C# ExpressionContext类代码示例

    /**
     * <summary>Creates a new tokenizer for the specified input
     * stream.</summary>
     *
     * <param name='input'>the input stream to read</param>
     * <param name='expressionContext'>the expression context to work on</param>
     *
     * <exception cref='ParserCreationException'>if the tokenizer
     * couldn't be initialized correctly</exception>
     */
    public ExpressionTokenizer(TextReader input, ExpressionContext expressionContext)
        : base(input, true)
    {

        _expressionContext = expressionContext;
        CreatePatterns();
    }

        public void TestExpressionClone()
        {
            ExpressionContext context = new ExpressionContext();
            context.Variables.Add("a", 100);
            context.Variables.Add("b", 200);
            IGenericExpression<int> exp1 = this.CreateGenericExpression<int>("(a * b)", context);

            IGenericExpression<int> exp2 = exp1.Clone() as IGenericExpression<int>;

            Assert.AreNotSame(exp1.Context.Variables, exp2.Context.Variables);

            exp2.Context.Variables["a"] = 10;
            exp2.Context.Variables["b"] = 20;

            Assert.AreEqual(10 * 20, exp2.Evaluate());

            Thread t1 = new Thread(ThreadRunClone);
            Thread t2 = new Thread(ThreadRunClone);
            t1.Start(exp1);
            t2.Start(exp2);

            IDynamicExpression exp3 = this.CreateDynamicExpression("a * b", context);
            IDynamicExpression exp4 = exp3.Clone() as IDynamicExpression;

            Assert.AreEqual(100 * 200, exp4.Evaluate());
        }

        public void RankedArrayIndexOnOwner()
        {
            var context = new ExpressionContext(null, new Owner());

            Resolve(context, "RankedProperty[0,0]", 1);
            Resolve(context, "RankedProperty[1,1]", 4);
        }

 private static ExpressionContext GetExpressionContext()
 {
     var expressionOwner = new TestData { Id = "World" };
     var context = new ExpressionContext(expressionOwner);
     context.Imports.AddType(typeof(TestDataExtensions));
     return context;
 }

        public void TestBatchLoad()
        {
            // Test that we can add expressions in any order
            CalculationEngine engine = new CalculationEngine();
            ExpressionContext context = new ExpressionContext();

            int interest = 2;
            context.Variables.Add("interest", interest);

            BatchLoader loader = engine.CreateBatchLoader();

            loader.Add("c", "a + b", context);
            loader.Add("a", "100 + interest", context);
            loader.Add("b", "a + 1 + a", context);
            // Test an expression with a reference in a string
            loader.Add("d", "\"str \\\" str\" + a + \"b\"", context);

            engine.BatchLoad(loader);

            int result = engine.GetResult<int>("b");
            Assert.AreEqual((100 + interest) + 1 + (100 + interest), result);

            interest = 300;
            context.Variables["interest"] = interest;
            engine.Recalculate("a");

            result = engine.GetResult<int>("b");
            Assert.AreEqual((100 + interest) + 1 + (100 + interest), result);

            result = engine.GetResult<int>("c");
            Assert.AreEqual((100 + interest) + 1 + (100 + interest) + (100 + interest), result);

            Assert.AreEqual("str \" str400b", engine.GetResult<string>("d"));
        }

		internal ExpressionOptions(ExpressionContext owner)
		{
			MyOwner = owner;
			MyProperties = new PropertyDictionary();

			this.InitializeProperties();
		}

 /// <summary>
 /// Creates a new instance of the <see cref="DynamicCalculator"/>.
 /// </summary>
 public DynamicCalculator()
 {
     m_variableNames = new HashSet<string>();
     m_keyMapping = new Dictionary<MeasurementKey, string>();
     m_nonAliasedTokens = new SortedDictionary<int, string>();
     m_expressionContext = new ExpressionContext();
 }

 private string processGlobal(string expr)
 {
     var val = PluginMain.debugManager.FlashInterface.Session.getGlobal(expr);
     //var val = PluginMain.debugManager.FlashInterface.Session.getValue(Convert.ToInt64(expr));
     var ctx = new ExpressionContext(PluginMain.debugManager.FlashInterface.Session, PluginMain.debugManager.FlashInterface.GetFrames()[PluginMain.debugManager.CurrentFrame]);
     return ctx.FormatValue(val);
 }

        public void TestExpressionVariables()
        {
            ExpressionContext context1 = new ExpressionContext();
            context1.Imports.Add(new Import(typeof(Math)));
            var exp1 = new DynamicExpression("sin(pi)", ExpressionLanguage.Flee);
            var boundExp1 = exp1.Bind(context1);

            ExpressionContext context2 = new ExpressionContext();
            context2.Imports.Add(new Import(typeof(Math)));
            var exp2 = new DynamicExpression<double>("cos(pi/2)", ExpressionLanguage.Flee);
            var boundExp2 = exp2.Bind(context2);

