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https://github.com/choojs/wayfarer

:eyeglasses: composable trie based router
https://github.com/choojs/wayfarer

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:eyeglasses: composable trie based router

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README 

        
# wayfarer [![stability][0]][1]

[![npm version][2]][3] [![build status][4]][5] [![test coverage][6]][7]

[![downloads][8]][9] [![js-standard-style][10]][11]



Composable [trie based](https://en.wikipedia.org/wiki/Trie) router.  It's

faster than traditional, linear, regular expression-matching routers, although

insignficantly, and scales with the number of routes.



If you're looking for a client-side router check out

[sheet-router](https://github.com/yoshuawuyts/sheet-router). If you're looking

for a server router check out

[server-router](https://github.com/yoshuawuyts/server-router).



### features

- works with any framework

- built for speed

- minimal dependencies

- extensible



## Installation

```sh

$ npm install wayfarer

```



## Usage

```js

var wayfarer = require('wayfarer')



var router = wayfarer('/404')



router.on('/', () => console.log('/'))

router.on('/404', () => console.log('404 not found'))

router.on('/:user', (params) => console.log('user is %s', params.user))

router.on('/wildcard/*', (params) => console.log('wildcard path is %s', params.wildcard))



router('tobi')

// => 'user is tobi'



router('/uh/oh')

// => '404 not found'



router('/wildcard/example/path')

// => 'wildcard path is example/path'

```



## Subrouting

Routers can be infinitely nested, allowing routing to be scoped per view.

Matched params are passed into subrouters. Nested routes will call their

parent's default handler if no path matches.

```js

var r1 = wayfarer()

var r2 = wayfarer()



r2.on('/child', () => console.log('subrouter trix!'))

r1.on('/:parent', r2)



r1('/dada/child')

// => 'subrouter trix!'

```



## Walk

Sometimes it's necessary to walk the `trie` to apply transformations.

```js

var walk = require('wayfarer/walk')

var wayfarer = require('wayfarer')



var router = wayfarer()

router.on('/multiply', (x, y) => x * y)

router.on('/divide', (x, y) => x / y)



walk(router, (route, cb) => {

  var y = 2

  return function (params, x) {

    return cb(x, y)

  }

})



router('/multiply', 4)

// => 8

router('/divide', 8)

// => 4

```



## API

### router = wayfarer(default)

Initialize a router with a default route. Doesn't ignore querystrings and

hashes.



### router.on(route, cb(params, [arg1, ...]))

Register a new route. The order in which routes are registered does not matter.

Routes can register multiple callbacks. The callback can return values when

called.



### matchedRoute = router.match(route)

Matches a route and returns an object. The returned object contains the properties `{cb, params, route}`. This method does not invoke the callback of a route. If no route matches, the default route will be returned. If no default route matches, an error will be thrown.



### val = router(route, [arg1, ...])

Match a route and execute the corresponding callback. Alias: `router.emit()`.

Returns a values from the matched route (e.g. useful for streams). Any

additional values will be passed to the matched route.



## Internals

Wayfarer is built on an internal trie structure. If you want to build a router

using this trie structure it can be accessed through

`require('wayfarer/trie')`. It exposes the following methods:

- `trie = Trie()` - create a new trie

- `node = trie.create(route)` - create a node at a path, and return a node

- `node = trie.match(route)` - match a route on the the trie and return a node

- `trie.mount(path, trie)` - mount a trie onto a node at route



## Known issues

### multiple nested partials don't match

E.g. `/:foo/:bar/:baz` won't work. This is due `Trie.mount()` overriding child

partial paths when mounted. I'll get around to fixing this at some point in the

future, but if anyone wants to contribute a patch it'd most appreciated.



## FAQ

### Why did you build this?

Routers like [react-router](https://github.com/rackt/react-router) are

complicated solutions for a simple problem. In reality all that's needed is a

[methodless](http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html) router

that can define + match paths and can mount other routers to delegate requests.



### Why isn't my route matching?

Wayfarer only compares strings. Before you pass in an url you probably want to

strip it of querystrings and hashes using the

[pathname-match](https://github.com/yoshuawuyts/pathname-match) module.



## See Also

- [sheet-router](https://github.com/yoshuawuyts/sheet-router) - fast, modular

  client-side router

- [server-router](https://github.com/yoshuawuyts/server-router) - server router

- [hash-match](https://github.com/sethvincent/hash-match) - easy

  `window.location.hash` matching

- [pathname-match](https://github.com/yoshuawuyts/pathname-match) - strip

  querystrings and hashes from a url

- [wayfarer-to-server](https://github.com/yoshuawuyts/wayfarer-to-server) -

  Wrap wayfarer to provide HTTP method matching and `req, res` delegation



## License

[MIT](https://tldrlegal.com/license/mit-license)



[0]: https://img.shields.io/badge/stability-2%20stable-brightgreen.svg?style=flat-square

[1]: https://nodejs.org/api/documentation.html#documentation_stability_index

[2]: https://img.shields.io/npm/v/wayfarer.svg?style=flat-square

[3]: https://npmjs.org/package/wayfarer

[4]: https://img.shields.io/travis/choojs/wayfarer/master.svg?style=flat-square

[5]: https://travis-ci.org/choojs/wayfarer

[6]: https://img.shields.io/codecov/c/github/choojs/wayfarer/master.svg?style=flat-square

[7]: https://codecov.io/github/choojs/wayfarer

[8]: http://img.shields.io/npm/dm/wayfarer.svg?style=flat-square

[9]: https://npmjs.org/package/wayfarer

[10]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square

[11]: https://github.com/feross/standard

[12]: http://github.com/raynos/mercury

[13]: http://github.com/raynos/virtual-dom