R/utilities.R

In CohortCosts: Direct Medical Cost Extraction and Health Economics Costing on OMOP CDM

# Utilities for validation, windowing, and in-database lifecycle

#' Validate window argument
#'
#' @param window A list of numeric vectors of length 2.
#' @param call Environment for error reporting.
#'
#' @return A named list of 2-element numeric vectors.
#' @noRd
validateWindow <- function(window, call = parent.frame()) {
  if (!is.list(window)) {
    if (is.numeric(window) && length(window) == 2) {
      window <- list(window)
    } else {
      cli::cli_abort("Argument 'window' must be a list of 2-element numeric vectors.", call = call)
    }
  }

  if (length(window) == 0) {
    cli::cli_abort("Argument 'window' cannot be empty.", call = call)
  }

  cleanWindow <- list()
  nms <- names(window)

  for (i in seq_along(window)) {
    w <- window[[i]]
    if (!is.numeric(w) || length(w) != 2) {
      cli::cli_abort("Each window element must be a numeric vector of length 2.", call = call)
    }
    if (is.na(w[1])) {
      w[1] <- -Inf
    }
    if (is.na(w[2])) {
      w[2] <- Inf
    }
    if (w[1] > w[2]) {
      cli::cli_abort(glue::glue("Window interval [{w[1]}, {w[2]}] is invalid: start cannot exceed end."), call = call)
    }

    wName <- if (!is.null(nms) && nms[i] != "") {
      tolower(nms[i])
    } else {
      sStr <- if (is.infinite(w[1])) "minf" else if (w[1] < 0) paste0("m", abs(w[1])) else as.character(w[1])
      eStr <- if (is.infinite(w[2])) "inf" else if (w[2] < 0) paste0("m", abs(w[2])) else as.character(w[2])
      tolower(paste0(sStr, "_to_", eStr))
    }
    cleanWindow[[wName]] <- w
  }

  cleanWindow
}

#' Validate index date column
#'
#' @param indexDate Character column name.
#' @param x Cohort table reference.
#' @param call Environment.
#'
#' @return Validated index date column name.
#' @noRd
validateIndexDate <- function(indexDate, x, call = parent.frame()) {
  omopgenerics::assertCharacter(indexDate, length = 1, call = call)
  if (!indexDate %in% colnames(x)) {
    cli::cli_abort(glue::glue("indexDate '{indexDate}' must be a column in x."), call = call)
  }
  indexDate
}

#' Validate censor date column
#'
#' @param censorDate Optional character column name.
#' @param x Cohort table reference.
#' @param call Environment.
#'
#' @return Validated censor date column name or NULL.
#' @noRd
validateCensorDate <- function(censorDate, x, call = parent.frame()) {
  if (is.null(censorDate)) {
    return(NULL)
  }
  omopgenerics::assertCharacter(censorDate, length = 1, call = call)
  if (!censorDate %in% colnames(x)) {
    cli::cli_abort(glue::glue("censorDate '{censorDate}' must be a column in x."), call = call)
  }
  censorDate
}

#' Validate target table name
#'
#' @param name Optional table name.
#' @param call Environment.
#'
#' @return Validated name string or NULL.
#' @noRd
validateName <- function(name, call = parent.frame()) {
  omopgenerics::assertCharacter(name, length = 1, null = TRUE, call = call)
}