Spring.net 表达式解析ExpressionEvaluator

1.类定义
public class Company
    {
        private string name;
        private Employee managingDirector;
        public string Name
        {
            get { return this.name; }
            set { this.name = value; }
        }

        public Employee ManagingDirector
        {
            get { return this.managingDirector; }
            set { this.managingDirector = value; }
        }
    }
    public class Employee
    {
        private string name;
        private float salary;

        public string Name
        {
            get { return this.name; }
            set { this.name = value; }
        }
        public float Salary
        {
            get { return salary; }
            set { this.salary = value; }
        }
    }
    public class Inventor
    {
        public Inventor(string name, DateTime t, string city)
        {
            Name = name;
            date = t;
            PlaceOfBirth = new PlaceOfBirth() {City=city};
            
        }
        public DateTime date;
        public string Name { get; set; }
        public PlaceOfBirth PlaceOfBirth { get; set; }

    }
2.代码实现
            Inventor tesla = new Inventor("Nikola Tesla", new DateTime(1856, 7, 9), "Serbian");
            tesla.PlaceOfBirth.City = "Smiljan";
            string evaluatedName = (string)ExpressionEvaluator.GetValue(tesla, "Name");
            string evaluatedCity = (string)ExpressionEvaluator.GetValue(tesla, "PlaceOfBirth.City");
            ExpressionEvaluator.SetValue(tesla, "PlaceOfBirth.City", "Novi Sad");
   IExpression exp = Expression.Parse("Name");
            string evaluatedName1 = (string)exp.GetValue(tesla, null);
2.1 Literal expressions
    string helloWorld = (string)ExpressionEvaluator.GetValue(null, "'Hello World'"); // evals to "Hello World"
// string tonyPizza = (string)ExpressionEvaluator.GetValue(null, "'Tony\'s Pizza'"); // evals to "Tony's

double avogadrosNumber = (double)ExpressionEvaluator.GetValue(null, "6.0221415E+23");
int maxValue = (int)ExpressionEvaluator.GetValue(null, "0x7FFFFFFF"); // evals to 2147483647
DateTime birthday = (DateTime)ExpressionEvaluator.GetValue(null, "date('1974/08/24')");
DateTime exactBirthday =
(DateTime)ExpressionEvaluator.GetValue(null, " date('19740824T131030', 'yyyyMMddTHHmmss')");
bool trueValue = (bool)ExpressionEvaluator.GetValue(null, "true"); object nullValue = ExpressionEvaluator.GetValue(null, "null");
2.2 Properties, Arrays, Lists, Dictionaries, Indexers
int year = (int) ExpressionEvaluator.GetValue(tesla, "DOB.Year")); // 1856 string city = (string) ExpressionEvaluator.GetValue(pupin, "PlaCeOfBirTh.CiTy"); // "Idvor"
// Inventions Array 
string invention = (string) ExpressionEvaluator.GetValue(tesla, "Inventions[3]"); // "Induction motor" // Members List string name = (string) ExpressionEvaluator.GetValue(ieee, "Members[0].Name"); // "Nikola Tesla" // List and Array navigation string invention = (string) ExpressionEvaluator.GetValue(ieee, "Members[0].Inventions[6]") // "Wireless
// Officer's Dictionary 
Inventor pupin = (Inventor) ExpressionEvaluator.GetValue(ieee, "Officers['president']"; string city = (string) ExpressionEvaluator.GetValue(ieee, "Officers['president'].PlaceOfBirth.City"); // "Idvor" ExpressionEvaluator.SetValue(ieee, "Officers['advisors'][0].PlaceOfBirth.Country", "Croatia");
//index 索引器
public class Bar
{
 private int[] numbers = new int[] {1, 2, 3};
 public int this[int index] 
 {
  get
  {
    return numbers[index];
  }
  set
  {
   numbers[index] = value; 
 }
  }
 Bar b = new Bar(); int val = (int) ExpressionEvaluator.GetValue(bar, "[1]") // evaluated to 2 ExpressionEvaluator.SetValue(bar, "[1]", 3); // set value to 3
2.3 Methods

//string literal
 char[] chars = (char[]) ExpressionEvaluator.GetValue(null, "'test'.ToCharArray(1, 2)")) // 't','e'

