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LambdaParserTests.cs
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LambdaParserTests.cs
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using System;
using System.Collections.Generic;
using System.Collections;
using System.Diagnostics;
using Xunit;
namespace NReco.Linq.Tests {
public class LambdaParserTests {
Dictionary<string,object> getContext() {
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["getTestObj"] = (Func<TestClass>)(() => new TestClass());
varContext["toString"] = (Func<object,string>)((o) => o.ToString());
varContext["arr1"] = new double[] { 1.5, 2.5 };
varContext["NOT"] = (Func<bool, bool>)((t) => !t);
varContext["Yes"] = true;
varContext["nullVar"] = null;
varContext["name_with_underscore"] = "a_b";
varContext["_name_with_underscore"] = "_a_b";
varContext["day1"] = new DateTime().AddDays(1);
varContext["day2"] = new DateTime().AddDays(2);
varContext["oneDay"] = new TimeSpan(1,0,0,0);
varContext["twoDays"] = new TimeSpan(2,0,0,0);
return varContext;
}
[Fact]
public void Eval() {
var lambdaParser = new LambdaParser();
var varContext = getContext();
Assert.Equal("st", lambdaParser.Eval("test.Substring(2)", varContext ) );
Assert.Equal(true, lambdaParser.Eval("NOT(NOT(1==1))", varContext));
Assert.Equal(3M, lambdaParser.Eval("1+2", varContext) );
Assert.Equal(6M, lambdaParser.Eval("1+2+3", varContext));
Assert.Equal("b{0}_", lambdaParser.Eval("\"b{0}_\"", varContext));
Assert.Equal(3M, lambdaParser.Eval("(1+(3-1)*4)/3", varContext));
Assert.Equal(1M, lambdaParser.Eval("one*5*one-(-1+5*5%10)", varContext));
Assert.Equal("ab", lambdaParser.Eval("\"a\"+\"b\"", varContext));
Assert.Equal(4.14M, lambdaParser.Eval("pi + 1", varContext) );
Assert.Equal(5.14M, lambdaParser.Eval("2 +pi", varContext) );
Assert.Equal(2.14M, lambdaParser.Eval("pi + -one", varContext) );
Assert.Equal("test1", lambdaParser.Eval("test + \"1\"", varContext) );
Assert.Equal("a_b_a_b", lambdaParser.Eval(" name_with_underscore + _name_with_underscore ", varContext));
Assert.Equal(1M, lambdaParser.Eval("true or false ? 1 : 0", varContext) );
Assert.Equal(true, lambdaParser.Eval("5<=3 ? false : true", varContext));
Assert.Equal(5M, lambdaParser.Eval("pi>one && 0<one ? (1+8)/3+1*two : 0", varContext));
Assert.Equal(4M, lambdaParser.Eval("pi>0 ? one+two+one : 0", varContext));
Assert.Equal("lightgreen", lambdaParser.Eval("pi<0 ? \"red\" : (pi<25 ? \"lightgreen\" : \"green\") ", varContext));
Assert.Equal("white", lambdaParser.Eval("pi<1 ? \"red\"\n: (pi<2 ? \"lightgreen\"\n: (pi<3 ? \"green\"\n: \"white\" ) ) ", varContext));
Assert.Equal("white", lambdaParser.Eval("pi<1 ? \"red\"\n: pi<2 ? \"lightgreen\"\n: pi<3 ? \"green\"\n: \"white\" ", varContext));
Assert.Equal(DateTime.Now.Year, lambdaParser.Eval("now.Year", varContext) );
Assert.Equal(true, lambdaParser.Eval(" (1+testObj.IntProp)==2 ? testObj.FldTrue : false ", varContext));
Assert.Equal("ab2_3", lambdaParser.Eval(" \"a\"+testObj.Format(\"b{0}_{1}\", 2, \"3\".ToString() ).ToString() ", varContext));
Assert.Equal(true, lambdaParser.Eval(" testObj.Hash[\"a\"] == \"1\"", varContext));
Assert.Equal(true, lambdaParser.Eval(" (testObj.Hash[\"a\"]-1)==testObj.Hash[\"b\"].Length ", varContext));
Assert.Equal(4.0M, lambdaParser.Eval(" arr1[0]+arr1[1] ", varContext));
Assert.Equal(2M, lambdaParser.Eval(" (new[]{1,2})[1] ", varContext));
