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// Effect tags | |
const PLACEMENT = 1; | |
const DELETION = 2; | |
const UPDATE = 3; | |
function arrify(val) { | |
return val == null ? [] : Array.isArray(val) ? val : [val]; | |
} | |
function reconcileChildrenArray(wipFiber, newChildElements) { | |
const elements = arrify(newChildElements); | |
let index = 0; | |
let oldFiber = wipFiber.alternate ? wipFiber.alternate.child : null; | |
let newFiber = null; | |
while (index < elements.length || oldFiber != null) { | |
const prevFiber = newFiber; | |
const element = index < elements.length && elements[index]; | |
const sameType = oldFiber && element && element.type == oldFiber.type; | |
if (sameType) { | |
newFiber = { | |
type: oldFiber.type, | |
tag: oldFiber.tag, | |
stateNode: oldFiber.stateNode, | |
props: element.props, | |
parent: wipFiber, | |
alternate: oldFiber, | |
partialState: oldFiber.partialState, | |
effectTag: UPDATE | |
}; | |
} | |
if (element && !sameType) { | |
newFiber = { | |
type: element.type, | |
tag: | |
typeof element.type === "string" ? HOST_COMPONENT : CLASS_COMPONENT, | |
props: element.props, | |
parent: wipFiber, | |
effectTag: PLACEMENT | |
}; | |
} | |
if (oldFiber && !sameType) { | |
oldFiber.effectTag = DELETION; | |
wipFiber.effects = wipFiber.effects || []; | |
wipFiber.effects.push(oldFiber); | |
} | |
if (oldFiber) { | |
oldFiber = oldFiber.sibling; | |
} | |
if (index == 0) { | |
wipFiber.child = newFiber; | |
} else if (prevFiber && element) { | |
prevFiber.sibling = newFiber; | |
} | |
index++; | |
} | |
} |
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