public void GetDigits_ReturnsSingleDigit()
{
var lines = separator.GetDigitsByLine(
" _ " + "\n" +
"I I" + "\n" +
"I_I"
).ToList();
lines.Should().HaveCount(1, "there's only a single line of digits in the string");
var digits = lines[0].ToList();
digits.Should().HaveCount(1, "There's only a single 3x3 cluster");
digits.Single().Should().Be(" _ I II_I");
}
/// <inheritdoc />
public List <string> Scan(string input)
=> digitSeparator.GetDigitsByLine(input)
// Transform each line by...
.Select(
line => {
// Parsing every 3x3 chunk into digits
var digitsInLine = line.Select(digit => digitScanner.Parse(digit)).ToList();
// If all digits are valid, concatenate them into a string, otherwise => null
return(digitsInLine.All(digit => digit != null)
? digitsInLine.Cast <char>().JoinToString()
: null);
})
.ToList();