proxy-pants

^{Social Media Photo by lan deng on Unsplash}

Secured and reliable Proxy based utilities for more or less common tasks:

accessor to trap one or more accessors for any object
applier & caller to trap any borrowed callback/utility without needing to use .call or .apply to pass the context
bound to bind one or more methods all at once
bread & crumbs to track operations through paths (i.e. a.b.c.d) and namespaces
cache to compute once any accessed property through a proxied, and secured, map
chain to trap once all inherited descriptors down the prototypal chain and automatically ensure the right accessor or method
dsm to virtually trap dataset / *set accessors as DOMStringMap like references per each element. Please note this utility is not secured
extender to extend any object through weakly referenced behaviors, providing a new way to deal with state machines too, through the following features:
- methods are always the same bound reference
- properties are defined per extender and never directly attached to the source
- accessors are also defined per each extender
- multiple extenders calls to the same source preserve previous state, and any source can pass through multiple extenders without ever conflicting
fetch to shortcut fetch(url).json and other methods as direct accessors, defaulting to void when the response is not ok
own to destructure only own properties
secure to ensure local classes cannot be patched at runtime down their prototypal chain
watcher the good old Object.prototype.watch and unwatch methods to simplify selective reactive state handling.
weak-cache same as cache but the returned reference is weakly retained

accessor

Trap one or more accessors for any object.

// import {accessor} from 'proxy-pants/accessor';
import {accessor} from 'proxy-pants';

const {textContent} = accessor(document.body);

// get the current body text
textContent();

// set the new one
textContent('proxy pants!');

applier & caller

Trap any borrowed callback/utility without needing to use .call or .apply to pass the context.

// import {applier, caller} from 'proxy-pants/function';
import {applier, caller} from 'proxy-pants';

const {hasOwnProperty, toString} = caller(Object.prototype);

// true
hasOwnProperty({any: 'object'}, 'any');

// [object Null]
toString(null);

const {fromCharCode} = applier(String);

const charCodes = (...args) => fromCharCode(null, args);
// <=>
charCodes(60, 61, 62);

bound

Bind one or more methods all at once.

// import {bound} from 'proxy-pants/bound';
import {bound} from 'proxy-pants';

const map = new Map;
const {get, set, has} = bound(map);

// false
has('some');

// the map
set('some', 'value');

// true
has('some');

// 'value'
get('some');

bread & crumbs

Track operations through paths (i.e. a.b.c.d) and namespaces.

// import {bread, crumbs} from 'proxy-pants/breadcrumbs';
import {bread, crumbs} from 'proxy-pants';

const namespace = {
  some: 'value',
  method(...args) {
    return this.some + args.length;
  },
  Class: class {}
};

const facade = crumbs({
  apply(path, args) {
    return bread(namespace, path)(...args);
  },
  construct(path, args) {
    const Class = bread(namespace, path);
    return new Class;
  },
  get(path, key) {
    return bread(namespace, path)[key];
  },
  has(path, key) {
    return key in bread(namespace, path);
  },
  set(path, key, value) {
    bread(namespace, path)[key] = value;
    return true;
  },
  // alias for deleteProperty(path, key) {}
  delete(path, key) {
    return delete bread(namespace, path)[key];
  }
});

facade.some;            // value
facade.method(1, 2, 3); // some3
new facade.Class;       // [object Namespace]
'some' in facade;       // true
facade.test = 'ok';
facade.test;            // ok
delete facade.test;     // true

cache

A secured Map wrapper to retrieve any property once, through the given callback.

// import {cache} from 'proxy-pants/cache';
import {cache} from 'proxy-pants';

const uids = cache((name) => (name + Math.random()));

uids.a;             // "a0.23456787654"
uids.b;             // "b0.87654334567"
uids.a === uids.a;  // true
'a' in uids;        // true
delete uids.a;      // true
'a' in uids;        // false

chain

Trap once all inherited descriptors down the prototypal chain and automatically ensure the right accessor or method.

