/// <summary>
/// Rule: AndExpr -> NotExpr (AND NotExpr )* ;
/// </summary>
protected override object EvalAndExpr(ParseTree tree, params object[] paramlist)
{
if (GetNode(TokenType.AND) == null)
{
return((ExpressionBase)GetNode(TokenType.NotExpr).Eval(tree));
}
var expressions = new Stack <ExpressionBase>(nodes.OfTokenType(TokenType.NotExpr).Select(n => n.Eval(tree)).Cast <ExpressionBase>().Reverse());
while (expressions.Count > 1)
{
var leftExpr = expressions.Pop();
var rightExpr = expressions.Pop();
var newExpr = new AndOrExpr
{
First = leftExpr,
Second = rightExpr,
Node = this,
Type = AndOrOperation.And
};
expressions.Push(newExpr);
}
return(expressions.First());
}
public dynamic Visit(AndOrExpr expr)
{
var node = Visit((ExpressionBase)expr);
node.Text = expr.Type.ToString();
return(node);
}
public dynamic Visit(AndOrExpr expr)
{
Visit((ExpressionBase)expr);
if (OptimizeMode.ExpressionSimplify)
{
var left = expr.First as LiteralExpr;
var right = expr.Second as LiteralExpr;
if (left != null && right != null)
{
var literal = new LiteralExpr {
Namespace = expr.Namespace, Node = expr.Node, SymbolType = expr.GetExprType()
};
bool result;
switch (expr.Type)
{
case AndOrOperation.Or:
result = left.Value || right.Value;
break;
case AndOrOperation.And:
result = left.Value && right.Value;
break;
default:
throw new ArgumentOutOfRangeException();
}
literal.Value = result;
return(literal);
}
}
return(expr);
}
public dynamic Visit(AndOrExpr expr)
{
if (expr.FirstType != SymbolType.Bool || expr.SecondType != SymbolType.Bool)
{
throw new ParseException("Логические операции можно производить только над типом Bool", expr.Node);
}
return(SymbolType.Bool);
}
public dynamic Visit(AndOrExpr expr)
{
var left = _codeGen.Local(Visit((dynamic)expr.First)) as Operand;
var right = _codeGen.Local(Visit((dynamic)expr.Second)) as Operand;
switch (expr.Type)
{
case AndOrOperation.Or:
return(left || right);
case AndOrOperation.And:
return(left && right);
default:
throw new ArgumentOutOfRangeException();
}
}
public dynamic Visit(AndOrExpr expr)
{
Visit((ExpressionBase)expr);
return(null);
}