@hugsmidjan/htmldiff-js/src/Utils.js

JavaScript port of HtmlDiff.Net which is itself a C# port of HtmlDiff. Modified for reglugerd.is

const tagRegex = /^\s*<\/?[^>]+>\s*$/;
const tagWordRegex = /<[^\s>]+/;
const whitespaceRegex = /^(\s|&nbsp;)+$/;
const wordRegex = /(?:[\w\d#@þæðöøóòôõáàåäãúùůüûíïýỳÿéèêßçñąćęłńśżź,.])+/i;

const specialCaseWordTags = ['<img', '<video', '<iframe'];

function isTag(item) {
  if (specialCaseWordTags.some((re) => item !== null && item.startsWith(re))) {
    return false;
  }

  return tagRegex.test(item);
}

function stripTagAttributes(word) {
  let tag = tagWordRegex.exec(word)[0];
  word = tag + (word.endsWith('/>') ? '/>' : '>');
  return word;
}

function wrapText(text, tagName, cssClass) {
  return ['<', tagName, ' class="', cssClass, '">', text, '</', tagName, '>'].join('');
}

function isStartOfTag(val) {
  return val === '<';
}

function isEndOfTag(val) {
  return val === '>';
}

function isStartOfEntity(val) {
  return val === '&';
}

function isEndOfEntity(val) {
  return val === ';';
}

function isWhiteSpace(value) {
  return whitespaceRegex.test(value);
}

function stripAnyAttributes(word) {
  if (isTag(word)) {
    return stripTagAttributes(word);
  }

  return word;
}

function isWord(text) {
  return wordRegex.test(text);
}

export {
  isTag,
  stripTagAttributes,
  wrapText,
  isStartOfTag,
  isEndOfTag,
  isStartOfEntity,
  isEndOfEntity,
  isWhiteSpace,
  stripAnyAttributes,
  isWord,
};