public string VisitUnaryLambdaFuncNode(IUnaryLambdaFuncASTNode unaryLambdaFunc)
{
StringBuilder lambdaStr = new StringBuilder();
lambdaStr.AppendFormat("({0} {1})",
_constructOperationStr(unaryLambdaFunc.OpType),
unaryLambdaFunc.Body.Accept(this));
return(lambdaStr.ToString());
}
public Object VisitUnaryLambdaFuncNode(IUnaryLambdaFuncASTNode unaryLambdaFunc)
{
if (unaryLambdaFunc == null)
{
throw new ArgumentNullException("unaryLambdaFunc", "The argument cannot equal to null");
}
ParameterExpression x = Expression.Parameter(typeof(int), "x");
Expression lambdaBody = Expression.Empty();
Expression y = (Expression)_visitUnaryLambdaFuncHelper(unaryLambdaFunc.Body, x);
lambdaBody = _createExpressionByOpType(unaryLambdaFunc.OpType, x, y);
return(Expression.Lambda(lambdaBody.Reduce(), x).Compile());
}
protected Object _visitUnaryLambdaFuncHelper(IASTNode node, Expression parameter)
{
int[] valueArray = null;
if (node.Type == E_NODE_TYPE.NT_VALUE)
{
valueArray = (node as IValueASTNode).Value;
return(Expression.Constant(valueArray.Length >= 1 ? valueArray[0] : 0));
}
IUnaryLambdaFuncASTNode funcNode = node as IUnaryLambdaFuncASTNode;
if (funcNode == null)
{
throw new CRuntimeError("Invalid lambda's body");
}
IASTNode lambdaBody = funcNode.Body;
Expression value = null;
if (lambdaBody.Type == E_NODE_TYPE.NT_VALUE)
{
valueArray = (lambdaBody as IValueASTNode).Value;
value = Expression.Constant(valueArray.Length >= 1 ? valueArray[0] : 0);
return(_createExpressionByOpType(funcNode.OpType, parameter, value));
}
if (lambdaBody.Type != E_NODE_TYPE.NT_UNARY_LAMBDA_FUNC)
{
throw new CRuntimeError("Invalid lambda's body");
}
value = (Expression)_visitUnaryLambdaFuncHelper(lambdaBody, parameter);
return(_createExpressionByOpType(funcNode.OpType, parameter, value));
}
