[Issue 9045] Feature request for std.asscii => function isNewline

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9045


Nick Sabalausky <cbkbbejeap at mailinator.com> changed:

           What    |Removed                     |Added
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                 CC|                            |cbkbbejeap at mailinator.com


--- Comment #10 from Nick Sabalausky <cbkbbejeap at mailinator.com> 2013-03-26 10:04:56 PDT ---
While an 'isNewline(dchar)' func wouldn't work for reasons already discussed,
what *would* work and be very helpful IMO, is something similar to the
'std.conv.parse(...)' functions. Ie, just like this, but properly templated,
range-ified and UTF8/16-ified:

/// If 'str' starts with a Unix, Windows, Unicode or Mac9 newline, it is
/// removed from 'str' and returned. Otherwise, null is returned.
dstring parseNewline(ref dstring str)
{
    if(str.empty)
        return null;

    dstring ret;

    // Newlines are as defined in:
    // http://www.unicode.org/reports/tr18/#Line_Boundaries
    switch(str[0])
    {
    case '\r':
        if(str.length > 1 && str[1] == '\n')
        {
            ret = str[0..2];
            str = str[2..$];
            break;
        }
        goto case;

    case '\n':
    case '\f':
    case '\v':
    case '\x85':
    case paraSep:
    case lineSep:
        ret = str[0..1];
        str = str[1..$];
        break;

    default:
        ret = null;
        break;
    }

    return ret;
}

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