69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
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use crate::ctx::Context;
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use crate::dbs::Options;
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use crate::dbs::Transaction;
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use crate::err::Error;
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use crate::sql::comment::mightbespace;
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use crate::sql::error::IResult;
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use crate::sql::value::{value, Value};
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use nom::bytes::complete::tag;
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use nom::character::complete::char;
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use serde::{Deserialize, Serialize};
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use std::fmt;
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#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Hash)]
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pub struct Future(pub Value);
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impl Future {
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pub(crate) async fn compute(
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&self,
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ctx: &Context<'_>,
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opt: &Options,
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txn: &Transaction,
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doc: Option<&Value>,
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) -> Result<Value, Error> {
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// Prevent long future chains
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let opt = &opt.dive(1)?;
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// Process the future if enabled
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match opt.futures {
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true => self.0.compute(ctx, opt, txn, doc).await?.ok(),
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false => Ok(self.clone().into()),
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}
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}
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}
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impl fmt::Display for Future {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "<future> {{ {} }}", self.0)
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}
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}
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pub fn future(i: &str) -> IResult<&str, Future> {
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let (i, _) = char('<')(i)?;
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let (i, _) = tag("future")(i)?;
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let (i, _) = char('>')(i)?;
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let (i, _) = mightbespace(i)?;
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let (i, _) = char('{')(i)?;
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let (i, _) = mightbespace(i)?;
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let (i, v) = value(i)?;
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let (i, _) = mightbespace(i)?;
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let (i, _) = char('}')(i)?;
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Ok((i, Future(v)))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::sql::expression::Expression;
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use crate::sql::test::Parse;
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#[test]
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fn future_expression() {
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let sql = "<future> { 1.2345 + 5.4321 }";
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let res = future(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("<future> { 1.2345 + 5.4321 }", format!("{}", out));
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assert_eq!(out, Future(Value::from(Expression::parse("1.2345 + 5.4321"))));
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}
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}
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