perf($parse): remove getterFn wrapper for internal use

Closes #8901

Author: jbedard

src/ng/parse.js

@@ -80,12 +80,21 @@ function ensureSafeFunction(obj, fullExpression) {
   }
 }
 
+//Keyword constants
+var CONSTANTS = createMap();
+forEach({
+  'null': function() { return null; },
+  'true': function() { return true; },
+  'false': function() { return false; },
+  'undefined': function() {}
+}, function(constantGetter, name) {
+  constantGetter.constant = constantGetter.literal = constantGetter.sharedGetter = true;
+  CONSTANTS[name] = constantGetter;
+});
+
+//Operators - will be wrapped by binaryFn/unaryFn/assignment/filter
 var OPERATORS = extend(createMap(), {
     /* jshint bitwise : false */
-    'null':function(){return null;},
-    'true':function(){return true;},
-    'false':function(){return false;},
-    undefined:noop,
     '+':function(self, locals, a,b){
       a=a(self, locals); b=b(self, locals);
       if (isDefined(a)) {
@@ -305,30 +314,11 @@ Lexer.prototype = {
       }
     }
 
-
-    var token = {
+    this.tokens.push({
       index: start,
-      text: ident
-    };
-
-    var fn = OPERATORS[ident];
-
-    if (fn) {
-      token.fn = fn;
-      token.constant = true;
-    } else {
-      var getter = getterFn(ident, this.options, expression);
-      // TODO(perf): consider exposing the getter reference
-      token.fn = extend(function $parsePathGetter(self, locals) {
-        return getter(self, locals);
-      }, {
-        assign: function(self, value) {
-          return setter(self, ident, value, expression);
-        }
-      });
-    }
-
-    this.tokens.push(token);
+      text: ident,
+      fn: CONSTANTS[ident] || getterFn(ident, this.options, expression)
+    });
 
     if (methodName) {
       this.tokens.push({
@@ -397,6 +387,7 @@ var Parser = function (lexer, $filter, options) {
 Parser.ZERO = extend(function () {
   return 0;
 }, {
+  sharedGetter: true,
   constant: true
 });
 
@@ -935,9 +926,14 @@ function getterFn(path, options, fullExp) {
     var evaledFnGetter = new Function('s', 'l', code); // s=scope, l=locals
     /* jshint +W054 */
     evaledFnGetter.toString = valueFn(code);
+    evaledFnGetter.assign = function(self, value) {
+      return setter(self, path, value, path);
+    };
+
     fn = evaledFnGetter;
   }
 
+  fn.sharedGetter = true;
   getterFnCache[path] = fn;
   return fn;
 }
@@ -1004,6 +1000,21 @@ function $ParseProvider() {
   this.$get = ['$filter', '$sniffer', function($filter, $sniffer) {
     $parseOptions.csp = $sniffer.csp;
 
+    function wrapSharedExpression(exp) {
+      var wrapped = exp;
+
+      if (exp.sharedGetter) {
+        wrapped = function $parseWrapper(self, locals) {
+          return exp(self, locals);
+        };
+        wrapped.literal = exp.literal;
+        wrapped.constant = exp.constant;
+        wrapped.assign = exp.assign;
+      }
+
+      return wrapped;
+    }
+
     return function $parse(exp, interceptorFn) {
       var parsedExpression, oneTime, cacheKey;
 
@@ -1026,6 +1037,9 @@ function $ParseProvider() {
             if (parsedExpression.constant) {
               parsedExpression.$$watchDelegate = constantWatchDelegate;
             } else if (oneTime) {
+              //oneTime is not part of the exp passed to the Parser so we may have to
+              //wrap the parsedExpression before adding a $$watchDelegate
+              parsedExpression = wrapSharedExpression(parsedExpression);
               parsedExpression.$$watchDelegate = parsedExpression.literal ?
                 oneTimeLiteralWatchDelegate : oneTimeWatchDelegate;
             }

test/ng/parseSpec.js

@@ -722,7 +722,7 @@ describe('parser', function() {
               scope.$eval('a.toString.constructor = 1', scope);
             }).toThrowMinErr(
                     '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
-                    'Expression: a.toString.constructor = 1');
+                    'Expression: a.toString.constructor');
           });
 
           it('should disallow traversing the Function object in a setter: E02', function() {
@@ -733,7 +733,7 @@ describe('parser', function() {
               scope.$eval('hasOwnProperty.constructor.prototype.valueOf = 1');
             }).toThrowMinErr(
                     '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
-                    'Expression: hasOwnProperty.constructor.prototype.valueOf = 1');
+                    'Expression: hasOwnProperty.constructor.prototype.valueOf');
           });
 
           it('should disallow passing the Function object as a parameter: E03', function() {