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DynamicExpressionParserTests.cs
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using NFluent;
using System.Collections.Generic;
using System.Linq.Dynamic.Core.CustomTypeProviders;
using System.Linq.Dynamic.Core.Exceptions;
using System.Linq.Expressions;
using System.Reflection;
using Xunit;
using User = System.Linq.Dynamic.Core.Tests.Helpers.Models.User;
namespace System.Linq.Dynamic.Core.Tests
{
public class DynamicExpressionParserTests
{
private class MyClass
{
public int Foo()
{
return 42;
}
}
private class ComplexParseLambda1Result
{
public int? Age;
public int TotalIncome;
}
[DynamicLinqType]
public class ComplexParseLambda3Result
{
public int? Age { get; set; }
public int TotalIncome { get; set; }
}
public class CustomClassWithStaticMethod
{
public static int GetAge(int x) => x;
}
private class TestCustomTypeProvider : AbstractDynamicLinqCustomTypeProvider, IDynamicLinkCustomTypeProvider
{
private HashSet<Type> _customTypes;
public virtual HashSet<Type> GetCustomTypes()
{
if (_customTypes != null)
{
return _customTypes;
}
_customTypes = new HashSet<Type>(FindTypesMarkedWithDynamicLinqTypeAttribute(new[] { GetType().GetTypeInfo().Assembly }));
_customTypes.Add(typeof(CustomClassWithStaticMethod));
return _customTypes;
}
}
[Fact]
public void ParseLambda_ToList()
{
// Arrange
var testList = User.GenerateSampleModels(51);
var qry = testList.AsQueryable();
// Act
string query = "OrderBy(gg => gg.Income).ToList()";
LambdaExpression expression = DynamicExpressionParser.ParseLambda(qry.GetType(), null, query);
Delegate del = expression.Compile();
IEnumerable<dynamic> result = del.DynamicInvoke(qry) as IEnumerable<dynamic>;
var expected = qry.OrderBy(gg => gg.Income).ToList();
// Assert
Check.That(result).IsNotNull();
Check.That(result).HasSize(expected.Count);
Check.That(result.ToArray()[0]).Equals(expected[0]);
}
[Fact]
public void ParseLambda_Complex_1()
{
// Arrange
var testList = User.GenerateSampleModels(51);
var qry = testList.AsQueryable();
var externals = new Dictionary<string, object>
{
{ "Users", qry }
};
// Act
string query = "Users.GroupBy(x => new { x.Profile.Age }).OrderBy(gg => gg.Key.Age).Select(j => new (j.Key.Age, j.Sum(k => k.Income) As TotalIncome))";
LambdaExpression expression = DynamicExpressionParser.ParseLambda(null, query, externals);
Delegate del = expression.Compile();
IEnumerable<dynamic> result = del.DynamicInvoke() as IEnumerable<dynamic>;
var expected = qry.GroupBy(x => new { x.Profile.Age }).OrderBy(gg => gg.Key.Age).Select(j => new { j.Key.Age, TotalIncome = j.Sum(k => k.Income) }).Select(c => new ComplexParseLambda1Result { Age = c.Age, TotalIncome = c.TotalIncome }).Cast<dynamic>().ToArray();
// Assert
Check.That(result).IsNotNull();
Check.That(result).HasSize(expected.Length);
Check.That(result.ToArray()[0]).Equals(expected[0]);
}
[Fact]
public void ParseLambda_Complex_2()
{
// Arrange
var testList = User.GenerateSampleModels(51);
var qry = testList.AsQueryable();
// Act
string query = "GroupBy(x => new { x.Profile.Age }, it).OrderBy(gg => gg.Key.Age).Select(j => new (j.Key.Age, j.Sum(k => k.Income) As TotalIncome))";
LambdaExpression expression = DynamicExpressionParser.ParseLambda(qry.GetType(), null, query);
Delegate del = expression.Compile();
IEnumerable<dynamic> result = del.DynamicInvoke(qry) as IEnumerable<dynamic>;
var expected = qry.GroupBy(x => new { x.Profile.Age }, x => x).OrderBy(gg => gg.Key.Age).Select(j => new { j.Key.Age, TotalIncome = j.Sum(k => k.Income) }).Select(c => new ComplexParseLambda1Result { Age = c.Age, TotalIncome = c.TotalIncome }).Cast<dynamic>().ToArray();
