/// <summary>
/// 注册尝试从指定流获取指定键的值回调函数。
/// </summary>
/// <param name="version">尝试从指定流获取指定键的值回调函数的版本。</param>
/// <param name="callback">尝试从指定流获取指定键的值回调函数。</param>
public void RegisterTryGetValueCallback(byte version, TryGetValueCallback callback)
{
if (callback == null)
{
throw new GXException("Try get value callback is invalid.");
}
m_TryGetValueCallbacks[version] = callback;
}
/// <summary>
/// 尝试从指定流获取指定键的值。
/// </summary>
/// <param name="stream">指定流。</param>
/// <param name="key">指定键。</param>
/// <param name="value">指定键的值。</param>
/// <returns>从指定流获取指定键的值是否成功。</returns>
public bool TryGetValue(Stream stream, string key, out object value)
{
value = null;
using (BinaryReader binaryReader = new BinaryReader(stream, Encoding.UTF8))
{
byte[] header = GetHeader();
if (binaryReader.ReadByte() != header[0] || binaryReader.ReadByte() != header[1] || binaryReader.ReadByte() != header[2])
{
return(false);
}
byte version = binaryReader.ReadByte();
TryGetValueCallback callback = null;
if (!m_TryGetValueCallbacks.TryGetValue(version, out callback))
{
return(false);
}
return(callback(binaryReader, key, out value));
}
}
/// <summary>
/// 尝试从指定流获取指定键的值。
/// </summary>
/// <param name="stream">指定流。</param>
/// <param name="key">指定键。</param>
/// <param name="value">指定键的值。</param>
/// <returns>是否从指定流获取指定键的值成功。</returns>
public bool TryGetValue(Stream stream, string key, out object value)
{
value = null;
byte[] header = GetHeader();
byte header0 = (byte)stream.ReadByte();
byte header1 = (byte)stream.ReadByte();
byte header2 = (byte)stream.ReadByte();
if (header0 != header[0] || header1 != header[1] || header2 != header[2])
{
return(false);
}
byte version = (byte)stream.ReadByte();
TryGetValueCallback callback = null;
if (!m_TryGetValueCallbacks.TryGetValue(version, out callback))
{
return(false);
}
return(callback(stream, key, out value));
}
public static string Format(this string text, TryGetValueCallback tryGetValue, IFormatProvider formatProvider = null)
{
if (string.IsNullOrEmpty(text))
{
return(text);
}
if (tryGetValue == null)
{
throw new ArgumentNullException(nameof(tryGetValue));
}
formatProvider = formatProvider ?? new DefaultFormatter();
// https://regex101.com/r/sK1tS8/5
var result = Regex.Replace(text, PlaceholderPattern, match =>
{
var name = match.Groups[GroupName.PlaceholderName].Value;
var alignment = match.Groups[GroupName.Alignment].Success ? "," + match.Groups[GroupName.Alignment].Value : string.Empty;
var formatString = match.Groups[GroupName.FormatString].Success ? ":" + match.Groups[GroupName.FormatString].Value : string.Empty;
if (tryGetValue(name, out var value))
{
// Apply formatting.
return(string.Format(formatProvider, $"{{0{alignment}{formatString}}}", value));
}
else
{
// Reconstruct the format string.
return($"{{{name}{alignment}{formatString}}}");
}
});
// https://regex101.com/r/zG6tF7/3
result = Regex.Replace(result, "{{(?<contents>.+?)}}", match => $"{{{match.Groups["contents"].Value}}}");
return(result);
}
