magix/src/tmpl/safeguard.js

view manager framewrok

let Safeguard = data => data;
if (DEBUG && window.Proxy) {
    let ProxiesPool = new Map();
    Safeguard = (data, getter, setter, root) => {
        if (G_IsPrimitive(data)) {
            return data;
        }
        let build = (prefix, o) => {
            let key = getter + '\x01' + setter;
            let cached = ProxiesPool.get(o);
            if (cached && cached.key == key) {
                return cached.entity;
            }
            if (o['\x1e_sf_\x1e']) {
                return o;
            }
            let entity = new Proxy(o, {
                set(target, property, value) {
                    if (!setter && !prefix) {
                        throw new Error('avoid writeback,key: ' + prefix + property + ' value:' + value + ' more info: https://github.com/thx/magix/issues/38');
                    }
                    target[property] = value;
                    if (setter) {
                        setter(prefix + property, value);
                    }
                    return true;
                },
                get(target, property) {
                    if (property == '\x1e_sf_\x1e') {
                        return true;
                    }
                    let out = target[property];
                    if (!prefix && getter) {
                        getter(property);
                    }
                    if (!root && G_Has(target, property) &&
                        (G_IsArray(out) || G_IsObject(out))) {
                        return build(prefix + property + '.', out);
                    }
                    return out;
                }
            });
            ProxiesPool.set(o, {
                key,
                entity
            });
            return entity;
        };
        return build('', data);
    };
}