wasm_wave/value/
func.rs

1use crate::wasm::WasmFunc;
2
3use super::{Type, WasmValueError};
4
5/// A FuncType represents the parameter and result type(s) of a Wasm func.
6#[derive(Clone, PartialEq)]
7pub struct FuncType {
8    params: Vec<(String, Type)>,
9    results: Vec<(String, Type)>,
10}
11
12impl FuncType {
13    /// Returns a new FuncType with the given param and result type(s).
14    /// Returns an error if the resulting func type would be invalid in the
15    /// component model, e.g. has any unnamed results with more than one
16    /// result type.
17    pub fn new(
18        params: impl Into<Vec<(String, Type)>>,
19        results: impl Into<Vec<(String, Type)>>,
20    ) -> Result<Self, WasmValueError> {
21        let params = params.into();
22        if params.iter().any(|(name, _)| name.is_empty()) {
23            return Err(WasmValueError::Other("func params must be named".into()));
24        }
25        let results = results.into();
26        if results.len() > 1 && results.iter().any(|(name, _)| name.is_empty()) {
27            return Err(WasmValueError::Other(
28                "funcs with more than one result must have all results named".into(),
29            ));
30        }
31        Ok(Self { params, results })
32    }
33}
34
35impl WasmFunc for FuncType {
36    type Type = Type;
37
38    fn params(&self) -> Box<dyn Iterator<Item = Self::Type> + '_> {
39        Box::new(self.params.iter().map(|(_, ty)| ty.clone()))
40    }
41
42    fn param_names(&self) -> Box<dyn Iterator<Item = std::borrow::Cow<'_, str>> + '_> {
43        Box::new(self.params.iter().map(|(name, _)| name.into()))
44    }
45
46    fn results(&self) -> Box<dyn Iterator<Item = Self::Type> + '_> {
47        Box::new(self.results.iter().map(|(_, ty)| ty.clone()))
48    }
49
50    fn result_names(&self) -> Box<dyn Iterator<Item = std::borrow::Cow<'_, str>> + '_> {
51        Box::new(
52            self.results
53                .iter()
54                .flat_map(|(name, _)| (!name.is_empty()).then_some(name.into())),
55        )
56    }
57}
58
59impl std::fmt::Display for FuncType {
60    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
61        crate::wasm::DisplayFunc(self.clone()).fmt(f)
62    }
63}
wasm_wave/value/func.rs

wasm_wave/value/
func.rs
