private void ParseNumber()
{
ShiftBufferIfNeeded();
char firstChar = _chars[_charPos];
int initialPosition = _charPos;
ReadNumberIntoBuffer();
_stringReference = new StringReference(_chars, initialPosition, _charPos - initialPosition);
object numberValue;
JsonToken numberType;
bool singleDigit = (char.IsDigit(firstChar) && _stringReference.Length == 1);
bool nonBase10 = (firstChar == '0' && _stringReference.Length > 1
&& _stringReference.Chars[_stringReference.StartIndex + 1] != '.'
&& _stringReference.Chars[_stringReference.StartIndex + 1] != 'e'
&& _stringReference.Chars[_stringReference.StartIndex + 1] != 'E');
if (_readType == ReadType.ReadAsInt32)
{
if (singleDigit)
{
// digit char values start at 48
numberValue = firstChar - 48;
}
else if (nonBase10)
{
string number = _stringReference.ToString();
// decimal.Parse doesn't support parsing hexadecimal values
int integer = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase)
? Convert.ToInt32(number, 16)
: Convert.ToInt32(number, 8);
numberValue = integer;
}
else
{
numberValue = ConvertUtils.Int32Parse(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length);
}
numberType = JsonToken.Integer;
}
else if (_readType == ReadType.ReadAsDecimal)
{
if (singleDigit)
{
// digit char values start at 48
numberValue = (decimal)firstChar - 48;
}
else if (nonBase10)
{
string number = _stringReference.ToString();
// decimal.Parse doesn't support parsing hexadecimal values
long integer = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase)
? Convert.ToInt64(number, 16)
: Convert.ToInt64(number, 8);
numberValue = Convert.ToDecimal(integer);
}
else
{
string number = _stringReference.ToString();
numberValue = decimal.Parse(number, NumberStyles.Number | NumberStyles.AllowExponent, CultureInfo.InvariantCulture);
}
numberType = JsonToken.Float;
}
else
{
if (singleDigit)
{
// digit char values start at 48
numberValue = (long)firstChar - 48;
numberType = JsonToken.Integer;
}
else if (nonBase10)
{
string number = _stringReference.ToString();
numberValue = number.StartsWith("0x", StringComparison.OrdinalIgnoreCase)
? Convert.ToInt64(number, 16)
: Convert.ToInt64(number, 8);
numberType = JsonToken.Integer;
}
else
{
long value;
ParseResult parseResult = ConvertUtils.Int64TryParse(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length, out value);
if (parseResult == ParseResult.Success)
{
numberValue = value;
numberType = JsonToken.Integer;
}
else if (parseResult == ParseResult.Invalid)
{
string number = _stringReference.ToString();
if (_floatParseHandling == FloatParseHandling.Decimal)
numberValue = decimal.Parse(number, NumberStyles.Number | NumberStyles.AllowExponent, CultureInfo.InvariantCulture);
else
numberValue = Convert.ToDouble(number, CultureInfo.InvariantCulture);
numberType = JsonToken.Float;
}
else if (parseResult == ParseResult.Overflow)
{
#if !(NET20 || NET35 || SILVERLIGHT || PORTABLE40 || PORTABLE)
string number = _stringReference.ToString();
numberValue = BigInteger.Parse(number, CultureInfo.InvariantCulture);
numberType = JsonToken.Integer;
#else
// todo - validate number was a valid integer to make sure overflow was the reason for failure
throw JsonReaderException.Create(this, "JSON integer {0} is too large or small for an Int64.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
#endif
}
else
{
throw JsonReaderException.Create(this, "Unknown error parsing integer.");
}
}
}
ClearRecentString();
SetToken(numberType, numberValue);
}
private void ParseConstructor()
{
if (MatchValueWithTrailingSeperator("new"))
{
EatWhitespace(false);
int initialPosition = _charPos;
int endPosition;
while (true)
{
char currentChar = _chars[_charPos];
if (currentChar == '\0')
{
if (_charsUsed == _charPos)
{
if (ReadData(true) == 0)
throw JsonReaderException.Create(this, "Unexpected end while parsing constructor.");
}
else
{
endPosition = _charPos;
_charPos++;
break;
}
}
else if (char.IsLetterOrDigit(currentChar))
{
_charPos++;
}
else if (currentChar == StringUtils.CarriageReturn)
{
endPosition = _charPos;
ProcessCarriageReturn(true);
