mirror of
https://github.com/meilisearch/meilisearch.git
synced 2024-11-27 04:25:06 +08:00
71 lines
2.4 KiB
Rust
71 lines
2.4 KiB
Rust
//! BNF grammar:
|
|
//!
|
|
//! ```text
|
|
//! condition = value ("==" | ">" ...) value
|
|
//! to = value value TO value
|
|
//! ```
|
|
|
|
use nom::branch::alt;
|
|
use nom::bytes::complete::tag;
|
|
use nom::character::complete::multispace1;
|
|
use nom::combinator::cut;
|
|
use nom::sequence::{terminated, tuple};
|
|
use Condition::*;
|
|
|
|
use crate::{parse_value, FilterCondition, IResult, Span, Token};
|
|
|
|
#[derive(Debug, Clone, PartialEq, Eq)]
|
|
pub enum Condition<'a> {
|
|
GreaterThan(Token<'a>),
|
|
GreaterThanOrEqual(Token<'a>),
|
|
Equal(Token<'a>),
|
|
NotEqual(Token<'a>),
|
|
Exists,
|
|
LowerThan(Token<'a>),
|
|
LowerThanOrEqual(Token<'a>),
|
|
Between { from: Token<'a>, to: Token<'a> },
|
|
}
|
|
|
|
/// condition = value ("==" | ">" ...) value
|
|
pub fn parse_condition(input: Span) -> IResult<FilterCondition> {
|
|
let operator = alt((tag("<="), tag(">="), tag("!="), tag("<"), tag(">"), tag("=")));
|
|
let (input, (fid, op, value)) = tuple((parse_value, operator, cut(parse_value)))(input)?;
|
|
|
|
let condition = match *op.fragment() {
|
|
"<=" => FilterCondition::Condition { fid, op: LowerThanOrEqual(value) },
|
|
">=" => FilterCondition::Condition { fid, op: GreaterThanOrEqual(value) },
|
|
"!=" => FilterCondition::Condition { fid, op: NotEqual(value) },
|
|
"<" => FilterCondition::Condition { fid, op: LowerThan(value) },
|
|
">" => FilterCondition::Condition { fid, op: GreaterThan(value) },
|
|
"=" => FilterCondition::Condition { fid, op: Equal(value) },
|
|
_ => unreachable!(),
|
|
};
|
|
|
|
Ok((input, condition))
|
|
}
|
|
|
|
/// exist = value "EXISTS"
|
|
pub fn parse_exists(input: Span) -> IResult<FilterCondition> {
|
|
let (input, key) = terminated(parse_value, tag("EXISTS"))(input)?;
|
|
|
|
Ok((input, FilterCondition::Condition { fid: key.into(), op: Exists }))
|
|
}
|
|
/// exist = value "NOT" WS+ "EXISTS"
|
|
pub fn parse_not_exists(input: Span) -> IResult<FilterCondition> {
|
|
let (input, key) = parse_value(input)?;
|
|
|
|
let (input, _) = tuple((tag("NOT"), multispace1, tag("EXISTS")))(input)?;
|
|
Ok((
|
|
input,
|
|
FilterCondition::Not(Box::new(FilterCondition::Condition { fid: key.into(), op: Exists })),
|
|
))
|
|
}
|
|
|
|
/// to = value value "TO" WS+ value
|
|
pub fn parse_to(input: Span) -> IResult<FilterCondition> {
|
|
let (input, (key, from, _, _, to)) =
|
|
tuple((parse_value, parse_value, tag("TO"), multispace1, cut(parse_value)))(input)?;
|
|
|
|
Ok((input, FilterCondition::Condition { fid: key, op: Between { from, to } }))
|
|
}
|