is.badval <- function(x)
{
is.na(x) || is.nan(x) || is.infinite(x)
}
is.inty <- function(x)
{
abs(x - round(x)) < 1e-10
}
is.zero <- function(x)
{
abs(x) < 1e-10
}
is.negative <- function(x)
{
x < 0
}
is.annoying <- function(x)
{
length(x) != 1 || is.badval(x)
}
check.is.flag <- function(x)
{
if (!is.logical(x) || is.annoying(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be TRUE or FALSE"), call.=FALSE)
}
invisible(TRUE)
}
check.is.scalar <- function(x)
{
if (!is.numeric(x) || is.annoying(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be a single number (not NA, Inf, NaN)"), call.=FALSE)
}
invisible(TRUE)
}
check.is.string <- function(x)
{
if (!is.character(x) || is.annoying(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be a single string"), call.=FALSE)
}
invisible(TRUE)
}
check.is.int <- function(x)
{
if (!is.numeric(x) || is.annoying(x) || !is.inty(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be an integer"), call.=FALSE)
}
invisible(TRUE)
}
check.is.natnum <- function(x)
{
if (!is.numeric(x) || is.annoying(x) || !is.inty(x) || is.negative(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be a natural number (0 or positive integer)"), call.=FALSE)
}
invisible(TRUE)
}
check.is.posint <- function(x)
{
if (!is.numeric(x) || is.annoying(x) || !is.inty(x) || is.negative(x) || is.zero(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be a positive integer"), call.=FALSE)
}
invisible(TRUE)
}
check.is.function <- function(x)
{
if (!is.function(x))
{
nm <- deparse(substitute(x))
stop(paste0("argument '", nm, "' must be a function"), call.=FALSE)
}
invisible(TRUE)
}
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