break;
}
else if (currentChar == StringUtils.LineFeed)
{
endPosition = _charPos;
ProcessLineFeed();
break;
}
else if (char.IsWhiteSpace(currentChar))
{
endPosition = _charPos;
_charPos++;
break;
}
else if (currentChar == '(')
{
endPosition = _charPos;
break;
}
else
{
throw JsonReaderException.Create(this, "Unexpected character while parsing constructor: {0}.".FormatWith(CultureInfo.InvariantCulture, currentChar));
}
}
_stringReference = new StringReference(_chars, initialPosition, endPosition - initialPosition);
string constructorName = _stringReference.ToString();
EatWhitespace(false);
if (_chars[_charPos] != '(')
throw JsonReaderException.Create(this, "Unexpected character while parsing constructor: {0}.".FormatWith(CultureInfo.InvariantCulture, _chars[_charPos]));
_charPos++;
ClearRecentString();
SetToken(JsonToken.StartConstructor, constructorName);
}
else
{
throw JsonReaderException.Create(this, "Unexpected content while parsing JSON.");
}
}
private void ParseComment()
{
// should have already parsed / character before reaching this method
_charPos++;
if (!EnsureChars(1, false) || _chars[_charPos] != '*')
throw JsonReaderException.Create(this, "Error parsing comment. Expected: *, got {0}.".FormatWith(CultureInfo.InvariantCulture, _chars[_charPos]));
else
_charPos++;
int initialPosition = _charPos;
bool commentFinished = false;
while (!commentFinished)
{
switch (_chars[_charPos])
{
case '\0':
if (_charsUsed == _charPos)
{
if (ReadData(true) == 0)
throw JsonReaderException.Create(this, "Unexpected end while parsing comment.");
}
else
{
_charPos++;
}
break;
case '*':
_charPos++;
if (EnsureChars(0, true))
{
if (_chars[_charPos] == '/')
{
_stringReference = new StringReference(_chars, initialPosition, _charPos - initialPosition - 1);
_charPos++;
commentFinished = true;
}
}
break;
case StringUtils.CarriageReturn:
ProcessCarriageReturn(true);
break;
case StringUtils.LineFeed:
ProcessLineFeed();
break;
default:
_charPos++;
break;
}
}
SetToken(JsonToken.Comment, _stringReference.ToString());
ClearRecentString();
}
private void ClearRecentString()
{
if (_buffer != null)
_buffer.Position = 0;
_stringReference = new StringReference();
}
private void ReadStringIntoBuffer(char quote)
{
int charPos = _charPos;
int initialPosition = _charPos;
int lastWritePosition = _charPos;
StringBuffer buffer = null;
while (true)
{
switch (_chars[charPos++])
{
case '\0':
if (_charsUsed == charPos - 1)
{
charPos--;
if (ReadData(true) == 0)
{
_charPos = charPos;
throw JsonReaderException.Create(this, "Unterminated string. Expected delimiter: {0}.".FormatWith(CultureInfo.InvariantCulture, quote));
}
}
break;
case '\\':
_charPos = charPos;
if (!EnsureChars(0, true))
{
_charPos = charPos;
throw JsonReaderException.Create(this, "Unterminated string. Expected delimiter: {0}.".FormatWith(CultureInfo.InvariantCulture, quote));
}
// start of escape sequence
int escapeStartPos = charPos - 1;
char currentChar = _chars[charPos];
char writeChar;
switch (currentChar)
{
case 'b':
charPos++;
writeChar = '\b';
break;
case 't':
charPos++;
writeChar = '\t';
break;
case 'n':
charPos++;
writeChar = '\n';
break;
case 'f':
charPos++;
writeChar = '\f';
break;
case 'r':
charPos++;
writeChar = '\r';
break;
case '\\':
charPos++;
writeChar = '\\';
break;
case '"':
case '\'':
case '/':
writeChar = currentChar;
charPos++;
break;
case 'u':
charPos++;
_charPos = charPos;
writeChar = ParseUnicode();
if (StringUtils.IsLowSurrogate(writeChar))
{
// low surrogate with no preceding high surrogate; this char is replaced
writeChar = UnicodeReplacementChar;
}
else if (StringUtils.IsHighSurrogate(writeChar))
{
bool anotherHighSurrogate;
// loop for handling situations where there are multiple consecutive high surrogates
do
{
anotherHighSurrogate = false;
// potential start of a surrogate pair
if (EnsureChars(2, true) && _chars[_charPos] == '\\' && _chars[_charPos + 1] == 'u')
{
char highSurrogate = writeChar;
_charPos += 2;
writeChar = ParseUnicode();
if (StringUtils.IsLowSurrogate(writeChar))
{
// a valid surrogate pair!
