21. class Maps2004Compiler: Compiler for MAPS 2004 protocol

21. `class Maps2004Compiler`: Compiler for MAPS 2004 protocol

Compared to the MAPS 2006 protocol, compiling the MAPS 2004 protocol has these differences:

Instead of the current free-field tail section that follows the alignment character, this compiler uses the old fixed-field “short tail” and “long tail” formats. Even the alignment character is affected; it may be “*” to signify feather-pulled.
The output record lacks the cloacal swab field at the very end.

Inheritance handles both these variations. We use the inherited mechanism until the scanEncounter() method, at which point we replace that method with that instantiates a Maps2004Encounter record instead of the inherited Maps2006Encounter record. The Maps2004Encounter class takes care of both the differences in input scanning, and the different output format.

baseclasses.py

# - - - - -   c l a s s   M a p s 2 0 0 4 C o m p i l e r   - - - - -

class Maps2004Compiler(Maps2006Compiler):
    '''Compiler logic for the MAPS 2004 protocol.

      Exports:  As inherited.
    '''

21.1. `Maps2004Compiler.scanEncounter()`

This method is identical to the same method in Maps2006Compiler except that it uses the Maps2004Encounter class instead of the Maps2006Encounter class.

baseclasses.py

# - - -   M a p s 2 0 0 4 C o m p i l e r . s c a n E n c o u n t e r

    def scanEncounter(self):
        '''Process an encounter line.
        '''

See Section 76, “class Maps2004Encounter” and Section 74.6, “BaseEncounter.scanLine(): Scan a raw encounter record”.

baseclasses.py

        #-- 1 --
        # [ if the line in self.scan is a valid MAPS 2004
        #   encounter line ->
        #     self.oldEncounter  :=  a Maps2004Encounter object
        #                            representing that record
        #     yield that Maps2004Encounter object
        #   else ->
        #     Log()  +:=  error message(s) ]
        try:
            encounter = Maps2004Encounter.scanLine(self, self.scan)
            self.oldEncounter = encounter
            yield encounter
            
        except SyntaxError:
            pass

        #-- 2 --
        raise StopIteration

IBP banding data system: Internal maintenance specification