Fixes and hardening for Settings.js

lib/graph3d/Graph3d.js

@@ -94,7 +94,6 @@ var DEFAULTS = {
 };
 
 
-
 // -----------------------------------------------------------------------------
 // Class Graph3d
 // -----------------------------------------------------------------------------
@@ -125,7 +124,7 @@ function Graph3d(container, data, options) {
   // create a frame and canvas
   this.create();
 
-  Settings.setDefaults(this);
+  Settings.setDefaults(DEFAULTS, this);
 
   // the column indexes
   this.colX = undefined;

lib/graph3d/Settings.js

@@ -2,6 +2,9 @@
 // This modules handles the options for Graph3d.
 //
 ////////////////////////////////////////////////////////////////////////////////
+var Camera  = require('./Camera');
+var Point3d = require('./Point3d');
+
 
 // enumerate the available styles
 var STYLE = {
@@ -89,6 +92,26 @@ var PREFIXEDOPTIONKEYS = [
 ];
 
 
+// Placeholder for DEFAULTS reference
+var DEFAULTS = undefined; 
+
+
+/**
+ * Check if given hash is empty.
+ *
+ * Source: http://stackoverflow.com/a/679937
+ */
+function isEmpty(obj) {
+  for(var prop in obj) {
+    if (obj.hasOwnProperty(prop))
+      return false;
+  }
+
+  return true;
+}
+
+
+
 /**
  * Make first letter of parameter upper case.
  *
@@ -166,13 +189,32 @@ function safeCopy(src, dst, fields, prefix) {
 }
 
 
-function setDefaults(dst) {
+/**
+ * Initialize dst with the values in src.
+ *
+ * src is the hash with the default values. 
+ * A reference DEFAULTS to this hash is stored locally for 
+ * further handling.
+ *
+ * For now, dst is assumed to be a Graph3d instance.
+ */
+function setDefaults(src, dst) {
+  if (src === undefined || isEmpty(src)) {
+    throw new Error('No DEFAULTS passed');
+  }
+  if (dst === undefined) {
+    throw new Error('No dst passed');
+  }
+
+  // Remember defaults for future reference
+  DEFAULTS = src;
+
   // Handle the defaults which can be simply copied over
-  forceCopy(DEFAULTS, dst, OPTIONKEYS);
-  forceCopy(DEFAULTS, dst, PREFIXEDOPTIONKEYS, 'default');
+  forceCopy(src, dst, OPTIONKEYS);
+  forceCopy(src, dst, PREFIXEDOPTIONKEYS, 'default');
 
   // Handle the more complex ('special') fields
-  setSpecialSettings(DEFAULTS, dst);
+  setSpecialSettings(src, dst);
 
   // Following are internal fields, not part of the user settings
   dst.margin = 10;                  // px
@@ -187,6 +229,14 @@ function setOptions(options, dst) {
   if (options === undefined) {
     return;
   }
+  if (dst === undefined) {
+    throw new Error('No dst passed');
+  }
+
+  if (DEFAULTS === undefined || isEmpty(DEFAULTS)) {
+    throw new Error('DEFAULTS not set for module Settings');
+  }
+
 
   // Handle the parameters which can be simply copied over
   safeCopy(options, dst, OPTIONKEYS);
@@ -253,7 +303,7 @@ function setShowLegend(showLegend, dst) {
  *                when not found
  */
 function getStyleNumberByName(styleName) {
-  var number = STYLENAME[stylename];
+  var number = STYLENAME[styleName];
 
   if (number === undefined) {
     return -1;