51 lines
1.2 KiB
Rust
51 lines
1.2 KiB
Rust
use crate::sql::comment::shouldbespace;
|
|
use crate::sql::common::take_usize;
|
|
use crate::sql::error::IResult;
|
|
use nom::bytes::complete::tag_no_case;
|
|
use nom::combinator::opt;
|
|
use nom::sequence::tuple;
|
|
use serde::{Deserialize, Serialize};
|
|
use std::fmt;
|
|
|
|
#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize)]
|
|
pub struct Limit(pub usize);
|
|
|
|
impl fmt::Display for Limit {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
write!(f, "LIMIT {}", self.0)
|
|
}
|
|
}
|
|
|
|
pub fn limit(i: &str) -> IResult<&str, Limit> {
|
|
let (i, _) = tag_no_case("LIMIT")(i)?;
|
|
let (i, _) = opt(tuple((shouldbespace, tag_no_case("BY"))))(i)?;
|
|
let (i, _) = shouldbespace(i)?;
|
|
let (i, v) = take_usize(i)?;
|
|
Ok((i, Limit(v)))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn limit_statement() {
|
|
let sql = "LIMIT 100";
|
|
let res = limit(sql);
|
|
assert!(res.is_ok());
|
|
let out = res.unwrap().1;
|
|
assert_eq!(out, Limit(100));
|
|
assert_eq!("LIMIT 100", format!("{}", out));
|
|
}
|
|
|
|
#[test]
|
|
fn limit_statement_by() {
|
|
let sql = "LIMIT BY 100";
|
|
let res = limit(sql);
|
|
assert!(res.is_ok());
|
|
let out = res.unwrap().1;
|
|
assert_eq!(out, Limit(100));
|
|
assert_eq!("LIMIT 100", format!("{}", out));
|
|
}
|
|
}
|