R/checkValid.R

In admisc: Adrian Dusa's Miscellaneous

# Copyright (c) 2019 - 2025, Adrian Dusa
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`checkValid` <- function(
    expression = "", snames = "", data = NULL, categories = list()
) {
    if (identical(snames, "")) {
        stopError("The expression cannot be verified without <snames>.")
    }
    allnames <- splitstr(snames)
    if (!is.null(data)) {
        allnames <- colnames(data)
        infodata <- getInfo(data)
        if (any(infodata$factor)) {
            allnames <- c(allnames, names(unlist(infodata$categories)))
        }
    }
    else if (length(categories) > 0) {
        allnames <- c(allnames, names(unlist(categories)))
    }
    allnames <- allnames[order(nchar(allnames), decreasing = TRUE)]
    for (n in allnames) {
        expression <- gsub(n, "", expression)
    }
    if (any(grepl(":alpha:", expression))) { 
        stopError(
            sprintf(
                "Part(s) of the expression not found in the %s.",
                ifelse(
                    is.null(data),
                    "<snames> argument",
                    "data"
                )
            )
        )
    }
}