'use strict';

describe('parser', function() {

  beforeEach(function() {
    // clear caches
    getterFnCache = {};
    promiseWarningCache = {};
  });


  describe('lexer', function() {
    var lex;

    beforeEach(function () {
      lex = function () {
        var lexer = new Lexer({csp: false, unwrapPromises: false});
        return lexer.lex.apply(lexer, arguments);
      };
    });

    it('should tokenize a string', function() {
      var tokens = lex("a.bc[22]+1.3|f:'a\\\'c':\"d\\\"e\"");
      var i = 0;
      expect(tokens[i].index).toEqual(0);
      expect(tokens[i].text).toEqual('a.bc');

      i++;
      expect(tokens[i].index).toEqual(4);
      expect(tokens[i].text).toEqual('[');

      i++;
      expect(tokens[i].index).toEqual(5);
      expect(tokens[i].text).toEqual(22);

      i++;
      expect(tokens[i].index).toEqual(7);
      expect(tokens[i].text).toEqual(']');

      i++;
      expect(tokens[i].index).toEqual(8);
      expect(tokens[i].text).toEqual('+');

      i++;
      expect(tokens[i].index).toEqual(9);
      expect(tokens[i].text).toEqual(1.3);

      i++;
      expect(tokens[i].index).toEqual(12);
      expect(tokens[i].text).toEqual('|');

      i++;
      expect(tokens[i].index).toEqual(13);
      expect(tokens[i].text).toEqual('f');

      i++;
      expect(tokens[i].index).toEqual(14);
      expect(tokens[i].text).toEqual(':');

      i++;
      expect(tokens[i].index).toEqual(15);
      expect(tokens[i].string).toEqual("a'c");

      i++;
      expect(tokens[i].index).toEqual(21);
      expect(tokens[i].text).toEqual(':');

      i++;
      expect(tokens[i].index).toEqual(22);
      expect(tokens[i].string).toEqual('d"e');
    });

    it('should tokenize undefined', function() {
      var tokens = lex("undefined");
      var i = 0;
      expect(tokens[i].index).toEqual(0);
      expect(tokens[i].text).toEqual('undefined');
      expect(undefined).toEqual(tokens[i].fn());
    });

    it('should tokenize quoted string', function() {
      var str = "['\\'', \"\\\"\"]";
      var tokens = lex(str);

      expect(tokens[1].index).toEqual(1);
      expect(tokens[1].string).toEqual("'");

      expect(tokens[3].index).toEqual(7);
      expect(tokens[3].string).toEqual('"');
    });

    it('should tokenize escaped quoted string', function() {
      var str = '"\\"\\n\\f\\r\\t\\v\\u00A0"';
      var tokens = lex(str);

      expect(tokens[0].string).toEqual('"\n\f\r\t\v\u00A0');
    });

    it('should tokenize unicode', function() {
      var tokens = lex('"\\u00A0"');
      expect(tokens.length).toEqual(1);
      expect(tokens[0].string).toEqual('\u00a0');
    });

    it('should ignore whitespace', function() {
      var tokens = lex("a \t \n \r b");
      expect(tokens[0].text).toEqual('a');
      expect(tokens[1].text).toEqual('b');
    });

    it('should tokenize relation and equality', function() {
      var tokens = lex("! == != < > <= >= === !==");
      expect(tokens[0].text).toEqual('!');
      expect(tokens[1].text).toEqual('==');
      expect(tokens[2].text).toEqual('!=');
      expect(tokens[3].text).toEqual('<');
      expect(tokens[4].text).toEqual('>');
      expect(tokens[5].text).toEqual('<=');
      expect(tokens[6].text).toEqual('>=');
      expect(tokens[7].text).toEqual('===');
      expect(tokens[8].text).toEqual('!==');
    });

    it('should tokenize logical and ternary', function() {
      var tokens = lex("&& || ? :");
      expect(tokens[0].text).toEqual('&&');
      expect(tokens[1].text).toEqual('||');
      expect(tokens[2].text).toEqual('?');
      expect(tokens[3].text).toEqual(':');
    });

    it('should tokenize statements', function() {
      var tokens = lex("a;b;");
      expect(tokens[0].text).toEqual('a');
      expect(tokens[1].text).toEqual(';');
      expect(tokens[2].text).toEqual('b');
      expect(tokens[3].text).toEqual(';');
    });

    it('should tokenize function invocation', function() {
      var tokens = lex("a()");
      expect(map(tokens, function(t) { return t.text;})).toEqual(['a', '(', ')']);
    });

    it('should tokenize method invocation', function() {
      var tokens = lex("a.b.c (d) - e.f()");
      expect(map(tokens, function(t) { return t.text;})).
          toEqual(['a.b', '.', 'c',  '(', 'd', ')', '-', 'e', '.', 'f', '(', ')']);
    });

    it('should tokenize number', function() {
      var tokens = lex("0.5");
      expect(tokens[0].text).toEqual(0.5);
    });

    it('should tokenize negative number', inject(function($rootScope) {
      var value = $rootScope.$eval("-0.5");
      expect(value).toEqual(-0.5);

      value = $rootScope.$eval("{a:-0.5}");
      expect(value).toEqual({a:-0.5});
    }));

    it('should tokenize number with exponent', inject(function($rootScope) {
      var tokens = lex("0.5E-10");
      expect(tokens[0].text).toEqual(0.5E-10);
      expect($rootScope.$eval("0.5E-10")).toEqual(0.5E-10);

      tokens = lex("0.5E+10");
      expect(tokens[0].text).toEqual(0.5E+10);
    }));

    it('should throws exception for invalid exponent', function() {
      expect(function() {
        lex("0.5E-");
      }).toThrowMinErr('$parse', 'lexerr', 'Lexer Error: Invalid exponent at column 4 in expression [0.5E-].');

      expect(function() {
        lex("0.5E-A");
      }).toThrowMinErr('$parse', 'lexerr', 'Lexer Error: Invalid exponent at column 4 in expression [0.5E-A].');
    });

    it('should tokenize number starting with a dot', function() {
      var tokens = lex(".5");
      expect(tokens[0].text).toEqual(0.5);
    });

    it('should throw error on invalid unicode', function() {
      expect(function() {
        lex("'\\u1''bla'");
      }).toThrowMinErr("$parse", "lexerr", "Lexer Error: Invalid unicode escape [\\u1''b] at column 2 in expression ['\\u1''bla'].");
    });
  });

  var $filterProvider, scope;

  beforeEach(module(['$filterProvider', function (filterProvider) {
    $filterProvider = filterProvider;
  }]));


  forEach([true, false], function(cspEnabled) {
    forEach([true, false], function(unwrapPromisesEnabled) {

