tzextract.cs

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Xml.Schema;
 
internal class Program
{
  private static string app = AppDomain.CurrentDomain.FriendlyName;
  private static TextWriter stderr = Console.Error;
  private static TextWriter stdout = Console.Out;
 
  private static void usage()
  {
    stderr.WriteLine("Usage:");
    stderr.WriteLine(app + " <path to output files>");
    Environment.Exit(1);
  }
 
  private static bool writeZoneMapC(string path)
  {
    string fname = "TimeZoneNameMap";
    string fpath = Path.Combine(path, fname + "_static.h");
 
    using (StreamWriter fs = new StreamWriter(fpath))
    {
      fs.WriteLine("/* Automatically generated by " + app + " */");
      fs.WriteLine("");
      fs.WriteLine("#include \"" + fname + ".h\"");
      fs.WriteLine("");
      fs.WriteLine("static const " + fname + "Entry " + fname + "[] ={");
 
      bool first = true;
      foreach (System.TimeZoneInfo tz in System.TimeZoneInfo.GetSystemTimeZones())
      {
        string iana;
        System.TimeZoneInfo.TryConvertWindowsIdToIanaId(tz.Id, out iana);
 
        StringBuilder sb = new StringBuilder();
        if (!first)
          sb.Append(",");
        first = false;
        sb.Append("{ \"");
        sb.Append(tz.Id);
        sb.Append("\", \"");
        sb.Append(tz.StandardName);
        sb.Append("\", \"");
        sb.Append(tz.DisplayName);
        sb.Append("\", \"");
        sb.Append(tz.DaylightName);
        sb.Append("\", \"");
        sb.Append(iana);
        sb.Append("\" }");
        fs.WriteLine(sb.ToString());
      }
 
      fs.WriteLine("};");
      fs.WriteLine("");
      fs.WriteLine("static const size_t " + fname + "Size = ARRAYSIZE(" + fname + ");");
    }
    return true;
  }
 
  private static bool writeZoneMapJSON(string path)
  {
    string fname = "TimeZoneNameMap";
    string fpath = Path.Combine(path, fname + ".json");
 
    using (StreamWriter fs = new StreamWriter(fpath))
    {
      fs.WriteLine("{");
      fs.WriteLine("\"TimeZoneNameMap\": [");
 
      bool first = true;
      foreach (System.TimeZoneInfo tz in System.TimeZoneInfo.GetSystemTimeZones())
      {
        string iana;
        System.TimeZoneInfo.TryConvertWindowsIdToIanaId(tz.Id, out iana);
 
        StringBuilder sb = new StringBuilder();
        if (!first)
          sb.Append(",");
        first = false;
        sb.Append("{ ");
        sb.Append("\"Id\": \"");
        sb.Append(tz.Id);
        sb.Append("\", \"StandardName\": \"");
        sb.Append(tz.StandardName);
        sb.Append("\", \"DisplayName\": \"");
        sb.Append(tz.DisplayName);
        sb.Append("\", \"DaylightName\": \"");
        sb.Append(tz.DaylightName);
        sb.Append("\", \"Iana\": \"");
        sb.Append(iana);
        sb.Append("\" }");
        fs.WriteLine(sb.ToString());
      }
 
      fs.WriteLine("]");
      fs.WriteLine("}");
    }
    return true;
  }
 
  private static bool writeZoneMap(string path)
  {
    if (!writeZoneMapC(path))
      return false;
    if (!writeZoneMapJSON(path))
      return false;
    return true;
  }
 
  private static void onValidation(object sender, ValidationEventArgs e)
  {
    switch (e.Severity)
    {
      case XmlSeverityType.Warning:
      case XmlSeverityType.Error:
        stderr.WriteLine(e.ToString());
        break;
      default:
        break;
    }
  }
  private static bool updateWindowsIanaMap(string path)
  {
    string url =
        "https://raw.githubusercontent.com/unicode-org/cldr/main/common/supplemental/windowsZones.xml";
    string fname = "WindowsZones";
    string fpath = Path.Combine(path, fname + ".c");
 
    XmlDocument doc = new XmlDocument();
    doc.Load(url);
 
    stdout.WriteLine("Downloaded and parsed XML from '" + url + "'");
 
    ValidationEventHandler handler = new ValidationEventHandler(onValidation);
    // doc.Validate(handler);
 
    XmlNodeList versions = doc.SelectNodes("//supplementalData/version");
    XmlNodeList zones = doc.SelectNodes("//supplementalData/windowsZones/mapTimezones");
    XmlNodeList mzones =
        doc.SelectNodes("//supplementalData/windowsZones/mapTimezones/mapZone");
 
    using (StreamWriter fs = new StreamWriter(fpath))
    {
      fs.WriteLine("/* Automatically generated by " + app);
      fs.WriteLine(" *");
      fs.WriteLine(" * url " + url);
 
      foreach (XmlNode version in versions)
      {
        XmlNode nr = version.Attributes.GetNamedItem("number");
        fs.WriteLine(" * version: " + nr.InnerText);
      }
 
      foreach (XmlNode node in zones)
      {
        XmlNode over = node.Attributes.GetNamedItem("otherVersion");
        XmlNode tver = node.Attributes.GetNamedItem("typeVersion");
        fs.WriteLine(" * mapTimezones: otherVersion: " + over.InnerText +
                     ", typeVersion: " + tver.InnerText);
      }
 
      fs.WriteLine(" */");
      fs.WriteLine("");
      fs.WriteLine("#include \"" + fname + ".h\"");
      fs.WriteLine("");
      fs.WriteLine("const WINDOWS_TZID_ENTRY " + fname + "[] = {");
 
      foreach (XmlNode mzone in mzones)
      {
        XmlAttributeCollection attrs = mzone.Attributes;
        XmlNode wzid = attrs.GetNamedItem("other");
        XmlNode territory = attrs.GetNamedItem("territory");
        XmlNode iana = attrs.GetNamedItem("type");
        fs.WriteLine("\t{ \"" + iana.InnerText + "\", \"" + wzid.InnerText + "\" }, // " +
                     territory.InnerText);
      }
 
      fs.WriteLine("};");
      fs.WriteLine("");
      fs.WriteLine("const size_t " + fname + "NrElements = ARRAYSIZE(" + fname + ");");
    }
    stdout.WriteLine("Finished update");
    return true;
  }
 
  private static void Main(string[] args)
  {
    try
    {
      if (args.Length == 0)
      {
        stderr.WriteLine("Missing arguments!");
        usage();
      }
 
      DirectoryInfo info = new DirectoryInfo(args[0]);
      if (!info.Exists)
      {
        stderr.WriteLine("Path '" + info.FullName + "' does not exist");
        usage();
      }
 
      if (!writeZoneMap(info.FullName))
        return;
 
      updateWindowsIanaMap(info.FullName);
    }
    catch (Exception e)
    {
      stderr.WriteLine(e.ToString());
      Environment.Exit(-23);
    }
  }
}