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Magic is a utility library for Node.JS to provide V8 Interceptor objects in order to get the same functionality as PHP's __get and __set. Magic is designed to let developers write promise based functionality in a better syntax without function calls.
JavaScript C++
branch: master

Adding new autoloader example and readme

This demonstrates automatically loading modules with magic.

node.util.inspect(foo);
node.fs.readFile('/etc/passwd', function(){});
etc
latest commit 0220ba0f97
@aikar authored

README.markdown

Magic

About

Magic is designed to provide magic objects that have global Getters and Setters, Designed to let you write even better Promise implementations.

Magic Objects are not usable as traditional objects, but meant to be used as a tool to bridge into the gap of 'catch all' getter/setters that are not avail to V8 JS Land by default.

Magic is designed to implement similar functionality as PHP's __set and __get methods.

MagicObjects by themselves are useless, its up to you as a developer to implement them in a useful way, primarily for Promise based implementations.

Requirements

This functionality is done through V8 C++ calls and MUST BE COMPILED. If you compiled Node.JS from source, you likely already have all dependencies.

To compile the needed C++ Libraries, simply go to the folder you have installed Magic and type make makelibs. If you are a developer working on a fork of Magic, then simply type make to not have build files automatically cleaned up, speeding up subsequent compiles.

Install

Magic is ready to be installed from NPM, but may also be manually added to your project with git submodules or a clone. First CD to your project root. Ensure a directory named node_modules exists.

  • Install with NPM:

    • npm install magic
  • Install with GIT:

    • As a submodule:
      • git submodule add git://github.com/aikar/magic node_modules/magic
      • git submodule init
      • git submodule update
    • As a plain clone:
      • git clone git://github.com/aikar/magic node_modules/magic

After installing from GIT, you must compile the libraries:

  • make makelibs

NPM will automatically run that command for you.

Usage

Magic exports a single function, in which you can call passing a getter and optional setter and it will return a MagicObject. Any time a property is set or get on this object, the callback will fire instead.

  var magic = require('magic');
  magic(function (name) {
      console.log('GET', name);
  }, function (name, value) {
      console.log('SET', name, '=', value);
  });

That's all there is to it. An example of chaining:

  function configChain() {
    var requestChain = [];
    function getter(name) {
      requestChain.push(name);
      return _chain();
    }
    function setter(name, value) {
      getter(name);// add final key to chain
      var key = requestChain.join('.');
      console.log('Setting', key, 'to', value);
    }
    function _chain() {
      return magic(getter, setter);
    }
    return _chain();
  }

  configChain().foo.bar.baz.hello.world = 42;

This will cause Setting foo.bar.baz.hello.world to 42 to print to screen.

Important Note

This Object CAN NOT be used like a normal object!! If you try to set a property on the object inside of the setter, you will throw an error.

You must wrap the usage of these methods in a closure in order to store data.

Tests

Magic uses the Vows test suite. please refer to vowsjs.org for installation. To run the tests, simply type ./runTest.js from the node_modules/magic folder.

Contributing

If you would like to contribute, please fork the project on github, make changes and submit pull requests back to me.

Please follow my same coding styles (spaces, no tabs!) and add new test for new functionality.

Harmony Proxies

I've found out afterwards that this functionality is actually brought in the spec for ES5 Harmony Proxies. I will not be conforming to the Harmony Proxies spec as a module has already been written to do that.

If your wanting the full Harmony Proxy spec, then use this lib:

https://github.com/samshull/node-proxy

Magic will be a simpler and more basic implementation, however I will expand magic to do things outside of the Harmony Proxy spec too.

If you only need the basic concept of getter/setters, then Magic will do the job. If you want the extra features of Harmony Proxies, then use the above, however some of the features will likely end up in Magic too, just I want Magic to be free to expand to what ever will make it better, including features NOT part of the Harmony Proxy spec.

License

The MIT License

Copyright (c) 2011 Daniel Ennis aikar@aikar.co

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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