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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
/// Assert a function ok() is greater than or equal to an expression.
///
/// * If true, return Result `Ok(())`.
///
/// * Otherwise, return Result `Err` with a diagnostic message.
///
/// This macro provides the same statements as [`assert_`],
/// except this macro returns a Result, rather than doing a panic.
///
/// This macro is useful for runtime checks, such as checking parameters,
/// or santizing inputs, or handling different results in different ways.
///
/// # Related
///
/// * [`assert_fn_ok_ge_expr`]
/// * [`assert_fn_ok_ge_expr_as_result`]
/// * [`debug_assert_fn_ok_ge_expr`]
///
#[macro_export]
macro_rules! assert_fn_ok_ge_expr_as_result {
//// Arity 1
($a_function:path, $a_param:expr, $b_expr:expr) => ({
let a_result = $a_function($a_param);
let a_is_ok = a_result.is_ok();
if !a_is_ok {
Err(format!(
concat!(
"assertion failed: `assert_fn_ok_ge_expr!(left_function, left_param, right_expr)`\n",
" left_function label: `{}`,\n",
" left_param label: `{}`,\n",
" left_param debug: `{:?}`,\n",
" right_expr label: `{}`,\n",
" right_expr debug: `{:?}`,\n",
" left result: `{:?}`",
),
stringify!($a_function),
stringify!($a_param), $a_param,
stringify!($b_expr), $b_expr,
a_result
))
} else {
let a_ok = a_result.unwrap();
if a_ok >= $b_expr {
Ok(())
} else {
Err(format!(
concat!(
"assertion failed: `assert_fn_ok_ge_expr!(left_function, left_param, right_expr)`\n",
" left_function label: `{}`,\n",
" left_param label: `{}`,\n",
" left_param debug: `{:?}`,\n",
" right_expr label: `{}`,\n",
" right_expr debug: `{:?}`,\n",
" left: `{:?}`,\n",
" right: `{:?}`",
),
stringify!($a_function),
stringify!($a_param), $a_param,
stringify!($b_expr), $b_expr,
a_ok,
$b_expr
))
}
}
});
//// Arity 0
($a_function:path, $b_expr:expr) => ({
let a_result = $a_function();
let a_is_ok = a_result.is_ok();
if !a_is_ok {
Err(format!(
concat!(
"assertion failed: `assert_fn_ok_ge_expr!(left_function, right_expr)`\n",
" left_function label: `{}`,\n",
" right_expr label: `{}`,\n",
" right_expr debug: `{:?}`,\n",
" left result: `{:?}`",
),
stringify!($a_function),
stringify!($b_expr), $b_expr,
a_result
))
} else {
let a_ok = a_result.unwrap();
if a_ok >= $b_expr {
Ok(())
} else {
Err(format!(
concat!(
"assertion failed: `assert_fn_ok_ge_expr!(left_function, right_expr)`\n",
" left_function label: `{}`,\n",
" right_expr label: `{}`,\n",
" right_expr debug: `{:?}`,\n",
" left: `{:?}`,\n",
" right: `{:?}`",
),
stringify!($a_function),
stringify!($b_expr), $b_expr,
a_ok,
$b_expr
))
}
}
});
}
#[cfg(test)]
mod tests {
mod assert_fn_ok_ge_expr_as_result {
mod arity_1 {
fn f(i: i8) -> Result<i8, i8> {
return Ok(i);
}
#[test]
fn test_gt() {
let a: i8 = 1;
let b: i8 = 0;
let x = assert_fn_ok_ge_expr_as_result!(f, a, b);
assert_eq!(x, Ok(()));
}
#[test]
fn test_eq() {
let a: i8 = 1;
let b: i8 = 1;
let x = assert_fn_ok_ge_expr_as_result!(f, a, b);
assert_eq!(x, Ok(()));
}
#[test]
fn test_lt() {
let a: i8 = 1;
let b: i8 = 2;
let x = assert_fn_ok_ge_expr_as_result!(f, a, b);
assert!(x.is_err());
assert_eq!(
x.unwrap_err(),
concat!(
"assertion failed: `assert_fn_ok_ge_expr!(left_function, left_param, right_expr)`\n",
" left_function label: `f`,\n",
" left_param label: `a`,\n",
" left_param debug: `1`,\n",
" right_expr label: `b`,\n",
" right_expr debug: `2`,\n",
" left: `1`,\n",
" right: `2`"
)
);
}
}
mod arity_0 {
fn f() -> Result<i8, i8> {
return Ok(1);
}
#[test]
fn test_gt() {
let b: i8 = 0;
let x = assert_fn_ok_ge_expr_as_result!(f, b);
assert_eq!(x, Ok(()));
}
#[test]
fn test_eq() {
let b: i8 = 1;
let x = assert_fn_ok_ge_expr_as_result!(f, b);
assert_eq!(x, Ok(()));
}
#[test]
fn test_lt() {
let b: i8 = 2;
let x = assert_fn_ok_ge_expr_as_result!(f, b);
assert!(x.is_err());
assert_eq!(
x.unwrap_err(),
concat!(
"assertion failed: `assert_fn_ok_ge_expr!(left_function, right_expr)`\n",
" left_function label: `f`,\n",
" right_expr label: `b`,\n",
" right_expr debug: `2`,\n",
" left: `1`,\n",
" right: `2`"
)
);
}
}
}
}
/// Assert a function ok() is greater than or equal to an expression.
