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From Fran. validators for LATITUDE and LONGITUDE

class IS_LAT(object):
      """
      example:

INPUT(_type='text',_name='name',requires=IS_LAT())

latitude has to be in degrees between -90 & 90
      """
      def __init__(self, error_message='Latitude/Northing should be between -90 & 90!'):
        self.minimum=-90
        self.maximum=90
        self.error_message = error_message
      def __call__(self, value):
        try:
            value = float(value)
            if self.minimum <= value <= self.maximum: return (value,None)
        except ValueError: pass
        return (value, self.error_message)

class IS_LON(object):
      """
      example:
  
      INPUT(_type='text',_name='name',requires=IS_LON())
 
      longitude has to be in degrees between -180 & 180
      """
      def __init__(self, error_message='Longitude/Easting should be between -180 & 180!'):
        self.minimum=-180
        self.maximum=180
        self.error_message = error_message
      def __call__(self, value):
        try:
            value = float(value)
            if self.minimum <= value <= self.maximum: return (value,None)
        except ValueError: pass
        return (value, self.error_message)

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