def parse_cost_equation(source, constraints):
 if ('cost' in constraints):
  raise error('more than one cost equation', source.string, source.pos)
 cost = {}
 parse_cost_term(source, cost)
 while source.match('+'):
  parse_cost_term(source, cost)
 max_inc = parse_fuzzy_compare(source)
 if (max_inc is None):
  raise ParseError()
 max_cost = int(parse_count(source))
 if (not max_inc):
  max_cost -= 1
 if (max_cost < 0):
  raise error('bad fuzzy cost limit', source.string, source.pos)
 cost['max'] = max_cost
 constraints['cost'] = cost

def parse_cost_equation ( source , constraints ) : if ( 'cost' in constraints ) : raise error ( 'more than one cost equation' , source . string , source . pos ) cost = { } parse_cost_term ( source , cost ) while source . match ( '+' ) : parse_cost_term ( source , cost ) max_inc = parse_fuzzy_compare ( source ) if ( max_inc is None ) : raise ParseError ( ) max_cost = int ( parse_count ( source ) ) if ( not max_inc ) : max_cost -= 1 if ( max_cost < 0 ) : raise error ( 'bad fuzzy cost limit' , source . string , source . pos ) cost [ 'max' ] = max_cost constraints [ 'cost' ] = cost
parses a cost equation .