"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isFormatEqual = isFormatEqual;
/** @typedef {import('./types').RichTextFormat} RichTextFormat */

/**
 * Optimised equality check for format objects.
 *
 * @param {?RichTextFormat} format1 Format to compare.
 * @param {?RichTextFormat} format2 Format to compare.
 *
 * @return {boolean} True if formats are equal, false if not.
 */
function isFormatEqual(format1, format2) {
  // Both not defined.
  if (format1 === format2) {
    return true;
  }

  // Either not defined.
  if (!format1 || !format2) {
    return false;
  }
  if (format1.type !== format2.type) {
    return false;
  }
  const attributes1 = format1.attributes;
  const attributes2 = format2.attributes;

  // Both not defined.
  if (attributes1 === attributes2) {
    return true;
  }

  // Either not defined.
  if (!attributes1 || !attributes2) {
    return false;
  }
  const keys1 = Object.keys(attributes1);
  const keys2 = Object.keys(attributes2);
  if (keys1.length !== keys2.length) {
    return false;
  }
  const length = keys1.length;

  // Optimise for speed.
  for (let i = 0; i < length; i++) {
    const name = keys1[i];
    if (attributes1[name] !== attributes2[name]) {
      return false;
    }
  }
  return true;
}
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