//date literal 
int year = (int) ExpressionEvaluator.GetValue(null, "date('1974/08/24').AddYears(31).Year") // 2005
// object usage, calculate age of tesla navigating from the IEEE society. 
  ExpressionEvaluator.GetValue(ieee, "Members[0].GetAge(date('2005-01-01')") // 149 (eww..a big anniversary is
2.4 操作
ExpressionEvaluator.GetValue(null, "2 == 2") // true 
ExpressionEvaluator.GetValue(null, "date('1974-08-24') != DateTime.Today") // true
ExpressionEvaluator.GetValue(null, "2 < -5.0") // false 
ExpressionEvaluator.GetValue(null, "DateTime.Today <= date('1974-08-24')") // false
ExpressionEvaluator.GetValue(null, "'Test' >= 'test'") // true
FooColor fColor = new FooColor(); ExpressionEvaluator.SetValue(fColor, "Color", KnownColor.Blue); bool trueValue = (bool) ExpressionEvaluator.GetValue(fColor, "Color == KnownColor.Blue"); //true
2.5表达式
ExpressionEvaluator.GetValue(null, "3 in {1, 2, 3, 4, 5}") // true
ExpressionEvaluator.GetValue(null, "'Abc' like '[A-Z]b*'") // true
ExpressionEvaluator.GetValue(null, "'Abc' like '?'") // false
ExpressionEvaluator.GetValue(null, "1 between {1, 5}") // true
ExpressionEvaluator.GetValue(null, "'efg' between {'abc', 'xyz'}") // true
ExpressionEvaluator.GetValue(null, "'xyz' is int") // false
ExpressionEvaluator.GetValue(null, "{1, 2, 3, 4, 5} is IList") // true
ExpressionEvaluator.GetValue(null, "'5.0067' matches '^-?\d+(\.\d{2})?$'")) // false
ExpressionEvaluator.GetValue(null, @"'5.00' matches '^-?d+(.d{2})?$'") // true
2.6 Logical operators
bool falseValue = (bool) ExpressionEvaluator.GetValue(null, "true and false"); //false 
string expression = @"IsMember('Nikola Tesla') and IsMember('Mihajlo Pupin')"; 
bool trueValue = (bool) ExpressionEvaluator.GetValue(ieee, expression); //true 
bool trueValue = (bool) ExpressionEvaluator.GetValue(null, "true or false"); //true 
string expression = @"IsMember('Nikola Tesla') or IsMember('Albert Einstien')"; 
bool trueValue = (bool) ExpressionEvaluator.GetValue(ieee, expression); // true 
// NOT
 bool falseValue = (bool) ExpressionEvaluator.GetValue(null, "!true"); 
// AND and NOT 
string expression = @"IsMember('Nikola Tesla') and !IsMember('Mihajlo Pupin')"; 
bool falseValue = (bool) ExpressionEvaluator.GetValue(ieee, expression);
2.7 位运算
// AND 
int result = (int) ExpressionEvaluator.GetValue(null, "1 and 3"); // 1 & 3 
// OR int result = (int) ExpressionEvaluator.GetValue(null, "1 or 3"); // 1 | 3 
// XOR int result = (int) ExpressionEvaluator.GetValue(null, "1 xor 3"); // 1 ^ 3 
// NOT int result = (int) ExpressionEvaluator.GetValue(null, "!1"); // ~1
2.8 数学运算
// Addition 
int two = (int)ExpressionEvaluator.GetValue(null, "1 + 1"); // 2 
String testString = (String)ExpressionEvaluator.GetValue(null, "'test' + ' ' + 'string'"); //'test string'
DateTime dt = (DateTime)ExpressionEvaluator.GetValue(null, "date('1974-08-24') + 5"); // 8/29/1974 
// Subtraction int four = (int) ExpressionEvaluator.GetValue(null, "1 - -3"); //4
 Decimal dec = (Decimal) ExpressionEvaluator.GetValue(null, "1000.00m - 1e4"); // 9000.00 
TimeSpan ts = (TimeSpan) ExpressionEvaluator.GetValue(null, "date('2004-08-14') - date('1974-08-24')"); //10948.00:00:00 //
int six = (int) ExpressionEvaluator.GetValue(null, "-2 * -3"); // 6 
int twentyFour = (int) ExpressionEvaluator.GetValue(null, "2.0 * 3e0 * 4"); // 24 
// Division int minusTwo = (int) ExpressionEvaluator.GetValue(null, "6 / -3"); // -2 
int one = (int) ExpressionEvaluator.GetValue(null, "8.0 / 4e0 / 2"); // 1 
// Modulus int three = (int) ExpressionEvaluator.GetValue(null, "7 % 4"); // 3 
int one = (int) ExpressionEvaluator.GetValue(null, "8.0 % 5e0 % 2"); // 1
int sixteen = (int) ExpressionEvaluator.GetValue(null, "-2 ^ 4"); // 16 
// Operator precedence
 int minusFortyFive = (int) ExpressionEvaluator.GetValue(null, "1+2-3*8^2/2/2"); // -45
2.9 Assignment
Inventor inventor = new Inventor(); 
String aleks = (String) ExpressionEvaluator.GetValue(inventor, "Name = 'Aleksandar Seovic'");
DateTime dt = (DateTime) ExpressionEvaluator.GetValue(inventor, "DOB = date('1974-08-24')"); 
//Set the vice president of the society
Inventor tesla = (Inventor) ExpressionEvaluator.GetValue(ieee, "Officers['vp'] = Members[0]");
3.0 表达式列表
//Perform property assignments and then return Name property. 
String pupin = (String) ExpressionEvaluator.GetValue(ieee.Members, "( [1].PlaceOfBirth.City = 'Beograd'; [1].PlaceOfBirth.Country = 'Serbia'; [1].Name )")); // pupin = "Mihajlo Pupin"
3.1 类型
ExpressionEvaluator.GetValue(null, "1 is int") 
ExpressionEvaluator.GetValue(null, "DateTime.Today")
ExpressionEvaluator.GetValue(null, "new string[] {'abc', 'efg'}")
Type dateType = (Type) ExpressionEvaluator.GetValue(null, "T(System.DateTime)") 
Type evalType = (Type) ExpressionEvaluator.GetValue(null, "T(Spring.Expressions.ExpressionEvaluator, Spring.Core)") 
bool trueValue = (bool) ExpressionEvaluator.GetValue(tesla, "T(System.DateTime) == DOB.GetType()")
3.2 类型注册
TypeRegistry.RegisterType("Society", typeof(Society)); 
Inventor pupin = (Inventor) ExpressionEvaluator.GetValue(ieee, "Officers[Society.President]");
3.3 Variables
IDictionary vars = new Hashtable(); 
vars["newName"] = "Mike Tesla"; 
ExpressionEvaluator.GetValue(tesla, "Name = #newName", vars));
ExpressionEvaluator.GetValue(tesla, "{ #oldName = Name; Name = 'Nikola Tesla' }", vars); 
String oldName = (String)vars["oldName"]; // Mike Tesla
vars["prez"] = "president"; 
Inventor pupin = (Inventor) ExpressionEvaluator.GetValue(ieee, "Officers[#prez]", vars);