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avalon.router.js
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avalon.router.js
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/*********************************************************************
* History *
**********************************************************************/
//暴露如下接口：avalon.history.start, avalon.history.stop, avalon.history.interval
//avalon.Router.extend, avalon.Router.navigate
if (![].reduce) {
Array.prototype.reduce = function(fn, lastResult, scope) {
if (this.length == 0)
return lastResult;
var i = lastResult !== undefined ? 0 : 1;
var result = lastResult !== undefined ? lastResult : this[0];
for (var n = this.length; i < n; i++)
result = fn.call(scope, result, this[i], i, this);
return result;
}
}
avalon.history = new function() {
var oldIE = !"1" [0];
var started = false;
var self = this;
var iframeWin, iframe, history_hash, timeoutID;
var last_hash = "#!" + getFragment();
var supportPushState = /[native code]/.test(history.pushState);
var html = '<!doctype html><html><body>@</body></html>';
if (this.domain) {
html = html.replace("<body>", "<script>document.domain =" + this.domain + "</script><body>");
}
function createIframe() {
if (!iframe && oldIE) {
iframe = document.createElement("iframe");
iframe.tabIndex = -1;
iframe.style.display = "none"
iframe.src = "javascript:false";
(document.body || document.documentElement).appendChild(iframe);
var doc = iframe.contentDocument || iframe.contentWindow.document;
doc.write(html.replace("@", last_hash));
doc.close();
timeoutID = setInterval(poll, self.interval);
}
}
// IE6直接用location.hash取hash，可能会取少一部分内容
// 比如 http://www.cnblogs.com/rubylouvre#stream/xxxxx?lang=zh_c
// ie6 => location.hash = #stream/xxxxx
// 其他浏览器 => location.hash = #stream/xxxxx?lang=zh_c
// firefox 会自作多情对hash进行decodeURIComponent
// 又比如 http://www.cnblogs.com/rubylouvre/#!/home/q={%22thedate%22:%2220121010~20121010%22}
// firefox 15 => #!/home/q={"thedate":"20121010~20121010"}
// 其他浏览器 => #!/home/q={%22thedate%22:%2220121010~20121010%22}
function getHash(url, shim) {//用于取得当前窗口或iframe窗口的hash值
url = url || document.URL;
return url.slice(url.indexOf("#") + (~~shim));
}
function getHistory() {
return getHash(iframeWin.location);
}
function setHistory(hash, history_hash) {
if (hash !== history_hash) {//只有当新hash不等于iframe中的hash才重写
//用于产生历史
try {
var iframeDoc = getDoc();
iframeDoc.open();
iframeDoc.write(html.replace("@", hash));
iframeDoc.close();
} catch (e) {
clearInterval(timeoutID);
}
}
}
function getFragment() {
var href = location.href;
var index = href.indexOf(location.pathname.slice(1));
return href.slice(index);
}
function getDoc() {
return iframe.contentDocument || iframe.contentWindow.document;
}
function poll(e) {
if (iframe) {
var iframeDoc = getDoc(),
hash = getHash();//取得主窗口中的hash
history_hash = iframeDoc.body.innerText;//取得现在iframe中的hash
if (hash !== last_hash) {//如果是主窗口的hash发生变化
if (hash.indexOf("#!") !== 0) {
hash = "#!" + getFragment();
location.hash = hash;
}
avalon.Router.navigate(hash.split("#")[2] || "不存在");
setHistory(last_hash = hash, history_hash);
} else if (history_hash !== last_hash) {//如果按下回退键，
// avalon.log("用户点了回退键,导致iframe中的hash发生变化" + history_hash);
location.href = location.href.replace(/#.*/, '') + history_hash;
}
}
}
avalon.mix(this, {
interval: 35,
start: function(html5mode) {
if (started)
avalon.error("start已经触发过了");
started = true;
createIframe();
this.html5mode = !!html5mode;
if (window.opera || window.VBArray || !supportPushState) {
this.html5mode = false;
}
//如果我们想在改动URL时不刷新地址
// http://foo.com/bar?baz=23#bar
// http://foo.com/#!/bar?bar=23#bar
this.checkUrl = function() {
var path = getHash(getFragment(), true);
avalon.Router.navigate(path)
}
if (this.html5mode) { //如果支持pushState
//http://caniuse.com/#search=pushstate
window.addEventListener("popstate", this.checkUrl);
} else if (window.opera || document.documentMode >= 8) {
//http://caniuse.com/#search=pushstate
this.checkUrl = avalon.bind(window, "hashchange", this.checkUrl);
}
},
stop: function() {
//停止事件监听或interval
avalon.unbind(window, "popstate", this.checkUrl).unbind(window, "hashchange", this.checkUrl);
clearInterval(timeoutID);
started = false;
}
});
}
/*********************************************************************
* Router *
**********************************************************************/
new function() {
//表的结构：method+segments.length 普通字段
function _tokenize(pathStr) {
var stack = [''];
for (var i = 0; i < pathStr.length; i++) {
var chr = pathStr.charAt(i);
