public static IInput AdvanceMany(this IInput input, int count)
{
for (int i = 0; i < count; i++)
{
input = input.Advance();
}
return input;
}
public static IInput AdvanceAssert(this IInput input, Action<IInput, IInput> assertion)
{
var result = input.Advance();
assertion(input, result);
return result;
}
public static int AdvanceWhile(this Subject subject, char c, long max = int.MaxValue)
{
var start = subject.Index;
var index = start;
max = Math.Min(start + max, subject.Text.Length);
while (index < max && subject.Text[index] == c)
{
index += 1;
}
return index > start ? subject.Advance(index - start) : 0;
}
public static string Take(this Subject subject, int count)
{
var result = subject.Text.Substring(subject.Index, count);
subject.Advance(count);
return result;
}
public static char Take(this Subject subject)
{
if (subject.EndOfString)
{
return char.MinValue;
}
var result = subject.Char;
subject.Advance();
return result;
}
public static int AdvanceWhileNot(this Subject subject, Func<char, bool> predicate, long max = int.MaxValue)
{
var start = subject.Index;
var index = start;
max = Math.Min(start + max, subject.Text.Length);
while (index < max && !predicate(subject.Text[index]))
{
index += 1;
}
return index > start ? subject.Advance(index - start) : 0;
}
