Dynamic Json object

DynamicJson.chai

class JsonObject {
    var contents
    def JsonObject(string jsonStr) {
        this.contents = from_json(jsonStr)
    }
    
    def JsonObject(Map contents) {
        this.contents = contents
    }
    
    def has_attrib(name) {
        var c := this.contents
        if (type_name(c) == "Map") {
            var found = false
            c.for_each(fun[name, found](elem) {
                if (elem.first == name) {
                    found = true
                }
            })
            return found
        }
        else {
            return false
        }
    }
    
    def method_missing(string name, Vector v)  {
        var field := this.contents[name]
        if (field.type_name() == "Map") {
            return JsonObject(field)
        }
        else {
            return field
        }
    }
}