zerodds-sql-filter

OMG DDS 1.4 §B.2.1 ContentFilteredTopic filter-expression parser + evaluator for the ZeroDDS stack. Pure-Rust + alloc. Safety classification: SAFE.

Spec-Mapping

Was ist drin

• parse(input), Expr (And/Or/Not/Cmp/Between), CmpOp, Operand, Value.
• RowAccess-Trait + Expr::evaluate(row, params).
• ParseError, EvalError.

Spec coverage (§B.2.1 full)

• Literale: String/Int/Float/Bool.
• Identifier: dotted (a.b.c).
• Parameter %0, %1, …
• Vergleichs-Ops: =, !=/<>, <, <=, >, >=, LIKE.
• Boolean: AND, OR, NOT.
• BETWEEN low AND high + NOT BETWEEN low AND high.
• Klammern.
• LIKE-Wildcards: %, _.

Schichten-Position

Layer 4. Pure-Rust + alloc, no ZeroDDS crate deps.

Quickstart

use zerodds_sql_filter::{parse, Value, RowAccess};
use std::collections::HashMap;

struct MapRow(HashMap<String, Value>);
impl RowAccess for MapRow {
    fn get(&self, path: &str) -> Option<Value> { self.0.get(path).cloned() }
}

let expr = parse("color = %0 AND x BETWEEN 0 AND 100").unwrap();
let row = MapRow(HashMap::from([
    ("color".into(), Value::String("RED".into())),
    ("x".into(),     Value::Int(42)),
]));
assert_eq!(expr.evaluate(&row, &[Value::String("RED".into())]), Ok(true));

Stabilitaet

1.0.0-rc.1. Public-API + Filter-Expression-Grammar RC1-stabil.

Tests

cargo test -p zerodds-sql-filter

27 + 1 doc test green.

License

Apache-2.0.