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uBlock/src/js/udom.js

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/*******************************************************************************
µBlock - a browser extension to block requests.
Copyright (C) 2014 Raymond Hill
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
/* global DOMTokenList */
/* exported uDom */
/******************************************************************************/
// It's just a silly, minimalist DOM framework: this allows me to not rely
// on jQuery. jQuery contains way too much stuff than I need, and as per
// Opera rules, I am not allowed to use a cut-down version of jQuery. So
// the code here does *only* what I need, and nothing more, and with a lot
// of assumption on passed parameters, etc. I grow it on a per-need-basis only.
var uDom = (function() {
'use strict';
/******************************************************************************/
var DOMList = function() {
this.nodes = [];
};
/******************************************************************************/
Object.defineProperty(
DOMList.prototype,
'length',
{
get: function() {
return this.nodes.length;
}
}
);
/******************************************************************************/
var DOMListFactory = function(selector, context) {
var r = new DOMList();
if ( typeof selector === 'string' ) {
selector = selector.trim();
if ( selector !== '' ) {
return addSelectorToList(r, selector, context);
}
}
if ( selector instanceof Node ) {
return addNodeToList(r, selector);
}
if ( selector instanceof NodeList ) {
return addNodeListToList(r, selector);
}
if ( selector instanceof DOMList ) {
return addListToList(r, selector);
}
return r;
};
/******************************************************************************/
DOMListFactory.onLoad = function(callback) {
window.addEventListener('load', callback);
};
/******************************************************************************/
DOMListFactory.nodeFromId = function(id) {
return document.getElementById(id);
};
DOMListFactory.nodeFromSelector = function(selector) {
return document.querySelector(selector);
};
/******************************************************************************/
var addNodeToList = function(list, node) {
if ( node ) {
list.nodes.push(node);
}
return list;
};
/******************************************************************************/
var addNodeListToList = function(list, nodelist) {
if ( nodelist ) {
var n = nodelist.length;
for ( var i = 0; i < n; i++ ) {
list.nodes.push(nodelist[i]);
}
}
return list;
};
/******************************************************************************/
var addListToList = function(list, other) {
list.nodes = list.nodes.concat(other.nodes);
return list;
};
/******************************************************************************/
var addSelectorToList = function(list, selector, context) {
var p = context || document;
var r = p.querySelectorAll(selector);
var n = r.length;
for ( var i = 0; i < n; i++ ) {
list.nodes.push(r[i]);
}
return list;
};
/******************************************************************************/
var nodeInNodeList = function(node, nodeList) {
var i = nodeList.length;
while ( i-- ) {
if ( nodeList[i] === node ) {
return true;
}
}
return false;
};
/******************************************************************************/
var doesMatchSelector = function(node, selector) {
if ( !node ) {
return false;
}
if ( node.nodeType !== 1 ) {
return false;
}
if ( selector === undefined ) {
return true;
}
var parentNode = node.parentNode;
if ( !parentNode || !parentNode.setAttribute ) {
return false;
}
var doesMatch = false;
parentNode.setAttribute('uDom-32kXc6xEZA7o73AMB8vLbLct1RZOkeoO', '');
var grandpaNode = parentNode.parentNode || document;
var nl = grandpaNode.querySelectorAll('[uDom-32kXc6xEZA7o73AMB8vLbLct1RZOkeoO] > ' + selector);
var i = nl.length;
while ( doesMatch === false && i-- ) {
doesMatch = nl[i] === node;
}
parentNode.removeAttribute('uDom-32kXc6xEZA7o73AMB8vLbLct1RZOkeoO');
return doesMatch;
};
/******************************************************************************/
DOMList.prototype.nodeAt = function(i) {
return this.nodes[i];
};
DOMList.prototype.at = function(i) {
