fhirpathrs 0.1.0

Fhirpath implementation in Rust
Documentation 
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use serde_json::Value;

use crate::{
    evaluate::{EvaluateResult, Evaluate, Text},
    parser::invocation::IndexInvocation,
};

use super::resource_node::ResourceNode;

impl Evaluate for IndexInvocation {
    fn evaluate<'a, 'b>(&self, input: &'a ResourceNode<'a, 'b>) -> EvaluateResult<ResourceNode<'a, 'b>> {
        let index = input
            .get_index()
            .and_then(|index| Some(Value::Number(index.into())))
            .unwrap_or(Value::Array(vec![]));

        Ok(ResourceNode::from_node(input, index))
    }
}

impl Text for IndexInvocation {
    fn text(&self) -> EvaluateResult<String> {
        Ok(self.text.clone())
    }
}

#[cfg(test)]
mod test {
    use serde_json::json;

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

    #[test]
    fn test_index_path() {
        let patient = json!({ "resourceType": "Patient", "a": [6, 5, 4, 3, 2, 1] });

        let test_cases: Vec<TestCase> = vec![
            TestCase {
                path: "Patient.a.where($index > 0)".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!([5, 4, 3, 2, 1])),
                options: None,
            },
            TestCase {
                path: "Patient.a.select($index)".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!([0, 1, 2, 3, 4, 5])),
                options: None,
            },
            TestCase {
                path: "Patient.a.all($index < 7)".to_string(),
                input: patient.clone(),
                expected: Expected::Value(json!([true])),
                options: None,
            },
        ];

        run_tests(test_cases);
    }
}