choo-shortcache/example/node_modules/wayfarer/index.js

choo nanocomponent cache shortcut

var assert = require('assert')
var trie = require('./trie')

module.exports = Wayfarer

// create a router
// str -> obj
function Wayfarer (dft) {
  if (!(this instanceof Wayfarer)) return new Wayfarer(dft)

  var _default = (dft || '').replace(/^\//, '')
  var _trie = trie()

  emit._trie = _trie
  emit.on = on
  emit.emit = emit
  emit.match = match
  emit._wayfarer = true

  return emit

  // define a route
  // (str, fn) -> obj
  function on (route, fn) {
    assert.equal(typeof route, 'string')
    assert.equal(typeof fn, 'function')

    var cb = fn._wayfarer && fn._trie ? fn : proxy
    route = route || '/'
    cb.route = route

    if (cb._wayfarer && cb._trie) {
      _trie.mount(route, cb._trie.trie)
    } else {
      var node = _trie.create(route)
      node.cb = cb
    }

    return emit

    function proxy () {
      return fn.apply(this, Array.prototype.slice.call(arguments))
    }
  }

  // match and call a route
  // (str, obj?) -> null
  function emit (route) {
    var matched = match(route)

    var args = new Array(arguments.length)
    args[0] = matched.params
    for (var i = 1; i < args.length; i++) {
      args[i] = arguments[i]
    }

    return matched.cb.apply(matched.cb, args)
  }

  function match (route) {
    assert.notEqual(route, undefined, "'route' must be defined")

    var matched = _trie.match(route)
    if (matched && matched.cb) return new Route(matched)

    var dft = _trie.match(_default)
    if (dft && dft.cb) return new Route(dft)

    throw new Error("route '" + route + "' did not match")
  }

  function Route (matched) {
    this.cb = matched.cb
    this.route = matched.cb.route
    this.params = matched.params
  }
}