      describe('csp: ' + cspEnabled + ", unwrapPromises: " + unwrapPromisesEnabled, function() {

        var originalSecurityPolicy;


        beforeEach(function() {
          originalSecurityPolicy = window.document.securityPolicy;
          window.document.securityPolicy = {isActive : cspEnabled};
        });

        afterEach(function() {
          window.document.securityPolicy = originalSecurityPolicy;
        });

        beforeEach(module(function ($parseProvider, $provide) {
          $parseProvider.unwrapPromises(unwrapPromisesEnabled);
        }));

        beforeEach(inject(function ($rootScope) {
          scope = $rootScope;
        }));

        it('should parse expressions', function() {
          expect(scope.$eval("-1")).toEqual(-1);
          expect(scope.$eval("1 + 2.5")).toEqual(3.5);
          expect(scope.$eval("1 + -2.5")).toEqual(-1.5);
          expect(scope.$eval("1+2*3/4")).toEqual(1+2*3/4);
          expect(scope.$eval("0--1+1.5")).toEqual(0- -1 + 1.5);
          expect(scope.$eval("-0--1++2*-3/-4")).toEqual(-0- -1+ +2*-3/-4);
          expect(scope.$eval("1/2*3")).toEqual(1/2*3);
        });

        it('should parse comparison', function() {
          expect(scope.$eval("false")).toBeFalsy();
          expect(scope.$eval("!true")).toBeFalsy();
          expect(scope.$eval("1==1")).toBeTruthy();
          expect(scope.$eval("1==true")).toBeTruthy();
          expect(scope.$eval("1===1")).toBeTruthy();
          expect(scope.$eval("1==='1'")).toBeFalsy();
          expect(scope.$eval("1===true")).toBeFalsy();
          expect(scope.$eval("'true'===true")).toBeFalsy();
          expect(scope.$eval("1!==2")).toBeTruthy();
          expect(scope.$eval("1!=='1'")).toBeTruthy();
          expect(scope.$eval("1!=2")).toBeTruthy();
          expect(scope.$eval("1<2")).toBeTruthy();
          expect(scope.$eval("1<=1")).toBeTruthy();
          expect(scope.$eval("1>2")).toEqual(1>2);
          expect(scope.$eval("2>=1")).toEqual(2>=1);
          expect(scope.$eval("true==2<3")).toEqual(true == 2<3);
          expect(scope.$eval("true===2<3")).toEqual(true === 2<3);
        });

        it('should parse logical', function() {
          expect(scope.$eval("0&&2")).toEqual(0&&2);
          expect(scope.$eval("0||2")).toEqual(0||2);
          expect(scope.$eval("0||1&&2")).toEqual(0||1&&2);
        });

        it('should parse ternary', function(){
          var returnTrue = scope.returnTrue = function(){ return true; };
          var returnFalse = scope.returnFalse = function(){ return false; };
          var returnString = scope.returnString = function(){ return 'asd'; };
          var returnInt = scope.returnInt = function(){ return 123; };
          var identity = scope.identity = function(x){ return x; };

          // Simple.
          expect(scope.$eval('0?0:2')).toEqual(0?0:2);
          expect(scope.$eval('1?0:2')).toEqual(1?0:2);

          // Nested on the left.
          expect(scope.$eval('0?0?0:0:2')).toEqual(0?0?0:0:2);
          expect(scope.$eval('1?0?0:0:2')).toEqual(1?0?0:0:2);
          expect(scope.$eval('0?1?0:0:2')).toEqual(0?1?0:0:2);
          expect(scope.$eval('0?0?1:0:2')).toEqual(0?0?1:0:2);
          expect(scope.$eval('0?0?0:2:3')).toEqual(0?0?0:2:3);
          expect(scope.$eval('1?1?0:0:2')).toEqual(1?1?0:0:2);
          expect(scope.$eval('1?1?1:0:2')).toEqual(1?1?1:0:2);
          expect(scope.$eval('1?1?1:2:3')).toEqual(1?1?1:2:3);
          expect(scope.$eval('1?1?1:2:3')).toEqual(1?1?1:2:3);

          // Nested on the right.
          expect(scope.$eval('0?0:0?0:2')).toEqual(0?0:0?0:2);
          expect(scope.$eval('1?0:0?0:2')).toEqual(1?0:0?0:2);
          expect(scope.$eval('0?1:0?0:2')).toEqual(0?1:0?0:2);
          expect(scope.$eval('0?0:1?0:2')).toEqual(0?0:1?0:2);
          expect(scope.$eval('0?0:0?2:3')).toEqual(0?0:0?2:3);
          expect(scope.$eval('1?1:0?0:2')).toEqual(1?1:0?0:2);
          expect(scope.$eval('1?1:1?0:2')).toEqual(1?1:1?0:2);
          expect(scope.$eval('1?1:1?2:3')).toEqual(1?1:1?2:3);
          expect(scope.$eval('1?1:1?2:3')).toEqual(1?1:1?2:3);

          // Precedence with respect to logical operators.
          expect(scope.$eval('0&&1?0:1')).toEqual(0&&1?0:1);
          expect(scope.$eval('1||0?0:0')).toEqual(1||0?0:0);

          expect(scope.$eval('0?0&&1:2')).toEqual(0?0&&1:2);
          expect(scope.$eval('0?1&&1:2')).toEqual(0?1&&1:2);
          expect(scope.$eval('0?0||0:1')).toEqual(0?0||0:1);
          expect(scope.$eval('0?0||1:2')).toEqual(0?0||1:2);

          expect(scope.$eval('1?0&&1:2')).toEqual(1?0&&1:2);
          expect(scope.$eval('1?1&&1:2')).toEqual(1?1&&1:2);
          expect(scope.$eval('1?0||0:1')).toEqual(1?0||0:1);
          expect(scope.$eval('1?0||1:2')).toEqual(1?0||1:2);

          expect(scope.$eval('0?1:0&&1')).toEqual(0?1:0&&1);
          expect(scope.$eval('0?2:1&&1')).toEqual(0?2:1&&1);
          expect(scope.$eval('0?1:0||0')).toEqual(0?1:0||0);
          expect(scope.$eval('0?2:0||1')).toEqual(0?2:0||1);

          expect(scope.$eval('1?1:0&&1')).toEqual(1?1:0&&1);
          expect(scope.$eval('1?2:1&&1')).toEqual(1?2:1&&1);
          expect(scope.$eval('1?1:0||0')).toEqual(1?1:0||0);
          expect(scope.$eval('1?2:0||1')).toEqual(1?2:0||1);

