@wordpress/block-editor/build-module/utils/selection.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { RichTextData } from '@wordpress/rich-text';

/**
 * A robust way to retain selection position through various
 * transforms is to insert a special character at the position and
 * then recover it.
 */
export const START_OF_SELECTED_AREA = '\u0086';

/**
 * Retrieve the block attribute that contains the selection position.
 *
 * @param {Object} blockAttributes Block attributes.
 * @return {string|void} The name of the block attribute that was previously selected.
 */
export function retrieveSelectedAttribute(blockAttributes) {
  if (!blockAttributes) {
    return;
  }
  return Object.keys(blockAttributes).find(name => {
    const value = blockAttributes[name];
    return (typeof value === 'string' || value instanceof RichTextData) &&
    // To do: refactor this to use rich text's selection instead, so we
    // no longer have to use on this hack inserting a special character.
    value.toString().indexOf(START_OF_SELECTED_AREA) !== -1;
  });
}
export function findRichTextAttributeKey(blockType) {
  for (const [key, value] of Object.entries(blockType.attributes)) {
    if (value.source === 'rich-text' || value.source === 'html') {
      return key;
    }
  }
}
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