showdown/src/subParsers/detab.js

/**
 * Convert all tabs to spaces
 */
showdown.subParser('detab', function (text) {
  'use strict';

  // expand first n-1 tabs
  text = text.replace(/\t(?=\t)/g, '    '); // g_tab_width

  // replace the nth with two sentinels
  text = text.replace(/\t/g, '~A~B');

  // use the sentinel to anchor our regex so it doesn't explode
  text = text.replace(/~B(.+?)~A/g, function (wholeMatch, m1) {
    var leadingText = m1,
        numSpaces = 4 - leadingText.length % 4;  // g_tab_width

    // there *must* be a better way to do this:
    for (var i = 0; i < numSpaces; i++) {
      leadingText += ' ';
    }

    return leadingText;
  });

  // clean up sentinels
  text = text.replace(/~A/g, '    ');  // g_tab_width
  text = text.replace(/~B/g, '');

  return text;

});