private static bool TryFormatTimeSpanT(TimeSpan value, Span <byte> buffer, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (value.Ticks < 0)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
if (!TryWriteInt32(Abs((int)value.TotalHours), buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(Abs(value.Minutes), buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
return(true);
}
public static bool TryFormat(this DateTime value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'R' || format.Symbol == 'O' || format.Symbol == 'G');
switch (format.Symbol)
{
case 'R':
var utc = value.ToUniversalTime();
if (formattingData.IsUtf16)
{
return TryFormatDateTimeRfc1123(utc, buffer, FormattingData.InvariantUtf16, out bytesWritten);
}
else
{
return TryFormatDateTimeRfc1123(utc, buffer, FormattingData.InvariantUtf8, out bytesWritten);
}
case 'O':
if (formattingData.IsUtf16)
{
return TryFormatDateTimeFormatO(value, true, buffer, FormattingData.InvariantUtf16, out bytesWritten);
}
else
{
return TryFormatDateTimeFormatO(value, true, buffer, FormattingData.InvariantUtf8, out bytesWritten);
}
case 'G':
return TryFormatDateTimeFormagG(value, buffer, formattingData, out bytesWritten);
default:
throw new NotImplementedException();
}
}
internal static bool TryFormatInt64(long value, byte numberOfBytes, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
Precondition.Require(numberOfBytes <= sizeof(long));
if (value >= 0)
{
return TryFormatUInt64(unchecked((ulong)value), numberOfBytes, buffer, format, formattingData, out bytesWritten);
}
else if (format.IsHexadecimal)
{
ulong bitMask = GetBitMask(numberOfBytes);
return TryFormatUInt64(unchecked((ulong)value) & bitMask, numberOfBytes, buffer, format, formattingData, out bytesWritten);
}
else
{
int minusSignBytes = 0;
if(!formattingData.TryWriteSymbol(FormattingData.Symbol.MinusSign, buffer, out minusSignBytes))
{
bytesWritten = 0;
return false;
}
int digitBytes = 0;
if(!TryFormatUInt64(unchecked((ulong)-value), numberOfBytes, buffer.Slice(minusSignBytes), format, formattingData, out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten = digitBytes + minusSignBytes;
return true;
}
}
// TODO: format should be ReadOnlySpan<char>
internal static bool TryFormatInt64(long value, byte numberOfBytes, Span<byte> buffer, Span<char> format, FormattingData formattingData, out int bytesWritten)
{
Precondition.Require(numberOfBytes <= sizeof(long));
Format.Parsed parsedFormat = Format.Parse(format);
return TryFormatInt64(value, numberOfBytes, buffer, parsedFormat, formattingData, out bytesWritten);
}
internal static bool TryFormatUInt64(ulong value, byte numberOfBytes, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if(format.Symbol == 'g')
{
format.Symbol = 'G';
}
if (format.IsHexadecimal && formattingData.IsUtf16) {
return TryFormatHexadecimalInvariantCultureUtf16(value, buffer, format, out bytesWritten);
}
if (format.IsHexadecimal && formattingData.IsUtf8) {
return TryFormatHexadecimalInvariantCultureUtf8(value, buffer, format, out bytesWritten);
}
if ((formattingData.IsInvariantUtf16) && (format.Symbol == 'D' || format.Symbol == 'G')) {
return TryFormatDecimalInvariantCultureUtf16(value, buffer, format, out bytesWritten);
}
if ((formattingData.IsInvariantUtf8) && (format.Symbol == 'D' || format.Symbol == 'G')) {
return TryFormatDecimalInvariantCultureUtf8(value, buffer, format, out bytesWritten);
}
return TryFormatDecimal(value, buffer, format, formattingData, out bytesWritten);
}
// Sets up cultures with digits represented by 1 or 5 'A's (0) through 1 or 5 'J's (9) and the minus sigh represented by an underscore followed by a question mark
static CustomCultureTests()
{
byte[][] utf16digitsAndSymbols = new byte[17][];
for (ushort digit = 0; digit < 10; digit++)
{
char digitChar = (char)(digit + 'A');
var digitString = new string(digitChar, 5);
utf16digitsAndSymbols[digit] = GetBytesUtf16(digitString);
}
utf16digitsAndSymbols[(ushort)FormattingData.Symbol.DecimalSeparator] = GetBytesUtf16(".");
utf16digitsAndSymbols[(ushort)FormattingData.Symbol.GroupSeparator] = GetBytesUtf16(",");
utf16digitsAndSymbols[(ushort)FormattingData.Symbol.MinusSign] = GetBytesUtf16("_?");
Culture5 = new FormattingData(utf16digitsAndSymbols, FormattingData.Encoding.Utf16);
utf16digitsAndSymbols = new byte[17][];
for (ushort digit = 0; digit < 10; digit++)
{
char digitChar = (char)(digit + 'A');
var digitString = new string(digitChar, 1);
utf16digitsAndSymbols[digit] = GetBytesUtf16(digitString);
}
utf16digitsAndSymbols[(ushort)FormattingData.Symbol.DecimalSeparator] = GetBytesUtf16(".");
utf16digitsAndSymbols[(ushort)FormattingData.Symbol.GroupSeparator] = GetBytesUtf16(",");
utf16digitsAndSymbols[(ushort)FormattingData.Symbol.MinusSign] = GetBytesUtf16("_?");
Culture1 = new FormattingData(utf16digitsAndSymbols, FormattingData.Encoding.Utf16);
}
public static bool TryFormat(this float value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'G');
return FloatFormatter.TryFormatNumber(value, true, buffer, format, formattingData, out bytesWritten);
}
static bool TryFormatDateTimeRfc1123(DateTime value, Span <byte> buffer, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (!TryWriteString(s_dayNames[(int)value.DayOfWeek], buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Day, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteString(s_monthNames[value.Month - 1], buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Year, buffer, D4, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Hour, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Minute, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Second, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteString(" GMT", buffer, formattingData, ref bytesWritten))
{
return(false);
}
return(true);
}
public static bool TryParse(Utf8String utf8Text, FormattingData cultureAndEncodingInfo, Format.Parsed numericFormat,
out ulong value, out int bytesConsumed)
{
// Precondition replacement
if (utf8Text.Length < 1)
{
value = 0;
bytesConsumed = 0;
return false;
}
value = 0;
bytesConsumed = 0;
if (cultureAndEncodingInfo.IsInvariantUtf8)
{
for (int byteIndex = 0; byteIndex < utf8Text.Length; byteIndex++)
{
byte nextByteVal = (byte)((byte)utf8Text[byteIndex] - '0');
if (nextByteVal > 9)
{
if (bytesConsumed == 0)
{
value = default(ulong);
return false;
}
else
{
return true;
}
}
else if (value > UInt64.MaxValue / 10) // overflow
{
value = 0;
bytesConsumed = 0;
return false;
}
else if (UInt64.MaxValue - value * 10 < (ulong)(nextByteVal)) // overflow
{
value = 0;
bytesConsumed = 0;
return false;
}
ulong candidate = value * 10 + nextByteVal;
value = candidate;
bytesConsumed++;
}
return true;
}
return false;
}
static bool TryWriteString(string s, Span <byte> buffer, FormattingData formattingData, ref int bytesWritten)
{
int written;
if (!s.TryFormat(buffer.Slice(bytesWritten), default(Format.Parsed), formattingData, out written))
{
bytesWritten = 0;
return(false);
}
bytesWritten += written;
return(true);
}
public bool TryFormat(Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (!PrimitiveFormatters.TryFormat(_age, buffer, format, formattingData, out bytesWritten)) return false;
char symbol = _inMonths ? 'm' : 'y';
int symbolBytes;
if (!PrimitiveFormatters.TryFormat(symbol, buffer.Slice(bytesWritten), format, formattingData, out symbolBytes)) return false;
bytesWritten += symbolBytes;
return true;
}
public static bool TryFormat(this char value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16)
{
if (buffer.Length < 2)
{
bytesWritten = 0;
return false;
}
buffer[0] = (byte)value;
buffer[1] = (byte)(value >> 8);
bytesWritten = 2;
return true;
}
if (buffer.Length < 1)
{
bytesWritten = 0;
return false;
}
// fast path for ASCII
if (value <= 127)
{
buffer[0] = (byte)value;
bytesWritten = 1;
return true;
}
// TODO: This can be directly encoded to SpanByte. There is no conversion between spans yet
var encoded = new Utf8EncodedCodePoint(value);
bytesWritten = encoded.Length;
if (buffer.Length < bytesWritten)
{
bytesWritten = 0;
return false;
}
buffer[0] = encoded.Byte0;
if(bytesWritten > 1)
{
buffer[1] = encoded.Byte1;
}
if(bytesWritten > 2)
{
buffer[2] = encoded.Byte2;
}
if(bytesWritten > 3)
{
buffer[3] = encoded.Byte3;
}
return true;
}
// it might be worth compacting the data into a single byte array.
