feat($parse): handle Infinity

Closes #9492

Author: btford

src/ng/parse.js

@@ -86,7 +86,8 @@ forEach({
   'null': function() { return null; },
   'true': function() { return true; },
   'false': function() { return false; },
-  'undefined': function() {}
+  'undefined': function() {},
+  'Infinity': function() { return Infinity; }
 }, function(constantGetter, name) {
   constantGetter.constant = constantGetter.literal = constantGetter.sharedGetter = true;
   CONSTANTS[name] = constantGetter;

test/ng/parseSpec.js

@@ -632,6 +632,25 @@ describe('parser', function() {
         expect(scope.a).not.toBeDefined();
       });
 
+      it('should evaluate Infinity', function() {
+        expect(scope.$eval("Infinity")).toBe(Infinity);
+        expect(scope.$eval("a=Infinity")).toBe(Infinity);
+        expect(scope.a).toBe(Infinity);
+      });
+
+      it('should evaluate -Infinity', function() {
+        expect(scope.$eval("-Infinity")).toBe(-Infinity);
+        expect(scope.$eval("a=-Infinity")).toBe(-Infinity);
+        expect(scope.a).toBe(-Infinity);
+      });
+
+      it('should dereference object properties named "Infinity"', function() {
+        scope.obj = { 'Infinity': 42 };
+        expect(scope.$eval("obj.Infinity")).toBe(42);
+        expect(scope.$eval("obj.Infinity = 43")).toBe(43);
+        expect(scope.obj.Infinity).toBe(43);
+      });
+
       it('should allow assignment after array dereference', function() {
         scope.obj = [{}];
         scope.$eval('obj[0].name=1');