return addNodeToList(new DOMList(), this.nodes[i]);
};
/******************************************************************************/
DOMList.prototype.toArray = function() {
return this.nodes.slice();
};
/******************************************************************************/
DOMList.prototype.pop = function() {
return addNodeToList(new DOMList(), this.nodes.pop());
};
/******************************************************************************/
DOMList.prototype.forEach = function(fn) {
var n = this.nodes.length;
for ( var i = 0; i < n; i++ ) {
fn(this.at(i), i);
}
return this;
};
/******************************************************************************/
DOMList.prototype.subset = function(i, l) {
var r = new DOMList();
var n = l !== undefined ? l : this.nodes.length;
var j = Math.min(i + n, this.nodes.length);
if ( i < j ) {
r.nodes = this.nodes.slice(i, j);
}
return r;
};
/******************************************************************************/
DOMList.prototype.first = function() {
return this.subset(0, 1);
};
/******************************************************************************/
DOMList.prototype.next = function(selector) {
var r = new DOMList();
var n = this.nodes.length;
var node;
for ( var i = 0; i < n; i++ ) {
node = this.nodes[i];
while ( node.nextSibling !== null ) {
node = node.nextSibling;
if ( node.nodeType !== 1 ) {
continue;
}
if ( doesMatchSelector(node, selector) === false ) {
continue;
}
addNodeToList(r, node);
break;
}
}
return r;
};
/******************************************************************************/
DOMList.prototype.parent = function() {
var r = new DOMList();
if ( this.nodes.length ) {
addNodeToList(r, this.nodes[0].parentNode);
}
return r;
};
/******************************************************************************/
DOMList.prototype.filter = function(filter) {
var r = new DOMList();
var filterFunc;
if ( typeof filter === 'string' ) {
filterFunc = function() {
return doesMatchSelector(this, filter);
};
} else if ( typeof filter === 'function' ) {
filterFunc = filter;
} else {
filterFunc = function(){
return true;
};
}
var n = this.nodes.length;
var node;
for ( var i = 0; i < n; i++ ) {
node = this.nodes[i];
if ( filterFunc.apply(node) ) {
addNodeToList(r, node);
}
}
return r;
};
/******************************************************************************/
// TODO: Avoid possible duplicates
DOMList.prototype.ancestors = function(selector) {
var r = new DOMList();
var n = this.nodes.length;
var node;
for ( var i = 0; i < n; i++ ) {
node = this.nodes[i].parentNode;
while ( node ) {
if ( doesMatchSelector(node, selector) ) {
addNodeToList(r, node);
}
node = node.parentNode;
}
}
return r;
};
/******************************************************************************/
DOMList.prototype.descendants = function(selector) {
var r = new DOMList();
var n = this.nodes.length;
var nl;
for ( var i = 0; i < n; i++ ) {
nl = this.nodes[i].querySelectorAll(selector);
addNodeListToList(r, nl);
}
return r;
};
/******************************************************************************/
DOMList.prototype.contents = function() {
var r = new DOMList();
var cnodes, cn, ci;
var n = this.nodes.length;
for ( var i = 0; i < n; i++ ) {
cnodes = this.nodes[i].childNodes;
cn = cnodes.length;
for ( ci = 0; ci < cn; ci++ ) {
addNodeToList(r, cnodes.item(ci));
}
}
return r;
};
/******************************************************************************/
DOMList.prototype.remove = function() {
var cn, p;
var i = this.nodes.length;
while ( i-- ) {
cn = this.nodes[i];
if ( (p = cn.parentNode) ) {
p.removeChild(cn);
}
}
return this;
};
DOMList.prototype.detach = DOMList.prototype.remove;
/******************************************************************************/
DOMList.prototype.empty = function() {
var node;
var i = this.nodes.length;
while ( i-- ) {
node = this.nodes[i];
while ( node.firstChild ) {
node.removeChild(node.firstChild);
}
}
return this;
};
/******************************************************************************/
DOMList.prototype.append = function(selector, context) {
var p = this.nodes[0];
if ( p ) {
var c = DOMListFactory(selector, context);
var n = c.nodes.length;
for ( var i = 0; i < n; i++ ) {
p.appendChild(c.nodes[i]);
}
}
return this;
