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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
using Microsoft.Win32;
namespace System.Globalization
{
public partial class JapaneseCalendar : Calendar
{
private const string c_japaneseErasHive = @"System\CurrentControlSet\Control\Nls\Calendars\Japanese\Eras";
private const string c_japaneseErasHivePermissionList = @"HKEY_LOCAL_MACHINE\" + c_japaneseErasHive;
// We know about 4 built-in eras, however users may add additional era(s) from the
// registry, by adding values to HKLM\SYSTEM\CurrentControlSet\Control\Nls\Calendars\Japanese\Eras
//
// Registry values look like:
// yyyy.mm.dd=era_abbrev_english_englishabbrev
//
// Where yyyy.mm.dd is the registry value name, and also the date of the era start.
// yyyy, mm, and dd are the year, month & day the era begins (4, 2 & 2 digits long)
// era is the Japanese Era name
// abbrev is the Abbreviated Japanese Era Name
// english is the English name for the Era (unused)
// englishabbrev is the Abbreviated English name for the era.
// . is a delimiter, but the value of . doesn't matter.
// '_' marks the space between the japanese era name, japanese abbreviated era name
// english name, and abbreviated english names.
private static EraInfo[] GetJapaneseEras()
{
// Look in the registry key and see if we can find any ranges
int iFoundEras = 0;
EraInfo[] registryEraRanges = null;
try
{
// Need to access registry
RegistryKey key = RegistryKey.GetBaseKey(RegistryKey.HKEY_LOCAL_MACHINE).OpenSubKey(c_japaneseErasHive, false);
// Abort if we didn't find anything
if (key == null) return null;
// Look up the values in our reg key
String[] valueNames = key.GetValueNames();
if (valueNames != null && valueNames.Length > 0)
{
registryEraRanges = new EraInfo[valueNames.Length];
// Loop through the registry and read in all the values
for (int i = 0; i < valueNames.Length; i++)
{
// See if the era is a valid date
EraInfo era = GetEraFromValue(valueNames[i], key.GetValue(valueNames[i]).ToString());
// continue if not valid
if (era == null) continue;
// Remember we found one.
registryEraRanges[iFoundEras] = era;
iFoundEras++;
}
}
}
catch (System.Security.SecurityException)
{
// If we weren't allowed to read, then just ignore the error
return null;
}
catch (System.IO.IOException)
{
// If key is being deleted just ignore the error
return null;
}
catch (System.UnauthorizedAccessException)
{
// Registry access rights permissions, just ignore the error
return null;
}
//
// If we didn't have valid eras, then fail
// should have at least 4 eras
//
if (iFoundEras < 4) return null;
//
// Now we have eras, clean them up.
//
// Clean up array length
Array.Resize(ref registryEraRanges, iFoundEras);
// Sort them
Array.Sort(registryEraRanges, CompareEraRanges);
// Clean up era information
for (int i = 0; i < registryEraRanges.Length; i++)
{
// eras count backwards from length to 1 (and are 1 based indexes into string arrays)
registryEraRanges[i].era = registryEraRanges.Length - i;
// update max era year
if (i == 0)
{
// First range is 'til the end of the calendar
registryEraRanges[0].maxEraYear = GregorianCalendar.MaxYear - registryEraRanges[0].yearOffset;
}
else
{
// Rest are until the next era (remember most recent era is first in array)
registryEraRanges[i].maxEraYear = registryEraRanges[i - 1].yearOffset + 1 - registryEraRanges[i].yearOffset;
}
}
// Return our ranges
return registryEraRanges;
}
//
// Compare two era ranges, eg just the ticks
// Remember the era array is supposed to be in reverse chronological order
//
private static int CompareEraRanges(EraInfo a, EraInfo b)
{
return b.ticks.CompareTo(a.ticks);
}
//
// GetEraFromValue
//
// Parse the registry value name/data pair into an era
//
// Registry values look like:
// yyyy.mm.dd=era_abbrev_english_englishabbrev
//
// Where yyyy.mm.dd is the registry value name, and also the date of the era start.
// yyyy, mm, and dd are the year, month & day the era begins (4, 2 & 2 digits long)
// era is the Japanese Era name
// abbrev is the Abbreviated Japanese Era Name
// english is the English name for the Era (unused)
// englishabbrev is the Abbreviated English name for the era.
// . is a delimiter, but the value of . doesn't matter.
// '_' marks the space between the japanese era name, japanese abbreviated era name
// english name, and abbreviated english names.
private static EraInfo GetEraFromValue(String value, String data)
{
// Need inputs
if (value == null || data == null) return null;
//
// Get Date
//
// Need exactly 10 characters in name for date
// yyyy.mm.dd although the . can be any character
if (value.Length != 10) return null;
int year;
int month;
int day;
ReadOnlySpan<char> valueSpan = value.AsReadOnlySpan();
if (!Int32.TryParse(valueSpan.Slice(0, 4), NumberStyles.None, NumberFormatInfo.InvariantInfo, out year) ||
!Int32.TryParse(valueSpan.Slice(5, 2), NumberStyles.None, NumberFormatInfo.InvariantInfo, out month) ||
!Int32.TryParse(valueSpan.Slice(8, 2), NumberStyles.None, NumberFormatInfo.InvariantInfo, out day))
{
// Couldn't convert integer, fail
return null;
}
//
// Get Strings
//
// Needs to be a certain length e_a_E_A at least (7 chars, exactly 4 groups)
String[] names = data.Split('_');
// Should have exactly 4 parts
// 0 - Era Name
// 1 - Abbreviated Era Name
// 2 - English Era Name
// 3 - Abbreviated English Era Name
if (names.Length != 4) return null;
// Each part should have data in it
if (names[0].Length == 0 ||
names[1].Length == 0 ||
names[2].Length == 0 ||
names[3].Length == 0)
return null;
//
// Now we have an era we can build
// Note that the era # and max era year need cleaned up after sorting
// Don't use the full English Era Name (names[2])
//
return new EraInfo(0, year, month, day, year - 1, 1, 0,
names[0], names[1], names[3]);
}
// PAL Layer ends here
private static string[] s_japaneseErasEnglishNames = new String[] { "M", "T", "S", "H" };
private static string GetJapaneseEnglishEraName(int era)
{
Debug.Assert(era > 0);
return era <= s_japaneseErasEnglishNames.Length ? s_japaneseErasEnglishNames[era - 1] : " ";
}
}
}
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