hamelin_eval 0.7.9

Expression evaluation for Hamelin query language
Documentation 
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//! Eval implementations for membership operators

use hamelin_lib::func::defs::{NumericRange, TimestampRange};

use crate::registry::EvalRegistry;
use crate::value::{RangeValue, Value};

/// Register all membership operator eval implementations.
pub fn register(registry: &mut EvalRegistry) {
    // NumericRange: left..right -> Range(left, right)
    registry.register_eval::<NumericRange>(|mut bindings| {
        let left = bindings.take()?;
        let right = bindings.take()?;
        Ok(Value::Range(Box::new(RangeValue {
            lower: Some(left),
            upper: Some(right),
        })))
    });

    // TimestampRange: left..right -> Range(left, right)
    registry.register_eval::<TimestampRange>(|mut bindings| {
        let left = bindings.take()?;
        let right = bindings.take()?;
        Ok(Value::Range(Box::new(RangeValue {
            lower: Some(left),
            upper: Some(right),
        })))
    });

    // No reverse eval for membership operators - they're not invertible
}