          // Function calls.
          expect(scope.$eval('returnTrue() ? returnString() : returnInt()')).toEqual(returnTrue() ? returnString() : returnInt());
          expect(scope.$eval('returnFalse() ? returnString() : returnInt()')).toEqual(returnFalse() ? returnString() : returnInt());
          expect(scope.$eval('returnTrue() ? returnString() : returnInt()')).toEqual(returnTrue() ? returnString() : returnInt());
          expect(scope.$eval('identity(returnFalse() ? returnString() : returnInt())')).toEqual(identity(returnFalse() ? returnString() : returnInt()));
        });

        it('should parse string', function() {
          expect(scope.$eval("'a' + 'b c'")).toEqual("ab c");
        });

        it('should parse filters', function() {
          $filterProvider.register('substring', valueFn(function(input, start, end) {
            return input.substring(start, end);
          }));

          expect(function() {
            scope.$eval("1|nonexistent");
          }).toThrowMinErr('$injector', 'unpr', 'Unknown provider: nonexistentFilterProvider <- nonexistentFilter');

          scope.offset =  3;
          expect(scope.$eval("'abcd'|substring:1:offset")).toEqual("bc");
          expect(scope.$eval("'abcd'|substring:1:3|uppercase")).toEqual("BC");
        });

        it('should access scope', function() {
          scope.a =  123;
          scope.b = {c: 456};
          expect(scope.$eval("a", scope)).toEqual(123);
          expect(scope.$eval("b.c", scope)).toEqual(456);
          expect(scope.$eval("x.y.z", scope)).not.toBeDefined();
        });

        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!');
        });

        forEach([2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 42, 99], function(pathLength) {
          it('should resolve nested paths of length ' + pathLength, function() {
            // Create a nested object {x2: {x3: {x4: ... {x[n]: 42} ... }}}.
            var obj = 42, locals = {};
            for (var i = pathLength; i >= 2; i--) {
              var newObj = {};
              newObj['x' + i] = obj;
              obj = newObj;
            }
            // Assign to x1 and build path 'x1.x2.x3. ... .x[n]' to access the final value.
            scope.x1 = obj;
            var path = 'x1';
            for (var i = 2; i <= pathLength; i++) {
              path += '.x' + i;
            }
            expect(scope.$eval(path)).toBe(42);
            locals['x' + pathLength] = 'not 42'
            expect(scope.$eval(path, locals)).toBe(42);
          });
        });

        it('should be forgiving', function() {
          scope.a = {b: 23};
          expect(scope.$eval('b')).toBeUndefined();
          expect(scope.$eval('a.x')).toBeUndefined();
          expect(scope.$eval('a.b.c.d')).toBeUndefined();
        });

        it('should support property names that collide with native object properties', function() {
          // regression
          scope.watch = 1;
          scope.toString = function toString() {
            return "custom toString";
          };

          expect(scope.$eval('watch', scope)).toBe(1);
          expect(scope.$eval('toString()', scope)).toBe('custom toString');
        });

        it('should not break if hasOwnProperty is referenced in an expression', function() {
          scope.obj = { value: 1};
          // By evaluating an expression that calls hasOwnProperty, the getterFnCache
          // will store a property called hasOwnProperty.  This is effectively:
          // getterFnCache['hasOwnProperty'] = null
          scope.$eval('obj.hasOwnProperty("value")');
          // If we rely on this property then evaluating any expression will fail
          // because it is not able to find out if obj.value is there in the cache
          expect(scope.$eval('obj.value')).toBe(1);
        });

        it('should not break if the expression is "hasOwnProperty"', function() {
          scope.fooExp = 'barVal';
          // By evaluating hasOwnProperty, the $parse cache will store a getter for
          // the scope's own hasOwnProperty function, which will mess up future cache look ups.
          // i.e. cache['hasOwnProperty'] = function(scope) { return scope.hasOwnProperty; }
          scope.$eval('hasOwnProperty');
          expect(scope.$eval('fooExp')).toBe('barVal');
        });

        it('should evaluate grouped expressions', function() {
          expect(scope.$eval("(1+2)*3")).toEqual((1+2)*3);
        });

        it('should evaluate assignments', function() {
          expect(scope.$eval("a=12")).toEqual(12);
          expect(scope.a).toEqual(12);

          expect(scope.$eval("x.y.z=123;")).toEqual(123);
          expect(scope.x.y.z).toEqual(123);

          expect(scope.$eval("a=123; b=234")).toEqual(234);
          expect(scope.a).toEqual(123);
          expect(scope.b).toEqual(234);
        });

        it('should evaluate function call without arguments', function() {
          scope['const'] =  function(a,b){return 123;};
          expect(scope.$eval("const()")).toEqual(123);
        });

        it('should evaluate function call with arguments', function() {
          scope.add =  function(a,b) {
            return a+b;
          };
          expect(scope.$eval("add(1,2)")).toEqual(3);
        });

        it('should evaluate function call from a return value', function() {
          scope.val = 33;
          scope.getter = function() { return function() { return this.val; }};
          expect(scope.$eval("getter()()")).toBe(33);
        });

        it('should evaluate multiplication and division', function() {
          scope.taxRate =  8;
          scope.subTotal =  100;
          expect(scope.$eval("taxRate / 100 * subTotal")).toEqual(8);
          expect(scope.$eval("subTotal * taxRate / 100")).toEqual(8);
        });

        it('should evaluate array', function() {
          expect(scope.$eval("[]").length).toEqual(0);
          expect(scope.$eval("[1, 2]").length).toEqual(2);
          expect(scope.$eval("[1, 2]")[0]).toEqual(1);
          expect(scope.$eval("[1, 2]")[1]).toEqual(2);
          expect(scope.$eval("[1, 2,]")[1]).toEqual(2);
          expect(scope.$eval("[1, 2,]").length).toEqual(2);
        });

        it('should evaluate array access', function() {
          expect(scope.$eval("[1][0]")).toEqual(1);
          expect(scope.$eval("[[1]][0][0]")).toEqual(1);
          expect(scope.$eval("[].length")).toEqual(0);
          expect(scope.$eval("[1, 2].length")).toEqual(2);
        });

        it('should evaluate object', function() {
          expect(toJson(scope.$eval("{}"))).toEqual("{}");
          expect(toJson(scope.$eval("{a:'b'}"))).toEqual('{"a":"b"}');
          expect(toJson(scope.$eval("{'a':'b'}"))).toEqual('{"a":"b"}');
          expect(toJson(scope.$eval("{\"a\":'b'}"))).toEqual('{"a":"b"}');
          expect(toJson(scope.$eval("{a:'b',}"))).toEqual('{"a":"b"}');
          expect(toJson(scope.$eval("{'a':'b',}"))).toEqual('{"a":"b"}');
          expect(toJson(scope.$eval("{\"a\":'b',}"))).toEqual('{"a":"b"}');
        });

