/**
 * Internal dependencies
 */

import { OBJECT_REPLACEMENT_CHARACTER } from './special-characters';

/** @typedef {import('./types').RichTextValue} RichTextValue */
/** @typedef {import('./types').RichTextFormat} RichTextFormat */

/**
 * Gets the active object, if there is any.
 *
 * @param {RichTextValue} value Value to inspect.
 *
 * @return {RichTextFormat|void} Active object, or undefined.
 */
export function getActiveObject({
  start,
  end,
  replacements,
  text
}) {
  if (start + 1 !== end || text[start] !== OBJECT_REPLACEMENT_CHARACTER) {
    return;
  }
  return replacements[start];
}
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