Re: phobos and splitting things... but not with whitespace.

[simendsjo]

On Sat, 23 Jun 2012 19:52:32 +0200, Chad J  
<chadjoan@__spam.is.bad__gmail.com> wrote:


As an additional note: I could probably do this easily if I had a  
function like findSplit where the predicate is used /instead/ of a  
delimiter.  So like this:
 auto findSplit(alias pred = "a", R)(R haystack);
...
auto tuple = findSplit!(`a == "\n" || a == "\r\n" || a == "\r"`)(text);
return tuple[2];

I don't think it can match on ranges, but it's pretty trivial to implement  
something that would work for your case

import std.array, std.algorithm, std.typecons;

auto newlineSplit(string data) {
    auto rest = data.findAmong("\r\n");
    if(!rest.empty) { // found
        auto pre = data[0..data.length-rest.length];
        string match;
        if(rest.front == '\r' && (rest.length > 1 && rest[1] == '\n')) {  
// \r\n
            match = rest[0..2];
            rest = rest[2..$];
        } else { // \r or \n
            match = rest[0..1];
            rest = rest[1..$];
        }
        return tuple(pre, match, rest);
    } else {
        return tuple(data, "", "");
    }
}
unittest {
    auto text = "1\n2\r\n3\r4";
    auto res = text.newlineSplit();
    assert(res[0] == "1");
    assert(res[1] == "\n");
    assert(res[2] == "2\r\n3\r4");

    res = res[2].newlineSplit();
    assert(res[0] == "2");
    assert(res[1] == "\r\n");
    assert(res[2] == "3\r4");

    res = res[2].newlineSplit();
    assert(res[0] == "3");
    assert(res[1] == "\r");
    assert(res[2] == "4");

    res = res[2].newlineSplit();
    assert(res[0] == "4");
    assert(res[1] == "");
    assert(res[2] == "");
}