        it('should evaluate object access', function() {
          expect(scope.$eval("{false:'WC', true:'CC'}[false]")).toEqual("WC");
        });

        it('should evaluate JSON', function() {
          expect(toJson(scope.$eval("[{}]"))).toEqual("[{}]");
          expect(toJson(scope.$eval("[{a:[]}, {b:1}]"))).toEqual('[{"a":[]},{"b":1}]');
        });

        it('should evaluate multiple statements', function() {
          expect(scope.$eval("a=1;b=3;a+b")).toEqual(4);
          expect(scope.$eval(";;1;;")).toEqual(1);
        });

        it('should evaluate object methods in correct context (this)', function() {
          var C = function () {
            this.a = 123;
          };
          C.prototype.getA = function() {
            return this.a;
          };

          scope.obj = new C();
          expect(scope.$eval("obj.getA()")).toEqual(123);
          expect(scope.$eval("obj['getA']()")).toEqual(123);
        });

        it('should evaluate methods in correct context (this) in argument', function() {
          var C = function () {
            this.a = 123;
          };
          C.prototype.sum = function(value) {
            return this.a + value;
          };
          C.prototype.getA = function() {
            return this.a;
          };

          scope.obj = new C();
          expect(scope.$eval("obj.sum(obj.getA())")).toEqual(246);
          expect(scope.$eval("obj['sum'](obj.getA())")).toEqual(246);
        });

        it('should evaluate objects on scope context', function() {
          scope.a =  "abc";
          expect(scope.$eval("{a:a}").a).toEqual("abc");
        });

        it('should evaluate field access on function call result', function() {
          scope.a =  function() {
            return {name:'misko'};
          };
          expect(scope.$eval("a().name")).toEqual("misko");
        });

        it('should evaluate field access after array access', function () {
          scope.items =  [{}, {name:'misko'}];
          expect(scope.$eval('items[1].name')).toEqual("misko");
        });

        it('should evaluate array assignment', function() {
          scope.items =  [];

          expect(scope.$eval('items[1] = "abc"')).toEqual("abc");
          expect(scope.$eval('items[1]')).toEqual("abc");
      //    Dont know how to make this work....
      //    expect(scope.$eval('books[1] = "moby"')).toEqual("moby");
      //    expect(scope.$eval('books[1]')).toEqual("moby");
        });

        it('should evaluate grouped filters', function() {
          scope.name = 'MISKO';
          expect(scope.$eval('n = (name|lowercase)')).toEqual('misko');
          expect(scope.$eval('n')).toEqual('misko');
        });

        it('should evaluate remainder', function() {
          expect(scope.$eval('1%2')).toEqual(1);
        });

        it('should evaluate sum with undefined', function() {
          expect(scope.$eval('1+undefined')).toEqual(1);
          expect(scope.$eval('undefined+1')).toEqual(1);
        });

        it('should throw exception on non-closed bracket', function() {
          expect(function() {
            scope.$eval('[].count(');
          }).toThrowMinErr('$parse', 'ueoe', 'Unexpected end of expression: [].count(');
        });

        it('should evaluate double negation', function() {
          expect(scope.$eval('true')).toBeTruthy();
          expect(scope.$eval('!true')).toBeFalsy();
          expect(scope.$eval('!!true')).toBeTruthy();
          expect(scope.$eval('{true:"a", false:"b"}[!!true]')).toEqual('a');
        });

        it('should evaluate negation', function() {
          expect(scope.$eval("!false || true")).toEqual(!false || true);
          expect(scope.$eval("!11 == 10")).toEqual(!11 == 10);
          expect(scope.$eval("12/6/2")).toEqual(12/6/2);
        });

        it('should evaluate exclamation mark', function() {
          expect(scope.$eval('suffix = "!"')).toEqual('!');
        });

        it('should evaluate minus', function() {
          expect(scope.$eval("{a:'-'}")).toEqual({a: "-"});
        });

        it('should evaluate undefined', function() {
          expect(scope.$eval("undefined")).not.toBeDefined();
          expect(scope.$eval("a=undefined")).not.toBeDefined();
          expect(scope.a).not.toBeDefined();
        });

        it('should allow assignment after array dereference', function() {
          scope.obj = [{}];
          scope.$eval('obj[0].name=1');
          expect(scope.obj.name).toBeUndefined();
          expect(scope.obj[0].name).toEqual(1);
        });

        it('should short-circuit AND operator', function() {
          scope.run = function() {
            throw "IT SHOULD NOT HAVE RUN";
          };
          expect(scope.$eval('false && run()')).toBe(false);
        });

        it('should short-circuit OR operator', function() {
          scope.run = function() {
            throw "IT SHOULD NOT HAVE RUN";
          };
          expect(scope.$eval('true || run()')).toBe(true);
        });


        it('should support method calls on primitive types', function() {
          scope.empty = '';
          scope.zero = 0;
          scope.bool = false;

          expect(scope.$eval('empty.substr(0)')).toBe('');
          expect(scope.$eval('zero.toString()')).toBe('0');
          expect(scope.$eval('bool.toString()')).toBe('false');
        });

        it('should evaluate expressions with line terminators', function() {
          scope.a = "a";
          scope.b = {c: "bc"};
          expect(scope.$eval('a + \n b.c + \r "\td" + \t \r\n\r "\r\n\n"')).toEqual("abc\td\r\n\n");
        });

        describe('sandboxing', function() {
          describe('Function constructor', function() {
            it('should NOT allow access to Function constructor in getter', function() {
              expect(function() {
                scope.$eval('{}.toString.constructor');
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: {}.toString.constructor');

              expect(function() {
                scope.$eval('{}.toString.constructor("alert(1)")');
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: {}.toString.constructor("alert(1)")');

              expect(function() {
                scope.$eval('[].toString.constructor.foo');
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: [].toString.constructor.foo');

              expect(function() {
                scope.$eval('{}.toString["constructor"]');
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                      'Expression: {}.toString["constructor"]');
              expect(function() {
                scope.$eval('{}["toString"]["constructor"]');
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                      'Expression: {}["toString"]["constructor"]');

              scope.a = [];
              expect(function() {
                scope.$eval('a.toString.constructor', scope);
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: a.toString.constructor');
              expect(function() {
                scope.$eval('a.toString["constructor"]', scope);
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                      'Expression: a.toString["constructor"]');
            });

            it('should NOT allow access to Function constructor in setter', function() {
              expect(function() {
                scope.$eval('{}.toString.constructor = 1');
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: {}.toString.constructor = 1');