// Assert
Check.That(result).IsNotNull();
Check.That(result).HasSize(expected.Length);
Check.That(result.ToArray()[0]).Equals(expected[0]);
}
[Fact]
public void ParseLambda_Complex_3()
{
var config = new ParsingConfig
{
CustomTypeProvider = new TestCustomTypeProvider()
};
// Arrange
var testList = User.GenerateSampleModels(51);
var qry = testList.AsQueryable();
var externals = new Dictionary<string, object>
{
{"Users", qry}
};
// Act
string stringExpression = "Users.GroupBy(x => new { x.Profile.Age }).OrderBy(gg => gg.Key.Age).Select(j => new System.Linq.Dynamic.Core.Tests.DynamicExpressionParserTests+ComplexParseLambda3Result{j.Key.Age, j.Sum(k => k.Income) As TotalIncome})";
LambdaExpression expression = DynamicExpressionParser.ParseLambda(config, null, stringExpression, externals);
Delegate del = expression.Compile();
IEnumerable<dynamic> result = del.DynamicInvoke() as IEnumerable<dynamic>;
var expected = qry.GroupBy(x => new { x.Profile.Age }).OrderBy(gg => gg.Key.Age)
.Select(j => new ComplexParseLambda3Result { Age = j.Key.Age, TotalIncome = j.Sum(k => k.Income) })
.Cast<dynamic>().ToArray();
// Assert
Check.That(result).IsNotNull();
Check.That(result).HasSize(expected.Length);
Check.That(result.ToArray()[0]).Equals(expected[0]);
}
[Fact]
public void ParseLambda_Select_1()
{
// Arrange
var testList = User.GenerateSampleModels(51);
var qry = testList.AsQueryable();
var externals = new Dictionary<string, object>
{
{"Users", qry}
};
// Act
string query = "Users.Select(j => new User(j.Income As Income))";
LambdaExpression expression = DynamicExpressionParser.ParseLambda(null, query, externals);
Delegate del = expression.Compile();
object result = del.DynamicInvoke();
// Assert
Assert.NotNull(result);
}
[Fact]
public void ParseLambda_Select_2()
{
// Arrange
var testList = User.GenerateSampleModels(5);
var qry = testList.AsQueryable();
var externals = new Dictionary<string, object>
{
{"Users", qry}
};
// Act
string query = "Users.Select(j => j)";
LambdaExpression expression = DynamicExpressionParser.ParseLambda(null, query, externals);
Delegate del = expression.Compile();
object result = del.DynamicInvoke();
// Assert
Assert.NotNull(result);
}
// https://github.com/StefH/System.Linq.Dynamic.Core/issues/58
[Fact]
public void ParseLambda_4_Issue58()
{
var expressionParams = new[]
{
Expression.Parameter(typeof (MyClass), "myObj")
};
var myClassInstance = new MyClass();
var invokersMerge = new List<object> { myClassInstance };
LambdaExpression expression = DynamicExpressionParser.ParseLambda(false, expressionParams, null, "myObj.Foo()");
Delegate del = expression.Compile();
object result = del.DynamicInvoke(invokersMerge.ToArray());
Check.That(result).Equals(42);
}
[Fact]
public void ParseLambda_DuplicateParameterNames_ThrowsException()
{
// Arrange
var parameters = new[]
{
Expression.Parameter(typeof(int), "x"),
Expression.Parameter(typeof(int), "x")
};
// Act and Assert
Check.ThatCode(() => DynamicExpressionParser.ParseLambda(parameters, typeof(bool), "it == 42"))
.Throws<ParseException>()
.WithMessage("The identifier 'x' was defined more than once");
}
[Fact]
public void ParseLambda_EmptyParameterList()
{
// Arrange
var pEmpty = new ParameterExpression[] { };
// Act
var @delegate = DynamicExpressionParser.ParseLambda(pEmpty, null, "1+2").Compile();
int? result = @delegate.DynamicInvoke() as int?;
// Assert
Check.That(result).Equals(3);
}
[Fact]
public void ParseLambda_ParameterName()
{
// Arrange
var parameters = new[]
{
Expression.Parameter(typeof(int), "x")
};
// Assert
var expressionX = DynamicExpressionParser.ParseLambda(parameters, typeof(bool), "x == 42");
