Docs.

R/enum.R

@@ -1,16 +1,37 @@
 #' Create an enumerated type
 #'
 #' @description
-#' Creates an enumerated type with a fixed set of possible values.
+#' Creates an enumerated type with a fixed set of possible values. This function returns an enum generator,
+#' which can be used to create enum objects with values restricted to the specified set.
 #'
-#' @param ... The possible values for the enumerated type.
-#' @return A function that creates enum objects of the defined type.
+#' @param ... The possible values for the enumerated type. These should be unique character strings.
+#' @return A function (enum generator) that creates enum objects of the defined type.
 #' @export
 #'
 #' @examples
+#' # Create an enum type for colors
 #' Colors <- enum("red", "green", "blue")
+#'
+#' # Create enum objects
 #' my_color <- Colors("red")
-#' print(my_color)
+#' print(my_color)  # Output: Enum: red
+#'
+#' # Trying to create an enum with an invalid value will raise an error
+#' try(Colors("yellow"))
+#'
+#' # Enums can be used in interfaces
+#' ColoredShape <- interface(
+#'   shape = character,
+#'   color = Colors
+#' )
+#'
+#' my_shape <- ColoredShape(shape = "circle", color = "red")
+#'
+#' # Modifying enum values
+#' my_shape$color$value <- "blue"  # This is valid
+#' try(my_shape$color$value <- "yellow")  # This will raise an error
+#'
+#' @seealso \code{\link{interface}} for using enums in interfaces
 enum <- function(...) {
   values <- c(...)
 
@@ -28,18 +49,38 @@ enum <- function(...) {
 
 #' Print method for enum objects
 #'
+#' @description
+#' Prints a human-readable representation of an enum object.
+#'
 #' @param x An enum object
 #' @param ... Additional arguments (not used)
 #' @export
+#'
+#' @examples
+#' Colors <- enum("red", "green", "blue")
+#' my_color <- Colors("red")
+#' print(my_color)  # Output: Enum: red
 print.enum <- function(x, ...) {
   cat("Enum:", x$value, "\n")
 }
 
 #' Equality comparison for enum objects
 #'
+#' @description
+#' Compares two enum objects or an enum object with a character value.
+#'
 #' @param e1 First enum object
-#' @param e2 Second enum object or value
+#' @param e2 Second enum object or a character value
+#' @return Logical value indicating whether the two objects are equal
 #' @export
+#'
+#' @examples
+#' Colors <- enum("red", "green", "blue")
+#' color1 <- Colors("red")
+#' color2 <- Colors("blue")
+#' color1 == color2  # FALSE
+#' color1 == Colors("red")  # TRUE
+#' color1 == "red"  # TRUE
 `==.enum` <- function(e1, e2) {
   if (inherits(e2, "enum")) {
     e1$value == e2$value
@@ -50,9 +91,18 @@ print.enum <- function(x, ...) {
 
 #' Get value from enum object
 #'
+#' @description
+#' Retrieves the value of an enum object.
+#'
 #' @param x An enum object
 #' @param name The name of the field to access (should be "value")
+#' @return The value of the enum object
 #' @export
+#'
+#' @examples
+#' Colors <- enum("red", "green", "blue")
+#' my_color <- Colors("red")
+#' my_color$value  # "red"
 `$.enum` <- function(x, name) {
   if (name == "value") {
     x[["value"]]
@@ -63,10 +113,20 @@ print.enum <- function(x, ...) {
 
 #' Set value of enum object
 #'
+#' @description
+#' Sets the value of an enum object. The new value must be one of the valid enum values.
+#'
 #' @param x An enum object
 #' @param name The name of the field to set (should be "value")
 #' @param value The new value to set
+#' @return The updated enum object
 #' @export
+#'
+#' @examples
+#' Colors <- enum("red", "green", "blue")
+#' my_color <- Colors("red")
+#' my_color$value <- "blue"  # Valid assignment
+#' try(my_color$value <- "yellow")  # This will raise an error
 `$<-.enum` <- function(x, name, value) {
   if (name != "value") {
     stop("Cannot add new fields to an enum")
@@ -80,9 +140,16 @@ print.enum <- function(x, ...) {
 
 #' Print method for enum generators
 #'
+#' @description
+#' Prints a human-readable representation of an enum generator, showing all possible values.
+#'
 #' @param x An enum generator function
 #' @param ... Additional arguments (not used)
 #' @export
+#'
+#' @examples
+#' Colors <- enum("red", "green", "blue")
+#' print(Colors)  # Output: Enum generator: red, green, blue
 print.enum_generator <- function(x, ...) {
   cat("Enum generator:", paste(attr(x, "values"), collapse = ", "), "\n")
 }