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85 lines
3.8 KiB
R
85 lines
3.8 KiB
R
# ==================================================================== #
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# TITLE #
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# Antimicrobial Resistance (AMR) Analysis #
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# #
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# SOURCE #
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# https://gitlab.com/msberends/AMR #
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# #
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# LICENCE #
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# (c) 2019 Berends MS (m.s.berends@umcg.nl), Luz CF (c.f.luz@umcg.nl) #
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# #
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# This R package is free software; you can freely use and distribute #
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# it for both personal and commercial purposes under the terms of the #
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# GNU General Public License version 2.0 (GNU GPL-2), as published by #
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# the Free Software Foundation. #
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# #
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# This R package was created for academic research and was publicly #
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# released in the hope that it will be useful, but it comes WITHOUT #
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# ANY WARRANTY OR LIABILITY. #
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# Visit our website for more info: https://msberends.gitab.io/AMR. #
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# ==================================================================== #
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#' Pattern Matching
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#'
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#' Convenient wrapper around \code{\link[base]{grep}} to match a pattern: \code{a \%like\% b}. It always returns a \code{logical} vector and is always case-insensitive. Also, \code{pattern} (\code{b}) can be as long as \code{x} (\code{a}) to compare items of each index in both vectors.
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#' @inheritParams base::grepl
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#' @return A \code{logical} vector
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#' @name like
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#' @rdname like
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#' @export
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#' @details Using RStudio? This function can also be inserted from the Addins menu and can have its own Keyboard Shortcut like Ctrl+Shift+L or Cmd+Shift+L (see Tools > Modify Keyboard Shortcuts...).
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#' @source Idea from the \href{https://github.com/Rdatatable/data.table/blob/master/R/like.R}{\code{like} function from the \code{data.table} package}, but made it case insensitive at default and let it support multiple patterns.
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#' @seealso \code{\link[base]{grep}}
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#' @inheritSection AMR Read more on our website!
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#' @examples
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#' # simple test
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#' a <- "This is a test"
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#' b <- "TEST"
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#' a %like% b
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#' #> TRUE
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#' b %like% a
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#' #> FALSE
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#'
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#' # also supports multiple patterns, length must be equal to x
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#' a <- c("Test case", "Something different", "Yet another thing")
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#' b <- c("case", "diff", "yet")
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#' a %like% b
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#' #> TRUE TRUE TRUE
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#'
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#' # get frequencies of bacteria whose name start with 'Ent' or 'ent'
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#' library(dplyr)
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#' septic_patients %>%
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#' left_join_microorganisms() %>%
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#' filter(genus %like% '^ent') %>%
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#' freq(genus, species)
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like <- function(x, pattern) {
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if (length(pattern) > 1) {
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if (length(x) != length(pattern)) {
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pattern <- pattern[1]
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warning('only the first element of argument `pattern` used for `%like%`', call. = FALSE)
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} else {
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# x and pattern are of same length, so items with each other
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res <- vector(length = length(pattern))
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for (i in 1:length(res)) {
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if (is.factor(x[i])) {
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res[i] <- as.integer(x[i]) %in% base::grep(pattern[i], levels(x[i]), ignore.case = TRUE)
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} else {
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res[i] <- base::grepl(pattern[i], x[i], ignore.case = TRUE)
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}
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}
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return(res)
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}
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}
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# the regular way how grepl works; just one pattern against one or more x
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if (is.factor(x)) {
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as.integer(x) %in% base::grep(pattern, levels(x), ignore.case = TRUE)
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} else {
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base::grepl(pattern, x, ignore.case = TRUE)
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}
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}
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#' @rdname like
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#' @export
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"%like%" <- like
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