curly.js

curly.js

/* curly.js applies smart quotes (curly) to web pages that does not use it.
 * (C) 2015 Alex Mattrick. CC0 Public Domain Dedication.
 */

var curlyquote = (function() {
  
  // Elements with these tags will be ignored.
  var ignoredTags = ['INPUT', 'PRE', 'CODE', 'SELECT', 'TEXTAREA', 'NOSCRIPT', 'SCRIPT'];
  // Elements with these tags will NOT be considered a separate sentence.
  var continuous = ['STRONG', 'EM', 'B', 'I', 'U', 'A', 'STRIKE', 'SPAN'];
 
  // Create a local copy for undefined in case overwritten.
  var undefined;
 
  var curlyquote = function curlyquote(element, continuity) {
    if (ignoredTags.indexOf(element.tagName) > -1) {
      return true;
    } else if (element.childNodes && element.childNodes.length) {
      // inheritant is the name for the variable continuity for childNodes.
      var child, inheritant = false, i = 0;
      while (child = element.childNodes[i++]) {
        curlyquote(child, inheritant);
        inheritant = (child.tagName === undefined || continuous.indexOf(child.tagName) > -1);
      }
    } else if (element.nodeValue) {
      try { 
        if (continuity) {
          // Adds a random temporary letter to the beginnig so smartypants won't consider
          // it as a separate sentence.
          element.nodeValue = curlyquote.smartypants('s' + element.nodeValue).slice(1);
        } else {
          element.nodeValue = curlyquote.smartypants(element.nodeValue);
        }
      } catch (e) {
        // Nothing happens.
      }
    }
  };
 
  curlyquote.smartypants = function (text) {
    return text
      .replace(/---/g, '\u2014')
      .replace(/--/g, '\u2013')
      .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')       // ‘ LEFT SINGLE
      .replace(/'/g, '\u2019')                              // ’ RIGHT SINGLE
      .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')  // “ LEFT DOUBLE
      .replace(/"/g, '\u201d')                              // ” RIGHT DOUBLE
      .replace(/\.{3}/g, '\u2026');
  };
 
  return curlyquote;
})();

curlyquote(document.body);
document.title = curlyquote.smartypants(document.title);