// Also, it would be great if we could freeze it.
static FormattingData()
{
var utf16digitsAndSymbols = new byte[][] {
new byte[] { 48, 0, }, // digit 0
new byte[] { 49, 0, },
new byte[] { 50, 0, },
new byte[] { 51, 0, },
new byte[] { 52, 0, },
new byte[] { 53, 0, },
new byte[] { 54, 0, },
new byte[] { 55, 0, },
new byte[] { 56, 0, },
new byte[] { 57, 0, }, // digit 9
new byte[] { 46, 0, }, // decimal separator
new byte[] { 44, 0, }, // group separator
new byte[] { 73, 0, 110, 0, 102, 0, 105, 0, 110, 0, 105, 0, 116, 0, 121, 0, }, // Infinity
new byte[] { 45, 0, }, // minus sign
new byte[] { 43, 0, }, // plus sign
new byte[] { 78, 0, 97, 0, 78, 0, }, // NaN
new byte[] { 69, 0, }, // E
};
s_invariantUtf16 = new FormattingData(utf16digitsAndSymbols, Encoding.Utf16);
var utf8digitsAndSymbols = new byte[][] {
new byte[] { 48, },
new byte[] { 49, },
new byte[] { 50, },
new byte[] { 51, },
new byte[] { 52, },
new byte[] { 53, },
new byte[] { 54, },
new byte[] { 55, },
new byte[] { 56, },
new byte[] { 57, }, // digit 9
new byte[] { 46, }, // decimal separator
new byte[] { 44, }, // group separator
new byte[] { 73, 110, 102, 105, 110, 105, 116, 121, },
new byte[] { 45, }, // minus sign
new byte[] { 43, }, // plus sign
new byte[] { 78, 97, 78, }, // NaN
new byte[] { 69, }, // E
};
s_invariantUtf8 = new FormattingData(utf8digitsAndSymbols, Encoding.Utf8);
}
// it might be worth compacting the data into a single byte array.
// Also, it would be great if we could freeze it.
static FormattingData()
{
var utf16digitsAndSymbols = new byte[][] {
new byte[] { 48, 0, }, // digit 0
new byte[] { 49, 0, },
new byte[] { 50, 0, },
new byte[] { 51, 0, },
new byte[] { 52, 0, },
new byte[] { 53, 0, },
new byte[] { 54, 0, },
new byte[] { 55, 0, },
new byte[] { 56, 0, },
new byte[] { 57, 0, }, // digit 9
new byte[] { 46, 0, }, // decimal separator
new byte[] { 44, 0, }, // group separator
new byte[] { 73, 0, 110, 0, 102, 0, 105, 0, 110, 0, 105, 0, 116, 0, 121, 0, }, // Infinity
new byte[] { 45, 0, }, // minus sign
new byte[] { 43, 0, }, // plus sign
new byte[] { 78, 0, 97, 0, 78, 0, }, // NaN
new byte[] { 69, 0, }, // E
};
s_invariantUtf16 = new FormattingData(utf16digitsAndSymbols, Encoding.Utf16);
var utf8digitsAndSymbols = new byte[][] {
new byte[] { 48, },
new byte[] { 49, },
new byte[] { 50, },
new byte[] { 51, },
new byte[] { 52, },
new byte[] { 53, },
new byte[] { 54, },
new byte[] { 55, },
new byte[] { 56, },
new byte[] { 57, }, // digit 9
new byte[] { 46, }, // decimal separator
new byte[] { 44, }, // group separator
new byte[] { 73, 110, 102, 105, 110, 105, 116, 121, },
new byte[] { 45, }, // minus sign
new byte[] { 43, }, // plus sign
new byte[] { 78, 97, 78, }, // NaN
new byte[] { 69, }, // E
};
s_invariantUtf8 = new FormattingData(utf8digitsAndSymbols, Encoding.Utf8);
}
public static bool TryFormatNumber(double value, bool isSingle, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'E' || format.Symbol == 'F');
bytesWritten = 0;
int written;
if (Double.IsNaN(value))
{
return formattingData.TryWriteSymbol(FormattingData.Symbol.NaN, buffer, out bytesWritten);
}
if (Double.IsInfinity(value))
{
if (Double.IsNegativeInfinity(value))
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.MinusSign, buffer, out written))
{
bytesWritten = 0;
return false;
}
bytesWritten += written;
}
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.InfinitySign, buffer.Slice(bytesWritten), out written))
{
bytesWritten = 0;
return false;
}
bytesWritten += written;
return true;
}
// TODO: the lines below need to be replaced with properly implemented algorithm
// the problem is the algorithm is complex, so I am commiting a stub for now
var hack = value.ToString(format.Symbol.ToString());
return hack.TryFormat(buffer, default(Format.Parsed), formattingData, out bytesWritten);
}
public static unsafe bool TryParse(byte* utf8Text, int index, int length, FormattingData cultureAndEncodingInfo, Format.Parsed numericFormat,
out ulong value, out int bytesConsumed)
{
// Precondition replacement
if (length < 1 || index < 0)
{
value = default(ulong);
bytesConsumed = 0;
return false;
}
value = default(ulong);
bytesConsumed = 0;
if (cultureAndEncodingInfo.IsInvariantUtf8)
{
for (int byteIndex = index; byteIndex < length + index; byteIndex++)
{
byte nextByteVal = (byte)(utf8Text[byteIndex] - '0');
if (nextByteVal > 9) // if nextByteVal > 9, we know it is not a digit because any value less than '0' will overflow
// to greater than 9 since byte is an unsigned type.
{
if (bytesConsumed == 0)
{
return false;
}
else
{
return true;
}
}
else if (value > UInt64.MaxValue / 10) // overflow
{
value = default(ulong);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 6 because the max values for unsigned types all end in 5s.
else if (value == UInt64.MaxValue / 10 && nextByteVal >= 6) // overflow
{
value = default(ulong);
bytesConsumed = 0;
return false;
}
value = (ulong)(value * 10 + nextByteVal); // left shift the value and add the nextByte
bytesConsumed++; // increment the number of bytes consumed, then loop
}
return true;
}
else if (cultureAndEncodingInfo.IsInvariantUtf16)
{
for (int byteIndex = index; byteIndex < length + index - 1; byteIndex += 2) // loop through the byte array two bytes at a time for UTF-16
{
byte byteAfterNext = utf8Text[byteIndex + 1];
byte nextByteVal = (byte)(utf8Text[byteIndex] - '0');
if (nextByteVal > 9 || byteAfterNext != 0) // if the second byte isn't zero, this isn't an ASCII-equivalent code unit and we can quit here
// if nextByteVal > 9, we know it is not a digit because any value less than '0' will overflow
// to greater than 9 since byte is an unsigned type.