if (chr === '/') {//用于让后面的字符串相加
stack.push('');
continue;
} else if (chr === '(') {
stack.push('(');
stack.push('');
} else if (chr === ')') {
stack.push(')');
stack.push('');
} else {
stack[stack.length - 1] += chr;
}
}
return stack.filter(function(str) {
return str.length !== 0;
});
}
;
//将( ) 转换为数组的两端,最后构成一个多维数组返回
function _parse(tokens) {
var smallAst = [];
var token;
while ((token = tokens.shift()) !== void 0) {
if (token.length <= 0) {
continue;
}
switch (token) {
case '(':
smallAst.push(_parse(tokens));
break;
case ')':
return smallAst;
default:
smallAst.push(token);
}
}
return smallAst;
}
var combine = function(list, func) {
var first = list.shift();
var second = list.shift();
if (second === undefined) {
return first;
}
var combination = first.map(function(val1) {
return second.map(function(val2) {
return func(val1, val2);
});
}).reduce(function(val1, val2) {
return val1.concat(val2);
});
if (list.length === 0) {
return combination;
} else {
return combine([combination].concat(list), func);
}
};
function parse(rule) {
var tokens = _tokenize(rule);
var ast = _parse(tokens);
return ast;
}
function Router() {
this.routingTable = {};
}
function parseQuery(path) {
var array = path.split("#"), query = {}, tail = array[1];
if (tail) {
var index = tail.indexOf("?");
if (index > 0) {
var seg = tail.slice(index + 1).split('&'),
len = seg.length, i = 0, s;
for (; i < len; i++) {
if (!seg[i]) {
continue;
}
s = seg[i].split('=');
query[decodeURIComponent(s[0])] = decodeURIComponent(s[1]);
}
}
}
return {
pathname: array[0],
query: query
};
}
Router.prototype = {
_set: function(table, query, value) {
var nextKey = query.shift();//构建一个前缀树，用于高速匹对给定的URL
if (nextKey.length <= 0) {
avalon.error('构建失败');
}
if (nextKey.charAt && nextKey.charAt(0) === ':') {//如果碰到参数
var n = nextKey.substring(1);
if (table.hasOwnProperty('^n') && table['^n'] !== n) {
return false;
}
table['^n'] = n;
nextKey = '^v';
}
if (query.length === 0) {
table[nextKey] = value;
return true;
} else {
var nextTable = table.hasOwnProperty(nextKey) ?
table[nextKey] : table[nextKey] = {};
return this._set(nextTable, query, value);
}
},
add: function(method, path, value) {
var ast = parse(path); //转换为抽象语法树
var patterns = this._expandRules(ast);//进行全排列，应对可选的fragment
if (patterns.length === 0) {
var query = [method, 0];
this._set(this.routingTable, query, value);
} else {
var self = this
patterns.every(function(pattern) {
var length = pattern.length,
query = [method, length].concat(pattern);
return self._set(self.routingTable, query, value);
});
}
return value;
},
routeWithQuery: function(method, path) {
var parsedUrl = parseQuery(path),
ret = this.route(method, parsedUrl.pathname);
if (ret) {
ret.query = parsedUrl.query;
return ret;
}
},
route: function(method, path) {//将当前URL与
path = path.trim();
var splitted = path.split('/'),
query = Array(splitted.length),
index = 0,
params = {},
table = [],
args = [],
val, key, j;
for (var i = 0; i < splitted.length; ++i) {
val = splitted[i];
if (val.length !== 0) {
query[index] = val;
index++;
}
}
query.length = index;
table = this.routingTable[method];
if (table === void 0)
return;
table = table[query.length];
if (table === void 0)
return;
for (j = 0; j < query.length; ++j) {
key = query[j];
if (table.hasOwnProperty(key)) {
table = table[key];
} else if (table.hasOwnProperty('^v')) {
params[table['^n']] = key;
args.push(key)
table = table['^v'];
} else {
return;
}
}
return {
query: {},
args: args,
params: params,
value: table
};
},
_expandRules: function(ast) {
if (Array.isArray(ast) && ast.length === 0) {
return [];
}
var self = this;
var result = combine(ast.map(function(val) {
if (typeof val === 'string') {
return [[val]];
} else if (Array.isArray(val)) {
return self._expandRules(val).concat([[]]);
} else {
throw new Error('这里的值只能是字符串或数组 {{' + val + '}}');
}
}), function(a, b) {
return a.concat(b);
});
return result;
}
};
var callbacks = {}, errback, router = new Router();
avalon.Router = {
extend: function(obj) {//定义所有路由规则
if (typeof obj.routes === "object") {
for (var i in obj.routes) {
if (i === "*error") {
errback = obj.routes[i]
} else {
router.add("GET", i, obj.routes[i]);
}
}
}
for (var i in obj) {
if (typeof obj[i] === "function") {
callbacks[i] = obj[i];
}
}
},
navigate: function(url) {//传入一个URL，触发预定义的回调
var match = router.routeWithQuery("GET", url);
if (match) {
var key = match.value;
if (typeof callbacks[key] === "function") {
return callbacks[key].apply(match, match.args);
}
}
if (typeof callbacks[errback] === "function") {
callbacks[errback](url);
}
}
};
}