@wordpress/blocks/build-module/api/raw-handling/html-formatting-remover.js

Block API for WordPress.

/**
 * Internal dependencies
 */
import { getSibling } from './utils';
function isFormattingSpace(character) {
  return character === ' ' || character === '\r' || character === '\n' || character === '\t';
}

/**
 * Removes spacing that formats HTML.
 *
 * @see https://www.w3.org/TR/css-text-3/#white-space-processing
 *
 * @param {Node} node The node to be processed.
 * @return {void}
 */
export default function htmlFormattingRemover(node) {
  if (node.nodeType !== node.TEXT_NODE) {
    return;
  }

  // Ignore pre content. Note that this does not use Element#closest due to
  // a combination of (a) node may not be Element and (b) node.parentElement
  // does not have full support in all browsers (Internet Exporer).
  //
  // See: https://developer.mozilla.org/en-US/docs/Web/API/Node/parentElement#Browser_compatibility

  /** @type {Node?} */
  let parent = node;
  while (parent = parent.parentNode) {
    if (parent.nodeType === parent.ELEMENT_NODE && parent.nodeName === 'PRE') {
      return;
    }
  }

  // First, replace any sequence of HTML formatting space with a single space.
  let newData = node.data.replace(/[ \r\n\t]+/g, ' ');

  // Remove the leading space if the text element is at the start of a block,
  // is preceded by a line break element, or has a space in the previous
  // node.
  if (newData[0] === ' ') {
    const previousSibling = getSibling(node, 'previous');
    if (!previousSibling || previousSibling.nodeName === 'BR' || previousSibling.textContent.slice(-1) === ' ') {
      newData = newData.slice(1);
    }
  }

  // Remove the trailing space if the text element is at the end of a block,
  // is succeeded by a line break element, or has a space in the next text
  // node.
  if (newData[newData.length - 1] === ' ') {
    const nextSibling = getSibling(node, 'next');
    if (!nextSibling || nextSibling.nodeName === 'BR' || nextSibling.nodeType === nextSibling.TEXT_NODE && isFormattingSpace(nextSibling.textContent[0])) {
      newData = newData.slice(0, -1);
    }
  }

  // If there's no data left, remove the node, so `previousSibling` stays
  // accurate. Otherwise, update the node data.
  if (!newData) {
    node.parentNode.removeChild(node);
  } else {
    node.data = newData;
  }
}
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