sqlx-ledger-cel-interpreter 0.2.1

An interpreter for the Common Expression Language (CEL)
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

use chrono::{NaiveDate, Utc};

use std::rc::Rc;

use super::value::*;
use crate::error::*;

pub(crate) fn date(args: Vec<CelValue>) -> Result<CelValue, CelError> {
    if args.is_empty() {
        return Ok(CelValue::Date(Utc::now().date_naive()));
    }

    let s: Rc<String> = assert_arg(args.get(0))?;
    Ok(CelValue::Date(NaiveDate::parse_from_str(&s, "%Y-%m-%d")?))
}

pub(crate) fn uuid(args: Vec<CelValue>) -> Result<CelValue, CelError> {
    let s: Rc<String> = assert_arg(args.get(0))?;
    Ok(CelValue::Uuid(
        s.parse()
            .map_err(|e| CelError::UuidError(format!("{e:?}")))?,
    ))
}

fn assert_arg<'a, T: TryFrom<&'a CelValue, Error = CelError>>(
    arg: Option<&'a CelValue>,
) -> Result<T, CelError> {
    if let Some(v) = arg {
        T::try_from(v)
    } else {
        Err(CelError::MissingArgument)
    }
}