smat-stream

js-smat-parser

Given a SMAT msg file and associated idx file, parses the hl7 messages in a stream.

This stream reads the file in reverse order from end to beginning, so as to return messages in order of most recent to least.

NOTE: There must be both an .idx and .msg file with the same name (except the file extension) in the same directory for this to work

Usage

const SMATStream = require("smat-stream");

const stream = new SMATStream({
  filename: "cpcs_lsu_adt.live_abs.abs_mt_out_out.02252020" // for example
})

stream.on("data", chunk => {
  console.log(chunk); // { meta: {...}, rawMessage: "..." } 
})

Data Chunks

Each data chunk represents a single hl7 message and its .idx file entry.

The two fields in each chunk are:

• meta: An object containing info from the .idx file
• rawMessage: the HL7 message as a raw string

So Meta

The meta object has the following fields

• MID: message id broken into
  • DOMAIN
  • HUB
  • NUM
• SRCMID
  • DOMAIN
  • HUB
  • NUM
• TYPE
• SOURCECONN
• ORIGSOURCECONN
• DESTCONN
• TIME
• PRIORITY
• DATAFMT
• SAVECONTEXT
• OFFSET: the byte offset of the start of the message in the .msg file
• LENGTH: the number of bytes in the message
• FLAGS
• STATE
• GROUPMID
  • DOMAIN
  • HUB
  • NUM
• XLTTHREAD
• RETRIES
• SKIPXLT
• USERECOVERDB
• GROUPID
• TIMEIN
• TIMEXLT
• TIMEOUT
• TIMEQCUR
• TIMEQTOT
• TIMEREC
• TIMESTOR
• TIMEARC
• DBTABLE
• SEPCHARS
• DRIVERCTL
• USERDATA

TCL Keyed List Grammar

NOTE: TCL Keyed Lists are just lists of lists with 2 elements representing key/value pairs

list        -> LCB value* RCB

value       -> ID | NUMBER | list