///
/// * If true, return `()`.
///
/// * Otherwise, call [`panic!`] with a message and the values of the
/// expressions with their debug representations.
///
/// # Examples
///
/// ```rust
/// # #[macro_use] extern crate assertables;
/// # use std::panic;
/// fn f(i: i8) -> Result<String, String> {
/// match i {
/// 0..=9 => Ok(format!("{}", i)),
/// _ => Err(format!("{:?} is out of range", i)),
/// }
/// }
///
/// # fn main() {
/// // Return Ok
/// let a: i8 = 2;
/// let b = String::from("1");
/// assert_fn_ok_ge_expr!(f, a, b);
/// //-> ()
///
/// let a: i8 = 1;
/// let b = String::from("2");
/// // Panic with error message
/// let result = panic::catch_unwind(|| {
/// assert_fn_ok_ge_expr!(f, a, b);
/// //-> panic!
/// });
/// assert!(result.is_err());
/// let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
/// let expect = concat!(
/// "assertion failed: `assert_fn_ok_ge_expr!(left_function, left_param, right_expr)`\n",
/// " left_function label: `f`,\n",
/// " left_param label: `a`,\n",
/// " left_param debug: `1`,\n",
/// " right_expr label: `b`,\n",
/// " right_expr debug: `\"2\"`,\n",
/// " left: `\"1\"`,\n",
/// " right: `\"2\"`"
/// );
/// assert_eq!(actual, expect);
/// # }
/// ```
///
/// /// # Related
///
/// * [`assert_fn_ok_ge_expr`]
/// * [`assert_fn_ok_ge_expr_as_result`]
/// * [`debug_assert_fn_ok_ge_expr`]
///
#[macro_export]
macro_rules! assert_fn_ok_ge_expr {
//// Arity 1
($a_function:path, $a_param:expr, $b_expr:expr) => ({
match assert_fn_ok_ge_expr_as_result!($a_function, $a_param, $b_expr) {
Ok(()) => (),
Err(err) => panic!("{}", err),
}
});
($a_function:path, $a_param:expr, $b_expr:expr, $($message:tt)+) => ({
match assert_fn_ok_ge_expr_as_result!($a_function, $a_param, $b_expr) {
Ok(()) => (),
Err(_err) => panic!("{}", $($message)+),
}
});
//// Arity 0
($a_function:path, $b_expr:expr) => ({
match assert_fn_ok_ge_expr_as_result!($a_function, $b_expr) {
Ok(()) => (),
Err(err) => panic!("{}", err),
}
});
($a_function:path, $b_expr:expr, $($message:tt)+) => ({
match assert_fn_ok_ge_expr_as_result!($a_function, $b_expr) {
Ok(()) => (),
Err(_err) => panic!("{}", $($message)+),
}
});
}
/// Assert a function ok() is greater than or equal to an expression.
///
/// This macro provides the same statements as [`assert_fn_ok_ge_expr`],
/// except this macro's statements are only enabled in non-optimized
/// builds by default. An optimized build will not execute this macro's
/// statements unless `-C debug-assertions` is passed to the compiler.
///
/// This macro is useful for checks that are too expensive to be present
/// in a release build but may be helpful during development.
///
/// The result of expanding this macro is always type checked.
///
/// An unchecked assertion allows a program in an inconsistent state to
/// keep running, which might have unexpected consequences but does not
/// introduce unsafety as long as this only happens in safe code. The
/// performance cost of assertions, however, is not measurable in general.
/// Replacing `assert*!` with `debug_assert*!` is thus only encouraged
/// after thorough profiling, and more importantly, only in safe code!
///
/// This macro is intendend to work in a similar way to
/// [`std::debug_assert`](https://doc.rust-lang.org/std/macro.debug_assert.html).
///
/// # Related
///
/// * [`assert_fn_ok_ge_expr`]
/// * [`assert_fn_ok_ge_expr`]
/// * [`debug_assert_fn_ok_ge_expr`]
///
#[macro_export]
macro_rules! debug_assert_fn_ok_ge_expr {
($($arg:tt)*) => {
if $crate::cfg!(debug_assertions) {
$crate::assert_fn_ok_ge_expr!($($arg)*);
}
};
}