wasmtime_interface_types/
value.rs

1use std::convert::TryFrom;
2use std::fmt;
3
4/// The set of all possible WebAssembly Interface Types
5#[derive(Debug, Clone)]
6#[allow(missing_docs)]
7pub enum Value {
8    String(String),
9    I32(i32),
10    U32(u32),
11    I64(i64),
12    U64(u64),
13    F32(f32),
14    F64(f64),
15}
16
17macro_rules! from {
18    ($($a:ident => $b:ident,)*) => ($(
19        impl From<$a> for Value {
20            fn from(val: $a) -> Value {
21                Value::$b(val)
22            }
23        }
24
25        impl TryFrom<Value> for $a {
26            type Error = anyhow::Error;
27
28            fn try_from(val: Value) -> Result<$a, Self::Error> {
29                match val {
30                    Value::$b(v) => Ok(v),
31                    v => anyhow::bail!("cannot convert {:?} to {}", v, stringify!($a)),
32                }
33            }
34        }
35    )*)
36}
37
38from! {
39    String => String,
40    i32 => I32,
41    u32 => U32,
42    i64 => I64,
43    u64 => U64,
44    f32 => F32,
45    f64 => F64,
46}
47
48impl<'a> From<&'a str> for Value {
49    fn from(x: &'a str) -> Value {
50        x.to_string().into()
51    }
52}
53
54impl fmt::Display for Value {
55    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
56        match self {
57            Value::String(s) => s.fmt(f),
58            Value::I32(s) => s.fmt(f),
59            Value::U32(s) => s.fmt(f),
60            Value::I64(s) => s.fmt(f),
61            Value::U64(s) => s.fmt(f),
62            Value::F32(s) => s.fmt(f),
63            Value::F64(s) => s.fmt(f),
64        }
65    }
66}
wasmtime_interface_types/value.rs

wasmtime_interface_types/
value.rs
