/// <summary>Converts a string to a primitive value.</summary>
/// <param name="text">String text to convert.</param>
/// <param name="targetType">Type to convert string to.</param>
/// <param name="targetValue">After invocation, converted value.</param>
/// <returns>true if the value was converted; false otherwise.</returns>
internal static bool TryKeyStringToPrimitive(string text, Type targetType, out object targetValue)
{
Debug.Assert(text != null, "text != null");
Debug.Assert(targetType != null, "targetType != null");
targetType = Nullable.GetUnderlyingType(targetType) ?? targetType;
byte[] byteArrayValue;
bool binaryResult = TryKeyStringToByteArray(text, out byteArrayValue);
if (targetType == typeof(byte[]) || targetType == typeof(System.Data.Linq.Binary))
{
// The object cast is required because otherwise the compiler uses the implicit byte[]
// to Binary conversion and always returns Binary.
targetValue =
(byteArrayValue != null && targetType == typeof(System.Data.Linq.Binary)) ?
(object)new System.Data.Linq.Binary(byteArrayValue) : (object)byteArrayValue;
return(binaryResult);
}
else if (binaryResult)
{
string keyValue = Encoding.UTF8.GetString(byteArrayValue);
return(TryKeyStringToPrimitive(keyValue, targetType, out targetValue));
}
// These have separate handlers for convenience - reuse them.
else if (targetType == typeof(Guid))
{
Guid guidValue;
bool result = TryKeyStringToGuid(text, out guidValue);
targetValue = guidValue;
return(result);
}
else if (targetType == typeof(DateTime))
{
DateTime dateTimeValue;
bool result = TryKeyStringToDateTime(text, out dateTimeValue);
targetValue = dateTimeValue;
return(result);
}
bool quoted = WebConvert.IsKeyTypeQuoted(targetType);
if (quoted != WebConvert.IsKeyValueQuoted(text))
{
targetValue = null;
return(false);
}
if (quoted)
{
Debug.Assert(IsKeyValueQuoted(text), "IsKeyValueQuoted(text) - otherwise caller didn't check this before");
text = RemoveQuotes(text);
}
try
{
if (typeof(String) == targetType)
{
targetValue = text;
}
else if (typeof(Boolean) == targetType)
{
targetValue = XmlConvert.ToBoolean(text);
}
else if (typeof(Byte) == targetType)
{
targetValue = XmlConvert.ToByte(text);
}
else if (typeof(SByte) == targetType)
{
targetValue = XmlConvert.ToSByte(text);
}
else if (typeof(Int16) == targetType)
{
targetValue = XmlConvert.ToInt16(text);
}
else if (typeof(Int32) == targetType)
{
targetValue = XmlConvert.ToInt32(text);
}
else if (typeof(Int64) == targetType)
{
if (TryRemoveLiteralSuffix(XmlConstants.XmlInt64LiteralSuffix, ref text))
{
targetValue = XmlConvert.ToInt64(text);
}
else
{
targetValue = default(Int64);
return(false);
}
}
else if (typeof(Single) == targetType)
{
if (TryRemoveLiteralSuffix(XmlConstants.XmlSingleLiteralSuffix, ref text))
{
targetValue = XmlConvert.ToSingle(text);
}
else
{
targetValue = default(Single);
return(false);
}
}
else if (typeof(Double) == targetType)
{
TryRemoveLiteralSuffix(XmlConstants.XmlDoubleLiteralSuffix, ref text);
targetValue = XmlConvert.ToDouble(text);
}
else if (typeof(Decimal) == targetType)
{
if (TryRemoveLiteralSuffix(XmlConstants.XmlDecimalLiteralSuffix, ref text))
{
try
{
targetValue = XmlConvert.ToDecimal(text);
}
catch (FormatException)
{
// we need to support exponential format for decimals since we used to support them in V1
decimal result;
if (Decimal.TryParse(text, NumberStyles.Float, NumberFormatInfo.InvariantInfo, out result))
{
targetValue = result;
}
else
{
targetValue = default(Decimal);
return(false);
}
}
}
else
{
targetValue = default(Decimal);
return(false);
}
}
else
{
Debug.Assert(typeof(System.Xml.Linq.XElement) == targetType, "XElement == " + targetType);
targetValue = System.Xml.Linq.XElement.Parse(text, System.Xml.Linq.LoadOptions.PreserveWhitespace);
}
return(true);
}
catch (FormatException)
{
targetValue = null;
return(false);
}
}
private TokenId ParseFromDigit()
{
TokenId integerLiteral;
char ch = this.ch;
this.NextChar();
if (((ch == '0') && (this.ch == 'x')) || (this.ch == 'X'))
{
integerLiteral = TokenId.BinaryLiteral;
do
{
this.NextChar();
}while (WebConvert.IsCharHexDigit(this.ch));
return(integerLiteral);
}
integerLiteral = TokenId.IntegerLiteral;
while (char.IsDigit(this.ch))
{
this.NextChar();
}
if (this.ch == '.')
