public void TestConstants()
{
var parser = FormulaParser.Create();
Assert.AreEqual(Math.PI, parser.Evaluate("pi").Value);
Assert.AreEqual(Math.E, parser.Evaluate("e").Value);
}
public void TestNotConfigured_InvalidVariable()
{
var parser = FormulaParser.Create();
var result = parser.Parse("1 * TEST");
Assert.IsFalse(result.Success);
Assert.AreEqual("column 4: Unknown variable 'TEST'.", (string)result.Error);
}
public void TestNotConfigured_InvalidFunctions()
{
var parser = FormulaParser.Create();
var result = parser.Parse("1 * test()");
Assert.IsFalse(result.Success);
Assert.AreEqual("column 4: Unknown function 'test'.", (string)result.Error);
}
private static void AsserEval(double expectedResult, string formular, IFormulaParser formulaParser, params string[] variables)
{
var variableDict = variables.Select(i => i.Split(':')).ToDictionary(i => i[0], i => double.Parse(i[1]));
var parsers = new IFormulaParser[] { FormulaParser.Create(), FormulaParser.CreateBuilder().Build() };
foreach (var parser in parsers)
{
var result = parser.Evaluate(formular, variableDict);
Assert.IsTrue(result.Success, string.Join("; ", (string)result.Error));
Assert.AreEqual(Math.Round(expectedResult, 5), Math.Round(result.Value, 5));
}
}
private static void AssertFailure(string message, string formular, params string[] variables)
{
var variableDict = variables.Select(i => i.Split(':')).ToDictionary(i => i[0], i => double.Parse(i[1]));
var parsers = new IFormulaParser[] { FormulaParser.Create() };
foreach (var parser in parsers)
{
var parsingResult = parser.Evaluate(formular, variableDict);
Assert.IsFalse(parsingResult.Success, "Error excepted.");
Assert.IsTrue(parsingResult.Error.ToString().StartsWith(message), $"Exptected to start with '{message}' but message was: '{parsingResult.Error}'");
}
}
public void TestRandom()
{
var parser = FormulaParser.Create();
var rnd1 = parser.Evaluate("rnd()").Value;
var rnd2 = parser.Evaluate("rnd()").Value;
Assert.IsTrue(rnd1 != rnd2);
Assert.IsTrue(rnd1 <= 1.0);
Assert.IsTrue(rnd1 >= 0.0);
Assert.IsTrue(rnd2 <= 1.0);
Assert.IsTrue(rnd2 >= 0.0);
}
public void Test_NameOfVariableConflictsWithNameOfConstant()
{
var parser = FormulaParser.Create();
var variables = new Dictionary <string, double>
{
["pi"] = 3.0
};
var result = parser.Evaluate("2 * pi", variables);
Assert.IsFalse(result.Success);
Assert.AreEqual("Variable name 'pi' conflicts with the name of an existing constant.", (string)result.Error);
}
public void Test_ConstantNotExist()
{
var parser = FormulaParser.Create();
var parser2 = FormulaParser.CreateBuilder().ConfigureConstats(c => c.RemoveAll()).Build();
var node = parser.Parse("2 * pi").Value;
parser.Evaluate(node);
Assert.AreEqual(Math.PI * 2, parser.Evaluate(node));
var result = parser2.Evaluate(node);
Assert.IsFalse(result.Success);
Assert.AreEqual("Constant 'pi' does not exist.", (string)result.Error);
}
public void Test_FormulatText()
{
var parser = FormulaParser.Create();
var parser2 = FormulaParser
.CreateBuilder()
.ConfigureFunctions(functions => functions.Add("max", (a, b) => Math.Max(a, b)))
.Build();
parser2.Evaluate("1 + max(2, 4)");
var result = parser.Parse("2 * pi").Value as FormulaNode;
Assert.AreEqual("2 * pi", result.FormulaText);
}
public void TestDefaultConfiguration()
{
var parser = FormulaParser.Create();
Assert.AreEqual(1.0, parser.Evaluate("min(1, 3.4)").Value);
Assert.AreEqual(3.4, parser.Evaluate("max(1, 3.4)").Value);
Assert.AreEqual(100.0, parser.Evaluate("max(100, 2, 3, 4 )").Value);
Assert.AreEqual(15.0, parser.Evaluate("sum(1, 2, 3, 4, 5)").Value);
Assert.AreEqual(2.0, parser.Evaluate("abs(2)").Value);
Assert.AreEqual(2.0, parser.Evaluate("abs(-2)").Value);
Assert.AreEqual(Math.Log(2), parser.Evaluate("ln(2)").Value);
Assert.AreEqual(Math.Log(2, 3), parser.Evaluate("log(2, 3)").Value);
Assert.AreEqual(Math.Log10(4), parser.Evaluate("log(4)").Value);
Assert.AreEqual(Math.Sin(3), parser.Evaluate("sin(3)").Value);
Assert.AreEqual(Math.Cos(3), parser.Evaluate("cos(3)").Value);
Assert.AreEqual(Math.Tan(3), parser.Evaluate("tan(3)").Value);
}
public void TestRunCostumVisitor()
{
var variables = new Dictionary <string, double>
{
["x"] = 2
};
var parser = FormulaParser.Create();
var node = parser.Parse("1 + 2");
var transformedNode1 = parser.RunVisitor(node, new SwitchPlusAndMinus());
var transformedNode2 = parser.RunVisitor("1 + 2", new SwitchPlusAndMinus());
var transformedNode3 = parser.RunVisitor("1 + x", new SwitchPlusAndMinus(), variables);
foreach (var transformedNode in new[] { transformedNode1, transformedNode2, transformedNode3 })
{
var result = parser.Evaluate(transformedNode, variables);
Assert.AreEqual(-1.0, result.Value);
}
}
public void TestSumWithOneArg()
{
var parser = FormulaParser.Create();
Assert.AreEqual(3.0, parser.Evaluate("sum(3)"));
}