/// <summary>
/// Parses the next token from the input and returns it.
/// </summary>
private JsonToken Parse()
{
char ch = NextClean();
//
// String
//
if (ch == '"' || ch == '\'')
{
return(Yield(JsonToken.String(NextString(ch))));
}
//
// Object
//
if (ch == '{')
{
_reader.Back();
return(ParseObject());
}
//
// Array
//
if (ch == '[')
{
_reader.Back();
return(ParseArray());
}
//
// Handle unquoted text. This could be the values true, false, or
// null, or it can be a number. An implementation (such as this one)
// is allowed to also accept non-standard forms.
//
// Accumulate characters until we reach the end of the text or a
// formatting character.
//
StringBuilder sb = new StringBuilder();
char b = ch;
while (ch >= ' ' && ",:]}/\\\"[{;=#".IndexOf(ch) < 0)
{
sb.Append(ch);
ch = _reader.Next();
}
_reader.Back();
string s = sb.ToString().Trim();
if (s.Length == 0)
{
throw new JsonException("Missing value.");
}
//
// Boolean
//
if (s == JsonBoolean.TrueText || s == JsonBoolean.FalseText)
{
return(Yield(JsonToken.Boolean(s == JsonBoolean.TrueText)));
}
//
// Null
//
if (s == JsonNull.Text)
{
return(Yield(JsonToken.Null()));
}
//
// Number
//
if ((b >= '0' && b <= '9') || b == '.' || b == '-' || b == '+')
{
double unused;
if (!double.TryParse(s, NumberStyles.Float, CultureInfo.InvariantCulture, out unused))
{
throw new JsonException(string.Format("The text '{0}' has the incorrect syntax for a number.", s));
}
return(Yield(JsonToken.Number(s)));
}
//
// Treat as String in all other cases, e.g. when unquoted.
//
return(Yield(JsonToken.String(s)));
}
/// <summary>
/// Yields control back to the reader's user while updating the
/// reader with the new found token and its text.
/// </summary>
private JsonToken Yield(JsonToken token)
{
return(Yield(token, null));
}