109 lines
2.2 KiB
Rust
109 lines
2.2 KiB
Rust
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use crate::sql::comment::shouldbespace;
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use crate::sql::common::commas;
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use crate::sql::idiom::{idiom, Idiom};
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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::multi::separated_nonempty_list;
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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, Hash, PartialEq, Serialize, Deserialize)]
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pub struct Groups(Vec<Group>);
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impl fmt::Display for Groups {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(
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f,
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"GROUP BY {}",
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self.0.iter().map(|ref v| format!("{}", v)).collect::<Vec<_>>().join(", ")
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)
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}
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}
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#[derive(Clone, Debug, Default, Eq, Hash, PartialEq, Serialize, Deserialize)]
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pub struct Group {
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pub group: Idiom,
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}
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impl fmt::Display for Group {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.group)
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}
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}
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pub fn group(i: &str) -> IResult<&str, Groups> {
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let (i, _) = tag_no_case("GROUP")(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) = separated_nonempty_list(commas, group_raw)(i)?;
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Ok((i, Groups(v)))
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}
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fn group_raw(i: &str) -> IResult<&str, Group> {
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let (i, v) = idiom(i)?;
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Ok((
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i,
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Group {
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group: v,
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},
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))
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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 group_statement() {
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let sql = "GROUP field";
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let res = group(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!(
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out,
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Groups(vec![Group {
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group: Idiom::from("field")
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}])
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);
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assert_eq!("GROUP BY field", format!("{}", out));
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}
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#[test]
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fn group_statement_by() {
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let sql = "GROUP BY field";
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let res = group(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!(
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out,
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Groups(vec![Group {
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group: Idiom::from("field")
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}])
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);
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assert_eq!("GROUP BY field", format!("{}", out));
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}
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#[test]
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fn group_statement_multiple() {
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let sql = "GROUP field, other.field";
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let res = group(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!(
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out,
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Groups(vec![
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Group {
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group: Idiom::from("field")
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},
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Group {
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group: Idiom::from("other.field")
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},
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])
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);
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assert_eq!("GROUP BY field, other.field", format!("{}", out));
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}
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}
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