102 lines
2.5 KiB
Rust
102 lines
2.5 KiB
Rust
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use crate::sql::comment::shouldbespace;
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use crate::sql::cond::{cond, Cond};
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use crate::sql::field::{fields, Fields};
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use crate::sql::group::{group, Groups};
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use crate::sql::table::{tables, Tables};
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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::preceded;
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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 View {
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pub expr: Fields,
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pub what: Tables,
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#[serde(skip_serializing_if = "Option::is_none")]
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pub cond: Option<Cond>,
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#[serde(skip_serializing_if = "Option::is_none")]
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pub group: Option<Groups>,
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}
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impl fmt::Display for View {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "AS SELECT {} FROM {}", self.expr, self.what)?;
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if let Some(ref v) = self.cond {
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write!(f, " {}", v)?
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}
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if let Some(ref v) = self.group {
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write!(f, " {}", v)?
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}
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Ok(())
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}
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}
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pub fn view(i: &str) -> IResult<&str, View> {
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let (i, _) = tag_no_case("AS")(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, _) = opt(tag_no_case("("))(i)?;
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let (i, _) = tag_no_case("SELECT")(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, expr) = fields(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, _) = tag_no_case("FROM")(i)?;
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let (i, _) = shouldbespace(i)?;
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let (i, what) = tables(i)?;
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let (i, cond) = opt(preceded(shouldbespace, cond))(i)?;
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let (i, group) = opt(preceded(shouldbespace, group))(i)?;
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let (i, _) = opt(tag_no_case(")"))(i)?;
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Ok((
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i,
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View {
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expr,
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what,
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cond,
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group,
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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 view_simple() {
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let sql = "AS SELECT * FROM test";
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let res = view(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("AS SELECT * FROM test", format!("{}", out))
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}
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#[test]
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fn view_brackets() {
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let sql = "AS (SELECT * FROM test)";
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let res = view(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("AS SELECT * FROM test", format!("{}", out))
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}
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#[test]
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fn view_brackets_where() {
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let sql = "AS (SELECT temp FROM test WHERE temp IS NOT EMPTY)";
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let res = view(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("AS SELECT temp FROM test WHERE temp != EMPTY", format!("{}", out))
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}
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#[test]
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fn view_brackets_group() {
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let sql = "AS (SELECT temp FROM test WHERE temp IS NOT EMPTY GROUP BY temp)";
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let res = view(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("AS SELECT temp FROM test WHERE temp != EMPTY GROUP BY temp", format!("{}", out))
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}
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}
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