// if at exit of function, idx < 0, the line could not be parsed
private Tuple <int, int> parse_relative_part(string l, relative_pos part, ref int idx)
{
if (part.is_end_of_string)
{
// return remainder of the string
int at = idx;
idx = l.Length;
return(new Tuple <int, int>(at, l.Length - at));
}
int start = -1, end = -1;
if (part.start >= 0)
{
start = part.start;
}
else
{
if (idx >= l.Length)
{
// passed the end of string
return(new Tuple <int, int>(-1, -1));
}
start = l.IndexOf(part.start_str, idx);
idx = start >= 0 ? start + part.start_str.Length : -1;
if (start >= 0)
{
start += part.start_str.Length;
}
}
if (idx >= 0)
{
if (part.len >= 0)
{
end = start + part.len;
idx = end;
}
else
{
end = l.IndexOf(part.end_str, idx);
idx = end >= 0 ? end + part.end_str.Length : -1;
}
}
return(new Tuple <int, int>(start, end - start));
}
// if at exit of function, idx < 0, the line could not be parsed
private Tuple<int, int> parse_relative_part(string l, relative_pos part, ref int idx)
{
if (part.is_end_of_string) {
// return remainder of the string
int at = idx;
idx = l.Length;
return new Tuple<int, int>(at, l.Length - at);
}
int start = -1, end = -1;
if (part.start >= 0)
start = part.start;
else {
if ( idx >= l.Length)
// passed the end of string
return new Tuple<int, int>(-1, -1);
start = l.IndexOf(part.start_str, idx);
idx = start >= 0 ? start + part.start_str.Length : -1;
if (start >= 0)
start += part.start_str.Length;
}
if ( idx >= 0)
if (part.len >= 0) {
end = start + part.len;
idx = end;
} else {
end = l.IndexOf(part.end_str, idx);
idx = end >= 0 ? end + part.end_str.Length : -1;
}
return new Tuple<int, int>(start, end - start);
}
