public string VisitLambdaPredicateNode(ILambdaPredicateASTNode lambdaPredicate)
{
string firstOperandStr = (lambdaPredicate.FirstOperand as IASTNode).Accept(this);
switch (lambdaPredicate.LOPType)
{
case E_LOGIC_OP_TYPE.LOT_GT:
return(string.Format("({0} {1})", ">", firstOperandStr));
case E_LOGIC_OP_TYPE.LOT_GE:
return(string.Format("({0} {1})", ">=", firstOperandStr));
case E_LOGIC_OP_TYPE.LOT_LT:
return(string.Format("({0} {1})", "<", firstOperandStr));
case E_LOGIC_OP_TYPE.LOT_LE:
return(string.Format("({0} {1})", "<=", firstOperandStr));
case E_LOGIC_OP_TYPE.LOT_EQ:
return(string.Format("({0} {1})", "==", firstOperandStr));
case E_LOGIC_OP_TYPE.LOT_NEQ:
return(string.Format("({0} {1})", "!=", firstOperandStr));
case E_LOGIC_OP_TYPE.LOT_MOD:
return(string.Format("(% {0} == {1})", firstOperandStr, (lambdaPredicate.SecondOperand as IASTNode).Accept(this)));
}
return(string.Empty);
}
public Object VisitLambdaPredicateNode(ILambdaPredicateASTNode lambdaPredicate)
{
if (lambdaPredicate == null)
{
throw new ArgumentNullException("lambdaPredicate", "The argument cannot equal to null");
}
ParameterExpression x = Expression.Parameter(typeof(int), "x");
Expression value = Expression.Constant(lambdaPredicate.FirstOperand.Value[0]);
Expression lambdaBody = Expression.Empty();
switch (lambdaPredicate.LOPType)
{
case E_LOGIC_OP_TYPE.LOT_EQ:
lambdaBody = Expression.Equal(value, x);
break;
case E_LOGIC_OP_TYPE.LOT_NEQ:
lambdaBody = Expression.NotEqual(value, x);
break;
case E_LOGIC_OP_TYPE.LOT_LT:
lambdaBody = Expression.LessThan(x, value);
break;
case E_LOGIC_OP_TYPE.LOT_LE:
lambdaBody = Expression.LessThanOrEqual(x, value);
break;
case E_LOGIC_OP_TYPE.LOT_GT:
lambdaBody = Expression.GreaterThan(x, value);
break;
case E_LOGIC_OP_TYPE.LOT_GE:
lambdaBody = Expression.GreaterThanOrEqual(x, value);
break;
case E_LOGIC_OP_TYPE.LOT_MOD:
if ((mAttributes & E_INTERPRETER_ATTRIBUTES.IA_IS_SAFE_DIVISION_ENABLED) == E_INTERPRETER_ATTRIBUTES.IA_IS_SAFE_DIVISION_ENABLED)
{
lambdaBody = Expression.Equal(_createSafeModuloOperator(x, value), Expression.Constant(lambdaPredicate.SecondOperand.Value[0]));
}
else
{
lambdaBody = Expression.Equal(Expression.Modulo(x, value), Expression.Constant(lambdaPredicate.SecondOperand.Value[0]));
}
break;
}
return(Expression.Lambda(lambdaBody, x).Compile());
}
public CIfThenElseASTNode(IASTNode var, ILambdaPredicateASTNode pred,
IASTNode thenBranch, IASTNode elseBranch) :
base(E_NODE_TYPE.NT_IF_THEN_ELSE)
{
IASTNode predicateNode = pred as IASTNode;
var.Parent = this;
predicateNode.Parent = this;
thenBranch.Parent = this;
elseBranch.Parent = this;
var.NodeId = 0;
predicateNode.NodeId = 1;
thenBranch.NodeId = 2;
elseBranch.NodeId = 3;
mChildren.Add(var);
mChildren.Add(predicateNode);
mChildren.Add(thenBranch);
mChildren.Add(elseBranch);
}
