Function _processSpaces

src/node/utils/ExportHtml.ts:545–597

(s: string)

// copied from ACE
const _processSpaces = (s: string) => {
  const doesWrap = true;
  if (s.indexOf('<') < 0 && !doesWrap) {
    // short-cut
    return s.replace(/[ \u00a0]/g, '&nbsp;');
  }
  const parts: string[] = [];
  s.replace(/<[^>]*>?|[ \u00a0]|[^ \u00a0<]+/g, (m) => {
    parts.push(m);
    return m
  });
  // U+00A0 is content for run-bookkeeping - it terminates a space run
  // just like a word character would, so runs of regular spaces adjacent
  // to a nbsp are not miscounted as one long run (issue #3037).
  if (doesWrap) {
    let endOfLine = true;
    let beforeSpace = false;
    // last space in a run is normal, others are nbsp,
    // end of line is nbsp
    for (let i = parts.length - 1; i >= 0; i--) {
      const p = parts[i];
      if (p === ' ') {
        if (endOfLine || beforeSpace) parts[i] = '&nbsp;';
        endOfLine = false;
        beforeSpace = true;
      } else if (p.charAt(0) !== '<') {
        endOfLine = false;
        beforeSpace = false;
      }
    }
    // beginning of line is nbsp
    for (let i = 0; i < parts.length; i++) {
      const p = parts[i];
      if (p === ' ') {
        parts[i] = '&nbsp;';
        break;
      } else if (p.charAt(0) !== '<') {
        break;
      }
    }
  } else {
    for (let i = 0; i < parts.length; i++) {
      const p = parts[i];
      if (p === ' ') {
        parts[i] = '&nbsp;';
      }
    }
  }
  for (let i = 0; i < parts.length; i++) {
    if (parts[i] === '\u00a0') parts[i] = '&nbsp;';
  }
  return parts.join('');
};

exports.getPadHTML = getPadHTML;
exports.getHTMLFromAtext = getHTMLFromAtext;