'''Return the pb_field_t initializer to use in the constant array.
prev_field_name is the name of the previous field or None.
'''
'''Return the pb_field_t initializer to use in the constant array.
prev_field_name is the name of the previous field or None.
'''
result += '%-8s, ' % self.pbtype
result += '%s, ' % self.rules
result += '%s, ' % self.allocation
result += '%-8s, ' % self.pbtype
result += '%s, ' % self.rules
result += '%s, ' % self.allocation
result += '%s, ' % self.struct_name
result += '%s, ' % self.name
result += '%s, ' % (prev_field_name or self.name)
result += '%s, ' % self.struct_name
result += '%s, ' % self.name
result += '%s, ' % (prev_field_name or self.name)