73 lines
1.7 KiB
Rust
73 lines
1.7 KiB
Rust
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::shouldbespace;
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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_no_case;
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use nom::combinator::opt;
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use nom::sequence::tuple;
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use serde::{Deserialize, Serialize};
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use std::fmt;
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#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Hash)]
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pub struct Start(pub Value);
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impl Start {
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pub(crate) async fn process(
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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<usize, Error> {
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match self.0.compute(ctx, opt, txn, doc).await {
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Ok(v) if v.is_integer() && v.is_zero_or_positive() => Ok(v.as_usize()),
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Ok(v) => Err(Error::InvalidStart {
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value: v.as_string(),
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}),
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Err(e) => Err(e),
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}
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}
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}
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impl fmt::Display for Start {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "START {}", self.0)
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}
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}
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pub fn start(i: &str) -> IResult<&str, Start> {
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let (i, _) = tag_no_case("START")(i)?;
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let (i, _) = opt(tuple((shouldbespace, tag_no_case("AT"))))(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, v) = value(i)?;
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Ok((i, Start(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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#[test]
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fn start_statement() {
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let sql = "START 100";
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let res = start(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!(out, Start(Value::from(100)));
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assert_eq!("START 100", format!("{}", out));
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}
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#[test]
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fn start_statement_at() {
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let sql = "START AT 100";
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let res = start(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!(out, Start(Value::from(100)));
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assert_eq!("START 100", format!("{}", out));
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}
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}
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