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 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 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);
}