// import {chain} from 'proxy-pants/chain';
import {chain} from 'proxy-pants';

const asNode = chain(Node);
const asElement = chain(Element);

asNode(document.createTextNode('accessor')).data;
asElement(document.body).querySelector('method');

dsm

Virtually trap dataset / *set accessors as DOMStringMap like references per each element.

// import {dsm} from 'proxy-pants/dsm';
import {dsm} from 'proxy-pants';

const {ngset: ng, vset: v} = dsm(element);

// set ng-value attribute
ng.value = 123;

// remove ng-some-thing attribute
delete ng.someThing;

// logs v-if attribute, if any
console.log(v.if);

extender

Extend any object through weakly referenced behaviors, providing a new way to deal with state machines too, through the following features:

methods are always the same bound reference
properties are defined per extender and never directly attached to the source
accessors are also defined per each extender
multiple extenders calls to the same source preserve previous state, and any source can pass through multiple extenders without ever conflicting

// import {extender} from 'proxy-pants/extender';
import {extender} from 'proxy-pants';

const Magic = extender({
  // properties are per extender and weakly related
  isMagic: true,

  // accessors context is the original source/target
  get magic() {
    // this === source
    return Magic(this).isMagic;
  },

  // methods are always same bound method reference (except init)
  hasMagic() {
    // this === source
    return $(this).magic;
  },

  // a special method that helps setting up any reference once
  // bear in mind Magic(ref).init() won't be defined as own method
  init() {
    // this is implicitly invoked only the first time Magic(this) is used
  }
});

// it can be simplified per module as ...
const $ = Magic;

const source = {};
const target = Magic(source);

target.isMagic;         // true
target.magic;           // true
target.hasMagic();      // true

// introspection
Magic.extends(source);  // true
Magic.extends(target);  // true

fetch

Shortcut for fetch(url).json or any other Response method as direct accessor.

import {fetch} from 'proxy-pants';

const data = await fetch(restAIP).json!.data;
const text = await fetch(page).text || '';

own

Destructure only own properties.

// import {own} from 'proxy-pants/own';
import {own} from 'proxy-pants';

const created = Object.create(
  {inherited: true},
  {prop: {value: true}}
);

const {inherited, prop} = own(created);

console.assert(!inherited);
console.assert(prop);

secure

Ensure local classes cannot be patched at runtime down their prototypal chain.

// import {secure} from 'proxy-pants/secure';
import {secure} from 'proxy-pants';

const {
  Map,
  WekMap
} = secure(globalThis);

// both instances now can be used without
// possible issues down the prototypal chain
const map = new Map;
const wm = new WeakMap;

watcher

The good old Object.prototype.watch and unwatch methods to simplify selective reactive state handling.

// import {watcher} from 'proxy-pants/watcher';
import {watcher} from 'proxy-pants';

const watched = watcher({a: {b: 1}});
watched.watch('c', function (prop, oldVal, newVal) {
  prop;     // 'c'
  oldVal;   // undefined
  newVal;   // 2
  this.unwatch(prop); // this is the proxied target
});
watched.c = 2;

watched.a.watch('b', console.log);
watched.a.b = 3;  // will log

weak-cache

A secured WeakValue wrapper to retrieve any property once, through the given callback, and reteain the result weakly.

// import {wcache} from 'proxy-pants/wcache';
import {wcache} from 'proxy-pants';

// the value has to be an object/reference
const uids = wcache((name) => new String((name + Math.random())));

uids.a;             // new String("a0.23456787654")
uids.b;             // new String("b0.87654334567")
uids.a === uids.a;  // true
'a' in uids;        // true
delete uids.a;      // true
'a' in uids;        // false

webreflection / proxy-pants Goto Github PK

proxy-pants's Introduction

proxy-pants

accessor

applier & caller

bound

bread & crumbs

cache

chain

dsm

extender

fetch

own

secure

watcher

weak-cache

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