            ExpressionContext context3 = new ExpressionContext();
            context3.Variables.Add("a", boundExp1);
            context3.Variables.Add("b", boundExp2);
            var exp3 = new DynamicExpression("cast(a, double) + b", ExpressionLanguage.Flee);

            double a = Math.Sin(Math.PI);
            double b = Math.Cos(Math.PI / 2);

            Assert.AreEqual(a + b, exp3.Invoke(context3));

            ExpressionContext context4 = new ExpressionContext();
            context4.Variables.Add("a", boundExp1);
            context4.Variables.Add("b", boundExp2);
            var exp4 = new DynamicExpression<double>("(cast(a, double) * b) + (b - cast(a, double))", ExpressionLanguage.Flee);

            Assert.AreEqual((a * b) + (b - a), exp4.Invoke(context4));
        }

        /*
        private void BuildExpression()
        {
            foreach (Assignment assignment in _assignments)
            {
                string stringDelim = "\"";
                if (assignment.Variable.VariableDataType != VariableDataType.String)
                    stringDelim = string.Empty;
                _expression += assignment.Variable.Mnemonic + " = " + stringDelim + assignment.AssignmentExpression + stringDelim + ";";
            }
        }
        */
        private void Parse(ExpressionContext context, CalculationMemory calculationMemory)
        {
            _assignments.Clear();
            // assignments seprator token
            string[] temp = _expression.Split(';');
            int idx = 0;

            //temp.OrderBy?
            foreach (string assignmentExpression in temp)
            {
                if (assignmentExpression != string.Empty)
                {
                    // assignment token
                    string[] temp2 = assignmentExpression.Split('=');
                    if (temp2.Length != 2)
                        throw new InequationEngineException(ExceptionType.NumberOfAssigmentTokens);

                    string variableName = temp2[0].ToLower().Trim();
                    Variable variable = calculationMemory[variableName];
                    if (variable == null)
                        throw new InequationEngineException(ExceptionType.VariableNotFoundInCalcMemory);

                    Assignment assignment = new Assignment(variable, temp2[1]);
                    _assignments.Add(idx, assignment);
                    idx++;
                }
            }
        }

        public void TestFastVariables()
        {
            // Test should take 200ms or less
            const int EXPECTED_TIME = 200;
            const int ITERATIONS = 100000;

            ExpressionContext context = new ExpressionContext();
            VariableCollection vars = context.Variables;
            vars.DefineVariable("a", typeof(Int32));
            vars.DefineVariable("b", typeof(Int32));
            IDynamicExpression e = this.CreateDynamicExpression("a + b * (a ^ 2)", context);

            Stopwatch sw = new Stopwatch();
            sw.Start();

            for (int i = 0; i <= ITERATIONS - 1; i++) {
                object result = e.Evaluate();
                vars["a"] = 200;
                vars["b"] = 300;
            }

            sw.Stop();

            this.PrintSpeedMessage("Fast variables", ITERATIONS, sw);
            NUnit.Framework.Assert.Less((decimal)sw.ElapsedMilliseconds, EXPECTED_TIME, "Test time above expected value");
        }

 internal ElementInit ToElementInit(ExpressionContext context)
 {
     return 
         Expression.ElementInit(
             this.AddMethod.ToMemberInfo(context), 
             (this.Arguments ?? new ExpressionNodeList()).GetExpressions(context));
 }

 public void Compile(ExpressionContext context)
 {
     // TODO: verify wheather the expression is a value (no need to compile)
     bool isValue = false;
     if (!isValue)
         eDynamic = context.CompileDynamic(AssignmentExpression);
 }

		public PMNameNode(ExpressionNode node, string tokenString, ExpressionContext context)
			: base(node, tokenString, context)
		{
			string[] parts = Name.Split('.');

			if (parts.Length == 3)
			{
				isAttribute = true;
				ObjectName = (PMObjectType)Enum.Parse(typeof(PMObjectType), parts[0], true);
				FieldName = parts[2].Trim('[',']').Trim();
			}
			else if (parts.Length == 2)
			{
				ObjectName = (PMObjectType)Enum.Parse(typeof(PMObjectType), parts[0], true);
				if (parts[1].Trim().EndsWith("_Attributes"))
				{
					isAttribute = true;
					FieldName = parts[1].Substring(0, parts[1].Length - 11);
				}
				else
					FieldName = parts[1];
			}
			else
			{
				ObjectName = PMObjectType.PMTran;
				FieldName = Name;
			}
		}

 public InequationEngine()
 {
     _context = new ExpressionContext();
     _context.Imports.AddType(typeof(CustomFunctions));
     _context.Options.EmitToAssembly = false;
     _calculationMemory = new CalculationMemory(_context);
 }