private static Func <object, object, object> CreateFunc(string program)
{
var assemblyName = new AssemblyName(Guid.NewGuid().ToString())
{
Version = new Version(1, 0)
};
AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName,
AssemblyBuilderAccess.Run);
ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("Program");
ParameterExpression valueParameter = Expression.Parameter(typeof(object), "value");
ParameterExpression parameterParameter = Expression.Parameter(typeof(object), "parameter");
AstHelper astHelper = AstHelper.Default(moduleBuilder);
astHelper.Variables.Add("value", valueParameter);
astHelper.Variables.Add("parameter", parameterParameter);
Expression rootExpression = ProgramExpression.Compile(astHelper, program);
Expression <Func <object, object, object> > lambda =
Expression.Lambda <Func <object, object, object> >(Expression.Convert(rootExpression, typeof(object)),
valueParameter, parameterParameter);
return(lambda.Compile());
}
public void Comparisons(string program, bool result)
{
Expression expression = ProgramExpression.Compile(new AstHelper(null), program);
bool lamda = Expression.Lambda <Func <bool> >(expression).Compile()();
Assert.AreEqual(result, lamda);
}
public void BinaryExpresionOperation(string program, ExpressionType operation)
{
TigerParser parser = Mother.CreateParser(program);
ProgramExpression rootAstExpression = parser.parse();
Expression expression = rootAstExpression.Compile();
Assert.IsInstanceOf <BinaryExpression>(expression);
var binary = expression as BinaryExpression;
Assert.AreEqual(binary.NodeType, operation);
}
public static Expression Compile(string program)
{
var assemblyName = new AssemblyName(Guid.NewGuid().ToString())
{
Version = new Version(1, 0)
};
AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName,
AssemblyBuilderAccess.Run);
ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("Program");
AstHelper runtime = CreateRuntime(moduleBuilder);
return(ProgramExpression.Compile(runtime, program));
}
public void FunctionInvoked_ComplexFunctions(string program, int result)
{
var scope = new AstHelper(null);
Expression <Func <int, int, int> > sum = (a, b) => a + b;
scope.Functions.Add("sum", new FunctionReference(sum, typeof(int), typeof(int), typeof(int)));
Expression <Func <int, int, int> > resta = (a, b) => a - b;
scope.Functions.Add("resta", new FunctionReference(resta, typeof(int), typeof(int), typeof(int)));
Expression <Func <int, int, int> > prod = (a, b) => a * b;
scope.Functions.Add("prod", new FunctionReference(prod, typeof(int), typeof(int), typeof(int)));
Expression <Func <int, int, int> > div = (a, b) => a / b;
scope.Functions.Add("div", new FunctionReference(div, typeof(int), typeof(int), typeof(int)));
Expression expression = ProgramExpression.Compile(scope, program);
int lamda = Expression.Lambda <Func <int> >(expression).Compile()();
Assert.AreEqual(lamda, result);
}