var expressionIT = DynamicExpressionParser.ParseLambda(parameters, typeof(bool), "it == 42");
// Assert
Assert.Equal(typeof(bool), expressionX.Body.Type);
Assert.Equal(typeof(bool), expressionIT.Body.Type);
}
[Fact]
public void ParseLambda_ParameterName_Empty()
{
// Arrange
var parameters = new[]
{
Expression.Parameter(typeof(int), "")
};
// Assert
var expression = DynamicExpressionParser.ParseLambda(parameters, typeof(bool), "it == 42");
// Assert
Assert.Equal(typeof(bool), expression.Body.Type);
}
[Fact]
public void ParseLambda_ParameterName_Null()
{
// Arrange
var parameters = new[]
{
Expression.Parameter(typeof(int), null)
};
// Assert
var expression = DynamicExpressionParser.ParseLambda(parameters, typeof(bool), "it == 42");
// Assert
Assert.Equal(typeof(bool), expression.Body.Type);
}
[Fact]
public void ParseLambda_ParameterExpressionMethodCall_ReturnsIntExpression()
{
var expression = DynamicExpressionParser.ParseLambda(true,
new[] { Expression.Parameter(typeof(int), "x") },
typeof(int),
"x + 1");
Assert.Equal(typeof(int), expression.Body.Type);
}
[Fact]
public void ParseLambda_RealNumbers()
{
var parameters = new ParameterExpression[0];
var result1 = DynamicExpressionParser.ParseLambda(parameters, typeof(double), "0.10");
var result2 = DynamicExpressionParser.ParseLambda(parameters, typeof(double), "0.10d");
var result3 = DynamicExpressionParser.ParseLambda(parameters, typeof(float), "0.10f");
var result4 = DynamicExpressionParser.ParseLambda(parameters, typeof(decimal), "0.10m");
// Assert
Assert.Equal(0.10d, result1.Compile().DynamicInvoke());
Assert.Equal(0.10d, result2.Compile().DynamicInvoke());
Assert.Equal(0.10f, result3.Compile().DynamicInvoke());
Assert.Equal(0.10m, result4.Compile().DynamicInvoke());
}
[Fact]
public void ParseLambda_StringLiteral_ReturnsBooleanLambdaExpression()
{
var expression = DynamicExpressionParser.ParseLambda(new[] { Expression.Parameter(typeof(string), "Property1") }, typeof(Boolean), "Property1 == \"test\"");
Assert.Equal(typeof(Boolean), expression.Body.Type);
}
[Fact]
public void ParseLambda_StringLiteralEmpty_ReturnsBooleanLambdaExpression()
{
var expression = DynamicExpressionParser.ParseLambda(new[] { Expression.Parameter(typeof(string), "Property1") }, typeof(Boolean), "Property1 == \"\"");
Assert.Equal(typeof(Boolean), expression.Body.Type);
}
[Fact]
public void ParseLambda_Config_StringLiteralEmpty_ReturnsBooleanLambdaExpression()
{
var config = new ParsingConfig();
var expression = DynamicExpressionParser.ParseLambda(new[] { Expression.Parameter(typeof(string), "Property1") }, typeof(Boolean), "Property1 == \"\"");
Assert.Equal(typeof(Boolean), expression.Body.Type);
}
[Fact]
public void ParseLambda_StringLiteralEmbeddedQuote_ReturnsBooleanLambdaExpression()
{
string expectedRightValue = "\"test \\\"string\"";
var expression = DynamicExpressionParser.ParseLambda(
new[] { Expression.Parameter(typeof(string), "Property1") },
typeof(Boolean),
string.Format("Property1 == {0}", expectedRightValue));
string rightValue = ((BinaryExpression)expression.Body).Right.ToString();
Assert.Equal(typeof(Boolean), expression.Body.Type);
Assert.Equal(expectedRightValue, rightValue);
}
[Fact]
public void ParseLambda_StringLiteralStartEmbeddedQuote_ReturnsBooleanLambdaExpression()
{
string expectedRightValue = "\"\\\"test\"";
var expression = DynamicExpressionParser.ParseLambda(
new[] { Expression.Parameter(typeof(string), "Property1") },
typeof(Boolean),
string.Format("Property1 == {0}", expectedRightValue));
string rightValue = ((BinaryExpression)expression.Body).Right.ToString();
Assert.Equal(typeof(Boolean), expression.Body.Type);
Assert.Equal(expectedRightValue, rightValue);
}