{
integerLiteral = TokenId.DoubleLiteral;
this.NextChar();
this.ValidateDigit();
do
{
this.NextChar();
}while (char.IsDigit(this.ch));
}
if ((this.ch == 'E') || (this.ch == 'e'))
{
integerLiteral = TokenId.DoubleLiteral;
this.NextChar();
if ((this.ch == '+') || (this.ch == '-'))
{
this.NextChar();
}
this.ValidateDigit();
do
{
this.NextChar();
}while (char.IsDigit(this.ch));
}
if ((this.ch == 'M') || (this.ch == 'm'))
{
integerLiteral = TokenId.DecimalLiteral;
this.NextChar();
return(integerLiteral);
}
if ((this.ch == 'd') || (this.ch == 'D'))
{
integerLiteral = TokenId.DoubleLiteral;
this.NextChar();
return(integerLiteral);
}
if ((this.ch == 'L') || (this.ch == 'l'))
{
integerLiteral = TokenId.Int64Literal;
this.NextChar();
return(integerLiteral);
}
if ((this.ch == 'f') || (this.ch == 'F'))
{
integerLiteral = TokenId.SingleLiteral;
this.NextChar();
}
return(integerLiteral);
}
/// <summary>Parses a token that starts with a digit.</summary>
/// <returns>The kind of token recognized.</returns>
private TokenId ParseFromDigit()
{
Debug.Assert(Char.IsDigit(this.ch), "Char.IsDigit(this.ch)");
TokenId result;
char startChar = this.ch;
this.NextChar();
if (startChar == '0' && this.ch == 'x' || this.ch == 'X')
{
result = TokenId.BinaryLiteral;
do
{
this.NextChar();
}while (WebConvert.IsCharHexDigit(this.ch));
}
else
{
result = TokenId.IntegerLiteral;
while (Char.IsDigit(this.ch))
{
this.NextChar();
}
if (this.ch == '.')
{
result = TokenId.DoubleLiteral;
this.NextChar();
this.ValidateDigit();
do
{
this.NextChar();
}while (Char.IsDigit(this.ch));
}
if (this.ch == 'E' || this.ch == 'e')
{
result = TokenId.DoubleLiteral;
this.NextChar();
if (this.ch == '+' || this.ch == '-')
{
this.NextChar();
}
this.ValidateDigit();
do
{
this.NextChar();
}while (Char.IsDigit(this.ch));
}
if (this.ch == 'M' || this.ch == 'm')
{
result = TokenId.DecimalLiteral;
this.NextChar();
}
else
if (this.ch == 'd' || this.ch == 'D')
{
result = TokenId.DoubleLiteral;
this.NextChar();
}
else if (this.ch == 'L' || this.ch == 'l')
{
result = TokenId.Int64Literal;
this.NextChar();
}
else if (this.ch == 'f' || this.ch == 'F')
{
result = TokenId.SingleLiteral;
this.NextChar();
}
}
return(result);
}