evalit 0.2.0-beta.0

a toy interpreter
Documentation 
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

use crate::{Object, RuntimeError, Value};

impl Object for bool {
    fn debug(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{self}")
    }

    fn equal(&self, other: &Value) -> Result<Value, RuntimeError> {
        if let Some(other) = other.downcast_ref::<bool>() {
            return Ok(Value::new(*self == *other));
        }

        Ok(Value::new(false))
    }

    fn compare(&self, other: &Value) -> Result<std::cmp::Ordering, RuntimeError> {
        if let Some(other) = other.downcast_ref::<bool>() {
            return Ok(self.cmp(other));
        }

        Err(RuntimeError::invalid_type::<bool>(other))
    }

    fn logic_and(&self, other: &Value) -> Result<Value, RuntimeError> {
        if let Some(other) = other.downcast_ref::<bool>() {
            return Ok(Value::new(*self && *other));
        }
        Err(RuntimeError::invalid_type::<bool>(other))
    }

    fn logic_or(&self, other: &Value) -> Result<Value, RuntimeError> {
        if let Some(other) = other.downcast_ref::<bool>() {
            return Ok(Value::new(*self || *other));
        }
        Err(RuntimeError::invalid_type::<bool>(other))
    }

    fn negate(&self) -> Result<Value, RuntimeError> {
        Ok(Value::new(!*self))
    }
}

impl PartialEq<bool> for Value {
    fn eq(&self, other: &bool) -> bool {
        match self.downcast_ref::<bool>() {
            Some(value) => *value == *other,
            None => false,
        }
    }
}