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#!/usr/bin/env python3
import sys
import math
import struct
import xml.etree.ElementTree as ET
from gi.repository import GLib
tree = ET.parse(sys.argv[1])
root = tree.getroot()
assert root.tag == "gweather"
assert root.attrib['format'] == "1.0"
# Maybe types are annoying to use in C (as it requires first querying the maybe
# and then the actual value). It is easier to use a fixed value for invalid
# indices
INVALID_IDX = 0xffff
# GWthDB01 as an integer
FILETYPE_MAGIC = 0x5747687442443130
levels = {
'gweather' : 0,
'region' : 1,
'country' : 2,
'state' : 3,
'city' : 4,
'location' : 5,
'named-timezone' : 7,
}
locations = []
timezones = []
loc_by_metar = []
loc_by_country = []
all_ccodes = set()
def get_name(elem):
name = elem.find('_name')
if name is None:
name = elem.find('name')
msgctx = ''
else:
msgctx = name.get('msgctx', default='')
if name is None:
return '', ''
return name.text, msgctx
def get_coordinates(elem):
coordinates = elem.findtext('coordinates')
if coordinates:
return tuple(float(c) * math.pi / 180.0 for c in coordinates.split())
return float("NaN"), float("NaN")
# This is the same math as location_distance in gweather-location.c
def calc_distance(loc_a, loc_b):
# average earth radius
radius = 6372.795
c_a = get_coordinates(loc_a)
c_b = get_coordinates(loc_b)
if c_a is None or c_b is None:
return float("inf")
if c_a == c_b:
return 0
return math.acos(math.cos(c_a[0]) * math.cos(c_b[0]) * math.cos(c_a[1] - c_b[1]) +
math.sin(c_a[0]) * math.sin(c_b[0])) * radius
def tz_variant(tz_new):
obsoletes = []
for item in tz_new.findall('obsoletes'):
obsoletes.append(item.text)
return GLib.Variant('((ss)as)', (
get_name(tz_new),
obsoletes
))
def find_children(loc):
children = []
# find direct children
for child in loc.find('.'):
if child.tag in levels:
children.append(locations.index(child))
return children
def find_timezones(loc):
zones = []
for tz_list in loc.findall('timezones'):
for tz_ in tz_list.findall('timezone'):
zones.append(timezones.index(tz_))
return zones
parent_map = {c:p for p in root.iter() for c in p}
def loc_variant(loc):
children = find_children(loc)
# Sort by distance from self; this is assumed for the locations inside a city
children.sort(key=lambda c: calc_distance(loc, locations[c]))
zones = find_timezones(loc)
coordinate = get_coordinates(loc)
tz_hint = loc.findtext('tz-hint')
if tz_hint:
for i, tz_ in enumerate(timezones):
if tz_.get('id') == tz_hint:
tz_hint = i
break
else:
raise AssertionError("Should not be reached")
name = get_name(loc)
parent = parent_map.get(loc)
try:
parent_idx = locations.index(parent)
except ValueError:
parent_idx = None
nearest_idx = None
if loc.tag == 'city' and len(children) == 0:
# Try to lookup the nearest sibling location, with a maximum distance
# of AIRPORT_MAX_DISTANCE (100km).
nearest = None
nearest_dist = -1
for i in parent.findall('location'):
dist = calc_distance(loc, i)
if dist > 100:
continue
if nearest is None or dist < nearest_dist:
nearest = i
nearest_dist = dist
if nearest:
nearest_idx = locations.index(nearest)
return GLib.Variant('((ss)ss(dd)ssqyqqaqaq)', (
name,
loc.findtext('zone', default=''),
loc.findtext('radar', default=''),
coordinate,
loc.findtext('iso-code', default=''),
loc.findtext('code', default=''),
tz_hint if tz_hint is not None else INVALID_IDX,
levels[loc.tag],
nearest_idx if nearest_idx is not None else INVALID_IDX,
parent_idx if parent_idx is not None else INVALID_IDX,
children,
zones,
))
locations.append(root)
# Pre-populate the lists to be able to generate indices
for location in root.iter('named-timezone'):
locations.append(location)
loc_by_metar.append(location)
assert location.findtext('code') is not None
for location in root.iter('region'):
locations.append(location)
for location in root.iter('country'):
locations.append(location)
loc_by_country.append(location)
c = location.findtext('iso-code')
assert c is not None
assert c not in all_ccodes
all_ccodes.add(c)
for location in root.iter('state'):
locations.append(location)
for location in root.iter('city'):
locations.append(location)
for location in root.iter('location'):
locations.append(location)
loc_by_metar.append(location)
assert location.findtext('code') is not None
for timezone in root.iter('timezone'):
timezones.append(timezone)
assert timezone.get('id') is not None
timezones.sort(key=lambda tz: tz.get('id'))
loc_by_country.sort(key=lambda loc: loc.findtext('iso-code'))
loc_by_metar.sort(key=lambda loc: loc.findtext('code'))
loc_by_country_var = [(loc.findtext('iso-code'), locations.index(loc)) for loc in loc_by_country]
loc_by_metar_var = [(loc.findtext('code'), locations.index(loc)) for loc in loc_by_metar]
timezones_var = [(tz.get('id'), tz_variant(tz)) for tz in timezones]
locations_var = [loc_variant(loc) for loc in locations]
res = GLib.Variant("(ta{sq}a{sq}a{s((ss)as)}a((ss)ss(dd)ssqyqqaqaq))", (
FILETYPE_MAGIC,
loc_by_country_var,
loc_by_metar_var,
timezones_var,
locations_var
))
if struct.pack('h', 0x01)[0]:
# byteswap on little endian; not currently, we might do this again if the
# schema compiler improves
#res = res.byteswap()
pass
data = res.get_data_as_bytes().get_data()
with open(sys.argv[2], 'bw') as f:
f.write(data)
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