152 lines
3.6 KiB
JavaScript
152 lines
3.6 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict
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*/
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'use strict';
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/*
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const getReactData = require('getReactData');
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const INDENTATION_SIZE = 2;
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const MAX_DEPTH = 2;
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const MAX_STRING_LENGTH = 50;
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*/
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/**
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* Dump all React Native root views and their content. This function tries
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* it best to get the content but ultimately relies on implementation details
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* of React and will fail in future versions.
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*/
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function dumpReactTree(): string {
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try {
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return getReactTree();
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} catch (e) {
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return 'Failed to dump react tree: ' + e;
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}
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}
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function getReactTree() {
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// TODO(sema): Reenable tree dumps using the Fiber tree structure. #15945684
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return (
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'React tree dumps have been temporarily disabled while React is ' +
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'upgraded to Fiber.'
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);
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/*
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let output = '';
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const rootIds = Object.getOwnPropertyNames(ReactNativeMount._instancesByContainerID);
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for (const rootId of rootIds) {
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const instance = ReactNativeMount._instancesByContainerID[rootId];
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output += `============ Root ID: ${rootId} ============\n`;
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output += dumpNode(instance, 0);
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output += `============ End root ID: ${rootId} ============\n`;
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}
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return output;
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*/
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}
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/*
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function dumpNode(node: Object, indentation: number) {
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const data = getReactData(node);
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if (data.nodeType === 'Text') {
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return indent(indentation) + data.text + '\n';
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} else if (data.nodeType === 'Empty') {
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return '';
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}
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let output = indent(indentation) + `<${data.name}`;
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if (data.nodeType === 'Composite') {
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for (const propName of Object.getOwnPropertyNames(data.props || {})) {
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if (isNormalProp(propName)) {
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try {
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const value = convertValue(data.props[propName]);
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if (value) {
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output += ` ${propName}=${value}`;
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}
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} catch (e) {
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const message = `[Failed to get property: ${e}]`;
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output += ` ${propName}=${message}`;
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}
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}
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}
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}
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let childOutput = '';
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for (const child of data.children || []) {
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childOutput += dumpNode(child, indentation + 1);
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}
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if (childOutput) {
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output += '>\n' + childOutput + indent(indentation) + `</${data.name}>\n`;
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} else {
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output += ' />\n';
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}
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return output;
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}
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function isNormalProp(name: string): boolean {
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switch (name) {
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case 'children':
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case 'key':
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case 'ref':
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return false;
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default:
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return true;
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}
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}
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function convertObject(object: Object, depth: number) {
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if (depth >= MAX_DEPTH) {
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return '[...omitted]';
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}
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let output = '{';
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let first = true;
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for (const key of Object.getOwnPropertyNames(object)) {
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if (!first) {
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output += ', ';
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}
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output += `${key}: ${convertValue(object[key], depth + 1)}`;
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first = false;
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}
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return output + '}';
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}
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function convertValue(value, depth = 0): ?string {
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if (!value) {
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return null;
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}
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switch (typeof value) {
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case 'string':
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return JSON.stringify(possiblyEllipsis(value).replace('\n', '\\n'));
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case 'boolean':
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case 'number':
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return JSON.stringify(value);
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case 'function':
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return '[function]';
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case 'object':
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return convertObject(value, depth);
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default:
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return null;
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}
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}
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function possiblyEllipsis(value: string) {
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if (value.length > MAX_STRING_LENGTH) {
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return value.slice(0, MAX_STRING_LENGTH) + '...';
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} else {
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return value;
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}
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}
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function indent(size: number) {
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return ' '.repeat(size * INDENTATION_SIZE);
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}
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*/
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module.exports = dumpReactTree;
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