              expect(function() {
                scope.$eval('{}.toString.constructor.a = 1');
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: {}.toString.constructor.a = 1');

              expect(function() {
                scope.$eval('{}.toString["constructor"]["constructor"] = 1');
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                      'Expression: {}.toString["constructor"]["constructor"] = 1');


              scope.key1 = "const";
              scope.key2 = "ructor";
              expect(function() {
                scope.$eval('{}.toString[key1 + key2].foo = 1');
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                          'Expression: {}.toString[key1 + key2].foo = 1');

              expect(function() {
                scope.$eval('{}.toString["constructor"]["a"] = 1');
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                      'Expression: {}.toString["constructor"]["a"] = 1');

              scope.a = [];
              expect(function() {
                scope.$eval('a.toString.constructor = 1', scope);
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: a.toString.constructor = 1');
            });


            it('should NOT allow access to Function constructor that has been aliased', function() {
              scope.foo = { "bar": Function };
              expect(function() {
                scope.$eval('foo["bar"]');
              }).toThrowMinErr(
                      '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                      'Expression: foo["bar"]');

            });


            it('should NOT allow access to Function constructor in getter', function() {
              expect(function() {
                scope.$eval('{}.toString.constructor');
              }).toThrowMinErr(
                      '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                      'Expression: {}.toString.constructor');
            });
          });


          describe('Window and $element/node', function() {
            it('should NOT allow access to the Window or DOM when indexing', inject(function($window, $document) {
              scope.wrap = {w: $window, d: $document};

              expect(function() {
                scope.$eval('wrap["w"]', scope);
              }).toThrowMinErr(
                      '$parse', 'isecwindow', 'Referencing the Window in Angular expressions is ' +
                      'disallowed! Expression: wrap["w"]');
              expect(function() {
                scope.$eval('wrap["d"]', scope);
              }).toThrowMinErr(
                      '$parse', 'isecdom', 'Referencing DOM nodes in Angular expressions is ' +
                      'disallowed! Expression: wrap["d"]');
            }));

            it('should NOT allow access to the Window or DOM returned from a function', inject(function($window, $document) {
              scope.getWin = valueFn($window);
              scope.getDoc = valueFn($document);

              expect(function() {
                scope.$eval('getWin()', scope);
              }).toThrowMinErr(
                      '$parse', 'isecwindow', 'Referencing the Window in Angular expressions is ' +
                      'disallowed! Expression: getWin()');
              expect(function() {
                scope.$eval('getDoc()', scope);
              }).toThrowMinErr(
                      '$parse', 'isecdom', 'Referencing DOM nodes in Angular expressions is ' +
                      'disallowed! Expression: getDoc()');
            }));

            it('should NOT allow calling functions on Window or DOM', inject(function($window, $document) {
              scope.a = {b: { win: $window, doc: $document }};
              expect(function() {
                scope.$eval('a.b.win.alert(1)', scope);
              }).toThrowMinErr(
                      '$parse', 'isecwindow', 'Referencing the Window in Angular expressions is ' +
                      'disallowed! Expression: a.b.win.alert(1)');
              expect(function() {
                scope.$eval('a.b.doc.on("click")', scope);
              }).toThrowMinErr(
                      '$parse', 'isecdom', 'Referencing DOM nodes in Angular expressions is ' +
                      'disallowed! Expression: a.b.doc.on("click")');
            }));

            // Issue #4805
            it('should NOT throw isecdom when referencing a Backbone Collection', function() {
              // Backbone stuff is sort of hard to mock, if you have a better way of doing this,
              // please fix this.
              var fakeBackboneCollection = {
                children: [{}, {}, {}],
                find: function() {},
                on: function() {},
                off: function() {},
                bind: function() {}
              };
              scope.backbone = fakeBackboneCollection;
              expect(function() { scope.$eval('backbone'); }).not.toThrow();
            });

            it('should NOT throw isecdom when referencing an array with node properties', function() {
              var array = [1,2,3];
              array.on = array.attr = array.prop = array.bind = true;
              scope.array = array;
              expect(function() { scope.$eval('array'); }).not.toThrow();
            });
          });
        });

        describe('overriding constructor', function() {
          it('should evaluate grouped expressions', function() {
            scope.foo = function foo() {
              return "foo";
            };
            // When not overridden, access should be restricted both by the dot operator and by the
            // index operator.
            expect(function() {
              scope.$eval('foo.constructor()', scope)
            }).toThrowMinErr(
                    '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                    'Expression: foo.constructor()');
            expect(function() {
              scope.$eval('foo["constructor"]()', scope)
            }).toThrowMinErr(
                    '$parse', 'isecfn', 'Referencing Function in Angular expressions is disallowed! ' +
                    'Expression: foo["constructor"]()');

            // User defined value assigned to constructor.
            scope.foo.constructor = function constructor() {
              return "custom constructor";
            };
            // Dot operator should still block it.
            expect(function() {
              scope.$eval('foo.constructor()', scope)
            }).toThrowMinErr(
                    '$parse', 'isecfld', 'Referencing "constructor" field in Angular expressions is disallowed! ' +
                    'Expression: foo.constructor()');
            // However, the index operator should allow it.
            expect(scope.$eval('foo["constructor"]()', scope)).toBe('custom constructor');
          });
        });

        it('should call the function from the received instance and not from a new one', function() {
          var n = 0;
          scope.fn = function() {
            var c = n++;
            return { c: c, anotherFn: function() { return this.c == c; } };
          };
          expect(scope.$eval('fn().anotherFn()')).toBe(true);
        });


        it('should call the function once when it is part of the context', function() {
          var count = 0;
          scope.fn = function() {
            count++;
            return { anotherFn: function() { return "lucas"; } };
          };
          expect(scope.$eval('fn().anotherFn()')).toBe('lucas');
          expect(count).toBe(1);
        });


        it('should call the function once when it is not part of the context', function() {
          var count = 0;
          scope.fn = function() {
            count++;
            return function() { return 'lucas'; };
          };
          expect(scope.$eval('fn()()')).toBe('lucas');
          expect(count).toBe(1);
        });


        it('should call the function once when it is part of the context on assignments', function() {
          var count = 0;
          var element = {};
          scope.fn = function() {
            count++;
            return element;
          };
          expect(scope.$eval('fn().name = "lucas"')).toBe('lucas');
          expect(element.name).toBe('lucas');
          expect(count).toBe(1);
        });


