1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
#' @include on-failure.r
NULL
is.integerish <- function(x) {
is.integer(x) || (is.numeric(x) && all(x == as.integer(x)))
}
# is.positive.integer
# is.negative.integer
# is.positive.double
# is.negative.double
is.named <- function(x) {
nm <- names(x)
!is.null(nm) && all(nm != "")
}
on_failure(is.named) <- function(call, env) {
paste0("Not all elements of ", deparse(call$x), " have names.")
}
#' Has attribute or name?
#'
#' @param x object to test
#' @param which name or attribute
#' @export
#' @examples
#' has_attr(has_attr, "fail")
#' x <- 10
#' x %has_attr% "a"
#'
#' y <- list(a = 1, b = 2)
#' see_if(y %has_name% "c")
has_attr <- function(x, which) !is.null(attr(x, which, exact = TRUE))
on_failure(has_attr) <- function(call, env) {
paste0(deparse(call$x), " does not have attribute ", eval(call$which, env))
}
#' @export
#' @rdname has_attr
"%has_attr%" <- has_attr
#' @export
#' @rdname has_attr
has_name <- function(x, which) which %in% names(x)
on_failure(has_name) <- function(call, env) {
paste0(deparse(call$x), " does not have name ", eval(call$which, env))
}
#' @export
#' @rdname has_attr
"%has_name%" <- has_name
#' Does object contain any missing values?
#'
#' @family assertions
#' @param x object to test
#' @export
#' @examples
#' see_if(noNA("a"))
#' see_if(noNA(c(TRUE, NA)))
#' x <- sample(c(1:10, NA), 100, rep = TRUE)
#' see_if(noNA(x))
noNA <- function(x) {
!(any(is.na(x)))
}
on_failure(noNA) <- function(call, env) {
n <- sum(is.na(eval(call$x, env)))
paste0(deparse(call$x), " contains ", n, " missing values")
}
#' Are two objects equal?
#'
#' @param x,y objects to compare
#' @param ... additional arguments passed to \code{\link{all.equal}}
#' @family assertions
#' @export
#' @examples
#' x <- 2
#' see_if(are_equal(x, 1.9))
#' see_if(are_equal(x, 1.999, tol = 0.01))
#' see_if(are_equal(x, 2))
are_equal <- function(x, y, ...) {
isTRUE(all.equal(x, y, ...))
}
on_failure(are_equal) <- function(call, env) {
paste0(deparse(call$x), " not equal to ", deparse(call$y))
}
#' Missing is functions.
#'
#' @param x object to test
#' @family assertions
#' @name assert-is
#' @aliases NULL
#' @examples
#' a <- Sys.time()
#' is.time(a)
#' b <- Sys.Date()
#' is.date(b)
#' c <- try(stop("!!"))
#' is.error(c)
NULL
#' @export
#' @rdname assert-is
is.error <- function(x) inherits(x, "try-error")
on_failure(is.error) <- function(call, env) {
paste0(deparse(call$x), " is not a try-error")
}
#' @export
#' @rdname assert-is
is.time <- function(x) inherits(x, "POSIXt")
on_failure(is.time) <- function(call, env) {
paste0(deparse(call$x), " is not a POSIXt date-time object")
}
#' @export
#' @rdname assert-is
is.date <- function(x) inherits(x, "Date")
on_failure(is.date) <- function(call, env) {
paste0(deparse(call$x), " is not a Date object")
}
#' Check a function has specified arguments
#'
#' @param f a function
#' @param args a character vector of argument names
#' @param exact if \code{TRUE}, argument names must match \code{args}
#' exactly (order and value); otherwise \code{f} just must have at least
#' \code{args} in any order
#' @export
#' @examples
#' has_args(mean, "x")
#' has_args(mean, "x", exact = TRUE)
#'
#' see_if(mean %has_args% "x")
#' see_if(mean %has_args% "y")
has_args <- function(f, args, exact = FALSE) {
assert_that(is.function(f))
if (exact) {
identical(args, names(formals(f)))
} else {
all(args %in% names(formals(f)))
}
}
on_failure(has_args) <- function(call, env) {
args <- paste(eval(call$args, env), collapse = ", ")
paste0("Function " , deparse(call$f), " does not have arguments ", args)
}
#' @export
#' @rdname has_args
"%has_args%" <- function(f, args) has_args(f, args)
#' Check an object doesn't have any empty dimensions
#'
#' @param x object to test
#' @family assertions
#' @export
#' @examples
#' not_empty(numeric())
#' not_empty(mtcars[0, ])
#' not_empty(mtcars[, 0])
not_empty <- function(x) {
all((dim(x) %||% length(x)) != 0)
}
on_failure(not_empty) <- function(call, env) {
paste0(deparse(call$x), " has an empty dimension")
}
|
