new toplist util file

lib/util/toplist.js

@@ -0,0 +1,70 @@
+module.exports = {
+  getAssetsBySize: function(assets, limit) {
+    assets.sort(function(asset, asset2) {
+      return asset2.size - asset.size;
+    });
+
+    if (assets.length > limit) {
+      assets.length = limit;
+    }
+    return assets;
+  },
+
+  getLargestImages: function(assets, limit) {
+    var largestImages = assets.filter(function(asset) {
+      return (asset.type === 'image' || asset.type === 'cssimage');
+    });
+
+    largestImages.sort(function(asset, asset2) {
+      return asset2.size - asset.size;
+    });
+
+    if (largestImages.length > limit) {
+      largestImages.length = limit;
+    }
+    return largestImages;
+  },
+  getLargestDiffBetweenLastModAndCache: function(assets, limit) {
+    // sometimes the last mod is -1 if it is not set by the server
+    var biggestDiff = assets.filter(function(asset) {
+      return asset.timeSinceLastModification !== -1;
+    });
+
+    biggestDiff.sort(function(asset, asset2) {
+      var diff = asset.cacheTime - asset.timeSinceLastModification;
+      var diff2 = asset2.cacheTime - asset2.timeSinceLastModification;
+
+      return diff - diff2;
+    });
+
+    if (biggestDiff.length > limit) {
+      biggestDiff.length = limit;
+    }
+    return biggestDiff;
+  },
+  getLargestPages: function(pages, limit) {
+    pages.sort(function(page, thatPage) {
+      return thatPage.yslow.pageWeight.v - page.yslow.pageWeight.v;
+    });
+
+    if (pages.length > limit) {
+      pages.length = limit;
+    }
+    return pages;
+
+  },
+
+  getLowestScoringPages: function(pages, limit) {
+    pages.sort(function(page, thatPage) {
+      return page.score - thatPage.score;
+    });
+
+    if (pages.length > limit) {
+      pages.length = limit;
+    }
+
+    return pages;
+  }
+
+
+};