}
else if (StringUtils.IsHighSurrogate(writeChar))
{
// another high surrogate; replace current and start check over
highSurrogate = UnicodeReplacementChar;
anotherHighSurrogate = true;
}
else
{
// high surrogate not followed by low surrogate; original char is replaced
highSurrogate = UnicodeReplacementChar;
}
if (buffer == null)
buffer = GetBuffer();
WriteCharToBuffer(buffer, highSurrogate, lastWritePosition, escapeStartPos);
lastWritePosition = _charPos;
}
else
{
// there are not enough remaining chars for the low surrogate or is not follow by unicode sequence
// replace high surrogate and continue on as usual
writeChar = UnicodeReplacementChar;
}
} while (anotherHighSurrogate);
}
charPos = _charPos;
break;
default:
charPos++;
_charPos = charPos;
throw JsonReaderException.Create(this, "Bad JSON escape sequence: {0}.".FormatWith(CultureInfo.InvariantCulture, @"\" + currentChar));
}
if (buffer == null)
buffer = GetBuffer();
WriteCharToBuffer(buffer, writeChar, lastWritePosition, escapeStartPos);
lastWritePosition = charPos;
break;
case StringUtils.CarriageReturn:
_charPos = charPos - 1;
ProcessCarriageReturn(true);
charPos = _charPos;
break;
case StringUtils.LineFeed:
_charPos = charPos - 1;
ProcessLineFeed();
charPos = _charPos;
break;
case '"':
case '\'':
if (_chars[charPos - 1] == quote)
{
charPos--;
if (initialPosition == lastWritePosition)
{
_stringReference = new StringReference(_chars, initialPosition, charPos - initialPosition);
}
else
{
if (buffer == null)
buffer = GetBuffer();
if (charPos > lastWritePosition)
buffer.Append(_chars, lastWritePosition, charPos - lastWritePosition);
_stringReference = new StringReference(buffer.GetInternalBuffer(), 0, buffer.Position);
}
charPos++;
_charPos = charPos;
return;
}
break;
}
}
}
private void ParseUnquotedProperty()
{
int initialPosition = _charPos;
// parse unquoted property name until whitespace or colon
while (true)
{
switch (_chars[_charPos])
{
case '\0':
if (_charsUsed == _charPos)
{
if (ReadData(true) == 0)
throw JsonReaderException.Create(this, "Unexpected end while parsing unquoted property name.");
break;
}
_stringReference = new StringReference(_chars, initialPosition, _charPos - initialPosition);
return;
default:
char currentChar = _chars[_charPos];
if (ValidIdentifierChar(currentChar))
{
_charPos++;
break;
}
else if (char.IsWhiteSpace(currentChar) || currentChar == ':')
{
_stringReference = new StringReference(_chars, initialPosition, _charPos - initialPosition);
return;
}
throw JsonReaderException.Create(this, "Invalid JavaScript property identifier character: {0}.".FormatWith(CultureInfo.InvariantCulture, currentChar));
}
}
}