/// <summary> 读取一个值对象
/// </summary>
/// <param name="reader"></param>
/// <param name="type"></param>
/// <returns></returns>
private object ReadValue(UnsafeJsonReader reader, Type type)
{
if (reader.IsEnd())
{
ThrowException("字符串意外结束!");
}
var c = reader.Current;
switch (c)
{
case '[':
reader.MoveNext();
var array = ReadArray(reader, type);
if (reader.Current != ']')
{
ThrowException("缺少闭合的 ]");
}
reader.MoveNext();
return(array);
case '{':
reader.MoveNext();
var obj = ReadObject(reader, type);
if (reader.Current != '}')
{
ThrowException("缺少闭合的 }");
}
reader.MoveNext();
return(obj);
case '"':
case '\'':
{
if (type == typeof(DateTime))
{
return(reader.ReadDateTime());
}
return(ParseString(reader, type));
}
default:
{
object val = reader.ReadConsts();
if (val == null)
{
return(null);
}
if (type.IsInstanceOfType(val) == false)
{
val = Convert.ChangeType(val, type);
}
return(val);
}
}
}
/// <summary> 跳过一个值
/// </summary>
/// <param name="reader"></param>
private void SkipValue(UnsafeJsonReader reader)
{
reader.SkipWhiteChar();
switch (reader.Current)
{
case '[':
reader.MoveNext();
if (reader.SkipChar(']'))
{
return;
}
do
{
SkipValue(reader);
} while (reader.SkipChar(','));
if (reader.Current != ']')
{
ThrowException("缺少闭合的 ]");
}
reader.MoveNext();
break;
case '{':
reader.MoveNext();
if (reader.SkipChar('}'))
{
return;
}
do
{
ReadKey(reader);
SkipValue(reader);
} while (reader.SkipChar(','));
if (reader.Current != '}')
{
ThrowException("缺少闭合的 }");
}
reader.MoveNext();
break;
case '"':
case '\'':
reader.SkipString();
break;
default:
reader.ReadConsts();
break;
}
}
/// <summary> 将字符串解析为指定类型
/// </summary>
/// <param name="str"></param>
/// <param name="type"></param>
/// <returns></returns>
private object ParseString(UnsafeJsonReader reader, Type type)
{
char quot;
string str;
var typecode = Type.GetTypeCode(type);
if ((typecode >= TypeCode.SByte && typecode <= TypeCode.Decimal) || typecode == TypeCode.Boolean)
{
if (type.IsSubclassOf(typeof(Enum)))
{
return(Enum.Parse(type, reader.ReadString()));
}
quot = reader.Current;
if (quot != '\"' && quot != '\'')
{
ThrowMissingCharException(quot);
}
if (reader.SkipChar(quot) == false)
{
ThrowMissingCharException(quot);
}
var val = Convert.ChangeType(reader.ReadConsts(), type);
if (reader.SkipChar(quot) == false)
{
ThrowMissingCharException(quot);
}
return(val);
}
switch (typecode)
{
case TypeCode.DateTime:
return(reader.ReadDateTime());
case TypeCode.Object:
str = reader.ReadString();
if (type == typeof(Guid))
{
try
{
if (str.Length > 30)
{
return(new Guid(str));
}
else
{
return(new Guid(Convert.FromBase64String(str)));
}
}
catch
{
return(Guid.Empty);
}
}
else if (type == typeof(Object))
{
return(str);
}
throw new Exception();
case TypeCode.Char:
return(Char.Parse(reader.ReadString()));
case TypeCode.String:
return(reader.ReadString());
case TypeCode.DBNull:
str = reader.ReadString();
if (str.Length == 0 ||
str == "null" ||
str == "undefined" ||
string.IsNullOrEmpty(str))
{
return(DBNull.Value);
}
throw new Exception();
default:
return(Convert.ChangeType(reader.ReadString(), type));
}
}
