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Enable ? operator in graph traversal queries

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This commit is contained in:
Tobie Morgan Hitchcock 2022-05-31 21:30:56 +01:00
parent 4d9b3fd403
commit bea90712a3
2 changed files with 24 additions and 4 deletions
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21
lib/src/sql/graph.rs
View file

@ -7,6 +7,7 @@ use crate::sql::value::{value, Value};
use nom::branch::alt;
use nom::bytes::complete::tag_no_case;
use nom::character::complete::char;
use nom::combinator::map;
use nom::combinator::opt;
use serde::{Deserialize, Serialize};
use std::fmt;
@ -44,10 +45,18 @@ pub struct Graph {
impl fmt::Display for Graph {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.what.0.len() == 1 && self.cond.is_none() && self.alias.is_none() {
write!(f, "{}{}", self.dir, self.what)
if self.what.0.len() <= 1 && self.cond.is_none() && self.alias.is_none() {
write!(f, "{}", self.dir,)?;
match self.what.len() {
0 => write!(f, "?"),
_ => write!(f, "{}", self.what),
}
} else {
write!(f, "{}({}", self.dir, self.what)?;
write!(f, "{}(", self.dir,)?;
match self.what.len() {
0 => write!(f, "?"),
_ => write!(f, "{}", self.what),
}?;
if let Some(ref v) = self.cond {
write!(f, " WHERE {}", v)?
}
@ -126,10 +135,14 @@ fn custom(i: &str) -> IResult<&str, (Tables, Option<Value>, Option<Idiom>)> {
}
fn what(i: &str) -> IResult<&str, Tables> {
let (i, v) = tables(i)?;
let (i, v) = alt((any, tables))(i)?;
Ok((i, v))
}
fn any(i: &str) -> IResult<&str, Tables> {
map(char('?'), |_| Tables::default())(i)
}
fn cond(i: &str) -> IResult<&str, Value> {
let (i, _) = shouldbespace(i)?;
let (i, _) = tag_no_case("WHERE")(i)?;

7
lib/src/sql/table.rs
View file

@ -13,6 +13,13 @@ use std::str;
#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize)]
pub struct Tables(pub Vec<Table>);
impl Deref for Tables {
type Target = Vec<Table>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl fmt::Display for Tables {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0.iter().map(|ref v| format!("{}", v)).collect::<Vec<_>>().join(", "))