fix `We need to use the instanceToString function from dom utils inst…

…ead of toString function` (close #1055) (#1056)

src/client/utils/dom.js

@@ -96,7 +96,7 @@ function hasClassFallback (el, className) {
     return preparedElementClassName.indexOf(className) !== -1;
 }
 
-function instanceToString (instance) {
+export function instanceToString (instance) {
     if (!instanceAndPrototypeToStringAreEqual)
         return nativeMethods.objectToString.call(instance);
 

src/client/utils/style.js

@@ -5,6 +5,12 @@ import nativeMethods from '../sandbox/native-methods';
 // NOTE: For Chrome.
 const MIN_SELECT_SIZE_VALUE = 4;
 
+const NATIVE_STYLE_STRINGS = [
+    '[object CSSStyleDeclaration]',
+    '[object CSS2Properties]',
+    '[object MSStyleCSSProperties]'
+];
+
 function getIntValue (value) {
     value = value || '';
 
@@ -17,25 +23,14 @@ export function isStyle (instance) {
     if (instance instanceof nativeMethods.styleClass)
         return true;
 
-    if (instance && typeof instance === 'object' && instance.border !== void 0 &&
-        typeof instance.toString === 'function') {
-        instance = instance.toString();
-
-        return instance === '[object CSSStyleDeclaration]' || instance === '[object CSS2Properties]' ||
-               instance === '[object MSStyleCSSProperties]';
-    }
-
-    return false;
+    return NATIVE_STYLE_STRINGS.indexOf(domUtils.instanceToString(instance)) !== -1;
 }
 
 export function isStyleSheet (instance) {
     if (instance instanceof nativeMethods.styleSheetClass)
         return true;
 
-    if (instance && typeof instance === 'object' && typeof instance.toString === 'function')
-        return instance.toString() === '[object CSSStyleSheet]';
-
-    return false;
+    return domUtils.instanceToString(instance) === '[object CSSStyleSheet]';
 }
 
 export function get (el, property, doc) {

test/client/fixtures/utils/style-test.js

@@ -237,3 +237,11 @@ module('regression');
 test('isStyle throws an error for objects without the toString method (GH-561)', function () {
     ok(!styleUtils.isStyle({ border: 0, toString: void 0 }));
 });
+
+test('isStyleSheet function should not throw the "Maximum call stack size exceeded" error for objects with the overridden toString method (GH-1055)', function () {
+    ok(!styleUtils.isStyleSheet({
+        toString: function () {
+            return eval(processScript('this.href'));
+        }
+    }));
+});