tinywasm_cli/
value_parse.rs

1use eyre::{Result, bail};
2use tinywasm::types::{FuncType, WasmType, WasmValue};
3
4use crate::output::format_wasm_type;
5
6pub fn parse_invocation_args(ty: &FuncType, args: &[String]) -> Result<Vec<WasmValue>> {
7    if args.len() != ty.params().len() {
8        bail!("wrong number of arguments: expected {}, got {}", ty.params().len(), args.len())
9    }
10
11    ty.params().iter().enumerate().map(|(idx, param_ty)| parse_arg(idx, *param_ty, &args[idx])).collect()
12}
13
14fn parse_arg(index: usize, ty: WasmType, value: &str) -> Result<WasmValue> {
15    let parsed = match ty {
16        WasmType::I32 => value.parse::<i32>().map(WasmValue::from).map_err(|e| format_error(index, ty, value, e))?,
17        WasmType::I64 => value.parse::<i64>().map(WasmValue::from).map_err(|e| format_error(index, ty, value, e))?,
18        WasmType::F32 => value.parse::<f32>().map(WasmValue::from).map_err(|e| format_error(index, ty, value, e))?,
19        WasmType::F64 => value.parse::<f64>().map(WasmValue::from).map_err(|e| format_error(index, ty, value, e))?,
20        WasmType::V128 => value.parse::<i128>().map(WasmValue::from).map_err(|e| format_error(index, ty, value, e))?,
21        WasmType::RefFunc | WasmType::RefExtern => {
22            bail!(
23                "unsupported CLI argument type at position {}: {}; use the embedding API for reference values",
24                index + 1,
25                format_wasm_type(ty)
26            )
27        }
28    };
29
30    Ok(parsed)
31}
32
33fn format_error(index: usize, ty: WasmType, value: &str, error: impl core::fmt::Display) -> eyre::Report {
34    eyre::eyre!("failed to parse argument {} as {} from `{value}`: {error}", index + 1, format_wasm_type(ty))
35}
36
37#[cfg(test)]
38mod tests {
39    use super::*;
40
41    #[test]
42    fn parses_numeric_args() {
43        let ty = FuncType::new(&[WasmType::I32, WasmType::F64], &[WasmType::I32]);
44        let args = vec!["1".to_string(), "2.5".to_string()];
45        let parsed = parse_invocation_args(&ty, &args).unwrap();
46        assert_eq!(parsed, vec![WasmValue::I32(1), WasmValue::F64(2.5)]);
47    }
48
49    #[test]
50    fn rejects_wrong_arity() {
51        let ty = FuncType::new(&[WasmType::I32], &[]);
52        let err = parse_invocation_args(&ty, &[]).unwrap_err();
53        assert!(err.to_string().contains("wrong number of arguments"));
54    }
55}
tinywasm_cli/value_parse.rs

tinywasm_cli/
value_parse.rs
