knotty pumice
Hi, i am trying parse text with crate nom (and anyhow for errors), and i have method check and function parse, method has test_str parametrs and execute function with test_str as parameter, function parse return IResult<&str, Vec<(&str, Vec<&str>)>>, method take &str and Vec<(...)> as variable from returned IResult, so, if i use ? operator on executed function i have this error:
error[E0521]: borrowed data escapes outside of associated function
--> src/decoder.rs:99:24
|
98 | fn check(&self, test_str: &str) -> Result<()> {
| ---- - let's call the lifetime of this reference `'1`
| |
| `test_str` is a reference that is only valid in the associated function body
99 | let (s, vec) = Decoder::parse(test_str)?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| `test_str` escapes the associated function body here
| argument requires that `'1` must outlive `'static`
but if I replace ? operator with .unwrap(), program is compiling successful.
Does anyone have any tips to help me with this problem?
My code:
check method, compile error:
fn check(&self, test_str: &str) -> Result<()> {
let (s, vec) = Decoder::parse(test_str)?;
println!("{:#?}", vec);
Ok(())
}
check method, compile successful:
fn check(&self, test_str: &str) -> Result<()> {
let (s, vec) = Decoder::parse(test_str).unwrap();
println!("{:#?}", vec);
Ok(())
}
parse function:
fn parse(data: &str) -> IResult<&str, Vec<(&str, Vec<&str>)>> {
let (data, _) = tag("xyz ")(data)?;
separated_list1(
tag(", "),
separated_pair(
take_while1(|c: char| c.is_alphabetic() || c == '_'),
tag(": "),
separated_list1(
tag(" "),
take_while1(|c: char| c.is_alphabetic() || c == '_'),
),
),
)(data)
}
vestal wren