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index.js
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index.js
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'use strict'
/**
* Simple client-side router
* @module riot-route
*/
import observable from 'riot-observable'
const RE_ORIGIN = /^.+?\/\/+[^\/]+/,
EVENT_LISTENER = 'EventListener',
REMOVE_EVENT_LISTENER = 'remove' + EVENT_LISTENER,
ADD_EVENT_LISTENER = 'add' + EVENT_LISTENER,
HAS_ATTRIBUTE = 'hasAttribute',
REPLACE = 'replace',
POPSTATE = 'popstate',
HASHCHANGE = 'hashchange',
TRIGGER = 'trigger',
MAX_EMIT_STACK_LEVEL = 3,
win = typeof window != 'undefined' && window,
doc = typeof document != 'undefined' && document,
hist = win && history,
loc = win && (hist.location || win.location), // see html5-history-api
prot = Router.prototype, // to minify more
clickEvent = doc && doc.ontouchstart ? 'touchstart' : 'click',
central = observable()
let
started = false,
routeFound = false,
debouncedEmit,
base,
current,
parser,
secondParser,
emitStack = [],
emitStackLevel = 0
/**
* Default parser. You can replace it via router.parser method.
* @param {string} path - current path (normalized)
* @returns {array} array
*/
function DEFAULT_PARSER(path) {
return path.split(/[/?#]/)
}
/**
* Default parser (second). You can replace it via router.parser method.
* @param {string} path - current path (normalized)
* @param {string} filter - filter string (normalized)
* @returns {array} array
*/
function DEFAULT_SECOND_PARSER(path, filter) {
const re = new RegExp('^' + filter[REPLACE](/\*/g, '([^/?#]+?)')[REPLACE](/\.\./, '.*') + '$'),
args = path.match(re)
if (args) return args.slice(1)
}
/**
* Simple/cheap debounce implementation
* @param {function} fn - callback
* @param {number} delay - delay in seconds
* @returns {function} debounced function
*/
function debounce(fn, delay) {
let t
return function () {
clearTimeout(t)
t = setTimeout(fn, delay)
}
}
/**
* Set the window listeners to trigger the routes
* @param {boolean} autoExec - see route.start
*/
function start(autoExec) {
debouncedEmit = debounce(emit, 1)
win[ADD_EVENT_LISTENER](POPSTATE, debouncedEmit)
win[ADD_EVENT_LISTENER](HASHCHANGE, debouncedEmit)
doc[ADD_EVENT_LISTENER](clickEvent, click)
if (autoExec) emit(true)
}
/**
* Router class
*/
function Router() {
this.$ = []
observable(this) // make it observable
central.on('stop', this.s.bind(this))
central.on('emit', this.e.bind(this))
}
function normalize(path) {
return path[REPLACE](/^\/|\/$/, '')
}
function isString(str) {
return typeof str == 'string'
}
/**
* Get the part after domain name
* @param {string} href - fullpath
* @returns {string} path from root
*/
function getPathFromRoot(href) {
return (href || loc.href)[REPLACE](RE_ORIGIN, '')
}
/**
* Get the part after base
* @param {string} href - fullpath
* @returns {string} path from base
*/
function getPathFromBase(href) {
return base[0] === '#'
? (href || loc.href || '').split(base)[1] || ''
: (loc ? getPathFromRoot(href) : href || '')[REPLACE](base, '')
}
function emit(force) {
// the stack is needed for redirections
const isRoot = emitStackLevel === 0
if (MAX_EMIT_STACK_LEVEL <= emitStackLevel) return
emitStackLevel++
emitStack.push(function() {
const path = getPathFromBase()
if (force || path !== current) {
central[TRIGGER]('emit', path)
current = path
}
})
if (isRoot) {
let first
while (first = emitStack.shift()) first() // stack increses within this call
emitStackLevel = 0
}
}
function click(e) {
if (
e.which !== 1 // not left click
|| e.metaKey || e.ctrlKey || e.shiftKey // or meta keys
|| e.defaultPrevented // or default prevented
) return
let el = e.target
while (el && el.nodeName !== 'A') el = el.parentNode
if (
!el || el.nodeName !== 'A' // not A tag
|| el[HAS_ATTRIBUTE]('download') // has download attr
|| !el[HAS_ATTRIBUTE]('href') // has no href attr
|| el.target && el.target !== '_self' // another window or frame
|| el.href.indexOf(loc.href.match(RE_ORIGIN)[0]) === -1 // cross origin
) return
if (el.href !== loc.href
&& (
el.href.split('#')[0] === loc.href.split('#')[0] // internal jump
|| base[0] !== '#' && getPathFromRoot(el.href).indexOf(base) !== 0 // outside of base
