curlify.js

'use strict';

(function IIFE(global){

  function makeCurly(text) {

    // TODO: don't change within <code> or <pre> tags
    // TODO: shouldn't replace hard-coded curly quotes
    // TODO: "<b>this</b>" doesn't work because it's a different text node
    // TODO: still can't handle words abbreviated at the start e.g. ’nix.
   
    // replace " and ' for feet and inches with primes
    // text = text.replace(/(\W\d)\u0027(\W)/g,'$1\u2032$2');
    // text = text.replace(/(\W\d)\u201D(\W)/g,'$1\u2033$2');

    // replace beginning " quotes
    text = text.replace(/(^|\s|>)\u0022(\S)/g,'$1\u201c$2');

    // replace ending " quotes
    text = text.replace(/(\S)\u0022(\W|$)/g,'$1\u201D$2');
    // text = text.replace(/(\S)\u0022(\s|\.|:|;|'|\u0022|<|$)/g,'$1”$2');

    // replace ' in (incorrect) year abbreviations
    text = text.replace(/(\d\d)\u0027([sS])/g,'$1\u2019$2');

    // replace 'n', with or without spaces surrounding it
    text = text.replace(/(\w ?)\u0027n\u0027( ?\w)/g,'$1\u2019n\u2019$2');

    // replace ' in contracted words like that's
    text = text.replace(/(\w+)\u0027(\w+)/g,'$1\u2019$2');
    // replace double contractions (same again)
    text = text.replace(/(\w+)\u0027(\w+)/g,'$1\u2019$2');

    // replace 'words' in single quotes
    text = text.replace(/(\W|^)\u0027(\w+)(\.)?\u0027(\W|$)/g,'$1\u2018$2$3\u2019$4');

    // replace beginning ' quotes
    text = text.replace(/(\s|^|\u201c|\u0027|>)\u0027(\S)/g,'$1\u2018$2');

    // replace ending ' quotes
    text = text.replace(/(\S)\u0027(\W|$)/g,'$1\u2019$2');

    // replace '64 but not '64 million' or '1600'
    text = text.replace(/[\u2018|\u0027](\d\d)([sS]?)([\W|$])(?!hundred|thousand|million|billion|trillion)/g,'\u2019$1$2$3');

    // replace ' at the start of abbreviated words like 'cause
    text = text.replace(/[\u0027|\u2018](tis|twas|cause|coz|em|im|er|ave|ole?)(\W)/gi, '\u2019$1$2');

    // let's not forget Hawai‘i
    text = text.replace(/Hawai[\u0027\u2019]i/g,'Hawai\u2018i');
    
    // show existing dumb quotes
    // text = text.replace(/([\u0027|\u0022])/g,'!_!!!$1!!!_!');

    // replace hyphens with em dashes
    text = text.replace(/ -+ /g,' \u2014 ');

    // replace hyphens with en dashes for ranges and years
    text = text.replace(/(\d+)-(\d+)/g,'$1\u2013$2');

    return text;

  }

  function curlifyAll(node) {

      // if current node is a text node, make it curly
      if (node.nodeType == 3) {
          node.data = makeCurly(node.data);
          return;
      }

      // otherwise cycle through its children recursively check those
      for (var m = node.firstChild; m != null; m = m.nextSibling) {
        curlifyAll(m);
      }
  }

  // make text curly after everything else is loaded
  // (since it's not so important)
  global.onload = function(){

    curlifyAll(global.document.body);

  }


})(window);