// ==UserScript==
// @name        UserScript Translation Engine
// @namespace   org.jixun.us.translation
// @description Translate strings by given translations
// @version     1.0
// @run-at      document-start
// @grant       none
// ==/UserScript==
var Translation = (function () {
var _each = function (arr, eachCb, defValue) {
if (!arr || !arr.length) return ;
for (var i = arr.length, ret; i-- ; )
// If there's something to return, then return it.
if (ret = eachCb (arr[i], i))
return ret;
return defValue ;
};
var _filterPop = function (arr, fn) {
if (arr && arr.length)
for (var i = arr.length; i--; )
if (fn(arr[i]))
return arr[i];
};
var extend = function (src) {
var args = arguments, argl = args.length;
for (var i = 1; i < argl; i++) {
for (var x in args[i]) {
if (args[i].hasOwnProperty(x)) {
if (src[x] instanceof Object) {
extend (src[x], args[i][x]);
} else {
src[x] = args[i][x];
}
}
}
}
return src;
};
var Translation = function (lang) {
this.resetLang ();
this.setLang (lang);
};
// 获取浏览器预设语言
Translation.getLang = function (lang) {
var x = _filterPop(navigator.languages.slice().reverse(), function (x) { return lang[x] });
return lang[x] || {};
};
Translation.prototype = {
run: function (node) {
var self = this;
node = node || document.body || document;
this.mo = new MutationObserver (function (m) {
_each (m, function (q) {
_each (q.addedNodes, function (e) {
// Firebug keep injects their stuff, ignore
if (e.className && e.className.indexOf ('firebug') != -1)
return ;
self.translateNode (e);
});
if (q.type == 'attributes') {
var x = self.findAttrTranslation (q.target, q.attributeName, q.target.getAttribute(q.attributeName));
if (x) {
q.target.setAttribute (q.attributeName, x);
}
}
});
});
this.mo.observe (node, {
childList: true,
subtree: true,
characterData: true,
attributes: true
});
this.translateNode (node);
},
excludeTags: ['code', 'pre', 'script', 'style', 'link', 'meta'],
excludeFromTag: function (node, tagName) {
var n = node;
while (n = n.parentNode)
if (-1 != this.excludeTags.indexOf(n))
return true;
return false;
},
translateNode: function (node) {
_each(node.getElementsByTagName('*'), this.applyAttr.bind(this));
var self = this;
var walker = document.createTreeWalker (node, 4 /* NodeFilter.SHOW_TEXT */, function (textNode) {
return (
self.excludeFromTag(textNode.parentNode)
|| textNode.nodeValue.trim() === ''
? 2 /* NodeFilter.FILTER_REJECT */
: 1 /* NodeFilter.FILTER_ACCEPT */
);
}, false);
// Loop through text nodes.
while (node = walker.nextNode())
this.applyNode (node);
},
applyNode: function (node) {
this.applyText (node);
this.applyAttr (node.parentNode);
},
findTranslation: function (lang, str) {
var args = arguments;
var stack = [ lang ];
var r = lang;
for (var i = 2; i < args.length; i++) {
r = r[args[i]];
if (!r) break;
stack.push (r);
}
if (stack.length) {
for (i = stack.length; i--; ) {
if (stack[i][str] && 'string' == typeof stack[i][str]) {
return stack[i][str];
}
if (stack[i].regex) {
r = _filterPop(stack[i].regex, function (re) {
return re[0].test( str );
});
if (r) return str.replace(r[0], r[1]);
}
}
}
},
applyText: function (node) {
var self = this;
var v = node.nodeValue.trim();
if (!v) return ;
var l = (this.findTranslation (this.lang.node, v, 'tag', node.parentNode.tagName)
||	this.findTranslation (this.lang.node, v, 'str'));
if (l) node.nodeValue = l;
},
findAttrTranslation: function (node, attrName, attrVal) {
return (this.findTranslation (this.lang.attr, attrVal, 'tag', node.tagName, attrName)
|| this.findTranslation (this.lang.attr, attrVal, 'str', attrName))
},
applyAttr: function (node) {
var self = this;
var tag = node.tagName;
var l;
_each(node.attributes, function (attr) {
l = self.findAttrTranslation (node, attr.name, attr.value);
if (l) attr.value = l;
});
},
/**
* Set translation profile
* @param {Object} lang Language translation hashmap.
*/
setLang: function (lang) {
if (lang instanceof Object)
extend (this.lang, lang);
},
/**
* Get translation
* @return {Object} Language Translation hashmap
*/
getLang: function () {
return extend({}, this.lang);
},
resetLang: function () {
this.lang = {node: {tag: {}, str: {}}, attr: {tag: {}, str: {}}};
}
};
return Translation;
})();