Allow more than one digit range in ol.TileUrlFunction.expandUrl

To be able to have number range like `{9-13}`

src/ol/tileurlfunction.js

@@ -107,16 +107,26 @@ ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, pixelRatio, project
  */
 ol.TileUrlFunction.expandUrl = function(url) {
   var urls = [];
-  var match = /\{(\d)-(\d)\}/.exec(url) || /\{([a-z])-([a-z])\}/.exec(url);
+  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)));
     }
-  } else {
+    return urls;
-    urls.push(url);
   }
+  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;
 };

test/spec/ol/tileurlfunction.test.js

@@ -18,6 +18,15 @@ describe('ol.TileUrlFunction', function() {
           'http://tile-3/{z}/{x}/{y}'
         ]);
       });
+      it('creates expected URLs', function() {
+        var template = 'http://tile-{9-11}/{z}/{x}/{y}';
+        var urls = ol.TileUrlFunction.expandUrl(template);
+        expect(urls).to.eql([
+          'http://tile-9/{z}/{x}/{y}',
+          'http://tile-10/{z}/{x}/{y}',
+          'http://tile-11/{z}/{x}/{y}'
+        ]);
+      });
     });
     describe('with character range', function() {
       it('creates expected URLs', function() {
@@ -30,6 +39,15 @@ describe('ol.TileUrlFunction', function() {
         ]);
       });
     });
+    describe('without range', function() {
+      it('creates expected URLs', function() {
+        var template = 'http://tiles.example.com/{z}/{x}/{y}';
+        var urls = ol.TileUrlFunction.expandUrl(template);
+        expect(urls).to.eql([
+          'http://tiles.example.com/{z}/{x}/{y}'
+        ]);
+      });
+    });
   });
 
   describe('createFromTemplate', function() {