{
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
return true; // otherwise return true
}
}
else if (value > UInt64.MaxValue / 10)
{
value = default(ulong);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 6 because the max values for unsigned types all end in 5s.
else if (value == UInt64.MaxValue / 10 && nextByteVal >= 6) // overflow
{
value = default(ulong);
bytesConsumed = 0;
return false;
}
value = (ulong)(value * 10 + nextByteVal); // left shift the value and add the nextByte
bytesConsumed += 2;
}
return true;
}
return false;
}
static bool TryFormatDateTimeFormatO(DateTimeOffset value, bool isDateTime, Span <byte> buffer, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (!TryWriteInt32(value.Year, buffer, D4, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Month, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Day, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar('T', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Hour, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Minute, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Second, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
// add optional fractional second only if needed...
var rounded = new DateTimeOffset(value.Year, value.Month, value.Day, value.Hour, value.Minute, value.Second, TimeSpan.Zero);
var delta = value - rounded;
if (delta.Ticks != 0)
{
if (!TryWriteChar('.', buffer, formattingData, ref bytesWritten))
{
return(false);
}
var timeFrac = delta.Ticks * FractionalTimeScale / System.TimeSpan.TicksPerSecond;
if (!TryWriteInt64(timeFrac, buffer, D7, formattingData, ref bytesWritten))
{
return(false);
}
}
if (isDateTime)
{
if (!TryWriteChar('Z', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
else
{
if (!TryWriteChar('+', buffer, formattingData, ref bytesWritten))
{
return(false);
}
int bytes;
if (!value.Offset.TryFormat(buffer.Slice(bytesWritten), t, formattingData, out bytes))
{
return(false);
}
bytesWritten += bytes;
}
return(true);
}
public HttpHeaderBuffer(Span<byte> bytes, FormattingData formattingData)
{
_bytes = bytes;
_formattingData = formattingData;
}
private static bool TryFormatTimeSpanG(TimeSpan value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (value.Ticks < 0)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
bool daysWritten = false;
if (value.Days != 0 || format.Symbol == 'G')
{
if (!TryWriteInt32(Abs(value.Days), buffer, default(Format.Parsed), formattingData, ref bytesWritten))
{
return(false);
}
daysWritten = true;
if (format.Symbol == 'c')
{
if (!TryWriteChar('.', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
else
{
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
}
var hourFormat = default(Format.Parsed);
if ((daysWritten || format.Symbol == 'c') && format.Symbol != 'g')
{
hourFormat = D2;
}
if (!TryWriteInt32(Abs(value.Hours), buffer, hourFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(Abs(value.Minutes), buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(Abs(value.Seconds), buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
long remainingTicks;
if (value.Ticks != long.MinValue)
{
remainingTicks = Abs(value.Ticks) % TimeSpan.TicksPerSecond;
}
else
{
remainingTicks = long.MaxValue % TimeSpan.TicksPerSecond;
remainingTicks = (remainingTicks + 1) % TimeSpan.TicksPerSecond;
}
var ticksFormat = D7;
if (remainingTicks != 0)
{
if (!TryWriteChar('.', buffer, formattingData, ref bytesWritten))
{
return(false);
}
var fraction = remainingTicks * FractionalTimeScale / TimeSpan.TicksPerSecond;
if (!TryWriteInt64(fraction, buffer, ticksFormat, formattingData, ref bytesWritten))
{
return(false);
}
}
return(true);
}
// TODO: this whole routine is too slow. It does div and mod twice, which are both costly (especially that some JITs cannot optimize it).
// It does it twice to avoid reversing the formatted buffer, which can be tricky given it should handle arbitrary cultures.
// One optimization I thought we could do is to do div/mod once and store digits in a temp buffer (but that would allocate). Modification to the idea would be to store the digits in a local struct
// Another idea possibly worth tying would be to special case cultures that have constant digit size, and go back to the format + reverse buffer approach.
private static bool TryFormatDecimal(ulong value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if(format.IsDefault)
{
format.Symbol = 'G';
}
format.Symbol = Char.ToUpperInvariant(format.Symbol); // TODO: this is costly. I think the transformation should happen in Parse
Precondition.Require(format.Symbol == 'D' || format.Symbol == 'G' || format.Symbol == 'N');
// Reverse value on decimal basis, count digits and trailing zeros before the decimal separator
ulong reversedValueExceptFirst = 0;
var digitsCount = 1;
var trailingZerosCount = 0;
// We reverse the digits in numeric form because reversing encoded digits is hard and/or costly.
// If value contains 20 digits, its reversed value will not fit into ulong size.
// So reverse it till last digit (reversedValueExceptFirst will have all the digits except the first one).
while (value >= 10)
{
var digit = value % 10UL;
value = value / 10UL;
if (reversedValueExceptFirst == 0 && digit == 0)
{
trailingZerosCount++;
}
else
{
reversedValueExceptFirst = reversedValueExceptFirst * 10UL + digit;
digitsCount++;
}
}
bytesWritten = 0;
int digitBytes;
// If format is D and precision is greater than digitsCount + trailingZerosCount, append leading zeros
if (format.Symbol == 'D' && format.HasPrecision)
{
var leadingZerosCount = format.Precision - digitsCount - trailingZerosCount;
while (leadingZerosCount-- > 0)
{
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
}
}
// Append first digit
if (!formattingData.TryWriteDigit(value, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
digitsCount--;
if (format.Symbol == 'N')
{
const int GroupSize = 3;
// Count amount of digits before first group separator. It will be reset to groupSize every time digitsLeftInGroup == zero
var digitsLeftInGroup = (digitsCount + trailingZerosCount) % GroupSize;
if (digitsLeftInGroup == 0)
{
if (digitsCount + trailingZerosCount > 0)
{
// There is a new group immediately after the first digit
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
}
digitsLeftInGroup = GroupSize;
}
// Append digits
while (reversedValueExceptFirst > 0)
{
if (digitsLeftInGroup == 0)
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
digitsLeftInGroup = GroupSize;
}
var nextDigit = reversedValueExceptFirst % 10UL;
reversedValueExceptFirst = reversedValueExceptFirst / 10UL;
if (!formattingData.TryWriteDigit(nextDigit, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
digitsLeftInGroup--;
}
// Append trailing zeros if any
while (trailingZerosCount-- > 0)
{
if (digitsLeftInGroup == 0)
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
digitsLeftInGroup = GroupSize;
}
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
digitsLeftInGroup--;
}
}
else
{
while (reversedValueExceptFirst > 0)
{
var bufferSlice = buffer.Slice(bytesWritten);
var nextDigit = reversedValueExceptFirst % 10UL;
