public void CustomFunction()
{
var functions = new string[]
{
"f(x) = x",
"g(x) = f(x + 2)"
};
CompileResult result = InvariantCompiler.Compile(functions);
result.IsSuccess.Should().BeTrue();
result.Functions.Count.Should().Be(2);
result.Functions[0].Should().NotBeNull();
Func <double, double> g = result.Functions[1];
g.Should().NotBeNull();
g(0).Should().Be(2);
g(-2).Should().Be(0);
g(2).Should().Be(4);
result.Functions[1](2).Should().Be(result.Functions[0](4));
}
public void CircularReference_ParseErrors()
{
CompileResult result = InvariantCompiler.Compile("f = x + f(x)");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle(e => e.Type == ErrorType.CyclicFunctions);
}
public void FunctionName_InvalidChars()
{
CompileResult result = InvariantCompiler.Compile("a!= x");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle(e => e.Type == ErrorType.InvalidFunctionName);
}
public void EmptyFunctionCallWithNegation_ParseErrors()
{
CompileResult result = InvariantCompiler.Compile("tan(-)");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle(e => e.Type == ErrorType.InvalidTerm);
}
public void UnknownIdentifier()
{
CompileResult result = InvariantCompiler.Compile("a");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle();
CompileError error = result.Errors.Single();
error.Position.Should().Be(0);
error.Type.Should().Be(ErrorType.UnknownIdentifier);
}
public void MultipleDecimals()
{
CompileResult result = InvariantCompiler.Compile("5.7.11");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle();
CompileError error = result.Errors.Single();
error.Position.Should().Be(3);
error.Type.Should().Be(ErrorType.InvalidNumber);
}
public void SingleDecimal()
{
CompileResult result = InvariantCompiler.Compile(".");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle();
CompileError error = result.Errors.Single();
error.Position.Should().Be(0);
error.Type.Should().Be(ErrorType.InvalidTerm);
}
public void EndsWithDecimal()
{
CompileResult result = InvariantCompiler.Compile("14.");
result.IsSuccess.Should().BeFalse();
result.Errors.Should().ContainSingle();
CompileError error = result.Errors.Single();
error.Position.Should().Be(2);
error.Type.Should().Be(ErrorType.InvalidNumber);
}
public void GetDependentFunctions_SimpleGraph()
{
var functions = new string[]
{
"f(x) = x",
"g(x) = f(x) + f(x) + 2",
"h(x) = g(x) / 2"
};
CompileResult result = InvariantCompiler.Compile(functions);
result.IsSuccess.Should().BeTrue();
string[] dependents = result.GetDependentFunctions("f").ToArray();
dependents.Should().Contain(new string[] { "f", "g", "h" });
}
public void FractionalExponent_Unsupported(string value)
{
CompileResult result = InvariantCompiler.Compile(value);
result.IsSuccess.Should().BeFalse();
}