Url Parsing in ActionScript

Here’s the translation of the URL parsing example from Go to ActionScript, formatted in Markdown suitable for Hugo:

import flash.net.URLVariables;

// URLs provide a uniform way to locate resources.
// Here's how to parse URLs in ActionScript.

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

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

    // Accessing the protocol (scheme) is straightforward.
    trace(u.protocol);

    // ActionScript doesn't have built-in support for parsing userinfo,
    // so we'll need to extract it manually.
    var userinfo:String = u.userinfo;
    var username:String = userinfo.split(":")[0];
    var password:String = userinfo.split(":")[1];
    trace(userinfo);
    trace(username);
    trace(password);

    // The host and port are easily accessible.
    trace(u.host);
    trace(u.hostname);
    trace(u.port);

    // Here we extract the path and the fragment after the #.
    trace(u.pathname);
    trace(u.hash.substr(1)); // Remove the leading #

    // To get query params, use search.
    // You can also parse query params into an object.
    trace(u.search.substr(1)); // Remove the leading ?
    var params:URLVariables = new URLVariables(u.search.substr(1));
    trace(params);
    trace(params.k);
}

// Helper class to parse URLs
class URL {
    public var protocol:String;
    public var userinfo:String;
    public var host:String;
    public var hostname:String;
    public var port:String;
    public var pathname:String;
    public var search:String;
    public var hash:String;

    public function URL(url:String):void {
        var regex:RegExp = /^(([^:/?#]+):)?(\/\/((([^:@]*):?([^:@]*))?@)?([^:/?#]*):?(\d*))?([^?#]*)(\?[^#]*)?(#.*)?/;
        var matches:Array = url.match(regex);

        this.protocol = matches[2] || "";
        this.userinfo = (matches[6] && matches[7]) ? matches[6] + ":" + matches[7] : "";
        this.host = matches[8] || "";
        this.hostname = matches[8] || "";
        this.port = matches[9] || "";
        this.pathname = matches[10] || "";
        this.search = matches[11] || "";
        this.hash = matches[12] || "";
    }
}

main();

This ActionScript code demonstrates URL parsing functionality similar to the original Go example. Here’s an explanation of the key differences and adaptations:

ActionScript doesn’t have built-in URL parsing libraries as comprehensive as Go’s net/url package. We’ve created a simple URL class to parse the URL components using a regular expression.
The userinfo (username and password) parsing is done manually since ActionScript doesn’t provide this functionality out of the box.
Instead of Go’s url.Parse(), we use our custom URL constructor to parse the URL string.
Query parameter parsing is done using ActionScript’s URLVariables class, which is similar to the map used in the Go example.
Error handling is not as explicit in this example. In a production environment, you’d want to add more robust error checking.
The trace() function is used for output instead of fmt.Println().

When running this ActionScript code, it would produce output similar to the Go example, showing the different components of the parsed URL.

Note that ActionScript is typically run in a Flash environment, so the exact method of execution may vary depending on your development setup.

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