@wordpress/block-editor/build-module/utils/get-paste-event-data.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { createBlobURL } from '@wordpress/blob';
import { getFilesFromDataTransfer } from '@wordpress/dom';
export function getPasteEventData({
  clipboardData
}) {
  let plainText = '';
  let html = ''; // IE11 only supports `Text` as an argument for `getData` and will
  // otherwise throw an invalid argument error, so we try the standard
  // arguments first, then fallback to `Text` if they fail.

  try {
    plainText = clipboardData.getData('text/plain');
    html = clipboardData.getData('text/html');
  } catch (error1) {
    try {
      html = clipboardData.getData('Text');
    } catch (error2) {
      // Some browsers like UC Browser paste plain text by default and
      // don't support clipboardData at all, so allow default
      // behaviour.
      return;
    }
  }

  const files = getFilesFromDataTransfer(clipboardData).filter(({
    type
  }) => /^image\/(?:jpe?g|png|gif)$/.test(type)); // Only process files if no HTML is present.
  // A pasted file may have the URL as plain text.

  if (files.length && !html) {
    html = files.map(file => `<img src="${createBlobURL(file)}">`).join('');
    plainText = '';
  }

  return {
    html,
    plainText
  };
}
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