typeset/src/quotes.js

Typesetting for the web

module.exports = (text, node, $) => {
  if ($(node).parent().is("p, blockquote") && $(node).parent().text() !== text) {
    const parentText = replace($(node).parent().text());
    let start = 0;

    $(node).parent().contents().each(function () {
      if (this === node) return false;

      start += $(this).text().length;
    });

    return parentText.slice(start, start + text.length);
  }

  return replace(text);
};

function replace(text) {
  text = text
    .replace(/(\W|^)"([^\s\!\?:;\.,‽»])/g, "$1\u201c$2") // beginning "
    .replace(/(\u201c[^"]*)"([^"]*$|[^\u201c"]*\u201c)/g, "$1\u201d$2") // ending "
    .replace(/([^0-9])"/g, "$1\u201d") // remaining " at end of word
    .replace(/(\W|^)'(\S)/g, "$1\u2018$2") // beginning '
    .replace(/([a-z])'([a-z])/gi, "$1\u2019$2") // conjunction's possession
    .replace(/((\u2018[^']*)|[a-z])'([^0-9]|$)/gi, "$1\u2019$3") // ending '
    .replace(
      /(\u2018)([0-9]{2}[^\u2019]*)(\u2018([^0-9]|$)|$|\u2019[a-z])/gi,
      "\u2019$2$3"
    ) // abbrev. years like '93
    .replace(
      /(\B|^)\u2018(?=([^\u2019]*\u2019\b)*([^\u2019\u2018]*\W[\u2019\u2018]\b|[^\u2019\u2018]*$))/gi,
      "$1\u2019"
    ) // backwards apostrophe
    .replace(/'''/g, "\u2034") // triple prime
    .replace(/("|'')/g, "\u2033") // double prime
    .replace(/'/g, "\u2032");

  // Allow escaped quotes
  text = text
    .replace(/\\“/g, '"')
    .replace(/\\”/g, '"')
    .replace(/\\’/g, "'")
    .replace(/\\‘/g, "'");

  return text;
}