51 lines
1.2 KiB
Rust
51 lines
1.2 KiB
Rust
use crate::sql::comment::shouldbespace;
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use crate::sql::common::take_u64;
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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 nom::IResult;
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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)]
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pub struct Limit(pub u64);
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impl fmt::Display for Limit {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "LIMIT {}", self.0)
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}
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}
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pub fn limit(i: &str) -> IResult<&str, Limit> {
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let (i, _) = tag_no_case("LIMIT")(i)?;
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let (i, _) = opt(tuple((shouldbespace, tag_no_case("BY"))))(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, v) = take_u64(i)?;
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Ok((i, Limit(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 limit_statement() {
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let sql = "LIMIT 100";
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let res = limit(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, Limit(100));
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assert_eq!("LIMIT 100", format!("{}", out));
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}
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#[test]
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fn limit_statement_by() {
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let sql = "LIMIT BY 100";
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let res = limit(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, Limit(100));
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assert_eq!("LIMIT 100", format!("{}", out));
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}
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}
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