};
/******************************************************************************/
DOMList.prototype.prepend = function(selector, context) {
var p = this.nodes[0];
if ( p ) {
var c = DOMListFactory(selector, context);
var i = c.nodes.length;
while ( i-- ) {
p.insertBefore(c.nodes[i], p.firstChild);
}
}
return this;
};
/******************************************************************************/
DOMList.prototype.appendTo = function(selector, context) {
var p = selector instanceof DOMListFactory ? selector : DOMListFactory(selector, context);
var n = p.length;
for ( var i = 0; i < n; i++ ) {
p.nodes[0].appendChild(this.nodes[i]);
}
return this;
};
/******************************************************************************/
DOMList.prototype.insertAfter = function(selector, context) {
if ( this.nodes.length === 0 ) {
return this;
}
var p = this.nodes[0].parentNode;
if ( !p ) {
return this;
}
var c = DOMListFactory(selector, context);
var n = c.nodes.length;
for ( var i = 0; i < n; i++ ) {
p.appendChild(c.nodes[i]);
}
return this;
};
/******************************************************************************/
DOMList.prototype.insertBefore = function(selector, context) {
if ( this.nodes.length === 0 ) {
return this;
}
var referenceNodes = DOMListFactory(selector, context);
if ( referenceNodes.nodes.length === 0 ) {
return this;
}
var referenceNode = referenceNodes.nodes[0];
var parentNode = referenceNode.parentNode;
if ( !parentNode ) {
return this;
}
var n = this.nodes.length;
for ( var i = 0; i < n; i++ ) {
parentNode.insertBefore(this.nodes[i], referenceNode);
}
return this;
};
/******************************************************************************/
DOMList.prototype.clone = function(notDeep) {
var r = new DOMList();
var n = this.nodes.length;
for ( var i = 0; i < n; i++ ) {
addNodeToList(r, this.nodes[i].cloneNode(!notDeep));
}
return r;
};
/******************************************************************************/
DOMList.prototype.nthOfType = function() {
if ( this.nodes.length === 0 ) {
return 0;
}
var node = this.nodes[0];
var tagName = node.tagName;
var i = 1;
while ( node.previousElementSibling !== null ) {
node = node.previousElementSibling;
if ( typeof node.tagName !== 'string' ) {
continue;
}
if ( node.tagName !== tagName ) {
continue;
}
i++;
}
return i;
};
/******************************************************************************/
DOMList.prototype.attr = function(attr, value) {
var i = this.nodes.length;
if ( value === undefined && typeof attr !== 'object' ) {
return i ? this.nodes[0].getAttribute(attr) : undefined;
}
if ( typeof attr === 'object' ) {
var attrNames = Object.keys(attr);
var node, j, attrName;
while ( i-- ) {
node = this.nodes[i];
j = attrNames.length;
while ( j-- ) {
attrName = attrNames[j];
node.setAttribute(attrName, attr[attrName]);
}
}
} else {
while ( i-- ) {
this.nodes[i].setAttribute(attr, value);
}
}
return this;
};
/******************************************************************************/
DOMList.prototype.prop = function(prop, value) {
var i = this.nodes.length;
if ( value === undefined ) {
return i !== 0 ? this.nodes[0][prop] : undefined;
}
while ( i-- ) {
this.nodes[i][prop] = value;
}
return this;
};
/******************************************************************************/
DOMList.prototype.css = function(prop, value) {
var i = this.nodes.length;
if ( value === undefined ) {
return i ? this.nodes[0].style[prop] : undefined;
}
if ( value !== '' ) {
while ( i-- ) {
this.nodes[i].style.setProperty(prop, value);
}
return this;
}
while ( i-- ) {
this.nodes[i].style.removeProperty(prop);
}
return this;
};
/******************************************************************************/
DOMList.prototype.val = function(value) {
return this.prop('value', value);
};
/******************************************************************************/
DOMList.prototype.html = function(html) {
var i = this.nodes.length;
if ( html === undefined ) {
return i ? this.nodes[0].innerHTML : '';
}
while ( i-- ) {
vAPI.insertHTML(this.nodes[i], html);
}
return this;
};
/******************************************************************************/
DOMList.prototype.text = function(text) {
var i = this.nodes.length;
if ( text === undefined ) {
