[DFDL-WG] Pseudocode in null-default-optional proposal

[Simon Parker]

I said I would try to simplify this pseudocode in section 6.2 of the
proposal:
 
for $child in original sequence children declarations
  for $i = 1 to length of array
     if array[$i].name = $child.name // including namespace comparison
     then add array[$i] to $matches
     if array[$i].name != $child.name // including namespace comparison
     then break;                      // stop at first non-match
  assert( $child.minOccurs <= $matches.size ) // processing error
otherwise
  assert( $child.maxOccurs >= $matches.size ) // ditto
  append $matches to $result
return $result
 
 
I came up with this:
 
int $index = 1
for each $child in schema
 int $count = 0
 while $index <= array.size
 and array[$index].name = $child.name
  increment $index
  increment $count
 end
 assert( $child.minOccurs <= $count ) // processing error otherwise
 assert( $child.maxOccurs >= $count ) // ditto
end
return array

... but I'm not convinced this programming exercise added to the
readability of the specification. I'll keep trying to find a better
style, but I'm not sure I understand it well enough yet.
 
 Simon
 
Simon Parker
Software Consultant
PolarLake
80 Harcourt Street
Dublin 2, Ireland
 
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