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ReactFiberStack.new.js
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ReactFiberStack.new.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type {Fiber} from './ReactInternalTypes';
export type StackCursor<T> = {|current: T|};
const valueStack: Array<any> = [];
let fiberStack: Array<Fiber | null>;
if (__DEV__) {
fiberStack = [];
}
let index = -1;
function createCursor<T>(defaultValue: T): StackCursor<T> {
return {
current: defaultValue,
};
}
function isEmpty(): boolean {
return index === -1;
}
function pop<T>(cursor: StackCursor<T>, fiber: Fiber): void {
if (index < 0) {
if (__DEV__) {
console.error('Unexpected pop.');
}
return;
}
if (__DEV__) {
if (fiber !== fiberStack[index]) {
console.error('Unexpected Fiber popped.');
}
}
cursor.current = valueStack[index];
valueStack[index] = null;
if (__DEV__) {
fiberStack[index] = null;
}
index--;
}
function push<T>(cursor: StackCursor<T>, value: T, fiber: Fiber): void {
index++;
valueStack[index] = cursor.current;
if (__DEV__) {
fiberStack[index] = fiber;
}
cursor.current = value;
}
function checkThatStackIsEmpty() {
if (__DEV__) {
if (index !== -1) {
console.error(
'Expected an empty stack. Something was not reset properly.',
);
}
}
}
function resetStackAfterFatalErrorInDev() {
if (__DEV__) {
index = -1;
valueStack.length = 0;
fiberStack.length = 0;
}
}
export {
createCursor,
isEmpty,
pop,
push,
// DEV only:
checkThatStackIsEmpty,
resetStackAfterFatalErrorInDev,
};