#!/usr/bin/env python3

"""Functional Python Programming

Chapter 8, Example Set 1

"""

from Chapter_6.ch06_ex3 import row_iter_kml

from Chapter_4.ch04_ex1 import legs, haversine

import urllib.request

from collections import namedtuple

Leg = namedtuple( "Leg", ("order", "start", "end", "distance") )

Point = namedtuple( "Point", ("latitude", "longitude") )

def pick_lat_lon( lon, lat, alt ):

return lat, lon

def float_lat_lon( row_iter ):

return (

Point( *map(float, pick_lat_lon(*row)) )

for row in row_iter )

def ordered_leg_iter( pair_iter ):

for order, pair in enumerate( pair_iter ):

start, end = pair

yield Leg(order, start, end, round(haversine(start, end),4))

test_parser= """

>>> with urllib.request.urlopen("file:./Winter%202012-2013.kml") as source:

... path_iter = float_lat_lon(row_iter_kml(source))

... pair_iter = legs(path_iter)

... trip_iter = ordered_leg_iter( pair_iter )

... trip= tuple(trip_iter)

>>> len(trip)

73

>>> trip[0]

Leg(order=0, start=Point(latitude=37.54901619777347, longitude=-76.33029518659048), end=Point(latitude=37.840832, longitude=-76.273834), distance=17.7246)

>>> trip[-1]

Leg(order=72, start=Point(latitude=38.330166, longitude=-76.458504), end=Point(latitude=38.976334, longitude=-76.473503), distance=38.8019)

"""

__test__ = {

"test_parser": test_parser,

}

def test():

import doctest

doctest.testmod(verbose=1)

if __name__ == "__main__":

test()