Foo09"
## [10] "Foo10"
expand_braces("Foo{A..E..2}{1..5..2}")
## [1] "FooA1" "FooA3" "FooA5" "FooC1" "FooC3" "FooC5" "FooE1" "FooE3" "FooE5"
expand_braces("Foo{-01..1}")
## [1] "Foo-01" "Foo000" "Foo001"
expand_braces("Foo{{d..d},{bar,biz}}.{py,bash}")
## [1] "Food.py" "Food.bash" "Foobar.py" "Foobar.bash" "Foobiz.py"
## [6] "Foobiz.bash"
expand_braces
is vectorized and returns one big character vector of all the brace expansions. str_expand_braces
is an alternative that returns a list of character vectors.
expand_braces(c("Foo{A..F}", "Bar.{py,bash}", "{{Biz}}"))
## [1] "FooA" "FooB" "FooC" "FooD" "FooE" "FooF" "Bar.py"
## [8] "Bar.bash" "{{Biz}}"
str_expand_braces(c("Foo{A..F}", "Bar.{py,bash}", "{{Biz}}"))
## [[1]]
## [1] "FooA" "FooB" "FooC" "FooD" "FooE" "FooF"
##
## [[2]]
## [1] "Bar.py" "Bar.bash"
##
## [[3]]
## [1] "{{Biz}}"
glob
is a wrapper around Sys.glob
that uses expand_braces
to support both brace and wildcard expansion on file paths.
glob("R/*.{R,r,S,s}")
## [1] "R/engine-r.R" "R/engine-v8.R" "R/expand_braces.R"
## [4] "R/glob.R"
To install the release version on CRAN use the following command in R:
install.packages("bracer")
To install the developmental version use the following command in R:
remotes::install_github("trevorld/bracer")
Installing the suggested V8
package will enable use of the javascript alternative parser:
install.packages("V8")
The bracer
pure R parser currently does not properly support the "correct" (Bash-style) brace expansion under several edge conditions such as:
{{a,d}
(but you could use an escaped brace instead \\{{a,d}
){'a,b','c'}
(but you could use an escaped comma instead {a\\,b,c}
){a,b\\}c,d}
{a,\\\\{a,b}c}
X{a..#}X
options(bracer.engine = "r")
expand_braces("{{a,d}")
## [1] "{{a,d}"
expand_braces("{'a,b','c'}")
## [1] "'a" "b'" "'c'"
expand_braces("{a,b\\}c,d}")
## [1] "a,b}c" "d"
expand_braces("{a,\\\\{a,b}c}")
## [1] "ac}" "{ac}" "bc}"
expand_braces("X{a..#}X")
## [1] "X{a..#}X"
However if the 'V8' suggested R package is installed we can instead use an embedded version of the braces Javascript library which can correctly handle these edge cases. To do so we need to set the bracer "engine" to "v8".
options(bracer.engine = "v8")
expand_braces("{{a,d}")
## [1] "{a" "{d"
expand_braces("{'a,b','c'}")
## [1] "a,b" "c"
expand_braces("{a,b\\}c,d}")
## [1] "a" "b}c" "d"
expand_braces("{a,\\\\{a,b}c}")
## [1] "a" "\\ac" "\\bc"
expand_braces("X{a..#}X")
## [1] "XaX" "X`X" "X_X" "X^X" "X]X" "X\\X" "X[X" "XZX" "XYX" "XXX"
## [11] "XWX" "XVX" "XUX" "XTX" "XSX" "XRX" "XQX" "XPX" "XOX" "XNX"
## [21] "XMX" "XLX" "XKX" "XJX" "XIX" "XHX" "XGX" "XFX" "XEX" "XDX"
## [31] "XCX" "XBX" "XAX" "X@X" "X?X" "X>X" "X=X" "X<X" "X;X" "X:X"
## [41] "X9X" "X8X" "X7X" "X6X" "X5X" "X4X" "X3X" "X2X" "X1X" "X0X"
## [51] "X/X" "X.X" "X-X" "X,X" "X+X" "X*X" "X)X" "X(X" "X'X" "X&X"
## [61] "X%X" "X$X" "X#X"
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.