public static INumberLiteral Scan(TextInputRange input)
{
var chr = input.EndChar;
if (!IsDecimalDigit(chr))
{
return(null);
}
if (chr == '0')
{
var next = input.PeekChar();
switch (next)
{
case 'x':
case 'X':
input.Extend(nChars: 2);
return(ScanNumber(input, radix: 16, isDigit: IsHexDigit));
case 'o':
case 'O':
input.Extend(nChars: 2);
return(ScanNumber(input, radix: 8, isDigit: IsOctalDigit));
case 'b':
case 'B':
input.Extend(nChars: 2);
return(ScanNumber(input, radix: 2, isDigit: IsBinaryDigit));
}
}
return(ScanDecimalNumber(input));
}
public void PeekCharEndTest()
{
var input = new TextInputRange {
File = new TextFile {
Content = "A",
Filename = ""
}
};
Assert.AreEqual(expected: '\0', actual: input.PeekChar());
}
public void PeekCharStartTest()
{
var input = new TextInputRange {
File = new TextFile {
Content = "AB",
Filename = ""
}
};
var t = input.PeekChar();
Assert.AreEqual(expected: 'B', actual: t);
}