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AMR/R/like.R

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R
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# ==================================================================== #
# TITLE #
# Antimicrobial Resistance (AMR) Analysis #
# #
# SOURCE #
# https://github.com/msberends/AMR #
# #
# LICENCE #
# (c) 2018-2020 Berends MS, Luz CF et al. #
# #
# This R package is free software; you can freely use and distribute #
# it for both personal and commercial purposes under the terms of the #
# GNU General Public License version 2.0 (GNU GPL-2), as published by #
# the Free Software Foundation. #
# #
# We created this package for both routine data analysis and academic #
# research and it was publicly released in the hope that it will be #
# useful, but it comes WITHOUT ANY WARRANTY OR LIABILITY. #
# Visit our website for more info: https://msberends.github.io/AMR. #
# ==================================================================== #
#' Pattern Matching
#'
#' Convenient wrapper around [grep()] to match a pattern: `x %like% pattern`. It always returns a [`logical`] vector and is always case-insensitive (use `x %like_case% pattern` for case-sensitive matching). Also, `pattern` can be as long as `x` to compare items of each index in both vectors, or they both can have the same length to iterate over all cases.
#' @inheritSection lifecycle Stable lifecycle
#' @param x a character vector where matches are sought, or an object which can be coerced by [as.character()] to a character vector.
#' @param pattern a character string containing a regular expression (or [`character`] string for `fixed = TRUE`) to be matched in the given character vector. Coerced by [as.character()] to a character string if possible. If a [`character`] vector of length 2 or more is supplied, the first element is used with a warning.
#' @param ignore.case if `FALSE`, the pattern matching is *case sensitive* and if `TRUE`, case is ignored during matching.
#' @return A [`logical`] vector
#' @name like
#' @rdname like
#' @export
#' @details
#' The `%like%` function:
#' * Is case-insensitive (use `%like_case%` for case-sensitive matching)
#' * Supports multiple patterns
#' * Checks if `pattern` is a regular expression and sets `fixed = TRUE` if not, to greatly improve speed
#' * Tries again with `perl = TRUE` if regex fails
#'
#' 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...`).
#' @source Idea from the [`like` function from the `data.table` package](https://github.com/Rdatatable/data.table/blob/master/R/like.R)
#' @seealso [grep()]
#' @inheritSection AMR Read more on our website!
#' @examples
#' # simple test
#' a <- "This is a test"
#' b <- "TEST"
#' a %like% b
#' #> TRUE
#' b %like% a
#' #> FALSE
#'
#' # also supports multiple patterns, length must be equal to x
#' a <- c("Test case", "Something different", "Yet another thing")
#' b <- c( "case", "diff", "yet")
#' a %like% b
#' #> TRUE TRUE TRUE
#'
#' # get isolates whose name start with 'Ent' or 'ent'
#' \dontrun{
#' library(dplyr)
#' example_isolates %>%
#' filter(mo_name(mo) %like% "^ent")
#' }
like <- function(x, pattern, ignore.case = TRUE) {
# set to fixed if no regex found
fixed <- all(!grepl("[\\[$.^*?+-}{|)(]", pattern))
if (ignore.case == TRUE) {
# set here, otherwise if fixed = TRUE, this warning will be thrown: argument 'ignore.case = TRUE' will be ignored
x <- tolower(x)
pattern <- tolower(pattern)
}
if (length(pattern) > 1 & length(x) == 1) {
x <- rep(x, length(pattern))
}
if (length(pattern) > 1) {
res <- vector(length = length(pattern))
if (length(x) != length(pattern)) {
if (length(x) == 1) {
x <- rep(x, length(pattern))
}
# return TRUE for every 'x' that matches any 'pattern', FALSE otherwise
for (i in seq_len(length(res))) {
if (is.factor(x[i])) {
res[i] <- as.integer(x[i]) %in% grep(pattern[i], levels(x[i]), ignore.case = FALSE, fixed = fixed)
} else {
res[i] <- grepl(pattern[i], x[i], ignore.case = FALSE, fixed = fixed)
}
}
res <- sapply(pattern, function(pttrn) grepl(pttrn, x, ignore.case = FALSE, fixed = fixed))
res2 <- as.logical(rowSums(res))
# get only first item of every hit in pattern
res2[duplicated(res)] <- FALSE
res2[rowSums(res) == 0] <- NA
return(res2)
} else {
# x and pattern are of same length, so items with each other
for (i in seq_len(length(res))) {
if (is.factor(x[i])) {
res[i] <- as.integer(x[i]) %in% grep(pattern[i], levels(x[i]), ignore.case = FALSE, fixed = fixed)
} else {
res[i] <- grepl(pattern[i], x[i], ignore.case = FALSE, fixed = fixed)
}
}
return(res)
}
}
# the regular way how grepl works; just one pattern against one or more x
if (is.factor(x)) {
as.integer(x) %in% grep(pattern, levels(x), ignore.case = FALSE, fixed = fixed)
} else {
tryCatch(grepl(pattern, x, ignore.case = FALSE, fixed = fixed),
error = function(e) {
if (grepl("invalid reg(ular )?exp", e$message, ignore.case = TRUE)) {
# try with perl = TRUE:
return(grepl(pattern = pattern,
x = x,
ignore.case = FALSE,
fixed = fixed,
perl = TRUE))
} else {
# stop otherwise
stop(e$message)
}
})
}
}
#' @rdname like
#' @export
"%like%" <- function(x, pattern) {
like(x, pattern, ignore.case = TRUE)
}
#' @rdname like
#' @export
"%like_case%" <- function(x, pattern) {
like(x, pattern, ignore.case = FALSE)
}