53 lines
1.2 KiB
Rust
53 lines
1.2 KiB
Rust
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use crate::sql::comment::shouldbespace;
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use crate::sql::error::IResult;
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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 Explain(pub bool);
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impl fmt::Display for Explain {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.write_str("EXPLAIN")?;
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if self.0 {
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f.write_str(" FULL")?;
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}
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Ok(())
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}
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}
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pub fn explain(i: &str) -> IResult<&str, Explain> {
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let (i, _) = tag_no_case("EXPLAIN")(i)?;
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let (i, full) = opt(tuple((shouldbespace, tag_no_case("FULL"))))(i)?;
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Ok((i, Explain(full.is_some())))
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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 explain_statement() {
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let sql = "EXPLAIN";
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let res = explain(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, Explain(false));
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assert_eq!("EXPLAIN", format!("{}", out));
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}
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#[test]
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fn explain_full_statement() {
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let sql = "EXPLAIN FULL";
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let res = explain(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, Explain(true));
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assert_eq!("EXPLAIN FULL", format!("{}", out));
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}
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}
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