Filter input using attribute

app.js

// Takes argument and makes sure that filtered object has attribute with that name set to true
app.filter('attribute', function() {
    return function(input, argument) {
        var output = [];

        if (argument == '') {
            return input;
        }

        for (i in input) {
            if (input[i][argument] == true) {
                output.push(input[i]);
            }
        }

        return output;
    }
});

// Multiple arguments can be passed in string, then they are parsed and checked for true/false (if attribute has '!' before its name then it's checked for false)
// Example: "archived !spam"
app.filter('attribute', function() {
    return function(input, arguments, logic) {
        var output = [];
        var parsed_arguments = arguments.split(" ");
        logic = logic || 'and';

        if (arguments == '') {
            return input;
        }

        for (i in input) {
            var allowed_count = 0;

            for (j in parsed_arguments) {
                if (parsed_arguments[j].charAt(0) === '!') {
                    var argument = parsed_arguments[j].replace('!', '');
                    if (input[i][argument] != false) {
                        allowed_count++;
                    }
                }
                else {
                    if (input[i][parsed_arguments[j]] != true) {
                        allowed_count++;
                    }
                }
            }

            if (allowed_count === 0 && logic === 'and') {
                output.push(input[i]);
            } else if (allowed_count <= 1 && logic === 'or') {
                output.push(input[i]);
            }
        }

        return output;
    }
});