# Coffee-React

# STATUS: DEPRECATED

This tool is no longer maintained. If you need to transition your codebase from
it, a codemod is available to do so: [cjsx-codemod](https://github.com/jsdf/cjsx-codemod)

This project started as a way for me to explore how JSX could fit into
Coffeescript syntax, as a quickly hacked together prototype. While I never
really promoted it, it quickly took on a life of its own, and before long people
were asking for it to support all kinds of different use cases. On top of that I
had no experience writing parsers, so the result is something with 
[insurmountable limitations](https://github.com/jsdf/coffee-react/issues/32).

As I eventually stopped using Coffeescript I ended up neglecting this project,
but as people were using it I didn't want to kill it. I really should have,
however, because it meant that people were using a crappy, ill-conceived,
unmaintained tool. Now, long overdue, I'm putting it out to pasture.

Original readme follows:

Coffee-React provides a JSX-like syntax for building [React](http://facebook.github.io/react/) components with the full awesomeness of CoffeeScript.

[Try it out](https://jsdf.github.io/coffee-react-transform/).

Included is the `cjsx` executable, which is wrapper for `coffee`, using
[coffee-react-transform](https://github.com/jsdf/coffee-react-transform) and
[coffee-script](https://github.com/jashkenas/coffeescript) to transform CJSX to Javascript.
You can also `require()` CJSX components under [node](http://nodejs.org) for server-side rendering.

### Example

neat-component.cjsx
```coffee
NeatComponent = React.createClass
  render: ->
    <div className="neat-component">
      {<h1>A Component is I</h1> if @props.showTitle}
      <hr />
      {<p key={n}>This line has been printed {n} times</p> for n in [1..5]}
    </div>
```

compile it
```bash
$ cjsx -cb neat-component.cjsx
```

neat-component.js
```js
// Generated by CoffeeScript 1.9.1
var NeatComponent;

NeatComponent = React.createClass({displayName: "NeatComponent",
  render: function() {
    var n;
    return React.createElement("div", {
      "className": "neat-component"
    }, (this.props.showTitle ? React.createElement("h1", null, "A Component is I") : void 0), React.createElement("hr", null), (function() {
      var i, results;
      results = [];
      for (n = i = 1; i <= 5; n = ++i) {
        results.push(React.createElement("p", {
          "key": n
        }, "This line has been printed ", n, " times"));
      }
      return results;
    })());
  }
});
```

### Installation
```bash
npm install -g coffee-react
```

#### Version compatibility
- 5.x - React 0.13.x - 0.15.x
- 4.x - React 0.13.x - 0.14.x
- 3.x - React 0.13.x - 0.14.x
- 2.1.x - React 0.12.1
- 2.x - React 0.12
- 1.x - React 0.11.2
- 0.x - React 0.11 and below

### Usage

```
$ cjsx -h

Usage: cjsx [options] path/to/script.cjsx -- [args]

If called without options, `cjsx` will run your script.

  -b, --bare         compile without a top-level function wrapper
  -c, --compile      compile to JavaScript and save as .js files
  -e, --eval         pass a string from the command line as input
  -h, --help         display this help message
  -j, --join         concatenate the source CoffeeScript before compiling
  -m, --map          generate source map and save as .map files
  -n, --nodes        print out the parse tree that the parser produces
      --nodejs       pass options directly to the "node" binary
      --no-header    suppress the "Generated by" header
  -o, --output       set the output directory for compiled JavaScript
  -p, --print        print out the compiled JavaScript
  -s, --stdio        listen for and compile scripts over stdio
  -l, --literate     treat stdio as literate style coffee-script
  -t, --tokens       print out the tokens that the lexer/rewriter produce
  -v, --version      display the version number
  -w, --watch        watch scripts for changes and rerun commands

```

Output compiled JS to a file of the same name:
```bash
$ cjsx -c my-component.cjsx
```

#### Require .cjsx files under node
As with the `coffee-script` module, you need to register `.cjsx` with the module loader:
```coffee
require('coffee-react/register')

Component = require('./component.cjsx')

```

### Spread attributes
JSX/CJSX 'spread attributes' allow merging in an object of props when creating an element, eg:
```coffee
extraProps = color: 'red', speed: 'fast'
<div color="blue" {...extraProps} />
```
which is transformed to:
```coffee
extraProps = color: 'red', speed: 'fast'
React.createElement("div", Object.assign({"color": "blue"},  extraProps)
```

If you use this syntax in your code, be sure to include a shim for `Object.assign` for browsers/environments which don't yet support it. [object.assign](https://www.npmjs.org/package/object.assign), [core-js](https://github.com/zloirock/core-js) and 
[es6-shim](https://github.com/es-shims/es6-shim) are some possible choices.

### React.createElement

React 0.12 introduced changes to the way component descriptors are constructed, where the return value of `React.createClass` is not a descriptor factory but simply the component class itself, and descriptors must be created manually using `React.createElement` or by wrapping the component class with `React.createDescriptor`.

coffee-react-transform (and as a result, coffee-react) now outputs calls to `React.createElement` to construct element descriptors from component classes for you, so you won't need to [wrap your classes using `React.createFactory`](https://gist.github.com/sebmarkbage/ae327f2eda03bf165261). However, for this to work you will need to be using at least React 0.11.2, which adds `React.createElement`.

If you want the older style JSX output (which just desugars into function calls) then you need to use the 0.x branch, eg. 0.5.1.

Additionally, as of 1.0.0, all input files will be CJSX transformed, even if they don't have a `.cjsx` extension or `# @cjsx` pragma.

### Related projects
- [coffee-react-transform](https://github.com/jsdf/coffee-react-transform), the underlying parser/transformer package.
- [node-cjsx](https://github.com/SimonDegraeve/node-cjsx): `require` CJSX files on the server (also possible with [coffee-react/register](https://github.com/jsdf/coffee-react)).
- [coffee-reactify](https://github.com/jsdf/coffee-reactify): bundle CJSX files via [browserify](https://github.com/substack/node-browserify), see also [cjsxify](https://github.com/SimonDegraeve/cjsxify).  
- [react-coffee-quickstart](https://github.com/SimonDegraeve/react-coffee-quickstart): equivalent to [react-quickstart](https://github.com/andreypopp/react-quickstart).
- [sprockets preprocessor](https://github.com/jsdf/sprockets-coffee-react): use CJSX with Rails/Sprockets
- [ruby coffee-react gem](https://github.com/jsdf/ruby-coffee-react): transform CJSX to Coffeescript under Ruby
- [vim plugin](https://github.com/mtscout6/vim-cjsx) for syntax highlighting
- [sublime text package](https://github.com/Guidebook/sublime-cjsx) for syntax highlighting
- [mimosa plugin](https://github.com/mtscout6/mimosa-cjsx) for the mimosa build tool
- [gulp plugin](https://github.com/mtscout6/gulp-cjsx) for the gulp build tool
- [karma preprocessor](https://github.com/mtscout6/karma-cjsx-preprocessor) for karma test runner