private static object DeserializeArray(JsonReaderBase reader)
{
if (reader.ReadChar() != '[')
{
throw new FormatException();
}
var collection = new List <object>();
var first = true;
while (true)
{
reader.SkipSpace();
if (reader.IsEnd)
{
throw new FormatException("配列の閉じ括弧が見つかりません。");
}
if (reader.Peek() == ']')
{
reader.ReadChar();
break;
}
if (!first)
{
if (reader.Peek() != ',')
{
throw new FormatException("配列の区切り文字が見つかりません。");
}
reader.ReadChar();
}
reader.SkipSpace();
collection.Add(Deserialize(reader));
first = false;
}
return(collection.ToArray());
}
private static object Deserialize(JsonReaderBase reader)
{
reader.SkipSpace();
switch (reader.Peek())
{
case '[':
return(DeserializeArray(reader));
case '{':
return(DeserializeObject(reader));
case '"':
return(DeserializeString(reader));
case 't': // true
if (reader.ReadStr(4) != "true")
{
throw new FormatException();
}
return(true);
case 'f': // false
if (reader.ReadStr(5) != "false")
{
throw new FormatException();
}
return(false);
case 'n': // null
if (reader.ReadStr(4) != "null")
{
throw new FormatException();
}
return(null);
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return(DeserializeNumber(1, reader));
case '-':
reader.ReadChar();
return(DeserializeNumber(-1, reader));
default:
throw new FormatException();
}
}
private static object DeserializeObject(JsonReaderBase reader)
{
if (reader.ReadChar() != '{')
{
throw new FormatException();
}
var dic = new Dictionary <string, object>();
var first = true;
while (true)
{
reader.SkipSpace();
if (reader.IsEnd)
{
throw new FormatException("オブジェクトの閉じ括弧が見つかりません。");
}
if (reader.Peek() == '}')
{
reader.ReadChar();
break;
}
if (!first)
{
if (reader.Peek() != ',')
{
throw new FormatException("オブジェクトの区切り文字','が見つかりません。");
}
reader.ReadChar();
}
reader.SkipSpace();
var key = DeserializeString(reader);
reader.SkipSpace();
if (reader.Peek() != ':')
{
throw new FormatException("オブジェクトの区切り文字':'が見つかりません。");
}
reader.ReadChar();
reader.SkipSpace();
var value = Deserialize(reader);
dic[key] = value;
first = false;
}
return(dic);
}
private static object DeserializeNumber(int sign, JsonReaderBase reader)
{
var sb = new StringBuilder();
var is_end_of_numeric = false;
while (!is_end_of_numeric && !reader.IsEnd)
{
char c = reader.Peek();
switch (c)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '.':
case 'e':
case 'E':
sb.Append(reader.ReadChar());
break;
default:
is_end_of_numeric = true;
break;
}
}
var text = sb.ToString();
Int32 value_int32;
if (Int32.TryParse(text, NumberStyles.None, CultureInfo.InvariantCulture.NumberFormat, out value_int32))
{
return(sign * value_int32);
}
Int64 value_int64;
if (Int64.TryParse(text, NumberStyles.None, CultureInfo.InvariantCulture.NumberFormat, out value_int64))
{
return(sign * value_int64);
}
if (sign > 0)
{
UInt32 value_uint32;
if (UInt32.TryParse(text, NumberStyles.None, CultureInfo.InvariantCulture.NumberFormat, out value_uint32))
{
return(value_int32);
}
UInt64 value_uint64;
if (UInt64.TryParse(text, NumberStyles.None, CultureInfo.InvariantCulture.NumberFormat, out value_uint64))
{
return(value_int64);
}
}
Decimal value_decimal;
var success_decimal = Decimal.TryParse(text, NumberStyles.AllowDecimalPoint | NumberStyles.AllowExponent, CultureInfo.InvariantCulture.NumberFormat, out value_decimal);
Double value_double;
var success_double = Double.TryParse(text, NumberStyles.AllowDecimalPoint | NumberStyles.AllowExponent, CultureInfo.InvariantCulture.NumberFormat, out value_double);
if (success_decimal)
{
if (success_double)
{
return(sign * value_double);
}
else
{
return(sign * value_decimal);
}
}
else
{
if (success_double)
{
return(sign * value_double);
}
else
{
throw new FormatException("不正な形式の数値が見つかりました。");
}
}
}
private static string DeserializeString(JsonReaderBase reader)
{
if (reader.ReadChar() != '"')
{
throw new FormatException();
}
var sb = new StringBuilder();
while (!reader.IsEnd)
{
char c = reader.ReadChar();
if (c == '"')
{
break;
}
if (c == '\\')
{
char c2 = reader.ReadChar();
switch (c2)
{
case 'b':
sb.Append('\b');
break;
case 'f':
sb.Append('\f');
break;
case 'n':
sb.Append('\n');
break;
case 'r':
sb.Append('\r');
break;
case 't':
sb.Append('\t');
break;
case 'u':
{
var s = reader.ReadStr(4);
var ch = char.ConvertFromUtf32(Int32.Parse(s, NumberStyles.AllowHexSpecifier, CultureInfo.InvariantCulture));
sb.Append(ch);
}
break;
case '"':
case '\\':
case '/':
sb.Append(c2);
break;
default:
throw new FormatException("不正なエスケープシーケンスが見つかりました。");
}
}
else
{
sb.Append(c);
}
}
return(sb.ToString());
}
