Cache the outputEntry sizes and the line sizes

Author: sunesimonsen

lib/utils.js

@@ -10,25 +10,41 @@ var utils = {
     },
 
     calculateOutputEntrySize: function (outputEntry) {
+        if (outputEntry.size) {
+            return outputEntry.size;
+        }
+
+        var size;
         switch (outputEntry.style) {
         case 'text':
-            return { width: String(outputEntry.args.content).length, height: 1 };
+            size = { width: String(outputEntry.args.content).length, height: 1 };
+            break;
         case 'block':
-            return utils.calculateSize(outputEntry.args);
+            size = utils.calculateSize(outputEntry.args);
+            break;
         case 'raw':
             var arg = outputEntry.args;
-            return { width: arg.width, height: arg.height };
-        default: return { width: 0, height: 0 };
+            size = { width: arg.width, height: arg.height };
+            break;
+        default: size = { width: 0, height: 0 };
         }
+
+        outputEntry.size = size;
+        return size;
     },
 
     calculateLineSize: function (line) {
+        if (line.size) {
+            return line.size;
+        }
+
         var size = { height: 1, width: 0 };
         line.forEach(function (outputEntry) {
             var outputEntrySize = utils.calculateOutputEntrySize(outputEntry);
             size.width += outputEntrySize.width;
             size.height = Math.max(outputEntrySize.height, size.height);
         });
+        line.size = size;
         return size;
     },