private object GetNumberFromString(MyStringReader jsonString, char ch)
{
StringBuilder sb = new StringBuilder();
sb.Append(ch);
bool isFloatingPoint = false;
while (true)
{
ch = jsonString.ReadChar();
if (!((ch >= '0' && ch <= '9') || ch == '.' || (isFloatingPoint && (ch == 'e' || ch == 'E' || ch == '-' || ch == '+'))))
{
jsonString.Position -= 1;
break;
}
sb.Append(ch);
if (ch == '.' && !isFloatingPoint)
{
isFloatingPoint = true;
}
else if (ch == '.' && isFloatingPoint)
{
throw new Exception("Invalid JSON document.");
}
}
if (!isFloatingPoint)
{
int temp;
if (int.TryParse(sb.ToString(), out temp))
{
return(temp);
}
else
{
throw new Exception("Invalid JSON document.");
}
}
else
{
double temp;
if (double.TryParse(sb.ToString(), out temp))
{
return(temp);
}
else
{
throw new Exception("Invalid JSON document.");
}
}
}
private string GetStringFromString(MyStringReader jsonString)
{
char ch;
StringBuilder sb = new StringBuilder();
bool backslashMode = false;
while (true)
{
ch = jsonString.ReadChar();
if (backslashMode)
{
switch (ch)
{
case 'n': sb [sb.Length - 1] = '\n'; break;
case 'r': sb [sb.Length - 1] = '\r'; break;
case 't': sb [sb.Length - 1] = '\t'; break;
case '\\': sb [sb.Length - 1] = '\\'; break;
case '"': sb [sb.Length - 1] = '"'; break;
case '/': sb [sb.Length - 1] = '/'; break;
case 'b': sb [sb.Length - 1] = '\b'; break;
case 'f': sb [sb.Length - 1] = '\f'; break;
case 'u':
sb.Remove(sb.Length - 1, 1);
sb.Append(ToNumberFromHexa(jsonString.ReadChars(2)));
sb.Append(ToNumberFromHexa(jsonString.ReadChars(2)));
break;
default: throw new Exception();
}
backslashMode = false;
}
else if (ch == '"')
{
break;
}
else
{
sb.Append(ch);
if (ch == '\\')
{
backslashMode = true;
}
}
}
return(sb.ToString());
}
private JsonContainer ParseString(MyStringReader jsonString)
{
try
{
ParseState parseMode = ParseState.None;
ParseState parseState = ParseState.None;
Queue <object> tokenStack = new Queue <object> ();
while (true)
{
char rc = '\0';
do
{
rc = jsonString.ReadChar();
} while (rc == ' ' || rc == ' '|| rc == ' ' || rc == '\n' || rc == '\r');
if (rc == ':')
{
if (!(parseMode == ParseState.Object && parseState == ParseState.Key))
{
throw new Exception("Invalid JSON document.");
}
parseState = ParseState.Value;
}
else if (rc == ',')
{
if (parseState != ParseState.Value)
{
throw new Exception("Invalid JSON document.");
}
parseState = (parseMode == ParseState.Object) ? ParseState.Key : ParseState.Value;
}
else if (rc == '"')
{
tokenStack.Enqueue(GetStringFromString(jsonString));
}
else if (rc == 't' || rc == 'f' || rc == 'n')
{
tokenStack.Enqueue(GetKeywordFromString(jsonString, rc));
}
else if ((rc >= '0' && rc <= '9') || rc == '-' || rc == '+')
{
tokenStack.Enqueue(GetNumberFromString(jsonString, rc));
}
else if (rc == '{' || rc == '[')
{
if (parseState == ParseState.Value)
{
jsonString.Position -= 1;
tokenStack.Enqueue(ParseString(jsonString));
}
else
{
switch (rc)
{
case '{': parseMode = ParseState.Object; parseState = ParseState.Key; break;
case '[': parseMode = ParseState.Array; parseState = ParseState.Value; break;
}
}
}
else if ((rc == '}' && parseMode == ParseState.Object) || (rc == ']' && parseMode == ParseState.Array))
{
break;
}
else
{
throw new ArgumentException("Invalid JSON document.");
}
}
return(Build(parseMode, tokenStack));
}
catch { throw new ArgumentException("Invalid JSON document."); }
}