|| base[0] === '#' && el.href.split(base)[0] !== loc.href.split(base)[0] // outside of #base
|| !go(getPathFromBase(el.href), el.title || doc.title) // route not found
)) return
e.preventDefault()
}
/**
* Go to the path
* @param {string} path - destination path
* @param {string} title - page title
* @param {boolean} shouldReplace - use replaceState or pushState
* @returns {boolean} - route not found flag
*/
function go(path, title, shouldReplace) {
// Server-side usage: directly execute handlers for the path
if (!hist) return central[TRIGGER]('emit', getPathFromBase(path))
path = base + normalize(path)
title = title || doc.title
// browsers ignores the second parameter `title`
shouldReplace
? hist.replaceState(null, title, path)
: hist.pushState(null, title, path)
// so we need to set it manually
doc.title = title
routeFound = false
emit()
return routeFound
}
/**
* Go to path or set action
* a single string: go there
* two strings: go there with setting a title
* two strings and boolean: replace history with setting a title
* a single function: set an action on the default route
* a string/RegExp and a function: set an action on the route
* @param {(string|function)} first - path / action / filter
* @param {(string|RegExp|function)} second - title / action
* @param {boolean} third - replace flag
*/
prot.m = function(first, second, third) {
if (isString(first) && (!second || isString(second))) go(first, second, third || false)
else if (second) this.r(first, second)
else this.r('@', first)
}
/**
* Stop routing
*/
prot.s = function() {
this.off('*')
this.$ = []
}
/**
* Emit
* @param {string} path - path
*/
prot.e = function(path) {
this.$.concat('@').some(function(filter) {
const args = (filter === '@' ? parser : secondParser)(normalize(path), normalize(filter))
if (typeof args != 'undefined') {
this[TRIGGER].apply(null, [filter].concat(args))
return routeFound = true // exit from loop
}
}, this)
}
/**
* Register route
* @param {string} filter - filter for matching to url
* @param {function} action - action to register
*/
prot.r = function(filter, action) {
if (filter !== '@') {
filter = '/' + normalize(filter)
this.$.push(filter)
}
this.on(filter, action)
}
const mainRouter = new Router()
const route = mainRouter.m.bind(mainRouter)
/**
* Create a sub router
* @returns {function} the method of a new Router object
*/
route.create = function() {
const newSubRouter = new Router()
// assign sub-router's main method
const router = newSubRouter.m.bind(newSubRouter)
// stop only this sub-router
router.stop = newSubRouter.s.bind(newSubRouter)
return router
}
/**
* Set the base of url
* @param {(str|RegExp)} arg - a new base or '#' or '#!'
*/
route.base = function(arg) {
base = arg || '#'
current = getPathFromBase() // recalculate current path
}
/** Exec routing right now **/
route.exec = function() {
emit(true)
}
/**
* Replace the default router to yours
* @param {function} fn - your parser function
* @param {function} fn2 - your secondParser function
*/
route.parser = function(fn, fn2) {
if (!fn && !fn2) {
// reset parser for testing...
parser = DEFAULT_PARSER
secondParser = DEFAULT_SECOND_PARSER
}
if (fn) parser = fn
if (fn2) secondParser = fn2
}
/**
* Helper function to get url query as an object
* @returns {object} parsed query
*/
route.query = function() {
const q = {}
const href = loc.href || current
href[REPLACE](/[?&](.+?)=([^&]*)/g, function(_, k, v) { q[k] = v })
return q
}
/** Stop routing **/
route.stop = function () {
if (started) {
if (win) {
win[REMOVE_EVENT_LISTENER](POPSTATE, debouncedEmit)
win[REMOVE_EVENT_LISTENER](HASHCHANGE, debouncedEmit)
doc[REMOVE_EVENT_LISTENER](clickEvent, click)
}
central[TRIGGER]('stop')
started = false
}
}
/**
* Start routing
* @param {boolean} autoExec - automatically exec after starting if true
*/
route.start = function (autoExec) {
if (!started) {
if (win) {
if (document.readyState === 'complete') start(autoExec)
// the timeout is needed to solve
// a weird safari bug https://github.com/riot/route/issues/33
else win[ADD_EVENT_LISTENER]('load', function() {
setTimeout(function() { start(autoExec) }, 1)
})
}
started = true
}
}
/** Prepare the router **/
route.base()
route.parser()
export default route