# all files / ol/ tileurlfunction.js

100% Statements 55/55
100% Branches 10/10
100% Functions 9/9
100% Lines 55/55

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     goog.provide('ol.TileUrlFunction');

    goog.require('ol.asserts');
    goog.require('ol.math');
    goog.require('ol.tilecoord');

    /**
     * @param {string} template Template.
     * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
     * @return {ol.TileUrlFunctionType} Tile URL function.
     */
    ol.TileUrlFunction.createFromTemplate = function(template, tileGrid) {
      var zRegEx = /\{z\}/g;
      var xRegEx = /\{x\}/g;
      var yRegEx = /\{y\}/g;
      var dashYRegEx = /\{-y\}/g;
      return (
        /**
         * @param {ol.TileCoord} tileCoord Tile Coordinate.
         * @param {number} pixelRatio Pixel ratio.
         * @param {ol.proj.Projection} projection Projection.
         * @return {string|undefined} Tile URL.
         */
        function(tileCoord, pixelRatio, projection) {
          if (!tileCoord) {
            return undefined;
          } else {
            return template.replace(zRegEx, tileCoord[0].toString())
                .replace(xRegEx, tileCoord[1].toString())
                .replace(yRegEx, function() {
                  var y = -tileCoord[2] - 1;
                  return y.toString();
                })
                .replace(dashYRegEx, function() {
                  var z = tileCoord[0];
                  var range = tileGrid.getFullTileRange(z);
                  ol.asserts.assert(range, 55); // The {-y} placeholder requires a tile grid with extent
                  var y = range.getHeight() + tileCoord[2];
                  return y.toString();
                });
          }
        });
    };

    /**
     * @param {Array.<string>} templates Templates.
     * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
     * @return {ol.TileUrlFunctionType} Tile URL function.
     */
    ol.TileUrlFunction.createFromTemplates = function(templates, tileGrid) {
      var len = templates.length;
      var tileUrlFunctions = new Array(len);
      for (var i = 0; i < len; ++i) {
        tileUrlFunctions[i] = ol.TileUrlFunction.createFromTemplate(
            templates[i], tileGrid);
      }
      return ol.TileUrlFunction.createFromTileUrlFunctions(tileUrlFunctions);
    };

    /**
     * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
     * @return {ol.TileUrlFunctionType} Tile URL function.
     */
    ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
      if (tileUrlFunctions.length === 1) {
        return tileUrlFunctions[0];
      }
      return (
        /**
         * @param {ol.TileCoord} tileCoord Tile Coordinate.
         * @param {number} pixelRatio Pixel ratio.
         * @param {ol.proj.Projection} projection Projection.
         * @return {string|undefined} Tile URL.
         */
        function(tileCoord, pixelRatio, projection) {
          if (!tileCoord) {
            return undefined;
          } else {
            var h = ol.tilecoord.hash(tileCoord);
            var index = ol.math.modulo(h, tileUrlFunctions.length);
            return tileUrlFunctions[index](tileCoord, pixelRatio, projection);
          }
        });
    };

    /**
     * @param {ol.TileCoord} tileCoord Tile coordinate.
     * @param {number} pixelRatio Pixel ratio.
     * @param {ol.proj.Projection} projection Projection.
     * @return {string|undefined} Tile URL.
     */
    ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, pixelRatio, projection) {
      return undefined;
    };

    /**
     * @param {string} url URL.
     * @return {Array.<string>} Array of urls.
     */
    ol.TileUrlFunction.expandUrl = function(url) {
      var urls = [];
      var match = /\{([a-z])-([a-z])\}/.exec(url);
      if (match) {
        // char range
        var startCharCode = match[1].charCodeAt(0);
        var stopCharCode = match[2].charCodeAt(0);
        var charCode;
        for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {
          urls.push(url.replace(match[0], String.fromCharCode(charCode)));
        }
        return urls;
      }
      match = match = /\{(\d+)-(\d+)\}/.exec(url);
      if (match) {
        // number range
        var stop = parseInt(match[2], 10);
        for (var i = parseInt(match[1], 10); i <= stop; i++) {
          urls.push(url.replace(match[0], i.toString()));
        }
        return urls;
      }
      urls.push(url);
      return urls;
    };