rsql_rs/ast/
comparison.rs

1use crate::error::ParserError;
2use crate::ParserResult;
3use regex::RegexSet;
4use serde::{Deserialize, Serialize};
5
6lazy_static! {
7    static ref COMP_OP_RE: RegexSet = RegexSet::new(&[r"^=[a-zA-Z]*=$", r"^[<>]=?$"]).unwrap();
8    pub static ref EQUAL: Comparison = Comparison::new(&["=="], false).unwrap();
9    pub static ref NOT_EQUAL: Comparison = Comparison::new(&["!="], false).unwrap();
10    pub static ref GREATER_THAN: Comparison = Comparison::new(&[">", "=gt="], false).unwrap();
11    pub static ref GREATER_THAN_OR_EQUAL: Comparison =
12        Comparison::new(&[">=", "=ge="], false).unwrap();
13    pub static ref LESS_THAN: Comparison = Comparison::new(&["<", "=lt="], false).unwrap();
14    pub static ref LESS_THAN_OR_EQUAL: Comparison =
15        Comparison::new(&["<=", "=le="], false).unwrap();
16    pub static ref IN: Comparison = Comparison::new(&["=in="], true).unwrap();
17    pub static ref OUT: Comparison = Comparison::new(&["=out="], true).unwrap();
18}
19
20#[derive(Debug, PartialEq, Eq, Clone, Hash, Serialize, Deserialize)]
21pub struct Comparison {
22    pub symbols: Vec<String>,
23    pub multi_values: bool,
24}
25
26impl Comparison {
27    pub fn new(symbols: &[&str], multi_values: bool) -> ParserResult<Comparison> {
28        let symbols = symbols
29            .iter()
30            .map(|&sym| Self::is_valid_symbol(sym))
31            .collect::<ParserResult<Vec<String>>>()?;
32        Ok(Comparison { symbols, multi_values })
33    }
34
35    fn is_valid_symbol(symbol: &str) -> ParserResult<String> {
36        if COMP_OP_RE.is_match(symbol) || symbol == "!=" {
37            Ok(symbol.to_string())
38        } else {
39            Err(ParserError::InvalidComparison(symbol.to_string()))
40        }
41    }
42}
43
44#[cfg(test)]
45mod tests {
46    use crate::ast::comparison::*;
47
48    #[test]
49    fn test_valid() -> anyhow::Result<()> {
50        let symbols = vec!["==", "=eq="];
51        Comparison::new(&symbols, false)?;
52
53        Ok(())
54    }
55
56    #[test]
57    fn test_invalid() -> anyhow::Result<()> {
58        assert!(Comparison::new(&["~="], false).is_err());
59        assert!(Comparison::new(&["><="], false).is_err());
60        assert!(Comparison::new(&["test="], false).is_err());
61        Ok(())
62    }
63}
rsql_rs/ast/comparison.rs

rsql_rs/ast/
comparison.rs
