aaac7fed
 liuqimichale
add
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exports.removeElement = function(elem){
if(elem.prev) elem.prev.next = elem.next;
if(elem.next) elem.next.prev = elem.prev;
if(elem.parent){
var childs = elem.parent.children;
childs.splice(childs.lastIndexOf(elem), 1);
}
};
exports.replaceElement = function(elem, replacement){
var prev = replacement.prev = elem.prev;
if(prev){
prev.next = replacement;
}
var next = replacement.next = elem.next;
if(next){
next.prev = replacement;
}
var parent = replacement.parent = elem.parent;
if(parent){
var childs = parent.children;
childs[childs.lastIndexOf(elem)] = replacement;
}
};
exports.appendChild = function(elem, child){
child.parent = elem;
if(elem.children.push(child) !== 1){
var sibling = elem.children[elem.children.length - 2];
sibling.next = child;
child.prev = sibling;
child.next = null;
}
};
exports.append = function(elem, next){
var parent = elem.parent,
currNext = elem.next;
next.next = currNext;
next.prev = elem;
elem.next = next;
next.parent = parent;
if(currNext){
currNext.prev = next;
if(parent){
var childs = parent.children;
childs.splice(childs.lastIndexOf(currNext), 0, next);
}
} else if(parent){
parent.children.push(next);
}
};
exports.prepend = function(elem, prev){
var parent = elem.parent;
if(parent){
var childs = parent.children;
childs.splice(childs.lastIndexOf(elem), 0, prev);
}
if(elem.prev){
elem.prev.next = prev;
}
prev.parent = parent;
prev.prev = elem.prev;
prev.next = elem;
elem.prev = prev;
};
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