reversedValueExceptFirst = reversedValueExceptFirst / 10UL;
if (!formattingData.TryWriteDigit(nextDigit, bufferSlice, out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
}
// Append trailing zeros if any
while (trailingZerosCount-- > 0)
{
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
}
}
// If format is N and precision is not defined or is greater than zero, append trailing zeros after decimal point
if (format.Symbol == 'N')
{
int trailingZerosAfterDecimalCount = format.HasPrecision ? format.Precision : 2;
if (trailingZerosAfterDecimalCount > 0)
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.DecimalSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
while (trailingZerosAfterDecimalCount-- > 0)
{
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return false;
}
bytesWritten += digitBytes;
}
}
}
return true;
}
public static unsafe bool TryParse(byte* utf8Text, int index, int length, FormattingData cultureAndEncodingInfo,
Format.Parsed numericFormat, out bool value, out int bytesConsumed)
{
bytesConsumed = 0;
value = default(bool);
if (length < 1 || index < 0)
{
return false;
}
if (cultureAndEncodingInfo.IsInvariantUtf8)
{
byte firstByte = utf8Text[index];
if (firstByte == '1')
{
bytesConsumed = 1;
value = true;
return true;
}
else if (firstByte == '0')
{
bytesConsumed = 1;
value = false;
return true;
}
else if (IsTrue(utf8Text, index, length))
{
bytesConsumed = 4;
value = true;
return true;
}
else if (IsFalse(utf8Text, index, length))
{
bytesConsumed = 5;
value = false;
return true;
}
else
{
return false;
}
}
return false;
}
public static bool TryFormat(this float value, Span<byte> buffer, Span<char> format, FormattingData formattingData, out int bytesWritten)
{
Format.Parsed parsedFormat = Format.Parse(format);
return TryFormat(value, buffer, parsedFormat, formattingData, out bytesWritten);
}
public static bool TryFormat(this string value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16)
{
var valueBytes = value.Length << 1;
if (valueBytes > buffer.Length)
{
bytesWritten = 0;
return false;
}
unsafe
{
fixed (char* pCharacters = value)
{
byte* pBytes = (byte*)pCharacters;
buffer.Set(pBytes, valueBytes);
}
}
bytesWritten = valueBytes;
return true;
}
var avaliableBytes = buffer.Length;
bytesWritten = 0;
for (int i = 0; i < value.Length; i++)
{
var c = value[i];
var codepoint = (ushort)c;
if (codepoint <= 0x7f) // this if block just optimizes for ascii
{
if (bytesWritten + 1 > avaliableBytes)
{
bytesWritten = 0;
return false;
}
buffer[bytesWritten++] = (byte)codepoint;
}
else
{
Utf8EncodedCodePoint encoded;
if (!char.IsSurrogate(c))
encoded = new Utf8EncodedCodePoint(c);
else
{
if (++i >= value.Length)
throw new ArgumentException("Invalid surrogate pair.", nameof(value));
char lowSurrogate = value[i];
encoded = new Utf8EncodedCodePoint(c, lowSurrogate);
}
if (bytesWritten + encoded.Length > avaliableBytes)
{
bytesWritten = 0;
return false;
}
buffer[bytesWritten] = encoded.Byte0;
if (encoded.Length > 1)
{
buffer[bytesWritten + 1] = encoded.Byte1;
if (encoded.Length > 2)
{
buffer[bytesWritten + 2] = encoded.Byte2;
if (encoded.Length > 3)
{
buffer[bytesWritten + 3] = encoded.Byte3;
}
}
}
bytesWritten += encoded.Length;
}
}
return true;
}
public static bool TryFormat(this Utf8String value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16) {
throw new NotImplementedException();
}
if(buffer.Length < value.Length) {
bytesWritten = 0;
return false;
}
buffer.Set(value.Bytes);
bytesWritten = value.Length;
return true;
}
internal static bool TryFormatUInt64(ulong value, byte numberOfBytes, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.Symbol == 'g')
{
format.Symbol = 'G';
}
if (format.IsHexadecimal && formattingData.IsUtf16)
{
return(TryFormatHexadecimalInvariantCultureUtf16(value, buffer, format, out bytesWritten));
}
if (format.IsHexadecimal && formattingData.IsUtf8)
{
return(TryFormatHexadecimalInvariantCultureUtf8(value, buffer, format, out bytesWritten));
}
if ((formattingData.IsInvariantUtf16) && (format.Symbol == 'D' || format.Symbol == 'G'))
{
return(TryFormatDecimalInvariantCultureUtf16(value, buffer, format, out bytesWritten));
}
if ((formattingData.IsInvariantUtf8) && (format.Symbol == 'D' || format.Symbol == 'G'))
{
return(TryFormatDecimalInvariantCultureUtf8(value, buffer, format, out bytesWritten));
}
return(TryFormatDecimal(value, buffer, format, formattingData, out bytesWritten));
}
public static bool TryFormatNumber(double value, bool isSingle, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'E' || format.Symbol == 'F');
bytesWritten = 0;
int written;
if (Double.IsNaN(value))
{
return(formattingData.TryWriteSymbol(FormattingData.Symbol.NaN, buffer, out bytesWritten));
}
if (Double.IsInfinity(value))
{
if (Double.IsNegativeInfinity(value))
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.MinusSign, buffer, out written))
{
bytesWritten = 0;
return(false);
}
bytesWritten += written;
}
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.InfinitySign, buffer.Slice(bytesWritten), out written))
{
bytesWritten = 0;
return(false);
}
bytesWritten += written;
return(true);
}
// TODO: the lines below need to be replaced with properly implemented algorithm
// the problem is the algorithm is complex, so I am commiting a stub for now
var hack = value.ToString(format.Symbol.ToString());
return(hack.TryFormat(buffer, default(Format.Parsed), formattingData, out bytesWritten));
}
internal static bool TryFormatUInt64(ulong value, byte numberOfBytes, Span <byte> buffer, Span <char> format, FormattingData formattingData, out int bytesWritten)
{
Format.Parsed parsedFormat = Format.Parse(format);
return(TryFormatUInt64(value, numberOfBytes, buffer, parsedFormat, formattingData, out bytesWritten));
}
// TODO: this whole routine is too slow. It does div and mod twice, which are both costly (especially that some JITs cannot optimize it).
// It does it twice to avoid reversing the formatted buffer, which can be tricky given it should handle arbitrary cultures.
// One optimization I thought we could do is to do div/mod once and store digits in a temp buffer (but that would allocate). Modification to the idea would be to store the digits in a local struct
// Another idea possibly worth tying would be to special case cultures that have constant digit size, and go back to the format + reverse buffer approach.
private static bool TryFormatDecimal(ulong value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
format.Symbol = Char.ToUpperInvariant(format.Symbol); // TODO: this is costly. I think the transformation should happen in Parse
Precondition.Require(format.Symbol == 'D' || format.Symbol == 'G' || format.Symbol == 'N');
// Reverse value on decimal basis, count digits and trailing zeros before the decimal separator
ulong reversedValueExceptFirst = 0;
var digitsCount = 1;
var trailingZerosCount = 0;
// We reverse the digits in numeric form because reversing encoded digits is hard and/or costly.
// If value contains 20 digits, its reversed value will not fit into ulong size.
// So reverse it till last digit (reversedValueExceptFirst will have all the digits except the first one).
