replace urlsterin

trekInfo.js

function replaceURLString(level, row, column, finalFilterUrl) {
      finalFilterUrl = finalFilterUrl.replace("{z}", level).replace("{x}", column).replace("{y}", row);
      finalFilterUrl = finalFilterUrl.replace("${level}", level).replace("${col}", column).replace("${row}", row);
      finalFilterUrl = finalFilterUrl.replace("{l}", level);
      finalFilterUrl = finalFilterUrl.replace("{abc}", "a").replace("{SHASH}", "0").replace("{SHASHPLUSONE}", "1");

      if (finalFilterUrl.indexOf("{nzy}") !== -1) {
        var filterUrl = finalFilterUrl.replace("{z}", level).replace("{x}", column).replace("{y}", row);
        var vData = ((1 << level) - 1 - row);
        finalFilterUrl = filterUrl.replace("{nzy}", vData);
      }
      if (finalFilterUrl.indexOf("{quadtree}") !== -1) {
        var quadtree = "";

        row = ((1 << level) - 1) - row;
        for (var i = level; i >= 1; i--) {
          var digit = 0;

          var mask = 1 << (i - 1);

          if ((column & mask) != 0)
            digit += 1;

          if ((row & mask) != 0)
            digit += 2;

          quadtree += digit;
        }
        finalFilterUrl = finalFilterUrl.replace("{quadtree}", quadtree);
      }
      if (finalFilterUrl.indexOf("{MBBOX}") !== -1) {
        var xMin, xMax, yMin, yMax;
        var boundsmercator;
        initialResolution = 2 * Math.PI * 6378137 / 256; // == 156543.0339
        originShift = 2 * Math.PI * 6378137 / 2.0; // == 20037508.34
        res = initialResolution / Math.pow(2, level);
        row = ((1 << level) - row - 1); // TMS
        xMin = Math.round((column * 256 * res - originShift));
        xMax = Math.round(((column + 1) * 256 * res - originShift));
        yMin = Math.round((row * 256 * res - originShift));
        yMax = Math.round(((row + 1) * 256 * res - originShift));

        if (xMin > xMax) {
          xMax = Math.round((column * 256 * res - originShift));
          xMin = Math.round(((column + 1) * 256 * res - originShift));
        }
        if (yMin > yMax) {
          yMax = Math.round((row * 256 * res - originShift));
          yMin = Math.round(((row + 1) * 256 * res - originShift));
        }
        boundsmercator = xMin + "," + yMin + "," + xMax + "," + yMax;
        finalFilterUrl = finalFilterUrl.replace("{MBBOX}", boundsmercator);
      }
      return finalFilterUrl;
    }