IBP banding data system: Internal maintenance specification |  |
IBP banding data system: Internal maintenance specification | |
Represents a wing length field. The value is optional, and single-column ditto is not supported. For the input format, see the specification.
# - - - - - c l a s s W i n g F i e l d - - - - -
class WingField(FieldItem):
'''Represents a wing length in millimeters.
Exports, other than those inherited:
.wing: [ wing length in millimeters ]
'''
We gather in the field to variable rawField
first; if all those characters are blank, we do nothing, so
that the containing encounter field will have
a value of None, and be flattened as a string
of spaces.
# - - - W i n g F i e l d . s c a n F i e l d - - -
@staticmethod
def scanField(encounter, scan, fieldName):
'''Scan a wing-length field.
'''
#-- 1 --
# [ if the line in scan starts with WING_L characters ->
# scan := scan advanced by WING_L
# rawText := next WING_L characters from scan
# else ->
# Log() +:= error message
# raise SyntaxError ]
try:
rawText = scan.move(WING_L)
except IndexError:
scan.syntax("Expecting a %d-digit wing field." % WING_L)
#-- 2 --
# [ if rawText is all blank ->
# return
# else if rawText is a valid integer ->
# encounter.(fieldName) := that integer
# else ->
# Log() +:= error message
# raise SyntaxError ]
if len(rawText.strip()) == 0:
return
else:
try:
wing = int(rawText)
except ValueError:
scan.syntax("Wing field '%s' is not a proper "
"integer." % rawText)
#-- 3 --
# [ encounter.(fieldName) := wing ]
setattr(encounter, fieldName,
WingField(encounter, wing))