Move factorizable code in ol.TileUrlFunction.expandUrl

src/ol/source/wmtssource.js

@@ -66,23 +66,10 @@ ol.source.WMTS = function(wmtsOptions) {
     goog.object.extend(kvpParams, context);
   }
 
-  // TODO: factorize the code below so that it is usable by all sources
   var urls = wmtsOptions.urls;
   if (!goog.isDef(urls)) {
-    urls = [];
-    var url = wmtsOptions.url;
-    goog.asserts.assert(goog.isDef(url));
-    var match = /\{(\d)-(\d)\}/.exec(url) || /\{([a-z])-([a-z])\}/.exec(url);
-    if (match) {
-      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 {
-      urls.push(url);
-    }
+    goog.asserts.assert(goog.isDef(wmtsOptions.url));
+    urls = ol.TileUrlFunction.expandUrl(wmtsOptions.url);
   }
 
   /**

src/ol/tileurlfunction.js

@@ -120,3 +120,24 @@ ol.TileUrlFunction.withTileCoordTransform =
     }
   };
 };
+
+
+/**
+ * @param {string} url Url.
+ * @return {Array.<string>} Array of urls.
+ */
+ol.TileUrlFunction.expandUrl = function(url) {
+  var urls = [];
+  var match = /\{(\d)-(\d)\}/.exec(url) || /\{([a-z])-([a-z])\}/.exec(url);
+  if (match) {
+    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 {
+    urls.push(url);
+  }
+  return urls;
+};

test/spec/ol/tileurlfunction.test.js

@@ -2,6 +2,31 @@ goog.provide('ol.test.TileUrlFunction');
 
 describe('ol.TileUrlFunction', function() {
 
+  describe('expandUrl', function() {
+    describe('with number range', function() {
+      it('creates expected URLs', function() {
+        var template = 'http://tile-{1-3}/{z}/{x}/{y}';
+        var urls = ol.TileUrlFunction.expandUrl(template);
+        expect(urls).toEqual([
+          'http://tile-1/{z}/{x}/{y}',
+          'http://tile-2/{z}/{x}/{y}',
+          'http://tile-3/{z}/{x}/{y}'
+        ]);
+      });
+    });
+    describe('with character range', function() {
+      it('creates expected URLs', function() {
+        var template = 'http://tile-{c-e}/{z}/{x}/{y}';
+        var urls = ol.TileUrlFunction.expandUrl(template);
+        expect(urls).toEqual([
+          'http://tile-c/{z}/{x}/{y}',
+          'http://tile-d/{z}/{x}/{y}',
+          'http://tile-e/{z}/{x}/{y}'
+        ]);
+      });
+    });
+  });
+
   describe('createFromTemplate', function() {
     it('creates expected URL', function() {
       var tileUrl = ol.TileUrlFunction.createFromTemplate('{z}/{x}/{y}');