        it('should call the function once when it is part of the context on array lookups', function() {
          var count = 0;
          var element = [];
          scope.fn = function() {
            count++;
            return element;
          };
          expect(scope.$eval('fn()[0] = "lucas"')).toBe('lucas');
          expect(element[0]).toBe('lucas');
          expect(count).toBe(1);
        });


        it('should call the function once when it is part of the context on array lookup function', function() {
          var count = 0;
          var element = [{anotherFn: function() { return 'lucas';} }];
          scope.fn = function() {
            count++;
            return element;
          };
          expect(scope.$eval('fn()[0].anotherFn()')).toBe('lucas');
          expect(count).toBe(1);
        });


        it('should call the function once when it is part of the context on property lookup function', function() {
          var count = 0;
          var element = {name: {anotherFn: function() { return 'lucas';} } };
          scope.fn = function() {
            count++;
            return element;
          };
          expect(scope.$eval('fn().name.anotherFn()')).toBe('lucas');
          expect(count).toBe(1);
        });


        it('should call the function once when it is part of a sub-expression', function() {
          var count = 0;
          scope.element = [{}];
          scope.fn = function() {
            count++;
            return 0;
          };
          expect(scope.$eval('element[fn()].name = "lucas"')).toBe('lucas');
          expect(scope.element[0].name).toBe('lucas');
          expect(count).toBe(1);
        });


        describe('assignable', function() {
          it('should expose assignment function', inject(function($parse) {
            var fn = $parse('a');
            expect(fn.assign).toBeTruthy();
            var scope = {};
            fn.assign(scope, 123);
            expect(scope).toEqual({a:123});
          }));
        });


        describe('locals', function() {
          it('should expose local variables', inject(function($parse) {
            expect($parse('a')({a: 0}, {a: 1})).toEqual(1);
            expect($parse('add(a,b)')({b: 1, add: function(a, b) { return a + b; }}, {a: 2})).toEqual(3);
          }));

          it('should expose traverse locals', inject(function($parse) {
            expect($parse('a.b')({a: {b: 0}}, {a: {b:1}})).toEqual(1);
            expect($parse('a.b')({a: null}, {a: {b:1}})).toEqual(1);
            expect($parse('a.b')({a: {b: 0}}, {a: null})).toEqual(undefined);
            expect($parse('a.b.c')({a: null}, {a: {b: {c: 1}}})).toEqual(1);
          }));

          it('should not use locals to resolve object properties', inject(function($parse) {
            expect($parse('a[0].b')({a: [ {b : 'scope'} ]}, {b : 'locals'})).toBe('scope');
            expect($parse('a[0]["b"]')({a: [ {b : 'scope'} ]}, {b : 'locals'})).toBe('scope');
            expect($parse('a[0][0].b')({a: [[{b : 'scope'}]]}, {b : 'locals'})).toBe('scope');
            expect($parse('a[0].b.c')({a: [ {b: {c: 'scope'}}] }, {b : {c: 'locals'} })).toBe('scope');
          }));
        });

        describe('literal', function() {
          it('should mark scalar value expressions as literal', inject(function($parse) {
            expect($parse('0').literal).toBe(true);
            expect($parse('"hello"').literal).toBe(true);
            expect($parse('true').literal).toBe(true);
            expect($parse('false').literal).toBe(true);
            expect($parse('null').literal).toBe(true);
            expect($parse('undefined').literal).toBe(true);
          }));

          it('should mark array expressions as literal', inject(function($parse) {
            expect($parse('[]').literal).toBe(true);
            expect($parse('[1, 2, 3]').literal).toBe(true);
            expect($parse('[1, identifier]').literal).toBe(true);
          }));

          it('should mark object expressions as literal', inject(function($parse) {
            expect($parse('{}').literal).toBe(true);
            expect($parse('{x: 1}').literal).toBe(true);
            expect($parse('{foo: bar}').literal).toBe(true);
          }));

          it('should not mark function calls or operator expressions as literal', inject(function($parse) {
            expect($parse('1 + 1').literal).toBe(false);
            expect($parse('call()').literal).toBe(false);
            expect($parse('[].length').literal).toBe(false);
          }));
        });

        describe('constant', function() {
          it('should mark scalar value expressions as constant', inject(function($parse) {
            expect($parse('12.3').constant).toBe(true);
            expect($parse('"string"').constant).toBe(true);
            expect($parse('true').constant).toBe(true);
            expect($parse('false').constant).toBe(true);
            expect($parse('null').constant).toBe(true);
            expect($parse('undefined').constant).toBe(true);
          }));

          it('should mark arrays as constant if they only contain constant elements', inject(function($parse) {
            expect($parse('[]').constant).toBe(true);
            expect($parse('[1, 2, 3]').constant).toBe(true);
            expect($parse('["string", null]').constant).toBe(true);
            expect($parse('[[]]').constant).toBe(true);
            expect($parse('[1, [2, 3], {4: 5}]').constant).toBe(true);
          }));

          it('should not mark arrays as constant if they contain any non-constant elements', inject(function($parse) {
            expect($parse('[foo]').constant).toBe(false);
            expect($parse('[x + 1]').constant).toBe(false);
            expect($parse('[bar[0]]').constant).toBe(false);
          }));

          it('should mark complex expressions involving constant values as constant', inject(function($parse) {
            expect($parse('!true').constant).toBe(true);
            expect($parse('1 - 1').constant).toBe(true);
            expect($parse('"foo" + "bar"').constant).toBe(true);
            expect($parse('5 != null').constant).toBe(true);
            expect($parse('{standard: 4/3, wide: 16/9}').constant).toBe(true);
          }));

          it('should not mark any expression involving variables or function calls as constant', inject(function($parse) {
            expect($parse('true.toString()').constant).toBe(false);
            expect($parse('foo(1, 2, 3)').constant).toBe(false);
            expect($parse('"name" + id').constant).toBe(false);
          }));
        });

        describe('nulls in expressions', function() {
          // simpleGetterFn1
          it('should return null for `a` where `a` is null', inject(function($rootScope) {
            $rootScope.a = null;
            expect($rootScope.$eval('a')).toBe(null);
          }));

          it('should return undefined for `a` where `a` is undefined', inject(function($rootScope) {
            expect($rootScope.$eval('a')).toBeUndefined();
          }));

          // simpleGetterFn2
          it('should return undefined for properties of `null` constant', inject(function($rootScope) {
            expect($rootScope.$eval('null.a')).toBeUndefined();
          }));

          it('should return undefined for properties of `null` values', inject(function($rootScope) {
            $rootScope.a = null;
            expect($rootScope.$eval('a.b')).toBeUndefined();
          }));

          it('should return null for `a.b` where `b` is null', inject(function($rootScope) {
            $rootScope.a = { b: null };
            expect($rootScope.$eval('a.b')).toBe(null);
          }));

