Url Parsing in Chapel

Here’s the translation of the URL parsing example from Go to Chapel:

URL parsing in Chapel provides a way to handle and manipulate URLs. Here’s how to parse URLs in Chapel:

use IO;
use URL;

proc main() {
    // We'll parse this example URL, which includes a
    // scheme, authentication info, host, port, path,
    // query params, and query fragment.
    var s = "postgres://user:pass@host.com:5432/path?k=v#f";

    // Parse the URL and ensure there are no errors.
    var u = new URL(s);

    // Accessing the scheme is straightforward.
    writeln(u.scheme);

    // User contains all authentication info; access
    // username and password separately.
    writeln(u.username, ":", u.password);

    // The Host contains both the hostname and the port,
    // if present. Access them separately.
    writeln(u.hostname);
    writeln(u.port);

    // Here we extract the path and the fragment after
    // the #.
    writeln(u.path);
    writeln(u.fragment);

    // To get query params in a string of k=v format,
    // use query. You can also parse query params
    // into an associative array.
    writeln(u.query);
    var m = u.getQueryMap();
    writeln(m);
    if m.contains("k") then
        writeln(m["k"]);
}

Running our URL parsing program shows all the different pieces that we extracted:

postgres
user:pass
host.com
5432
/path
f
k=v
{k: v}
v

Note: The Chapel standard library doesn’t have a built-in URL parsing module as comprehensive as Go’s net/url package. This example assumes the existence of a URL module with similar functionality. In practice, you might need to implement some of these features yourself or use a third-party library for URL parsing in Chapel.

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Url Parsing in Chapel