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#!/usr/bin/env python3
from typing import NamedTuple
import argparse
import csv
import io
import logging
import operator
import re
import sys
from datetime import datetime
from datetime import UTC
from pathlib import Path
from urllib.request import urlopen
SCHEMES_URL = "https://www.iana.org/assignments/uri-schemes/uri-schemes-1.csv"
COUNTRY_URL = "https://data.iana.org/time-zones/data/iso3166.tab"
ZONE_URL = "https://data.iana.org/time-zones/data/zone.tab"
BOILER_PLATE = """# Generated by get_iana_data.py @ {current_date}
from typing import NamedTuple
class ZoneData(NamedTuple):
key: str
full_name: str
short_name: str
country_code: str
country_name: str
def get_zone_data(key: str) -> ZoneData:
return ZoneData(*ZONE_DATA[key])
"""
logging.basicConfig(level="INFO", format="%(levelname)s: %(message)s")
class ZoneData(NamedTuple):
key: str
full_name: str
short_name: str
country_code: str
country_name: str
def download_file(url: str) -> str:
logging.info("Download: %s", url)
with urlopen(url) as f:
content = f.read()
return content.decode()
def parse_uri_schemes(content: str) -> list[str]:
logging.info("Parse uri schemes")
schemes: list[str] = []
reader = csv.reader(io.StringIO(content), delimiter=",")
next(reader) # Skip header row
for line in reader:
scheme = line[0].lower().removesuffix(" (obsolete)")
if not re.fullmatch("[a-z0-9+.-]+", scheme):
logging.warning("unexpected scheme field contents: %s", scheme)
continue
schemes.append(scheme)
return schemes
def parse_zone_names(content: str) -> list[tuple[str, str]]:
logging.info("Parse tz data")
zones: list[tuple[str, str]] = []
data = csv.reader(io.StringIO(content), delimiter="\t")
for row in data:
if not row or row[0].startswith("#"):
continue
zones.append((row[0], row[2]))
zones.sort(key=operator.itemgetter(1))
return zones
def parse_country_names(content: str) -> dict[str, str]:
logging.info("Parse country data")
countries: dict[str, str] = {}
data = csv.reader(io.StringIO(content), delimiter="\t")
for row in data:
if not row or row[0].startswith("#"):
continue
countries[row[0]] = row[1]
return countries
def merge_zone_data(
zones: list[tuple[str, str]], countries: dict[str, str]
) -> dict[str, ZoneData]:
data: dict[str, ZoneData] = {}
for country_code, key in zones:
country_name = countries[country_code]
full_name = key.replace("_", " ")
short_name = full_name.rsplit("/", maxsplit=1)[1]
data[key] = ZoneData(
key=key,
full_name=full_name,
short_name=short_name,
country_code=country_code,
country_name=country_name,
)
return data
def generate_output(
schemes: list[str], zones: dict[str, ZoneData], outpath: Path
) -> None:
logging.info("Generate output")
current_date = datetime.now(tz=UTC).isoformat()
content = BOILER_PLATE.format(current_date=current_date)
content += "ZONE_DATA = {\n"
for key, zone_data in zones.items():
zone_data_tuple = ", ".join([repr(d) for d in zone_data])
content += f" '{key}': ({zone_data_tuple}),\n"
content += "}\n\n\n"
content += "URI_SCHEMES = {\n"
for scheme in schemes:
content += f" '{scheme}',\n"
content += "}\n"
outpath.write_text(content)
logging.info("Wrote file to %s", outpath)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Generate IANA data")
parser.add_argument("out", help="Path to output file")
args = parser.parse_args()
outpath = Path(args.out)
if outpath.is_dir():
sys.exit("Output path is a directory")
scheme_content = download_file(SCHEMES_URL)
schemes = parse_uri_schemes(scheme_content)
country_file_data = download_file(COUNTRY_URL)
zone_file_data = download_file(ZONE_URL)
country_data = parse_country_names(country_file_data)
zone_data = parse_zone_names(zone_file_data)
zones = merge_zone_data(zone_data, country_data)
generate_output(schemes, zones, outpath)
logging.info("Finished !")
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