bool IsNewLine(BlockReader blockReader, LineEndings lineEndings, ICharacterReader charReader, long position, out long begin, out long end)
{
begin = -1;
end = -1;
uint v = blockReader.ReadValue(position);
if (v == LineEndings.CR)
{
begin = position;
position += blockReader.MinCodePointSize;
end = position;
if (position < blockReader.StreamLength)
{
v = blockReader.ReadValue(position);
if (v == LineEndings.LF)
{
end += blockReader.MinCodePointSize;
}
}
return(true);
}
else if (v == LineEndings.LF)
{
begin = position;
end = position + blockReader.MinCodePointSize;
position -= blockReader.MinCodePointSize;
if (position >= 0)
{
v = blockReader.ReadValue(position);
if (v == LineEndings.CR)
{
begin = position;
}
}
return(true);
}
else
{
if (charReader.TryReadCharacter(blockReader, position, v, out uint ch, out long first, out long last))
{
if (lineEndings.IsLNewLine(ch))
{
begin = blockReader.PositionFirstByte(first);
end = blockReader.PositionFirstByte(last) + blockReader.MinCodePointSize;
return(true);
}
}
}
return(false);
}
// Reserved: 0b1101_1000_0000_0000 - 0b1101_1111_1111_1111
// High surrogate: 0b1101_1000_0000_0000 - 0b1101_1011_1111_1111
// Low surrogate: 0b1101_1100_0000_0000 - 0b1101_1111_1111_1111
public bool TryReadCharacter(BlockReader blockReader, long position, out uint character, out long posFirstByte, out long posLastByte)
{
if (!(blockReader is BlockReader16))
{
throw new ArgumentException($"Type of '{nameof(blockReader)}' should be '{typeof(BlockReader16).Name}'");
}
character = 0;
posFirstByte = -1;
posLastByte = -1;
//position -= position & 0b1;
position = blockReader.PositionFirstByte(position);
if (position < 0 || position + 1 >= blockReader.StreamLength)
{
return(false);
}
uint val = blockReader.ReadValue(position);
if (val < 0b1101_1000_0000_0000 || val >= 0b1110_0000_0000_0000)
{
character = val;
posFirstByte = position;
posLastByte = position + 1;
return(true);
}
public bool TryReadCharacter(BlockReader blockReader, long position, out uint character, out long posFirstByte, out long posLastByte)
{
if (!(blockReader is BlockReader32))
{
throw new ArgumentException($"Type of '{nameof(blockReader)}' should be '{typeof(BlockReader32).Name}'");
}
character = 0;
posFirstByte = -1;
posLastByte = -1;
position = blockReader.PositionFirstByte(position);
if (position < 0 || position + 3 >= blockReader.StreamLength)
{
return(false);
}
character = blockReader.ReadValue(position);
posFirstByte = position;
posLastByte = position + 3;
return(true);
}