public static LambdaParser.CompiledExpression CompileExpression(this NReco.Linq.LambdaParser parser, string stringExpression)
{
var expression = parser.Parse(stringExpression);
var compiledExpr = new LambdaParser.CompiledExpression()
{
Parameters = LambdaParser.GetExpressionParameters(expression)
};
var lambdaExpr = Expression.Lambda(expression, compiledExpr.Parameters);
compiledExpr.Lambda = lambdaExpr.Compile();
return(compiledExpr);
}
public void EvalCachePerf() {
var lambdaParser = new LambdaParser();
var varContext = new Dictionary<string, object>();
varContext["a"] = 55;
varContext["b"] = 2;
var sw = new Stopwatch();
sw.Start();
for (int i = 0; i < 10000; i++) {
Assert.AreEqual(105, lambdaParser.Eval("(a*2 + 100)/b", varContext));
}
sw.Stop();
Console.WriteLine("10000 iterations: {0}", sw.Elapsed);
}
public void Eval() {
var lambdaParser = new LambdaParser();
var varContext = new Dictionary<string,object>();
varContext["pi"] = 3.14M;
varContext["one"] = 1M;
varContext["two"] = 2M;
varContext["test"] = "test";
varContext["now"] = DateTime.Now;
varContext["testObj"] = new TestClass();
varContext["arr1"] = new double[] { 1.5, 2.5 };
varContext["NOT"] = (Func<bool,bool>)( (t) => !t );
varContext["Yes"] = true;
varContext["nullVar"] = null;
Assert.AreEqual("st", lambdaParser.Eval("test.Substring(2)", varContext ) );
Assert.AreEqual(3, lambdaParser.Eval("1+2", varContext) );
Assert.AreEqual(6, lambdaParser.Eval("1+2+3", varContext));
Assert.AreEqual("b{0}_", lambdaParser.Eval("\"b{0}_\"", varContext));
Assert.AreEqual(3, lambdaParser.Eval("(1+(3-1)*4)/3", varContext));
Assert.AreEqual(1, lambdaParser.Eval("one*5*one-(-1+5*5%10)", varContext));
Assert.AreEqual("ab", lambdaParser.Eval("\"a\"+\"b\"", varContext));
Assert.AreEqual(4.14, lambdaParser.Eval("pi + 1", varContext) );
Assert.AreEqual(5.14, lambdaParser.Eval("2 +pi", varContext) );
Assert.AreEqual(2.14, lambdaParser.Eval("pi + -one", varContext) );
Assert.AreEqual("test1", lambdaParser.Eval("test + \"1\"", varContext) );
Assert.AreEqual(1, lambdaParser.Eval("true or false ? 1 : 0", varContext) );
Assert.AreEqual(true, lambdaParser.Eval("5<=3 ? false : true", varContext));
Assert.AreEqual(5, lambdaParser.Eval("pi>one && 0<one ? (1+8)/3+1*two : 0", varContext));
Assert.AreEqual(4, lambdaParser.Eval("pi>0 ? one+two+one : 0", varContext));
Assert.AreEqual(DateTime.Now.Year, lambdaParser.Eval("now.Year", varContext) );
Assert.AreEqual(true, lambdaParser.Eval(" (1+testObj.IntProp)==2 ? testObj.FldTrue : false ", varContext));
Assert.AreEqual("ab2_3", lambdaParser.Eval(" \"a\"+testObj.Format(\"b{0}_{1}\", 2, \"3\".ToString() ).ToString() ", varContext));
Assert.AreEqual(true, lambdaParser.Eval(" testObj.Hash[\"a\"] == \"1\"", varContext));
Assert.AreEqual(true, lambdaParser.Eval(" (testObj.Hash[\"a\"]-1)==testObj.Hash[\"b\"].Length ", varContext));
Assert.AreEqual(4.0, lambdaParser.Eval(" arr1[0]+arr1[1] ", varContext));
Assert.AreEqual(2, lambdaParser.Eval(" (new[]{1,2})[1] ", varContext));
Assert.AreEqual(true, lambdaParser.Eval(" new[]{ one } == new[] { 1 } ", varContext));
Assert.AreEqual(3, lambdaParser.Eval(" new dictionary{ {\"a\", 1}, {\"b\", 2}, {\"c\", 3} }.Count ", varContext));
Assert.AreEqual(2, lambdaParser.Eval(" new dictionary{ {\"a\", 1}, {\"b\", 2}, {\"c\", 3} }[\"b\"] ", varContext));
var arr = ((Array)lambdaParser.Eval(" new []{ new dictionary{{\"test\",2}}, new[] { one } }", varContext) );
Assert.AreEqual(2, ((IDictionary)arr.GetValue(0) )["test"] );
Assert.AreEqual(1, ((Array)arr.GetValue(1) ).GetValue(0) );
Assert.AreEqual("str", lambdaParser.Eval(" testObj.GetDelegNoParam()() ", varContext));
Assert.AreEqual("zzz", lambdaParser.Eval(" testObj.GetDelegOneParam()(\"zzz\") ", varContext));
Assert.AreEqual(false, lambdaParser.Eval("(testObj.FldTrue and false) || (testObj.FldTrue && false)", varContext ) );
Assert.AreEqual(true, lambdaParser.Eval("false or testObj.FldTrue", varContext ) );
Assert.AreEqual("True", lambdaParser.Eval("testObj.BoolParam(true)", varContext ) );
Assert.IsTrue( (bool) lambdaParser.Eval("true && NOT( false )", varContext ) );
Assert.IsTrue( (bool) lambdaParser.Eval("true && !( false )", varContext ) );
Assert.IsFalse( (bool) lambdaParser.Eval("!Yes", varContext ) );
Assert.IsTrue( (bool) lambdaParser.Eval("null == nullVar", varContext ) );
Assert.IsTrue( (bool) lambdaParser.Eval("testObj!=null", varContext ) );
Assert.AreEqual(0, LambdaParser.GetExpressionParameters(lambdaParser.Parse("20 == null")).Length );
}
