Crate hl7_2_from_json_into_er7 

Convert HL7 v2.5 messages from the typed JSON representation the sibling hl7-2-from-er7-into-json crate produces back to ER7 (pipe-delimited) encoding.

This is the inverse of that crate. It names every JSON key after either an HL7 v2.5 data type or a bare position, but in both cases the number after a key’s last dot is always the 1-based position at that level — field under a segment, component under a field, subcomponent under a component. Reconstruction leans on that one fact rather than an HL7 v2.5 data-type dictionary, so this crate carries none; see spec/index.md for the exact rules and their limits.

let json = r#"{
  "ORM_O01": {
    "MSH": { "MSH.1": "|", "MSH.2": "^~\\&", "MSH.9": {"MSG.1": "ORM", "MSG.2": "O01"} },
    "ORM_O01.PATIENT": {
      "PID": { "PID.5": { "XPN.1": {"FN.1": "TEST"}, "XPN.2": "FOUAZ" } }
    }
  }
}"#;
let er7 = hl7_2_from_json_into_er7::convert(json).unwrap();
assert!(er7.starts_with(r"MSH|^~\&|"));
assert!(er7.contains("PID|||||TEST^FOUAZ"));

Re-exports

pub use er7;

Modules

json

A minimal, dependency-free JSON reader (RFC 8259) for the documents this crate consumes.

reconstruct

Rebuilding the ER7 value tree from the parsed JSON Value tree.

Enums

Hl7Error

Errors that can occur while turning JSON into an er7::Message.

Functions

convert

Convert one JSON document to ER7 text, with default rendering: carriage-return segment terminators, and no trailing terminator.

convert_with_options

Convert one JSON document to ER7 text, choosing the segment terminator and whether the last segment gets one too — see er7::RenderOptions.

parse

Parse a converted-JSON document into an er7::Message, reconstructing its full ER7 value tree — segments, fields, repetitions, components, and subcomponents.