Module constants 

Shared SoF v2 ViewDefinition.constant[] parsing.

Both the in-process FHIRPath evaluator (this crate’s crate::run_view_definition) and the in-DB SQL compiler in helios-persistence walk ViewDefinition.constant[] and interpret the same value[X] field family per the SoF v2 spec. This module is the single source of truth for that field list and primitive recognition, so a new primitive only needs to be added in one place.

Engines convert from ConstantValue into their own value types:

• helios-sof builds an EvaluationResult via ConstantValue::to_evaluation_result for the in-process FHIRPath evaluator. The four per-version ViewDefinitionConstantTrait impls in crate::traits map their typed ViewDefinitionConstantValue variants into ConstantValue and call this method.
• helios-persistence walks serde_json::Value and calls parse_constant_from_json, then lifts to its LitValue.

Enums

ConstantValue

Neutral SoF constant value covering every value[X] primitive family the SoF v2 spec allows for ViewDefinition.constant[].

Functions

parse_constant_from_json

Parses a raw JSON ViewDefinition.constant[] entry into (name, value).