          // cspSafeGetter && pathKeys.length < 6 || pathKeys.length > 2
          it('should return null for `a.b.c.d.e` where `e` is null', inject(function($rootScope) {
            $rootScope.a = { b: { c: { d: { e: null } } } };
            expect($rootScope.$eval('a.b.c.d.e')).toBe(null);
          }));

          it('should return undefined for `a.b.c.d.e` where `d` is null', inject(function($rootScope) {
            $rootScope.a = { b: { c: { d: null } } };
            expect($rootScope.$eval('a.b.c.d.e')).toBeUndefined();
          }));

          // cspSafeGetter || pathKeys.length > 6
          it('should return null for `a.b.c.d.e.f.g` where `g` is null', inject(function($rootScope) {
            $rootScope.a = { b: { c: { d: { e: { f: { g: null } } } } } };
            expect($rootScope.$eval('a.b.c.d.e.f.g')).toBe(null);
          }));

          it('should return undefined for `a.b.c.d.e.f.g` where `f` is null', inject(function($rootScope) {
            $rootScope.a = { b: { c: { d: { e: { f: null } } } } };
            expect($rootScope.$eval('a.b.c.d.e.f.g')).toBeUndefined();
          }));
        });
      });
    });
  });


  describe('promises', function() {

    var deferred, promise, q;

    describe('unwrapPromises setting', function () {

      beforeEach(inject(function($rootScope, $q) {
        scope = $rootScope;

        $rootScope.$apply(function() {
          deferred = $q.defer();
          deferred.resolve('Bobo');
          promise = deferred.promise;
        });
      }));

      it('should not unwrap promises by default', inject(function ($parse) {
        scope.person = promise;
        scope.things = {person: promise};
        scope.getPerson = function () { return promise; };

        var getter = $parse('person');
        var propGetter = $parse('things.person');
        var fnGetter = $parse('getPerson()');

        expect(getter(scope)).toBe(promise);
        expect(propGetter(scope)).toBe(promise);
        expect(fnGetter(scope)).toBe(promise);
      }));
    });


    forEach([true, false], function(cspEnabled) {

      describe('promise logging (csp:' + cspEnabled + ')', function() {

        var $log;
        var PROMISE_WARNING_REGEXP = /\[\$parse\] Promise found in the expression `[^`]+`. Automatic unwrapping of promises in Angular expressions is deprecated\./;
        var originalSecurityPolicy;


        beforeEach(function() {
          originalSecurityPolicy = window.document.securityPolicy;
          window.document.securityPolicy = {isActive : cspEnabled};
        });

        afterEach(function() {
          window.document.securityPolicy = originalSecurityPolicy;
        });

        beforeEach(module(function($parseProvider) {
          $parseProvider.unwrapPromises(true);
        }));

        beforeEach(inject(function($rootScope, $q, _$log_) {
          scope = $rootScope;

          $rootScope.$apply(function() {
            deferred = $q.defer();
            deferred.resolve('Bobo');
            promise = deferred.promise;
          });

          $log = _$log_;
        }));

        it('should log warnings by default', function() {
          scope.person = promise;
          scope.$eval('person');
          expect($log.warn.logs.pop()).toEqual(['[$parse] Promise found in the expression `person`. ' +
              'Automatic unwrapping of promises in Angular expressions is deprecated.']);
        });


        it('should log warnings for deep promises', function() {
          scope.car = {wheel: {disc: promise}};
          scope.$eval('car.wheel.disc.pad');
          expect($log.warn.logs.pop()).toMatch(PROMISE_WARNING_REGEXP);
        });


        it('should log warnings for setters', function() {
          scope.person = promise;
          scope.$eval('person.name = "Bubu"');
          expect($log.warn.logs.pop()).toMatch(PROMISE_WARNING_REGEXP);
        });


        it('should log only a single warning for each expression', function() {
          scope.person1 = promise;
          scope.person2 = promise;

          scope.$eval('person1');
          scope.$eval('person1');
          expect($log.warn.logs.pop()).toMatch(/`person1`/);
          expect($log.warn.logs).toEqual([]);

          scope.$eval('person1');
          scope.$eval('person2');
          scope.$eval('person1');
          scope.$eval('person2');
          expect($log.warn.logs.pop()).toMatch(/`person2`/);
          expect($log.warn.logs).toEqual([]);
        });


        it('should log warning for complex expressions', function() {
          scope.person1 = promise;
          scope.person2 = promise;

          scope.$eval('person1 + person2');
          expect($log.warn.logs.pop()).toMatch(/`person1 \+ person2`/);
          expect($log.warn.logs).toEqual([]);
        });
      });
    });


    forEach([true, false], function(cspEnabled) {

      describe('csp ' + cspEnabled, function() {

        var originalSecurityPolicy;


        beforeEach(function() {
          originalSecurityPolicy = window.document.securityPolicy;
          window.document.securityPolicy = {isActive : cspEnabled};
        });

        afterEach(function() {
          window.document.securityPolicy = originalSecurityPolicy;
        });


        beforeEach(module(function($parseProvider) {
          $parseProvider.unwrapPromises(true);
          $parseProvider.logPromiseWarnings(false);
        }));


        beforeEach(inject(function($rootScope, $q) {
          scope = $rootScope;

          q = $q;
          deferred = q.defer();
          promise = deferred.promise;
        }));


        describe('{{promise}}', function() {
          it('should evaluated resolved promise and get its value', function() {
            deferred.resolve('hello!');
            scope.greeting = promise;
            expect(scope.$eval('greeting')).toBe(undefined);
            scope.$digest();
            expect(scope.$eval('greeting')).toBe('hello!');
          });


          it('should evaluated rejected promise and ignore the rejection reason', function() {
            deferred.reject('sorry');
            scope.greeting = promise;
            expect(scope.$eval('greeting')).toBe(undefined);
            scope.$digest();
            expect(scope.$eval('greeting')).toBe(undefined);
          });


          it('should evaluate a promise and eventualy get its value', function() {
            scope.greeting = promise;
            expect(scope.$eval('greeting')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('greeting')).toBe(undefined);

            deferred.resolve('hello!');
            expect(scope.$eval('greeting')).toBe(undefined);
            scope.$digest();
            expect(scope.$eval('greeting')).toBe('hello!');
          });


          it('should evaluate a promise and eventualy ignore its rejection', function() {
            scope.greeting = promise;
            expect(scope.$eval('greeting')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('greeting')).toBe(undefined);

            deferred.reject('sorry');
            expect(scope.$eval('greeting')).toBe(undefined);
            scope.$digest();
            expect(scope.$eval('greeting')).toBe(undefined);
          });


