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Merge pull request #101 from lovasoa/main

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Add support for is_nan and other floating-point functions
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ISibboI 2022-04-07 16:19:16 +03:00 committed by GitHub
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4 changed files with 57 additions and 1 deletions
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5
README.md
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@ -345,6 +345,11 @@ This crate offers a set of builtin functions.
| `round` | 1 | Numeric | Returns the nearest integer to a number. Rounds half-way cases away from 0.0 |
| `ceil` | 1 | Numeric | Returns the smallest integer greater than or equal to a number |
| `if` | 3 | Boolean, Any, Any | If the first argument is true, returns the second argument, otherwise, returns the third |
| `typeof` | 1 | Any | returns "string", "float", "int", "boolean", "tuple", or "empty" depending on the type of the argument |
| `math::is_nan` | 1 | Numeric | Returns true if the argument is the floating-point value NaN, false if it is another floating-point value, and throws an error if it is not a number |
| `math::is_finite` | 1 | Numeric | Returns true if the argument is a finite floating-point number, false otherwise |
| `math::is_infinite` | 1 | Numeric | Returns true if the argument is an infinite floating-point number, false otherwise |
| `math::is_normal` | 1 | Numeric | Returns true if the argument is a floating-point number that is neither zero, infinite, [subnormal](https://en.wikipedia.org/wiki/Subnormal_number), or NaN, false otherwise |
| `math::ln` | 1 | Numeric | Returns the natural logarithm of the number |
| `math::log` | 2 | Numeric, Numeric | Returns the logarithm of the number with respect to an arbitrary base |
| `math::log2` | 1 | Numeric | Returns the base 2 logarithm of the number |

22
src/function/builtin.rs
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@ -23,6 +23,12 @@ macro_rules! simple_math {
};
}
fn float_is(func: fn(f64) -> bool) -> Option<Function> {
Some(Function::new(move |argument| {
Ok(func(argument.as_number()?).into())
}))
}
macro_rules! int_function {
($func:ident) => {
Some(Function::new(|argument| {
@ -76,7 +82,23 @@ pub fn builtin_function(identifier: &str) -> Option<Function> {
"floor" => simple_math!(floor),
"round" => simple_math!(round),
"ceil" => simple_math!(ceil),
// Float special values
"math::is_nan" => float_is(f64::is_nan),
"math::is_finite" => float_is(f64::is_finite),
"math::is_infinite" => float_is(f64::is_infinite),
"math::is_normal" => float_is(f64::is_normal),
// Other
"typeof" => Some(Function::new(move |argument| {
Ok(match argument {
Value::String(_) => "string",
Value::Float(_) => "float",
Value::Int(_) => "int",
Value::Boolean(_) => "boolean",
Value::Tuple(_) => "tuple",
Value::Empty => "empty",
}
.into())
})),
"min" => Some(Function::new(|argument| {
let arguments = argument.as_tuple()?;
let mut min_int = IntType::max_value();

5
src/lib.rs
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@ -328,6 +328,11 @@
//! | `round` | 1 | Numeric | Returns the nearest integer to a number. Rounds half-way cases away from 0.0 |
//! | `ceil` | 1 | Numeric | Returns the smallest integer greater than or equal to a number |
//! | `if` | 3 | Boolean, Any, Any | If the first argument is true, returns the second argument, otherwise, returns the third |
//! | `typeof` | 1 | Any | returns "string", "float", "int", "boolean", "tuple", or "empty" depending on the type of the argument |
//! | `math::is_nan` | 1 | Numeric | Returns true if the argument is the floating-point value NaN, false if it is another floating-point value, and throws an error if it is not a number |
//! | `math::is_finite` | 1 | Numeric | Returns true if the argument is a finite floating-point number, false otherwise |
//! | `math::is_infinite` | 1 | Numeric | Returns true if the argument is an infinite floating-point number, false otherwise |
//! | `math::is_normal` | 1 | Numeric | Returns true if the argument is a floating-point number that is neither zero, infinite, [subnormal](https://en.wikipedia.org/wiki/Subnormal_number), or NaN, false otherwise |
//! | `math::ln` | 1 | Numeric | Returns the natural logarithm of the number |
//! | `math::log` | 2 | Numeric, Numeric | Returns the logarithm of the number with respect to an arbitrary base |
//! | `math::log2` | 1 | Numeric | Returns the base 2 logarithm of the number |

26
tests/integration.rs
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@ -362,7 +362,25 @@ fn test_builtin_functions() {
assert_eq!(eval("round(1.9)"), Ok(Value::Float(2.0)));
assert_eq!(eval("ceil(1.1)"), Ok(Value::Float(2.0)));
assert_eq!(eval("ceil(1.9)"), Ok(Value::Float(2.0)));
assert_eq!(eval("math::is_nan(1.0/0.0)"), Ok(Value::Boolean(false)));
assert_eq!(eval("math::is_nan(0.0/0.0)"), Ok(Value::Boolean(true)));
assert_eq!(eval("math::is_finite(1.0/0.0)"), Ok(Value::Boolean(false)));
assert_eq!(eval("math::is_finite(0.0/0.0)"), Ok(Value::Boolean(false)));
assert_eq!(eval("math::is_finite(0.0)"), Ok(Value::Boolean(true)));
assert_eq!(
eval("math::is_infinite(0.0/0.0)"),
Ok(Value::Boolean(false))
);
assert_eq!(eval("math::is_infinite(1.0/0.0)"), Ok(Value::Boolean(true)));
assert_eq!(eval("math::is_normal(1.0/0.0)"), Ok(Value::Boolean(false)));
assert_eq!(eval("math::is_normal(0)"), Ok(Value::Boolean(false)));
// Other
assert_eq!(eval("typeof(4.0, 3)"), Ok(Value::String("tuple".into())));
assert_eq!(eval("typeof(4.0)"), Ok(Value::String("float".into())));
assert_eq!(eval("typeof(4)"), Ok(Value::String("int".into())));
assert_eq!(eval("typeof(\"\")"), Ok(Value::String("string".into())));
assert_eq!(eval("typeof(true)"), Ok(Value::String("boolean".into())));
assert_eq!(eval("typeof()"), Ok(Value::String("empty".into())));
assert_eq!(eval("min(4.0, 3)"), Ok(Value::Int(3)));
assert_eq!(eval("max(4.0, 3)"), Ok(Value::Float(4.0)));
assert_eq!(eval("len(\"foobar\")"), Ok(Value::Int(6)));
@ -430,10 +448,16 @@ fn test_errors() {
eval("true-"),
Err(EvalexprError::WrongOperatorArgumentAmount {
actual: 1,
expected: 2
expected: 2,
})
);
assert_eq!(eval("!(()true)"), Err(EvalexprError::AppendedToLeafNode));
assert_eq!(
eval("math::is_nan(\"xxx\")"),
Err(EvalexprError::ExpectedNumber {
actual: Value::String("xxx".to_string())
})
);
}
#[test]