Assert.Equal(true, lambdaParser.Eval(" new[]{ one } == new[] { 1 } ", varContext));
Assert.Equal(3, lambdaParser.Eval(" new dictionary{ {\"a\", 1}, {\"b\", 2}, {\"c\", 3} }.Count ", varContext));
Assert.Equal(2M, 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.Equal(2M, ((IDictionary)arr.GetValue(0) )["test"] );
Assert.Equal(1M, ((Array)arr.GetValue(1) ).GetValue(0) );
Assert.Equal("str", lambdaParser.Eval(" testObj.GetDelegNoParam()() ", varContext));
Assert.Equal("zzz", lambdaParser.Eval(" testObj.GetDelegOneParam()(\"zzz\") ", varContext));
Assert.Equal(false, lambdaParser.Eval("(testObj.FldTrue and false) || (testObj.FldTrue && false)", varContext ) );
Assert.Equal(true, lambdaParser.Eval("false or testObj.FldTrue", varContext ) );
Assert.Equal("True", lambdaParser.Eval("testObj.BoolParam(true)", varContext ) );
Assert.Equal("True", lambdaParser.Eval("getTestObj().BoolParam(true)", varContext));
Assert.Equal("NReco.Linq.Tests.LambdaParserTests+TestClass", lambdaParser.Eval("toString(testObj)", varContext));
Assert.True( (bool) lambdaParser.Eval("true && NOT( false )", varContext ) );
Assert.True( (bool) lambdaParser.Eval("true && !( false )", varContext ) );
Assert.False( (bool) lambdaParser.Eval("!Yes", varContext ) );
Assert.True((bool)lambdaParser.Eval("5>two && (5>7 || test.Contains(\"t\") )", varContext));
Assert.True((bool)lambdaParser.Eval("null!=test && test!=null && test.Contains(\"t\") && true == Yes && false==!Yes && false!=Yes", varContext));
Assert.Equal(new DateTime().AddDays(2), lambdaParser.Eval("day1 + oneDay", varContext));
Assert.Equal(new DateTime().AddDays(2), lambdaParser.Eval("oneDay + day1", varContext));
Assert.Equal(new DateTime().AddDays(1), lambdaParser.Eval("day2 - oneDay", varContext));
Assert.Equal(new DateTime().AddDays(1), lambdaParser.Eval("day2 + -oneDay", varContext));
Assert.Equal(new DateTime().AddDays(1), lambdaParser.Eval("-oneDay + day2", varContext));
Assert.Equal(new TimeSpan(1,0,0,0), lambdaParser.Eval("day2 - day1", varContext));
Assert.Equal(new TimeSpan(1,0,0,0).Negate(), lambdaParser.Eval("day1 - day2", varContext));
Assert.Equal(new TimeSpan(1,0,0,0), lambdaParser.Eval("day2 - day1", varContext));
Assert.Equal(new TimeSpan(2,0,0,0), lambdaParser.Eval("oneDay + oneDay", varContext));
Assert.Equal(new TimeSpan(1,0,0,0), lambdaParser.Eval("twoDays - oneDay", varContext));
Assert.Equal(new TimeSpan(1,0,0,0), lambdaParser.Eval("twoDays + -oneDay", varContext));
Assert.Equal(new TimeSpan(1,0,0,0).Negate(), lambdaParser.Eval("oneDay - twoDays", varContext));
Assert.Equal(new TimeSpan(1,0,0,0).Negate(), lambdaParser.Eval("-twoDays + oneDay", varContext));
}
[Fact]
public void OptionsParams() {
//Use new invoker
var lambdaParser = new LambdaParser(OptionsParamsInvokeMethod.Instance);
var varContext = getContext();
Assert.True((bool)lambdaParser.Eval("testObj.OptionalParam(true,true)", varContext));
Assert.False((bool)lambdaParser.Eval("testObj.OptionalParam(true,true,false)", varContext));
Assert.True((bool)lambdaParser.Eval("testObj.OptionalParam2(true,true)", varContext));
Assert.False((bool)lambdaParser.Eval("testObj.OptionalParam2(true,true,true,\"fail\")", varContext));
Assert.True((bool)lambdaParser.Eval("testObj.TestShadowMethod()", varContext));
Assert.True((bool)lambdaParser.Eval("testObj.TestShadowProperty", varContext));
Assert.Equal("Test123ThisIsaTest", (string)lambdaParser.Eval("testObj.ParamMethodTest(\"Test\",123,\"This\",\"Is\",\"a\",\"Test\")", varContext));