[Fact]
public void ParseLambda_StringLiteral_MissingClosingQuote()
{
string expectedRightValue = "\"test\\\"";
Assert.Throws<ParseException>(() => DynamicExpressionParser.ParseLambda(
new[] { Expression.Parameter(typeof(string), "Property1") },
typeof(Boolean),
string.Format("Property1 == {0}", expectedRightValue)));
}
[Fact]
public void ParseLambda_StringLiteralEscapedBackslash_ReturnsBooleanLambdaExpression()
{
string expectedRightValue = "\"test\\string\"";
var expression = DynamicExpressionParser.ParseLambda(
new[] { Expression.Parameter(typeof(string), "Property1") },
typeof(Boolean),
string.Format("Property1 == {0}", expectedRightValue));
string rightValue = ((BinaryExpression)expression.Body).Right.ToString();
Assert.Equal(typeof(Boolean), expression.Body.Type);
Assert.Equal(expectedRightValue, rightValue);
}
[Fact]
public void ParseLambda_TupleToStringMethodCall_ReturnsStringLambdaExpression()
{
var expression = DynamicExpressionParser.ParseLambda(
typeof(Tuple<int>),
typeof(string),
"it.ToString()");
Assert.Equal(typeof(string), expression.ReturnType);
}
[Fact]
public void ParseLambda_IllegalMethodCall_ThrowsException()
{
Check.ThatCode(() =>
{
DynamicExpressionParser.ParseLambda(typeof(IO.FileStream), null, "it.Close()");
})
.Throws<ParseException>().WithMessage("Methods on type 'Stream' are not accessible");
}
[Fact]
public void ParseLambda_CustomMethod()
{
// Assign
var config = new ParsingConfig
{
CustomTypeProvider = new TestCustomTypeProvider()
};
var context = new CustomClassWithStaticMethod();
string expression = $"{nameof(CustomClassWithStaticMethod)}.{nameof(CustomClassWithStaticMethod.GetAge)}(10)";
// Act
var lambdaExpression = DynamicExpressionParser.ParseLambda(config, typeof(CustomClassWithStaticMethod), null, expression);
Delegate del = lambdaExpression.Compile();
int result = (int)del.DynamicInvoke(context);
// Assert
Check.That(result).IsEqualTo(10);
}
[Fact]
public void ParseLambda_With_InnerStringLiteral()
{
var originalTrueValue = "simple + \"quoted\"";
var doubleQuotedTrueValue = "simple + \"\"quoted\"\"";
var expressionText = $"iif(1>0, \"{doubleQuotedTrueValue}\", \"false\")";
var lambda = DynamicExpressionParser.ParseLambda(typeof(string), null, expressionText);
var del = lambda.Compile();
object result = del.DynamicInvoke(String.Empty);
Check.That(result).IsEqualTo(originalTrueValue);
}
[Fact]
public void ParseLambda_With_If_Guid_Null()
{
var objContext = new User();
var guidEmpty = Guid.Empty;
var someId = Guid.NewGuid();
var expressionText = $"iif(@0.{nameof(objContext.Id)} == null, @0.{nameof(objContext.Id)} == Guid.Parse(\"{someId}\"), {nameof(objContext.Id)}={nameof(objContext.Id)})";
var lambda = System.Linq.Dynamic.Core.DynamicExpressionParser.ParseLambda(typeof(User), null, expressionText, objContext);
var boolLambda = lambda as Expression<Func<User, bool>>;
Check.That(boolLambda).IsNotEqualTo(null);
var del = lambda.Compile();
object result = del.DynamicInvoke(objContext);
Check.That(result).IsEqualTo(true);
}
[Fact]
public void ParseLambda_With_If_Null_Guid()
{
var objContext = new User();
var guidEmpty = Guid.Empty;
var someId = Guid.NewGuid();
var expressionText = $"iif(null == @0.{nameof(objContext.Id)}, @0.{nameof(objContext.Id)} == Guid.Parse(\"{someId}\"), {nameof(objContext.Id)}={nameof(objContext.Id)})";
var lambda = System.Linq.Dynamic.Core.DynamicExpressionParser.ParseLambda(typeof(User), null, expressionText, objContext);
var boolLambda = lambda as Expression<Func<User, bool>>;
Check.That(boolLambda).IsNotEqualTo(null);
var del = lambda.Compile();
object result = del.DynamicInvoke(objContext);
Check.That(result).IsEqualTo(true);
}
}
}