fix($parse): properly handle dots at the end of identifiers

Fixes #4613
Fixes #4912
Closes #8559

Author: pkozlowski-opensource

src/ng/parse.js

@@ -276,6 +276,16 @@ Lexer.prototype = {
       this.index++;
     }
 
+    //check if the identifier ends with . and if so move back one char
+    if (lastDot && ident[ident.length - 1] === '.') {
+      this.index--;
+      ident = ident.slice(0, -1);
+      lastDot = ident.lastIndexOf('.');
+      if (lastDot === -1) {
+        lastDot = undefined;
+      }
+    }
+
     //check if this is not a method invocation and if it is back out to last dot
     if (lastDot) {
       peekIndex = this.index;

test/ng/parseSpec.js

@@ -71,6 +71,13 @@ describe('parser', function() {
       expect(tokens[i].string).toEqual('d"e');
     });
 
+    it('should tokenize identifiers with spaces after dots', function () {
+      var tokens = lex('foo. bar');
+      expect(tokens[0].text).toEqual('foo');
+      expect(tokens[1].text).toEqual('.');
+      expect(tokens[2].text).toEqual('bar');
+    });
+
     it('should tokenize undefined', function() {
       var tokens = lex("undefined");
       var i = 0;
@@ -349,6 +356,28 @@ describe('parser', function() {
         expect(scope.$eval("x.y.z", scope)).not.toBeDefined();
       });
 
+      it('should handle white-spaces around dots in paths', function () {
+        scope.a = {b: 4};
+        expect(scope.$eval("a . b", scope)).toEqual(4);
+        expect(scope.$eval("a. b", scope)).toEqual(4);
+        expect(scope.$eval("a .b", scope)).toEqual(4);
+        expect(scope.$eval("a    . \nb", scope)).toEqual(4);
+      });
+
+      it('should throw syntax error exception for identifiers ending with a dot', function () {
+        scope.a = {b: 4};
+
+        expect(function() {
+          scope.$eval("a.", scope);
+        }).toThrowMinErr('$parse', 'syntax',
+          "Token 'null' is an unexpected token at column 2 of the expression [a.] starting at [.].");
+
+        expect(function() {
+          scope.$eval("a .", scope);
+        }).toThrowMinErr('$parse', 'syntax',
+          "Token 'null' is an unexpected token at column 3 of the expression [a .] starting at [.].");
+      });
+
       it('should resolve deeply nested paths (important for CSP mode)', function() {
         scope.a = {b: {c: {d: {e: {f: {g: {h: {i: {j: {k: {l: {m: {n: 'nooo!'}}}}}}}}}}}}};
         expect(scope.$eval("a.b.c.d.e.f.g.h.i.j.k.l.m.n", scope)).toBe('nooo!');