117 lines
2.8 KiB
Rust
117 lines
2.8 KiB
Rust
use crate::sql::comment::shouldbespace;
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use crate::sql::common::commas;
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use crate::sql::error::IResult;
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use crate::sql::fmt::Fmt;
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use crate::sql::idiom::{basic, Idiom};
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use nom::branch::alt;
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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_list1;
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use nom::sequence::tuple;
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use serde::{Deserialize, Serialize};
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use std::fmt::{self, Display, Formatter};
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use std::ops::Deref;
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#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Hash)]
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pub struct Groups(pub Vec<Group>);
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impl Deref for Groups {
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type Target = Vec<Group>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl IntoIterator for Groups {
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type Item = Group;
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type IntoIter = std::vec::IntoIter<Self::Item>;
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fn into_iter(self) -> Self::IntoIter {
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self.0.into_iter()
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}
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}
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impl Display for Groups {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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write!(f, "GROUP BY {}", Fmt::comma_separated(&self.0))
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}
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}
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#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Hash)]
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pub struct Group(pub Idiom);
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impl Deref for Group {
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type Target = Idiom;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl Display for Group {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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Display::fmt(&self.0, f)
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}
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}
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pub fn group(i: &str) -> IResult<&str, Groups> {
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alt((group_all, group_any))(i)
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}
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fn group_all(i: &str) -> IResult<&str, Groups> {
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let (i, _) = tag_no_case("GROUP")(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, _) = tag_no_case("ALL")(i)?;
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Ok((i, Groups(vec![])))
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}
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fn group_any(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_list1(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) = basic(i)?;
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Ok((i, Group(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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use crate::sql::test::Parse;
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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!(out, Groups(vec![Group(Idiom::parse("field"))]));
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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!(out, Groups(vec![Group(Idiom::parse("field"))]));
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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![Group(Idiom::parse("field")), Group(Idiom::parse("other.field"))])
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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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