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#! /usr/bin/env crystal
#
# This script generates the file src/crystal/system/win32/zone_names.cr
# that contains mappings for windows time zone names based on the values
# found in https://github.com/unicode-org/cldr/blob/main/common/supplemental/windowsZones.xml
require "http/client"
require "xml"
require "../src/compiler/crystal/formatter"
require "ecr"
WINDOWS_ZONE_NAMES_SOURCE = "https://raw.githubusercontent.com/unicode-org/cldr/817409270794bb1538fe6b4aa3e9c79aff2c34d2/common/supplemental/windowsZones.xml"
TARGET_FILE = File.join(__DIR__, "..", "src", "crystal", "system", "win32", "zone_names.cr")
response = HTTP::Client.get(WINDOWS_ZONE_NAMES_SOURCE)
xml = XML.parse(response.body)
nodes = xml.xpath_nodes("/supplementalData/windowsZones/mapTimezones/mapZone")
entries = nodes.flat_map do |node|
windows_name = node["other"]
territory = node["territory"]
node["type"].split(' ', remove_empty: true).map do |tzdata_name|
{tzdata_name, territory, windows_name}
end
end.sort!
iana_to_windows_items = entries.map do |tzdata_name, territory, windows_name|
{tzdata_name, windows_name}
end.uniq!
windows_zone_names_items = entries.compact_map do |tzdata_name, territory, windows_name|
next unless territory == "001"
location = Time::Location.load(tzdata_name)
next unless location
time = Time.local(location).at_beginning_of_year
zone1 = time.zone
zone2 = (time + 6.months).zone
# southern hemisphere
if zone1.offset > zone2.offset
zone1, zone2 = zone2, zone1
end
{windows_name, zone1.name, zone2.name, location.name}
rescue err : Time::Location::InvalidLocationNameError
pp err
nil
end
source = ECR.render "#{__DIR__}/windows_zone_names.ecr"
source = Crystal.format(source)
File.write(TARGET_FILE, source)
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