while (value >= 10)
{
var digit = value % 10UL;
value = value / 10UL;
if (reversedValueExceptFirst == 0 && digit == 0)
{
trailingZerosCount++;
}
else
{
reversedValueExceptFirst = reversedValueExceptFirst * 10UL + digit;
digitsCount++;
}
}
bytesWritten = 0;
int digitBytes;
// If format is D and precision is greater than digitsCount + trailingZerosCount, append leading zeros
if (format.Symbol == 'D' && format.HasPrecision)
{
var leadingZerosCount = format.Precision - digitsCount - trailingZerosCount;
while (leadingZerosCount-- > 0)
{
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
}
// Append first digit
if (!formattingData.TryWriteDigit(value, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsCount--;
if (format.Symbol == 'N')
{
const int GroupSize = 3;
// Count amount of digits before first group separator. It will be reset to groupSize every time digitsLeftInGroup == zero
var digitsLeftInGroup = (digitsCount + trailingZerosCount) % GroupSize;
if (digitsLeftInGroup == 0)
{
if (digitsCount + trailingZerosCount > 0)
{
// There is a new group immediately after the first digit
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
digitsLeftInGroup = GroupSize;
}
// Append digits
while (reversedValueExceptFirst > 0)
{
if (digitsLeftInGroup == 0)
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup = GroupSize;
}
var nextDigit = reversedValueExceptFirst % 10UL;
reversedValueExceptFirst = reversedValueExceptFirst / 10UL;
if (!formattingData.TryWriteDigit(nextDigit, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup--;
}
// Append trailing zeros if any
while (trailingZerosCount-- > 0)
{
if (digitsLeftInGroup == 0)
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup = GroupSize;
}
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup--;
}
}
else
{
while (reversedValueExceptFirst > 0)
{
var bufferSlice = buffer.Slice(bytesWritten);
var nextDigit = reversedValueExceptFirst % 10UL;
reversedValueExceptFirst = reversedValueExceptFirst / 10UL;
if (!formattingData.TryWriteDigit(nextDigit, bufferSlice, out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
// Append trailing zeros if any
while (trailingZerosCount-- > 0)
{
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
}
// If format is N and precision is not defined or is greater than zero, append trailing zeros after decimal point
if (format.Symbol == 'N')
{
int trailingZerosAfterDecimalCount = format.HasPrecision ? format.Precision : 2;
if (trailingZerosAfterDecimalCount > 0)
{
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.DecimalSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
while (trailingZerosAfterDecimalCount-- > 0)
{
if (!formattingData.TryWriteDigitOrSymbol(0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
}
}
return(true);
}
internal static bool TryFormatInt64(long value, byte numberOfBytes, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
Precondition.Require(numberOfBytes <= sizeof(long));
if (value >= 0)
{
return(TryFormatUInt64(unchecked ((ulong)value), numberOfBytes, buffer, format, formattingData, out bytesWritten));
}
else if (format.IsHexadecimal)
{
ulong bitMask = GetBitMask(numberOfBytes);
return(TryFormatUInt64(unchecked ((ulong)value) & bitMask, numberOfBytes, buffer, format, formattingData, out bytesWritten));
}
else
{
int minusSignBytes = 0;
if (!formattingData.TryWriteSymbol(FormattingData.Symbol.MinusSign, buffer, out minusSignBytes))
{
bytesWritten = 0;
return(false);
}
int digitBytes = 0;
if (!TryFormatUInt64(unchecked ((ulong)-value), numberOfBytes, buffer.Slice(minusSignBytes), format, formattingData, out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten = digitBytes + minusSignBytes;
return(true);
}
}
public static bool TryFormat(this Guid value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'D' || format.Symbol == 'N' || format.Symbol == 'B' || format.Symbol == 'P');
bool dash = true;
char tail = '\0';
bytesWritten = 0;
switch (format.Symbol)
{
case 'D':
case 'G':
break;
case 'N':
dash = false;
break;
case 'B':
if (!TryWriteChar('{', buffer, formattingData, ref bytesWritten))
{
return(false);
}
tail = '}';
break;
case 'P':
if (!TryWriteChar('(', buffer, formattingData, ref bytesWritten))
{
return(false);
}
tail = ')';
break;
default:
Precondition.Require(false); // how did we get here?
break;
}
var byteFormat = new Format.Parsed('x', 2);
unsafe
{
byte *bytes = (byte *)&value;
if (!TryWriteByte(bytes[3], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[2], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[1], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[0], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
if (!TryWriteByte(bytes[5], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[4], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
if (!TryWriteByte(bytes[7], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[6], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
if (!TryWriteByte(bytes[8], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[9], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
if (!TryWriteByte(bytes[10], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[11], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[12], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[13], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[14], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteByte(bytes[15], buffer, byteFormat, formattingData, ref bytesWritten))
{
return(false);
}
}
if (tail != '\0')
{
if (!TryWriteChar(tail, buffer, formattingData, ref bytesWritten))
{
return(false);
}
}
return(true);
}
public static bool TryFormat(this long value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
return IntegerFormatter.TryFormatInt64(value, 8, buffer, format, formattingData, out bytesWritten);
}
static bool TryFormatDateTimeFormagG(DateTime value, Span <byte> buffer, FormattingData formattingData, out int bytesWritten)
{
// for now it only works for invariant culture
if (!formattingData.IsInvariantUtf16 && !formattingData.IsInvariantUtf8)
{
throw new NotImplementedException();
}
bytesWritten = 0;
if (!TryWriteInt32(value.Month, buffer, G, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar('/', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Day, buffer, G, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar('/', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Year, buffer, G, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten))
{
return(false);
}
var hour = value.Hour;
if (hour == 0)
{
hour = 12;
}
if (hour > 12)
{
hour = hour - 12;
}
if (!TryWriteInt32(hour, buffer, G, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Minute, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteInt32(value.Second, buffer, D2, formattingData, ref bytesWritten))
{
return(false);
}
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten))
{
return(false);
}
if (value.Hour > 11)
{
TryWriteString("PM", buffer, formattingData, ref bytesWritten);
}
else
{
TryWriteString("AM", buffer, formattingData, ref bytesWritten);
}
return(true);
}
public static bool TryFormat(this long value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
return(IntegerFormatter.TryFormatInt64(value, 8, buffer, format, formattingData, out bytesWritten));
}
// TODO: format should be ReadOnlySpan<char>
internal static bool TryFormatInt64(long value, byte numberOfBytes, Span <byte> buffer, Span <char> format, FormattingData formattingData, out int bytesWritten)
{
Precondition.Require(numberOfBytes <= sizeof(long));
Format.Parsed parsedFormat = Format.Parse(format);
return(TryFormatInt64(value, numberOfBytes, buffer, parsedFormat, formattingData, out bytesWritten));
}
public static bool TryFormat(this Utf8String value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16)
{
throw new NotImplementedException();
}
if (buffer.Length < value.Length)
{
bytesWritten = 0;
return(false);
}
buffer.Set(value.Bytes);
bytesWritten = value.Length;
return(true);
}
public static bool TryFormat(this DateTime value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'R' || format.Symbol == 'O' || format.Symbol == 'G');
switch (format.Symbol)
{
case 'R':
var utc = value.ToUniversalTime();
if (formattingData.IsUtf16)
{
return(TryFormatDateTimeRfc1123(utc, buffer, FormattingData.InvariantUtf16, out bytesWritten));
}
else
{
return(TryFormatDateTimeRfc1123(utc, buffer, FormattingData.InvariantUtf8, out bytesWritten));
}
case 'O':
if (formattingData.IsUtf16)
{
return(TryFormatDateTimeFormatO(value, true, buffer, FormattingData.InvariantUtf16, out bytesWritten));
}
else
{
return(TryFormatDateTimeFormatO(value, true, buffer, FormattingData.InvariantUtf8, out bytesWritten));
}
case 'G':
return(TryFormatDateTimeFormagG(value, buffer, formattingData, out bytesWritten));
default:
throw new NotImplementedException();
}
}
static bool TryFormatDateTimeFormatO(DateTimeOffset value, bool isDateTime, Span<byte> buffer, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (!TryWriteInt32(value.Year, buffer, D4, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Month, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Day, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar('T', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Hour, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Minute, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Second, buffer, D2, formattingData, ref bytesWritten)) { return false; }
// add optional fractional second only if needed...