Assert.Equal("Today is Saturday, Day 9 of December", lambdaParser.Eval("testObj.Format(\"Today is {0}, Day {1} of {2}\",\"Saturday\",9,\"December\")", varContext));
}
[Fact]
public void SingleEqualSign() {
var varContext = getContext();
var lambdaParser = new LambdaParser();
lambdaParser.AllowSingleEqualSign = true;
Assert.True((bool)lambdaParser.Eval("null = nullVar", varContext));
Assert.True((bool)lambdaParser.Eval("5 = (5+1-1)", varContext));
}
[Fact]
public void VarsInExpression() {
var varContext = getContext();
var lambdaParser = new LambdaParser();
lambdaParser.AllowVars = true;
Assert.Equal("False", lambdaParser.Eval("var a = null == nullVar; (!a).ToString()", varContext));
Assert.Equal(2M, lambdaParser.Eval("var a = two*2; var b = a*2; b/a", varContext));
Assert.True( (bool) lambdaParser.Eval("var a = toString(true); a==\"True\"", varContext));
Assert.Throws<LambdaParserException>( () => {
lambdaParser.Eval("var a = two*2; ", varContext);
});
Assert.Throws<LambdaParserException>(() => {
lambdaParser.Eval("var a; 5", varContext);
});
Assert.Throws<LambdaParserException>(() => {
lambdaParser.Eval("var a=; 5", varContext);
});
}
[Fact]
public void NullComparison() {
var varContext = getContext();
var lambdaParser = new LambdaParser();
Assert.True((bool)lambdaParser.Eval("null == nullVar", varContext));
Assert.True((bool)lambdaParser.Eval("5>nullVar", varContext));
Assert.True((bool)lambdaParser.Eval("testObj!=null", varContext));
Assert.Equal(0, LambdaParser.GetExpressionParameters(lambdaParser.Parse("20 == null")).Length);
lambdaParser = new LambdaParser(new ValueComparer() { NullComparison = ValueComparer.NullComparisonMode.Sql });
Assert.False((bool)lambdaParser.Eval("null == nullVar", varContext));
Assert.False((bool)lambdaParser.Eval("nullVar<5", varContext));
Assert.False((bool)lambdaParser.Eval("nullVar>5", varContext));
}
[Fact]
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.Equal(105M, lambdaParser.Eval("(a*2 + 100)/b", varContext));
}
sw.Stop();
Console.WriteLine("10000 iterations: {0}", sw.Elapsed);
}
public class TestBaseClass
{
public bool TestShadowMethod()
{
return false;
}
public int TestShadowProperty { get { return 0; } }
}
public class TestClass : TestBaseClass {
public int IntProp { get { return 1; } }
public string StrProp { get { return "str"; } }
public bool FldTrue { get { return true; } }
public IDictionary Hash {
get {
return new Hashtable() {
{"a", 1},
{"b", ""}
};
}
}
public string Format(string s, object arg1, int arg2) {
return String.Format(s, arg1, arg2);
}
public string BoolParam(bool flag) {
return flag.ToString();
}
public Func<string, string> GetDelegOneParam() {
return (s) => {
return s;
};
}
public Func<string> GetDelegNoParam() {
return () => {
return StrProp;
};
}
public bool OptionalParam(bool First, bool Second, bool Third = true)
{
return First & Second & Third;
}
public bool OptionalParam2(bool First, bool Second, bool Third = true, string Forth = "pass")
{
return First & Second & Third & Forth == "pass";
}
public new bool TestShadowMethod()
{
return true;
}
public new bool TestShadowProperty { get { return true; } }
public string ParamMethodTest(string First, int Second, params string[] args)
{
return string.Concat(First, Second) + string.Concat(args);
}
public string Format(string format,params object[] args)
{
return String.Format(format, args);
}
}
}
}