@pictogrammers/element
Version:
Web Component Element for TypeScript
185 lines • 27.9 kB
JavaScript
export const addObserver = Symbol('addObserver');
export const removeObserver = Symbol('removeObserver');
export const hasObserver = Symbol('getObservers');
export const swapObserver = Symbol('swapObserver');
export const isProxy = Symbol('isProxy');
export const getTarget = Symbol('getTarget');
const arrayMutate = ['fill', 'pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'];
const observers = new Map();
export function createProxy(obj) {
return new Proxy(obj, {
get(target, prop) {
if (typeof prop === 'symbol') {
switch (prop) {
case isProxy:
return true;
case getTarget:
return target;
case hasObserver:
return (host) => {
const hosts = observers.get(obj);
return hosts?.has(host);
};
case swapObserver:
return (host, newObj) => {
const hosts = observers.get(obj);
if (hosts) {
const elements = hosts.get(host);
if (elements) {
elements.forEach((callbacks, element) => {
if (callbacks) {
const hostsNew = observers.get(newObj);
if (hostsNew) {
const elementsNew = hostsNew.get(host);
if (elementsNew) {
elementsNew.set(element, callbacks);
}
else {
hostsNew.set(host, new Map([[
element,
callbacks
]]));
}
}
else {
observers.set(newObj, new Map([[
host,
new Map([[
element,
callbacks
]])
]]));
}
}
else {
throw new Error('Unreachable');
}
elements.delete(element);
callbacks.forEach((callback) => {
callback(null, Mutation.swap, [newObj]);
});
});
}
}
};
case addObserver:
return (element, callback) => {
const host = element.getRootNode().host;
const hosts = observers.get(obj);
if (hosts) {
const elements = hosts.get(host);
if (elements) {
const callbacks = elements.get(element);
if (callbacks) {
callbacks.push(callback);
}
else {
elements.set(element, [callback]);
}
}
else {
hosts.set(host, new Map([[
element, [callback]
]]));
}
}
else {
observers.set(obj, new Map([[
host,
new Map([[
element, [callback]
]])
]]));
}
};
case removeObserver:
return (element) => {
const host = element.getRootNode().host;
const hosts = observers.get(obj);
if (hosts) {
const elements = hosts.get(host);
if (elements) {
elements.delete(element);
if (elements.size === 0) {
hosts.delete(host);
}
}
if (hosts.size === 0) {
observers.delete(obj);
}
}
};
case Symbol.iterator:
case Symbol.toPrimitive:
case Symbol.toStringTag:
return Reflect.get(target, prop);
}
throw new Error('Unsupported symbol');
}
if (prop in target) {
if (!Number.isNaN(Number(prop))) {
if (typeof target[prop] === 'object') {
return createProxy(target[prop]);
}
return target[prop];
}
if (prop === 'copyWithin') {
throw new Error('Unsupported array method copyWithin');
}
if (arrayMutate.includes(prop)) {
if (observers.has(target)) {
return function () {
const result = Array.prototype[prop].apply(target, arguments);
const hosts = observers.get(target);
hosts?.forEach((elements) => {
elements.forEach((callbacks) => {
callbacks.forEach((callback) => {
callback(target, prop, arguments);
});
});
});
return result;
};
}
return Reflect.get(target, prop);
}
if (target[prop] instanceof Array) {
return createProxy(target[prop]);
}
// nested objects do not get proxied for perf
}
return Reflect.get(target, prop);
},
set(target, prop, value) {
if (typeof prop === 'symbol') {
throw new Error('Setting symbols not allowed.');
}
if (Array.isArray(target)) {
return Reflect.set(target, prop, value);
}
if (observers.has(target)) {
const hosts = observers.get(target);
hosts?.forEach((elements) => {
elements.forEach((callbacks) => {
callbacks.forEach((callback) => {
callback(prop, value);
});
});
});
}
return Reflect.set(target, prop, value);
}
});
}
export const Mutation = {
fill: 'fill',
pop: 'pop',
push: 'push',
reverse: 'reverse',
shift: 'shift',
sort: 'sort',
splice: 'splice',
unshift: 'unshift',
swap: 'swap',
};