var rounded = new DateTimeOffset(value.Year, value.Month, value.Day, value.Hour, value.Minute, value.Second, TimeSpan.Zero);
var delta = value - rounded;
if (delta.Ticks != 0)
{
if (!TryWriteChar('.', buffer, formattingData, ref bytesWritten)) { return false; }
var timeFrac = delta.Ticks * FractionalTimeScale / System.TimeSpan.TicksPerSecond;
if (!TryWriteInt64(timeFrac, buffer, D7, formattingData, ref bytesWritten)) { return false; }
}
if (isDateTime)
{
if (!TryWriteChar('Z', buffer, formattingData, ref bytesWritten)) { return false; }
}
else
{
if (!TryWriteChar('+', buffer, formattingData, ref bytesWritten)) { return false; }
int bytes;
if (!value.Offset.TryFormat(buffer.Slice(bytesWritten), t, formattingData, out bytes)) { return false; }
bytesWritten += bytes;
}
return true;
}
public static bool TryFormat(this TimeSpan value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'c';
}
Precondition.Require(format.Symbol == 'G' || format.Symbol == 't' || format.Symbol == 'c' || format.Symbol == 'g');
if (format.Symbol != 't')
{
return(TryFormatTimeSpanG(value, buffer, format, formattingData, out bytesWritten));
}
// else it's format 't' (short time used to print time offsets)
return(TryFormatTimeSpanT(value, buffer, formattingData, out bytesWritten));
}
static bool TryFormatDateTimeRfc1123(DateTime value, Span<byte> buffer, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (!TryWriteString(s_dayNames[(int)value.DayOfWeek], buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Day, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteString(s_monthNames[value.Month - 1], buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Year, buffer, D4, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Hour, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Minute, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Second, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteString(" GMT", buffer, formattingData, ref bytesWritten)) { return false; }
return true;
}
internal static bool TryFormatUInt64(ulong value, byte numberOfBytes, Span<byte> buffer, Span<char> format, FormattingData formattingData, out int bytesWritten)
{
Format.Parsed parsedFormat = Format.Parse(format);
return TryFormatUInt64(value, numberOfBytes, buffer, parsedFormat, formattingData, out bytesWritten);
}
public static bool TryFormat(this TimeSpan value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'c';
}
Precondition.Require(format.Symbol == 'G' || format.Symbol == 't' || format.Symbol == 'c' || format.Symbol == 'g');
if (format.Symbol != 't')
{
return TryFormatTimeSpanG(value, buffer, format, formattingData, out bytesWritten);
}
// else it's format 't' (short time used to print time offsets)
return TryFormatTimeSpanT(value, buffer, formattingData, out bytesWritten);
}
public unsafe static bool TryParse(byte* utf8Text, int index, int length, FormattingData cultureAndEncodingInfo,
Format.Parsed numericFormat, out float value, out int bytesConsumed)
{
// Precondition replacement
if (length < 1 || index < 0)
{
value = 0;
bytesConsumed = 0;
return false;
}
value = 0f;
bytesConsumed = 0;
if (cultureAndEncodingInfo.IsInvariantUtf8)
{
string floatString = "";
bool decimalPlace = false, e = false, signed = false, digitLast = false, eLast = false;
if ((length) >= 3 && utf8Text[index] == 'N' && utf8Text[index + 1] == 'a' && utf8Text[index + 2] == 'N')
{
value = float.NaN;
bytesConsumed = 3;
return true;
}
if (utf8Text[index] == '-' || utf8Text[index] == '+')
{
signed = true;
floatString += (char)utf8Text[index];
index++;
bytesConsumed++;
}
if ((length - index) >= 8 && utf8Text[index] == 'I' && utf8Text[index + 1] == 'n' &&
utf8Text[index + 2] == 'f' && utf8Text[index + 3] == 'i' && utf8Text[index + 4] == 'n' &&
utf8Text[index + 5] == 'i' && utf8Text[index + 6] == 't' && utf8Text[index + 7] == 'y')
{
if (signed && utf8Text[index - 1] == '-')
{
value = float.NegativeInfinity;
}
else
{
value = float.PositiveInfinity;
}
bytesConsumed += 8;
return true;
}
for (int byteIndex = index; byteIndex < length; byteIndex++)
{
byte nextByte = utf8Text[byteIndex];
byte nextByteVal = (byte)(nextByte - '0');
if (nextByteVal > 9)
{
if (!decimalPlace && nextByte == '.')
{
if (digitLast)
{
digitLast = false;
}
if (eLast)
{
eLast = false;
}
bytesConsumed++;
decimalPlace = true;
floatString += (char)nextByte;
}
else if (!e && nextByte == 'e' || nextByte == 'E')
{
e = true;
eLast = true;
bytesConsumed++;
floatString += (char)nextByte;
}
else if (eLast && nextByte == '+' || nextByte == '-')
{
eLast = false;
bytesConsumed++;
floatString += (char)nextByte;
}
else if ((decimalPlace && signed && bytesConsumed == 2) || ((signed || decimalPlace) && bytesConsumed == 1))
{
value = 0;
bytesConsumed = 0;
return false;
}
else
{
if (float.TryParse(floatString, out value))
{
return true;
}
else
{
bytesConsumed = 0;
return false;
}
}
}
else
{
if (eLast)
eLast = false;
if (!digitLast)
digitLast = true;
bytesConsumed++;
floatString += (char)nextByte;
}
}
if ((decimalPlace && signed && bytesConsumed == 2) || ((signed || decimalPlace) && bytesConsumed == 1))
{
value = 0;
bytesConsumed = 0;
return false;
}
else
{
if (float.TryParse(floatString, out value))
{
return true;
}
else
{
bytesConsumed = 0;
return false;
}
}
}
return false;
}
private static bool TryFormatTimeSpanG(TimeSpan value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (value.Ticks < 0)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
}
bool daysWritten = false;
if (value.Days != 0 || format.Symbol == 'G')
{
if (!TryWriteInt32(Abs(value.Days), buffer, default(Format.Parsed), formattingData, ref bytesWritten)) { return false; }
daysWritten = true;
if (format.Symbol == 'c')
{
if (!TryWriteChar('.', buffer, formattingData, ref bytesWritten)) { return false; }
}
else
{
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
}
}
var hourFormat = default(Format.Parsed);
if ((daysWritten || format.Symbol == 'c') && format.Symbol != 'g')
{
hourFormat = D2;
}
if (!TryWriteInt32(Abs(value.Hours), buffer, hourFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(Abs(value.Minutes), buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(Abs(value.Seconds), buffer, D2, formattingData, ref bytesWritten)) { return false; }
long remainingTicks;
if (value.Ticks != long.MinValue)
{
remainingTicks = Abs(value.Ticks) % TimeSpan.TicksPerSecond;
}
else
{
remainingTicks = long.MaxValue % TimeSpan.TicksPerSecond;
remainingTicks = (remainingTicks + 1) % TimeSpan.TicksPerSecond;
}
var ticksFormat = D7;
if (remainingTicks != 0)
{
if (!TryWriteChar('.', buffer, formattingData, ref bytesWritten)) { return false; }
var fraction = remainingTicks * FractionalTimeScale / TimeSpan.TicksPerSecond;
if (!TryWriteInt64(fraction, buffer, ticksFormat, formattingData, ref bytesWritten)) { return false; }
}
return true;
}
public static bool TryParse(byte[] utf8Text, int index, FormattingData cultureAndEncodingInfo, Format.Parsed numericFormat,
out uint value, out int bytesConsumed)
{
// Precondition replacement
if (utf8Text.Length < 1 || index < 0 || index >= utf8Text.Length)
{
value = default(uint);
bytesConsumed = 0;
return false;
}
value = default(uint);
bytesConsumed = 0;
if (cultureAndEncodingInfo.IsInvariantUtf8)
{
for (int byteIndex = index; byteIndex < utf8Text.Length; byteIndex++) // loop through the byte array
{
byte nextByteVal = (byte)(utf8Text[byteIndex] - '0');
if (nextByteVal > 9) // if nextByteVal > 9, we know it is not a digit because any value less than '0' will overflow
// to greater than 9 since byte is an unsigned type.
