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#_______________________________________________________________________________
#---- pattern class ----
#_______________________________________________________________________________
#'
#' Pattern class.
#'
#' @export
setClass(
"pattern",
representation(
),
contains="character",
validity=function(object) {
if (object %>% as.character() %>% length()!=1) {
return("Invalid pattern. Pattern must be a single character string.")
}
return(TRUE)
}
)
#'
#' Create a pattern.
#'
#' @param x regular expression
#' @return a pattern
#' @export
Pattern <- function(x) {
return(new("pattern", x))
}
#_______________________________________________________________________________
#---- variable_pattern class ----
#_______________________________________________________________________________
#'
#' Variable pattern class.
#'
#' @export
setClass(
"variable_pattern",
representation(
),
contains="pattern"
)
#'
#' Create a variable pattern.
#'
#' @param x variable name
#' @return a variable pattern
#' @export
VariablePattern <- function(x) {
return(new("variable_pattern", x))
}
#_______________________________________________________________________________
#---- replaceAll ----
#_______________________________________________________________________________
#' @rdname replaceAll
setMethod("replaceAll", signature=c("character", "variable_pattern", "character"), definition=function(object, pattern, replacement, ...) {
return(gsub(paste0("([^a-zA-Z0-9_]|^)(", pattern, ")([^a-zA-Z0-9_]|$)"), replacement=paste0("\\1", replacement, "\\3"), x=object))
})
#' @rdname replaceAll
setMethod("replaceAll", signature=c("character", "pattern", "character"), definition=function(object, pattern, replacement, ...) {
return(gsub(pattern, replacement=replacement, x=object))
})
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