R/utils.R

In ggip: Data Visualization for IP Addresses and Networks

# these functions are copied from ggplot2

# Use chartr() for safety since toupper() fails to convert i to I in Turkish locale
lower_ascii <- "abcdefghijklmnopqrstuvwxyz"
upper_ascii <- "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
to_lower_ascii <- function(x) chartr(upper_ascii, lower_ascii, x)

snakeize <- function(x) {
  x <- gsub("([A-Za-z])([A-Z])([a-z])", "\\1_\\2\\3", x)
  x <- gsub(".", "_", x, fixed = TRUE)
  x <- gsub("([a-z])([A-Z])", "\\1_\\2", x)
  to_lower_ascii(x)
}

snake_class <- function(x) {
  snakeize(class(x)[1])
}

# Convenience function used by `stat_function()` and
# `geom_function()` to convert empty input data into
# non-empty input data without touching any non-empty
# input data that may have been provided.
ensure_nonempty_data <- function(data) {
  if (empty(data)) {
    data.frame(group = 1)
  } else {
    data
  }
}

empty <- function(df) {
  is.null(df) || nrow(df) == 0 || ncol(df) == 0 || is.waive(df)
}

is.waive <- function(x) inherits(x, "waiver")