Crate helios_fhir 

FHIR Model Infrastructure

This module provides the foundational types and infrastructure that support the generated FHIR specification implementations. It contains hand-coded types that enable the generated code to handle FHIR’s complex requirements for precision, extensions, and cross-version compatibility.

Architecture

The FHIR crate is organized as follows:

• Generated modules (r4.rs, r4b.rs, r5.rs, r6.rs): Complete FHIR type implementations
• Infrastructure module (lib.rs): Foundational types used by generated code
• Test modules: Validation against official FHIR examples

Key Infrastructure Types

• PreciseDecimal - High-precision decimal arithmetic preserving original string format
• Element<T, Extension> - Base container for FHIR elements with extension support
• DecimalElement<Extension> - Specialized element for decimal values
• FhirVersion - Version enumeration for multi-version support

Usage Example

use helios_fhir::r4::{Patient, HumanName};
use helios_fhir::PreciseDecimal;
use rust_decimal::Decimal;

// Create a patient with precise decimal handling
let patient = Patient {
    name: Some(vec![HumanName {
        family: Some("Doe".to_string().into()),
        given: Some(vec!["John".to_string().into()]),
        ..Default::default()
    }]),
    ..Default::default()
};

// Work with precise decimals
let precise = PreciseDecimal::from(Decimal::new(12340, 3)); // 12.340

Re-exports

pub use parameters::ParameterValueAccessor;

pub use parameters::VersionIndependentParameters;

Modules

parameters

Version-independent FHIR Parameters resource wrapper

r4

FHIR R4 (4.0.1) - generated type definitions

r5

FHIR R5 (5.0.0) - generated type definitions

r6

FHIR R6 (current) - generated type definitions

r4b

FHIR R4B (4.3.0) - generated type definitions

Structs

DecimalElement

Specialized element container for FHIR decimal values with precision preservation.

Element

Generic element container supporting FHIR’s extension mechanism.

PreciseDecimal

High-precision decimal type that preserves original string representation.

PrecisionDate

Precision-aware FHIR Date type.

PrecisionDateTime

Precision-aware FHIR DateTime type.

PrecisionInstant

A FHIR instant value that preserves the original string representation and precision.

PrecisionTime

Precision-aware FHIR Time type.

Enums

DatePrecision

Precision levels for FHIR Date values.

DateTimePrecision

Precision levels for FHIR DateTime values.

FhirVersion

Enumeration of supported FHIR specification versions.

TimePrecision

Precision levels for FHIR Time values.

Traits

FhirComplexTypeProvider

Trait for providing FHIR complex type information

FhirResourceTypeProvider

Trait for providing FHIR resource type information

Functions

deserialize_forgiving_option

Custom deserializer that is more forgiving of null values in JSON.