Refactor prettyPrinter to work with immutable objects

[#50766813][#266]

src/core/PrettyPrinter.js

@@ -2,6 +2,7 @@ getJasmineRequireObj().pp = function(j$) {
 
   function PrettyPrinter() {
     this.ppNestLevel_ = 0;
+    this.seen = [];
   }
 
   PrettyPrinter.prototype.format = function(value) {
@@ -29,16 +30,16 @@ getJasmineRequireObj().pp = function(j$) {
         this.emitScalar('HTMLNode');
       } else if (value instanceof Date) {
         this.emitScalar('Date(' + value + ')');
-      } else if (value.__Jasmine_been_here_before__) {
+      } else if (j$.util.arrayContains(this.seen, value)) {
         this.emitScalar('<circular reference: ' + (j$.isArray_(value) ? 'Array' : 'Object') + '>');
       } else if (j$.isArray_(value) || j$.isA_('Object', value)) {
-        value.__Jasmine_been_here_before__ = true;
+        this.seen.push(value);
         if (j$.isArray_(value)) {
           this.emitArray(value);
         } else {
           this.emitObject(value);
         }
-        delete value.__Jasmine_been_here_before__;
+        this.seen.pop();
       } else {
         this.emitScalar(value.toString());
       }
@@ -50,7 +51,6 @@ getJasmineRequireObj().pp = function(j$) {
   PrettyPrinter.prototype.iterateObject = function(obj, fn) {
     for (var property in obj) {
       if (!Object.prototype.hasOwnProperty.call(obj, property)) { continue; }
-      if (property == '__Jasmine_been_here_before__') { continue; }
       fn(property, obj.__lookupGetter__ ? (!j$.util.isUndefined(obj.__lookupGetter__(property)) &&
           obj.__lookupGetter__(property) !== null) : false);
     }

src/core/util.js

@@ -30,5 +30,15 @@ getJasmineRequireObj().util = function() {
     return obj === void 0;
   };
 
+  util.arrayContains = function(array, search) {
+    var i = array.length;
+    while (i--) {
+      if (array[i] == search) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   return util;
 };