fhirpathrs 0.1.1

Fhirpath implementation in Rust
Documentation 
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use serde_json::Value;

use crate::parser::expression::Expression;

use super::{nodes::resource_node::ResourceNode, EvaluateResult};

pub fn now<'a, 'b>(
    input: &'a ResourceNode<'a, 'b>,
    _expressions: &Vec<Box<Expression>>,
) -> EvaluateResult<ResourceNode<'a, 'b>> {
    Ok(ResourceNode::from_node(
        input,
        Value::String(
            input
                .context
                .now
                .format("%Y-%m-%dT%H:%M:%S.%3f%:z")
                .to_string(),
        ),
    ))
}

pub fn today<'a, 'b>(
    input: &'a ResourceNode<'a, 'b>,
    _expressions: &Vec<Box<Expression>>,
) -> EvaluateResult<ResourceNode<'a, 'b>> {
    Ok(ResourceNode::from_node(
        input,
        Value::String(input.context.now.format("%Y-%m-%d").to_string()),
    ))
}

pub fn time_of_day<'a, 'b>(
    input: &'a ResourceNode<'a, 'b>,
    _expressions: &Vec<Box<Expression>>,
) -> EvaluateResult<ResourceNode<'a, 'b>> {
    Ok(ResourceNode::from_node(
        input,
        Value::String(input.context.now.format("%H:%M:%S.%3f").to_string()),
    ))
}

#[cfg(test)]
mod test {
    use std::str::FromStr;

    use chrono::DateTime;
    use serde_json::json;

    use crate::evaluate::{
        test::test::{run_tests, TestCase},
        EvaluateOptions,
    };
    use crate::evaluate::test::test::Expected;

    #[test]
    fn evaluate_now_path() {
        let patient = json!({
            "resourceType": "Patient",
            "a": 2,
            "b": 6
        });

        let test_datetime = DateTime::from_str("2025-04-13T23:00:00.000+00:00").unwrap();

        let test_cases: Vec<TestCase> = vec![
            TestCase {
                path: "now() = now()".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!([true])),
                options: None,
            },
            TestCase {
                path: "now()".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!(["2025-04-13T23:00:00.000+00:00"])),
                options: Some(EvaluateOptions {
                    now: Some(test_datetime),
                    model: None,
                    vars: None,
                    trace_function: None,
                }),
            },
            TestCase {
                path: "now() = @2025-04-13T23:00:00.000+00:00".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!([true])),
                options: Some(EvaluateOptions {
                    now: Some(test_datetime),
                    model: None,
                    vars: None,
                    trace_function: None,
                }),
            },
        ];

        run_tests(test_cases);
    }

    #[test]
    fn evaluate_today_path() {
        let patient = json!({
            "resourceType": "Patient",
            "a": 2,
            "b": 6
        });

        let test_datetime = DateTime::from_str("2025-04-13T23:00:00.000+00:00").unwrap();

        let test_cases: Vec<TestCase> = vec![
            TestCase {
                path: "today()".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!(["2025-04-13"])),
                options: Some(EvaluateOptions {
                    now: Some(test_datetime),
                    model: None,
                    vars: None,
                    trace_function: None,
                }),
            },
            TestCase {
                path: "today() = @2025-04-13".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!([true])),
                options: Some(EvaluateOptions {
                    now: Some(test_datetime),
                    model: None,
                    vars: None,
                    trace_function: None,
                }),
            },
        ];

        run_tests(test_cases);
    }

    #[test]
    fn evaluate_time_of_day_path() {
        let patient = json!({
            "resourceType": "Patient",
            "a": 2,
            "b": 6
        });

        let test_datetime = DateTime::from_str("2025-04-13T23:00:00.000+00:00").unwrap();

        let test_cases: Vec<TestCase> = vec![
            TestCase {
                path: "timeOfDay()".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!(["23:00:00.000"])),
                options: Some(EvaluateOptions {
                    now: Some(test_datetime),
                    model: None,
                    vars: None,
                    trace_function: None,
                }),
            },
            // @todo - test should pass but doesn't, related to time equality
            // TestCase {
            //     path: "timeOfDay() = @T23:00:00.000".to_string(),
            //     input: patient.clone(),
            //     expected: Expected::Value(json!([true])),
            //     options: Some(EvaluateOptions {
            //         now: Some(test_datetime),
            //         model: None,
            //         vars: None,
            //         trace_function: None,
            //     }),
            // },
        ];

        run_tests(test_cases);
    }
}