          describe('assignment into promises', function() {
            // This behavior is analogous to assignments to non-promise values
            // that are lazily set on the scope.
            it('should evaluate a resolved object promise and set its value', inject(function($parse) {
              scope.person = promise;
              deferred.resolve({'name': 'Bill Gates'});

              var getter = $parse('person.name', { unwrapPromises: true });
              expect(getter(scope)).toBe(undefined);

              scope.$digest();
              expect(getter(scope)).toBe('Bill Gates');
              getter.assign(scope, 'Warren Buffet');
              expect(getter(scope)).toBe('Warren Buffet');
            }));


            it('should evaluate a resolved primitive type promise and set its value', inject(function($parse) {
              scope.greeting = promise;
              deferred.resolve('Salut!');

              var getter = $parse('greeting', { unwrapPromises: true });
              expect(getter(scope)).toBe(undefined);

              scope.$digest();
              expect(getter(scope)).toBe('Salut!');

              getter.assign(scope, 'Bonjour');
              expect(getter(scope)).toBe('Bonjour');
            }));


            it('should evaluate an unresolved promise and set and remember its value', inject(function($parse) {
              scope.person = promise;

              var getter = $parse('person.name', { unwrapPromises: true });
              expect(getter(scope)).toBe(undefined);

              scope.$digest();
              expect(getter(scope)).toBe(undefined);

              getter.assign(scope, 'Bonjour');
              scope.$digest();

              expect(getter(scope)).toBe('Bonjour');

              var c1Getter = $parse('person.A.B.C1', { unwrapPromises: true });
              scope.$digest();
              expect(c1Getter(scope)).toBe(undefined);
              c1Getter.assign(scope, 'c1_value');
              scope.$digest();
              expect(c1Getter(scope)).toBe('c1_value');

              // Set another property on the person.A.B
              var c2Getter = $parse('person.A.B.C2', { unwrapPromises: true });
              scope.$digest();
              expect(c2Getter(scope)).toBe(undefined);
              c2Getter.assign(scope, 'c2_value');
              scope.$digest();
              expect(c2Getter(scope)).toBe('c2_value');

              // c1 should be unchanged.
              expect($parse('person.A', { unwrapPromises: true })(scope)).toEqual(
                  {B: {C1: 'c1_value', C2: 'c2_value'}});
            }));


            it('should evaluate a resolved promise and overwrite the previous set value in the absence of the getter',
                inject(function($parse) {
              scope.person = promise;
              var c1Getter = $parse('person.A.B.C1', { unwrapPromises: true });
              c1Getter.assign(scope, 'c1_value');
              // resolving the promise should update the tree.
              deferred.resolve({A: {B: {C1: 'resolved_c1'}}});
              scope.$digest();
              expect(c1Getter(scope)).toEqual('resolved_c1');
            }));
          });
        });

        describe('dereferencing', function() {
          it('should evaluate and dereference properties leading to and from a promise', function() {
            scope.obj = {greeting: promise};
            expect(scope.$eval('obj.greeting')).toBe(undefined);
            expect(scope.$eval('obj.greeting.polite')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('obj.greeting')).toBe(undefined);
            expect(scope.$eval('obj.greeting.polite')).toBe(undefined);

            deferred.resolve({polite: 'Good morning!'});
            scope.$digest();
            expect(scope.$eval('obj.greeting')).toEqual({polite: 'Good morning!'});
            expect(scope.$eval('obj.greeting.polite')).toBe('Good morning!');
          });

          it('should evaluate and dereference properties leading to and from a promise via bracket ' +
              'notation', function() {
            scope.obj = {greeting: promise};
            expect(scope.$eval('obj["greeting"]')).toBe(undefined);
            expect(scope.$eval('obj["greeting"]["polite"]')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('obj["greeting"]')).toBe(undefined);
            expect(scope.$eval('obj["greeting"]["polite"]')).toBe(undefined);

            deferred.resolve({polite: 'Good morning!'});
            scope.$digest();
            expect(scope.$eval('obj["greeting"]')).toEqual({polite: 'Good morning!'});
            expect(scope.$eval('obj["greeting"]["polite"]')).toBe('Good morning!');
          });


          it('should evaluate and dereference array references leading to and from a promise',
              function() {
                scope.greetings = [promise];
                expect(scope.$eval('greetings[0]')).toBe(undefined);
                expect(scope.$eval('greetings[0][0]')).toBe(undefined);

                scope.$digest();
                expect(scope.$eval('greetings[0]')).toBe(undefined);
                expect(scope.$eval('greetings[0][0]')).toBe(undefined);

                deferred.resolve(['Hi!', 'Cau!']);
                scope.$digest();
                expect(scope.$eval('greetings[0]')).toEqual(['Hi!', 'Cau!']);
                expect(scope.$eval('greetings[0][0]')).toBe('Hi!');
              });


          it('should evaluate and dereference promises used as function arguments', function() {
            scope.greet = function(name) { return 'Hi ' + name + '!'; };
            scope.name = promise;
            expect(scope.$eval('greet(name)')).toBe('Hi undefined!');

            scope.$digest();
            expect(scope.$eval('greet(name)')).toBe('Hi undefined!');

            deferred.resolve('Veronica');
            expect(scope.$eval('greet(name)')).toBe('Hi undefined!');

            scope.$digest();
            expect(scope.$eval('greet(name)')).toBe('Hi Veronica!');
          });


          it('should evaluate and dereference promises used as array indexes', function() {
            scope.childIndex = promise;
            scope.kids = ['Adam', 'Veronica', 'Elisa'];
            expect(scope.$eval('kids[childIndex]')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('kids[childIndex]')).toBe(undefined);

            deferred.resolve(1);
            expect(scope.$eval('kids[childIndex]')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('kids[childIndex]')).toBe('Veronica');
          });


          it('should evaluate and dereference promises used as keys in bracket notation', function() {
            scope.childKey = promise;
            scope.kids = {'a': 'Adam', 'v': 'Veronica', 'e': 'Elisa'};

            expect(scope.$eval('kids[childKey]')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('kids[childKey]')).toBe(undefined);

            deferred.resolve('v');
            expect(scope.$eval('kids[childKey]')).toBe(undefined);

            scope.$digest();
            expect(scope.$eval('kids[childKey]')).toBe('Veronica');
          });


          it('should not mess with the promise if it was not directly evaluated', function() {
            scope.obj = {greeting: promise, username: 'hi'};
            var obj = scope.$eval('obj');
            expect(obj.username).toEqual('hi');
            expect(typeof obj.greeting.then).toBe('function');
          });
        });
      });
    });
  });
});
