| Type: | Package |
| Title: | Dynamic String Formatting |
| Version: | 0.1.2 |
| Author: | Alexander Hoyle |
| Maintainer: | Alexander Hoyle <alexander@alexanderhoyle.com> |
| Description: | Pass named and unnamed character vectors into specified positions in strings. This represents an attempt to replicate some of python's string formatting. |
| License: | MIT + file LICENSE |
| Encoding: | UTF-8 |
| LazyData: | true |
| RoxygenNote: | 6.0.1 |
| Imports: | stringr |
| NeedsCompilation: | no |
| Packaged: | 2017-12-16 16:54:53 UTC; ahoyl |
| Repository: | CRAN |
| Date/Publication: | 2017-12-17 06:51:48 UTC |
Concatenate two strings.
Description
%p% and %s% are wrappers for paste0(..., collapse = '') and
paste(..., collapse = ' '), respectively, which combine two character vectors.
Usage
x %p% y
x %s% y
Arguments
x, y |
A character vector |
Examples
'the quick brown fox jum' %p% 'ped over the lazy dog'
gen_sql <- function(column, table) "SELECT" %s% column %s% "FROM" %s% table
Pass variables into strings
Description
Pass variables into strings using pairs of curly brackets to identify points of insertion.
Usage
string %f% args
Arguments
string |
A character vector |
args |
A (possibly named) atomic vector |
Examples
# order matters when not using a named vector
'the quick {} fox jumped {} the lazy {}' %f% c('brown', 'over', 'dog')
# use a named vector to insert values by referencing them in the string
gen_sql_query <- function(column, table, id){
query <- "SELECT {col} FROM {tab} WHERE pk = {id}"
query %f% c(col = column, tab = table, id = id)
}
gen_sql_query('LASTNAME', 'STUDENTS', '12345')
# `%f%` is vectorized
v <- c('{vegetable}', '{animal}', '{mineral}', '{animal} and {mineral}')
v %f% c(vegetable = 'carrot', animal = 'porpoise', mineral = 'salt')
# if the number of replacements is larger than the length of unnamed arguments,
# `%f%` will recycle the arguments (and give a warning)
c('{} {}', '{} {} {}', '{}') %f% c(0, 1)
# > "0 1" "0 1 0" "0"