fhirpathrs 0.1.0

Fhirpath implementation in Rust
Documentation 
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use crate::{
    evaluate::{EvaluateResult, Evaluate, Text},
    parser::expression::InvocationExpression,
};

use super::resource_node::ResourceNode;

impl Evaluate for InvocationExpression {
    fn evaluate<'a, 'b>(&self, input: &'a ResourceNode<'a, 'b>) -> EvaluateResult<ResourceNode<'a, 'b>> {
        self.children.iter().fold(Ok(input.clone()), |acc, child| {
            acc.and_then(|val| {
                let result = child.evaluate(&val);

                match result {
                    Ok(res) => {
                        let mut node = ResourceNode::from_node(input, res.data);

                        node.path = res.path.clone();
                        node.fhir_types = res.fhir_types.clone();

                        Ok(node)
                    }
                    Err(err) => Err(err),
                }
            })
        })
    }
}

impl Text for InvocationExpression {
    fn text(&self) -> EvaluateResult<String> {
        Ok(self
            .children
            .iter()
            .map(|c| c.text())
            .collect::<EvaluateResult<Vec<String>>>()?
            .join("."))
    }
}