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const addObserver: unique symbol = Symbol('addObserver');\r\nexport const removeObserver: unique symbol = Symbol('removeObserver');\r\nexport const hasObserver: unique symbol = Symbol('getObservers');\r\nexport const swapObserver: unique symbol = Symbol('swapObserver');\r\nexport const isProxy: unique symbol = Symbol('isProxy');\r\nexport const getTarget: unique symbol = Symbol('getTarget');\r\n\r\ntype AddObserverCallback = (key?: string) => void;\r\ntype AddObserver = (host: HTMLElement, callback: AddObserverCallback) => void;\r\ntype RemoveObserver = (host: HTMLElement) => void;\r\n\r\nconst arrayMutate = ['fill', 'pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'];\r\n\r\n// key = obj                - observed object\r\n// value = Map\r\n//   key = host             - web component\r\n//   value = Map\r\n//     key = element        - forEach container or binding\r\n//     value = callback[]\r\ntype ElementMap = Map<Element, any[]>;\r\ntype HostMap = Map<Element, ElementMap>;\r\nconst observers = new Map<any, HostMap>();\r\n\r\ntype IsAny<T> = unknown extends T & string ? true : false;\r\n\r\ntype ExtrasArray<T> = {\r\n  [addObserver]: AddObserver;\r\n  [removeObserver]: RemoveObserver;\r\n  [isProxy]: boolean;\r\n} & Array<T extends (infer U)[] ? Partial<U> : object>;\r\n\r\ntype Extras = {\r\n  [addObserver]: AddObserver;\r\n  [removeObserver]: RemoveObserver;\r\n  [isProxy]: boolean;\r\n};\r\n\r\n// Short-circuit any or this is infinite\r\ntype RecursiveProxy<T> = IsAny<T> extends true\r\n  ? any\r\n  : T extends Array<any>\r\n  ? ExtrasArray<T> & {\r\n    [P in keyof T]: IsAny<T[P]> extends true ? any : RecursiveProxy<T[P]>\r\n  }\r\n  : {\r\n    [P in keyof T]: IsAny<T[P]> extends true\r\n    ? any\r\n    : T[P] extends Array<any>\r\n    ? RecursiveProxy<T[P]>\r\n    : T[P]\r\n  } & Extras;\r\n\r\nexport function createProxy<T>(obj: T): RecursiveProxy<T> {\r\n  return new Proxy(obj as any, {\r\n    get(target: any, prop: string | symbol): any {\r\n      if (typeof prop === 'symbol') {\r\n        switch (prop) {\r\n          case isProxy:\r\n            return true;\r\n          case getTarget:\r\n            return target;\r\n          case hasObserver:\r\n            return (host: HTMLElement) => {\r\n              const hosts = observers.get(obj);\r\n              return hosts?.has(host);\r\n            };\r\n          case swapObserver:\r\n            return (host: HTMLElement, newObj: any) => {\r\n              const hosts = observers.get(obj);\r\n              if (hosts) {\r\n                const elements = hosts.get(host);\r\n                if (elements) {\r\n                  elements.forEach((callbacks: any[], element) => {\r\n                    if (callbacks) {\r\n                      const hostsNew = observers.get(newObj);\r\n                      if (hostsNew) {\r\n                        const elementsNew = hostsNew.get(host);\r\n                        if (elementsNew) {\r\n                          elementsNew.set(element, callbacks);\r\n                        } else {\r\n                          hostsNew.set(\r\n                            host,\r\n                            new Map([[\r\n                              element,\r\n                              callbacks\r\n                            ]])\r\n                          );\r\n                        }\r\n                      } else {\r\n                        observers.set(\r\n                          newObj,\r\n                          new Map([[\r\n                            host,\r\n                            new Map([[\r\n                              element,\r\n                              callbacks\r\n                            ]])\r\n                          ]])\r\n                        );\r\n                      }\r\n                    } else {\r\n                      throw new Error('Unreachable');\r\n                    }\r\n                    elements.delete(element);\r\n                    callbacks.forEach((callback: any) => {\r\n                      callback(null, Mutation.swap, [newObj]);\r\n                    });\r\n                  });\r\n                }\r\n              }\r\n            }\r\n          case addObserver:\r\n            return (element: HTMLElement, callback: AddObserverCallback) => {\r\n              const host = (element.getRootNode() as