prepack/lib/utils/json.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.mergeAdjacentJSONTextNodes = mergeAdjacentJSONTextNodes;

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
// this will mutate the original JSON object
function mergeAdjacentJSONTextNodes(node, removeFunctions, visitedNodes) {
  if (visitedNodes === undefined) {
    visitedNodes = new Set();
  }

  if (visitedNodes.has(node)) {
    return node;
  }

  visitedNodes.add(node); // we merge adjacent text nodes

  if (Array.isArray(node)) {
    // we create a new array rather than mutating the original
    let arr = [];
    let length = node.length;
    let concatString = null;
    let i = -1;

    while (i++ < length) {
      let child = node[i];

      if (typeof child === "string" || typeof child === "number") {
        if (concatString !== null) {
          concatString += child;
        } else {
          concatString = child;
        }
      } else if (typeof child === "object" && child !== null) {
        if (concatString !== null && concatString !== "") {
          arr.push(concatString);
          concatString = null;
        }

        arr.push(mergeAdjacentJSONTextNodes(child, removeFunctions, visitedNodes));
      }
    }

    if (concatString !== null && concatString !== "") {
      arr.push(concatString);
    }

    return arr;
  } else {
    for (let key in node) {
      let value = node[key];

      if (typeof value === "function") {
        if (removeFunctions) {
          delete node[key];
        } else {
          node[key] = "function";
        }
      } else if (typeof value === "object" && value !== null) {
        node[key] = mergeAdjacentJSONTextNodes(value, removeFunctions, visitedNodes);
      }
    }
  }

  return node;
}
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