return i ? this.nodes[0].textContent : '';
}
while ( i-- ) {
this.nodes[i].textContent = text;
}
return this;
};
/******************************************************************************/
var toggleClass = function(node, className, targetState) {
var tokenList = node.classList;
if ( tokenList instanceof DOMTokenList === false ) {
return;
}
var currentState = tokenList.contains(className);
var newState = targetState;
if ( newState === undefined ) {
newState = !currentState;
}
if ( newState === currentState ) {
return;
}
tokenList.toggle(className, newState);
};
/******************************************************************************/
DOMList.prototype.hasClass = function(className) {
if ( !this.nodes.length ) {
return false;
}
var tokenList = this.nodes[0].classList;
return tokenList instanceof DOMTokenList &&
tokenList.contains(className);
};
DOMList.prototype.hasClassName = DOMList.prototype.hasClass;
DOMList.prototype.addClass = function(className) {
return this.toggleClass(className, true);
};
DOMList.prototype.removeClass = function(className) {
if ( className !== undefined ) {
return this.toggleClass(className, false);
}
var i = this.nodes.length;
while ( i-- ) {
this.nodes[i].className = '';
}
return this;
};
/******************************************************************************/
DOMList.prototype.toggleClass = function(className, targetState) {
if ( className.indexOf(' ') !== -1 ) {
return this.toggleClasses(className, targetState);
}
var i = this.nodes.length;
while ( i-- ) {
toggleClass(this.nodes[i], className, targetState);
}
return this;
};
/******************************************************************************/
DOMList.prototype.toggleClasses = function(classNames, targetState) {
var tokens = classNames.split(/\s+/);
var i = this.nodes.length;
var node, j;
while ( i-- ) {
node = this.nodes[i];
j = tokens.length;
while ( j-- ) {
toggleClass(node, tokens[j], targetState);
}
}
return this;
};
/******************************************************************************/
var listenerEntries = [];
var ListenerEntry = function(target, type, capture, callback) {
this.target = target;
this.type = type;
this.capture = capture;
this.callback = callback;
target.addEventListener(type, callback, capture);
};
ListenerEntry.prototype.dispose = function() {
this.target.removeEventListener(this.type, this.callback, this.capture);
this.target = null;
this.callback = null;
};
/******************************************************************************/
var makeEventHandler = function(selector, callback) {
return function(event) {
var dispatcher = event.currentTarget;
if ( !dispatcher || typeof dispatcher.querySelectorAll !== 'function' ) {
return;
}
var receiver = event.target;
if ( nodeInNodeList(receiver, dispatcher.querySelectorAll(selector)) ) {
callback.call(receiver, event);
}
};
};
DOMList.prototype.on = function(etype, selector, callback) {
if ( typeof selector === 'function' ) {
callback = selector;
selector = undefined;
} else {
callback = makeEventHandler(selector, callback);
}
var i = this.nodes.length;
while ( i-- ) {
listenerEntries.push(new ListenerEntry(this.nodes[i], etype, selector !== undefined, callback));
}
return this;
};
/******************************************************************************/
// TODO: Won't work for delegated handlers. Need to figure
// what needs to be done.
DOMList.prototype.off = function(evtype, callback) {
var i = this.nodes.length;
while ( i-- ) {
this.nodes[i].removeEventListener(evtype, callback);
}
return this;
};
/******************************************************************************/
DOMList.prototype.trigger = function(etype) {
var ev = new CustomEvent(etype);
var i = this.nodes.length;
while ( i-- ) {
this.nodes[i].dispatchEvent(ev);
}
return this;
};
/******************************************************************************/
// Cleanup
var onBeforeUnload = function() {
var entry;
while ( (entry = listenerEntries.pop()) ) {
entry.dispose();
}
window.removeEventListener('beforeunload', onBeforeUnload);
};
window.addEventListener('beforeunload', onBeforeUnload);
/******************************************************************************/
return DOMListFactory;
})();
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