ShadowRoot).host;\r\n              const hosts = observers.get(obj);\r\n              if (hosts) {\r\n                const elements = hosts.get(host);\r\n                if (elements) {\r\n                  const callbacks = elements.get(element);\r\n                  if (callbacks) {\r\n                    callbacks.push(callback);\r\n                  } else {\r\n                    elements.set(element, [callback]);\r\n                  }\r\n                } else {\r\n                  hosts.set(\r\n                    host,\r\n                    new Map([[\r\n                      element, [callback]\r\n                    ]])\r\n                  );\r\n                }\r\n              } else {\r\n                observers.set(\r\n                  obj,\r\n                  new Map([[\r\n                    host,\r\n                    new Map([[\r\n                      element, [callback]\r\n                    ]])\r\n                  ]])\r\n                );\r\n              }\r\n            };\r\n          case removeObserver:\r\n            return (element: HTMLElement) => {\r\n              const host = (element.getRootNode() as ShadowRoot).host;\r\n              const hosts = observers.get(obj);\r\n              if (hosts) {\r\n                const elements = hosts.get(host);\r\n                if (elements) {\r\n                  elements.delete(element);\r\n                  if (elements.size === 0) {\r\n                    hosts.delete(host);\r\n                  }\r\n                }\r\n                if (hosts.size === 0) {\r\n                  observers.delete(obj);\r\n                }\r\n              }\r\n            };\r\n          case Symbol.iterator:\r\n          case Symbol.toPrimitive:\r\n          case Symbol.toStringTag:\r\n            return Reflect.get(target, prop);\r\n        }\r\n        throw new Error('Unsupported symbol');\r\n      }\r\n      if (prop in target) {\r\n        if (!Number.isNaN(Number(prop))) {\r\n          if (typeof target[prop] === 'object') {\r\n            return createProxy(target[prop]);\r\n          }\r\n          return target[prop];\r\n        }\r\n        if (prop === 'copyWithin') {\r\n          throw new Error('Unsupported array method copyWithin');\r\n        }\r\n        if (arrayMutate.includes(prop)) {\r\n          if (observers.has(target)) {\r\n            return function () {\r\n              const result = Array.prototype[prop as any].apply(target, arguments);\r\n              const hosts = observers.get(target);\r\n              hosts?.forEach((elements) => {\r\n                elements.forEach((callbacks: any) => {\r\n                  callbacks.forEach((callback: any) => {\r\n                    callback(target, prop, arguments);\r\n                  });\r\n                });\r\n              });\r\n              return result;\r\n            }\r\n          }\r\n          return Reflect.get(target, prop);\r\n        }\r\n        if (target[prop] instanceof Array) {\r\n          return createProxy(target[prop]);\r\n        }\r\n        // nested objects do not get proxied for perf\r\n      }\r\n      return Reflect.get(target, prop);\r\n    },\r\n    set(target: any, prop: string | symbol, value): boolean {\r\n      if (typeof prop === 'symbol') {\r\n        throw new Error('Setting symbols not allowed.');\r\n      }\r\n      if (Array.isArray(target)) {\r\n        return Reflect.set(target, prop, value);\r\n      }\r\n      if (observers.has(target)) {\r\n        const hosts = observers.get(target);\r\n        hosts?.forEach((elements) => {\r\n          elements.forEach((callbacks: any) => {\r\n            callbacks.forEach((callback: any) => {\r\n              callback(prop, value);\r\n            });\r\n          });\r\n        });\r\n      }\r\n      return Reflect.set(target, prop, value);\r\n    }\r\n  });\r\n}\r\n\r\nexport const Mutation = {\r\n  fill: 'fill',\r\n  pop: 'pop',\r\n  push: 'push',\r\n  reverse: 'reverse',\r\n  shift: 'shift',\r\n  sort: 'sort',\r\n  splice: 'splice',\r\n  unshift: 'unshift',\r\n  swap: 'swap',\r\n};\r\n"]}