// if at exit of function, idx < 0, the line could not be parsed
private Tuple <int, int> parse_relative_part(string l, syntax_info.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(null);
}
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
{
if (part.end_str != null)
{
end = l.IndexOf(part.end_str, idx);
}
else
{
end = l.Length;
if (part.start_str != null)
{
start -= part.start_str.Length;
}
}
idx = end >= 0 ? end + (part.end_str != null ? part.end_str.Length : 0) : -1;
}
}
return((start < l.Length && end <= l.Length) ? new Tuple <int, int>(start, end - start) : null);
}
// if at exit of function, idx < 0, the line could not be parsed
private Tuple <int, int> parse_relative_part(string l, syntax_info.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);
// 1.8.4+ - this way, I can merge a consecutive line into this one
return(new Tuple <int, int>(at, -1));
}
int start = -1, end = -1;
if (part.start >= 0)
{
start = part.start;
}
else
{
if (idx >= l.Length)
{
// passed the end of string
return(null);
}
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
{
if (part.end_str != null)
{
// 1.8.12 - care about min chars
end = l.IndexOf(part.end_str, idx + part.min_chars);
}
else
{
end = l.Length;
if (part.start_str != null)
{
start -= part.start_str.Length;
}
}
idx = end >= 0 ? end + (part.end_str != null ? part.end_str.Length : 0) : -1;
}
}
return((start < l.Length && end <= l.Length) ? new Tuple <int, int>(start, end - start) : null);
}