{
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
return true; // otherwise return true
}
}
else if (value > UInt32.MaxValue / 10)
{
value = default(uint);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 6 because the max values for unsigned types all end in 5s.
else if (value == UInt32.MaxValue / 10 && nextByteVal >= 6) // overflow
{
value = default(uint);
bytesConsumed = 0;
return false;
}
value = (uint)(value * 10 + nextByteVal); // left shift the value and add the nextByte
bytesConsumed++;
}
return true;
}
else if (cultureAndEncodingInfo.IsInvariantUtf16)
{
for (int byteIndex = index; byteIndex < utf8Text.Length - 1; byteIndex += 2) // loop through the byte array two bytes at a time for UTF-16
{
byte byteAfterNext = utf8Text[byteIndex + 1];
byte nextByteVal = (byte)(utf8Text[byteIndex] - '0');
if (nextByteVal > 9 || byteAfterNext != 0) // if the second byte isn't zero, this isn't an ASCII-equivalent code unit and we can quit here
// if nextByteVal > 9, we know it is not a digit because any value less than '0' will overflow
// to greater than 9 since byte is an unsigned type.
{
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
return true; // otherwise return true
}
}
else if (value > UInt32.MaxValue / 10)
{
value = default(uint);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 6 because the max values for unsigned types all end in 5s.
else if (value == UInt32.MaxValue / 10 && nextByteVal >= 6) // overflow
{
value = default(uint);
bytesConsumed = 0;
return false;
}
value = (uint)(value * 10 + nextByteVal); // left shift the value and add the nextByte
bytesConsumed += 2;
}
return true;
}
else
{
int byteIndex = index;
while (byteIndex < utf8Text.Length)
{
uint result;
int oldIndex = byteIndex;
bool success = cultureAndEncodingInfo.TryParseNextCodingUnit(ref utf8Text, ref byteIndex, out result);
if (!success || result > 9)
{
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
return true; // otherwise return true
}
}
else if (value > UInt32.MaxValue / 10)
{
value = default(uint);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 6 because the max values for unsigned types all end in 5s.
else if (value == UInt32.MaxValue / 10 && result >= 6) // overflow
{
value = default(uint);
bytesConsumed = 0;
return false;
}
value = (uint)(value * 10 + result); // left shift the value and add the nextByte
bytesConsumed += byteIndex - oldIndex;
}
return true;
}
}
private static bool TryFormatTimeSpanT(TimeSpan value, Span<byte> buffer, FormattingData formattingData, out int bytesWritten)
{
bytesWritten = 0;
if (value.Ticks < 0)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
}
if (!TryWriteInt32(Abs((int)value.TotalHours), buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(Abs(value.Minutes), buffer, D2, formattingData, ref bytesWritten)) { return false; }
return true;
}
public static bool TryFormat(this Guid value, Span <byte> buffer, Span <char> format, FormattingData formattingData, out int bytesWritten)
{
Format.Parsed parsedFormat = Format.Parse(format);
return(TryFormat(value, buffer, parsedFormat, formattingData, out bytesWritten));
}
public static bool TryFormat(this string value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16)
{
var valueBytes = value.Length << 1;
if (valueBytes > buffer.Length)
{
bytesWritten = 0;
return(false);
}
unsafe
{
fixed(char *pCharacters = value)
{
byte *pBytes = (byte *)pCharacters;
buffer.Set(pBytes, valueBytes);
}
}
bytesWritten = valueBytes;
return(true);
}
var avaliableBytes = buffer.Length;
bytesWritten = 0;
for (int i = 0; i < value.Length; i++)
{
var c = value[i];
var codepoint = (ushort)c;
if (codepoint <= 0x7f) // this if block just optimizes for ascii
{
if (bytesWritten + 1 > avaliableBytes)
{
bytesWritten = 0;
return(false);
}
buffer[bytesWritten++] = (byte)codepoint;
}
else
{
Utf8EncodedCodePoint encoded;
if (!char.IsSurrogate(c))
{
encoded = new Utf8EncodedCodePoint(c);
}
else
{
if (++i >= value.Length)
{
throw new ArgumentException("Invalid surrogate pair.", nameof(value));
}
char lowSurrogate = value[i];
encoded = new Utf8EncodedCodePoint(c, lowSurrogate);
}
if (bytesWritten + encoded.Length > avaliableBytes)
{
bytesWritten = 0;
return(false);
}
buffer[bytesWritten] = encoded.Byte0;
if (encoded.Length > 1)
{
buffer[bytesWritten + 1] = encoded.Byte1;
if (encoded.Length > 2)
{
buffer[bytesWritten + 2] = encoded.Byte2;
if (encoded.Length > 3)
{
buffer[bytesWritten + 3] = encoded.Byte3;
}
}
}
bytesWritten += encoded.Length;
}
}
return(true);
}
static bool TryWriteInt64(long i, Span <byte> buffer, Format.Parsed byteFormat, FormattingData formattingData, ref int bytesWritten)
{
int written;
if (!i.TryFormat(buffer.Slice(bytesWritten), byteFormat, formattingData, out written))
{
bytesWritten = 0;
return(false);
}
bytesWritten += written;
return(true);
}
public static bool TryParse(byte[] utf8Text, int index, FormattingData cultureAndEncodingInfo, Format.Parsed numericFormat,
out int value, out int bytesConsumed)
{
// Precondition replacement
if (utf8Text.Length < 1 || index < 0 || index >= utf8Text.Length)
{
value = default(int);
bytesConsumed = 0;
return false;
}
value = default(int);
bytesConsumed = 0;
bool negative = false;
bool signed = false;
if (cultureAndEncodingInfo.IsInvariantUtf8)
{
if (utf8Text[index] == '-')
{
negative = true;
signed = true;
index++;
bytesConsumed++;
}
else if (utf8Text[index] == '+')
{
signed = true;
index++;
bytesConsumed++;
}
for (int byteIndex = index; byteIndex < utf8Text.Length; byteIndex++) // loop through the byte array
{
byte nextByteVal = (byte)(utf8Text[byteIndex] - '0');
if (nextByteVal > 9) // if nextByteVal > 9, we know it is not a digit because any value less than '0' will overflow
// to greater than 9 since byte is an unsigned type.
{
if (bytesConsumed == 1 && signed) // if the first character happened to be a '-' or a '+', we reset the byte counter so logic proceeds as normal.
{
bytesConsumed = 0;
}
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
if (negative) // We check if the value is negative at the very end to save on comp time
{
value = (int)-value;
if (value > 0)
{
value = 0;
bytesConsumed = 0;
return false;
}
}
return true; // otherwise return true
}
}
else if (value > Int32.MaxValue / 10) // overflow
{
value = default(int);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 8 because the max values for unsigned types all end in 7s.
// The min values all end in 8s, which is why that addition exists.
else if (value == Int32.MaxValue / 10 && nextByteVal >= 8 + (negative ? 1 : 0) ) // overflow
{
value = default(int);
bytesConsumed = 0;
return false;
}
value = (int)(value * 10 + nextByteVal); // parse the current digit to a int and add it to the left-shifted value
bytesConsumed++; // increment the number of bytes consumed, then loop
}
if (negative) // We check if the value is negative at the very end to save on comp time
{
value = (int)-value;
if (value > 0)
{
value = 0;
bytesConsumed = 0;
return false;
}
}
return true;
}
else if (cultureAndEncodingInfo.IsInvariantUtf16)
{
if (utf8Text[index] == '-' && utf8Text[index + 1] == 0)
{
negative = true;
signed = true;
index += 2;
bytesConsumed += 2;
}
else if (utf8Text[index] == '+' && utf8Text[index + 1] == 0)
{
signed = true;
index += 2;
bytesConsumed += 2;
}
for (int byteIndex = index; byteIndex < utf8Text.Length - 1; byteIndex += 2) // loop through the byte array two bytes at a time for UTF-16
{
byte byteAfterNext = utf8Text[byteIndex + 1];
byte nextByteVal = (byte)(utf8Text[byteIndex] - '0');
if (nextByteVal > 9 || byteAfterNext != 0) // if the second byte isn't zero, this isn't an ASCII-equivalent code unit and we can quit here
// if nextByteVal > 9, we know it is not a digit because any value less than '0' will overflow
// to greater than 9 since byte is an unsigned type.
