React16的异步更新调研 about anu HOT 1 CLOSED

var flattenStack = [];
function flattenCb(child, key, vnode) {
    let childType = typeNumber(child);
    let flatten = flattenStack[0];
    if (childType < 3) {
        //在React16中undefined, null, boolean不会产生节点
        flatten.lastText = null;
        return;
    } else if (childType < 5) {
        //number string
        if (flatten.lastText) {
            //合并相邻的文本节点
            flatten.lastText.text += child;
            return;
        }
        flatten.lastText = child = createVText("#text", child + "");
    } else {
        flatten.lastText = null;
    }
    let postfix = child.key, 
        children = flatten.children;
    if (postfix && !children[".$" + postfix]) {
        children[".$" + postfix] = child;
    } else {
        if (key === ".") {
            key = "." + flatten.index;
        }
        children[key] = child;
    }
    child.index = flatten.index;
    child.return = vnode;
    if (flatten.prev) {
        flatten.prev.sibling = child;
    }
    flatten.prev = child;
    flatten.index++;
    if(!vnode.child){
        vnode.child = child;
    }
}

export function fiberizeChildren(c, updater) {
    if (c !== void 666) {
        let vnode = updater.vnode;
        flattenStack.unshift({
            index: 0,
            children: {}
            /** 
            prev: null,
            lastText: null,
            */
        });
        delete vnode.child;
        operateChildren(c, "", flattenCb, vnode);
        let top = flattenStack.shift();
        if (top.prev) {
            delete top.prev.sibling;
        }
        return updater.children = top.children;        
    }else{
        return updater.children = {};
    }
}