{
if (bytesConsumed == 2 && signed) // if the first character happened to be a '-' or a '+', we reset the byte counter so logic proceeds as normal
{
bytesConsumed = 0;
}
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
if (negative) // We check if the value is negative at the very end to save on comp time
{
value = (int)-value;
if (value > 0)
{
value = 0;
bytesConsumed = 0;
return false;
}
}
return true; // otherwise return true
}
}
else if (value > Int32.MaxValue / 10) // overflow
{
value = default(int);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 8 because the max values for unsigned types all end in 7s.
// The min values all end in 8s, which is why that addition exists.
else if (value == Int32.MaxValue / 10 && nextByteVal >= 8 + (negative ? 1 : 0) ) // overflow
{
value = default(int);
bytesConsumed = 0;
return false;
}
value = (int)(value * 10 + nextByteVal); // parse the current digit to a int and add it to the left-shifted value
bytesConsumed += 2; // increment the number of bytes consumed, then loop
}
if (negative) // We check if the value is negative at the very end to save on comp time
{
value = (int)-value;
if (value > 0)
{
value = 0;
bytesConsumed = 0;
return false;
}
}
return true;
}
else
{
int byteIndex = index;
int codeUnitsConsumed = 0;
while (byteIndex < utf8Text.Length)
{
uint result;
int oldIndex = byteIndex;
bool success = cultureAndEncodingInfo.TryParseNextCodingUnit(ref utf8Text, ref byteIndex, out result);
if (!success || result > 9)
{
if (bytesConsumed == 0 && result == (int)FormattingData.Symbol.MinusSign)
{
negative = true;
signed = true;
bytesConsumed += byteIndex - oldIndex;
codeUnitsConsumed++;
}
else if (bytesConsumed == 0 && result == (int)FormattingData.Symbol.PlusSign)
{
negative = true;
signed = true;
bytesConsumed += byteIndex - oldIndex;
}
else if (codeUnitsConsumed == 1 && signed) // if the first character happened to be a '-' or a '+', we reset the byte counter so logic proceeds as normal.
{
bytesConsumed = 0;
return false;
}
else if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
return false;
}
else
{
if (negative) // We check if the value is negative at the very end to save on comp time
{
value = (int)-value;
if (value > 0)
{
value = 0;
bytesConsumed = 0;
return false;
}
}
return true; // otherwise return true
}
}
else if (value > Int32.MaxValue / 10)
{
value = default(int);
bytesConsumed = 0;
return false;
}
// This next check uses a hardcoded 8 because the max values for unsigned types all end in 7s.
// The min values all end in 8s, which is why that addition exists.
else if (value == Int32.MaxValue / 10 && result >= 8 + (negative ? 1 : 0) ) // overflow
{
value = default(int);
bytesConsumed = 0;
return false;
}
else
{
value = (int)(value * 10 + result); // left shift the value and add the nextByte
bytesConsumed += byteIndex - oldIndex;
codeUnitsConsumed++;
}
}
if (negative) // We check if the value is negative at the very end to save on comp time
{
value = (int)-value;
if (value > 0)
{
value = default(int);
bytesConsumed = 0;
return false;
}
}
return true; // otherwise return true
}
}
public static bool TryFormat(this float value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'G');
return(FloatFormatter.TryFormatNumber(value, true, buffer, format, formattingData, out bytesWritten));
}
public static bool TryFormat(this Guid value, Span<byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'D' || format.Symbol == 'N' || format.Symbol == 'B' || format.Symbol == 'P');
bool dash = true;
char tail = '\0';
bytesWritten = 0;
switch (format.Symbol)
{
case 'D':
case 'G':
break;
case 'N':
dash = false;
break;
case 'B':
if (!TryWriteChar('{', buffer, formattingData, ref bytesWritten)) { return false; }
tail = '}';
break;
case 'P':
if (!TryWriteChar('(', buffer, formattingData, ref bytesWritten)) { return false; }
tail = ')';
break;
default:
Precondition.Require(false); // how did we get here?
break;
}
var byteFormat = new Format.Parsed('x', 2);
unsafe
{
byte* bytes = (byte*)&value;
if (!TryWriteByte(bytes[3], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[2], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[1], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[0], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
}
if (!TryWriteByte(bytes[5], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[4], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
}
if (!TryWriteByte(bytes[7], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[6], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
}
if (!TryWriteByte(bytes[8], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[9], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (dash)
{
if (!TryWriteChar('-', buffer, formattingData, ref bytesWritten)) { return false; }
}
if (!TryWriteByte(bytes[10], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[11], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[12], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[13], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[14], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteByte(bytes[15], buffer, byteFormat, formattingData, ref bytesWritten)) { return false; }
}
if (tail != '\0')
{
if (!TryWriteChar(tail, buffer, formattingData, ref bytesWritten)) { return false; }
}
return true;
}
static bool TryFormatDateTimeFormagG(DateTime value, Span<byte> buffer, FormattingData formattingData, out int bytesWritten)
{
// for now it only works for invariant culture
if(!formattingData.IsInvariantUtf16 && !formattingData.IsInvariantUtf8)
{
throw new NotImplementedException();
}
bytesWritten = 0;
if (!TryWriteInt32(value.Month, buffer, G, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar('/', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Day, buffer, G, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar('/', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Year, buffer, G, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten)) { return false; }
var hour = value.Hour;
if(hour == 0)
{
hour = 12;
}
if(hour > 12)
{
hour = hour - 12;
}
if (!TryWriteInt32(hour, buffer, G, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Minute, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(':', buffer, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteInt32(value.Second, buffer, D2, formattingData, ref bytesWritten)) { return false; }
if (!TryWriteChar(' ', buffer, formattingData, ref bytesWritten)) { return false; }
if(value.Hour > 11)
{
TryWriteString("PM", buffer, formattingData, ref bytesWritten);
}
else
{
TryWriteString("AM", buffer, formattingData, ref bytesWritten);
}
return true;
}
public static bool TryFormat(this char value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16)
{
if (buffer.Length < 2)
{
bytesWritten = 0;
return(false);
}
buffer[0] = (byte)value;
buffer[1] = (byte)(value >> 8);
bytesWritten = 2;
return(true);
}
if (buffer.Length < 1)
{
bytesWritten = 0;
return(false);
}
// fast path for ASCII
if (value <= 127)
{
buffer[0] = (byte)value;
bytesWritten = 1;
return(true);
}
// TODO: This can be directly encoded to SpanByte. There is no conversion between spans yet
var encoded = new Utf8EncodedCodePoint(value);
bytesWritten = encoded.Length;
if (buffer.Length < bytesWritten)
{
bytesWritten = 0;
return(false);
}
buffer[0] = encoded.Byte0;
if (bytesWritten > 1)
{
buffer[1] = encoded.Byte1;
}
if (bytesWritten > 2)
{
buffer[2] = encoded.Byte2;
}
if (bytesWritten > 3)
{
buffer[3] = encoded.Byte3;
}
return(true);
}