public dynamic Visit(IfStm stm)
{
var node = new TreeNode("IfStatement")
{
Tag = stm.Node
};
node.Nodes.Add(new TreeNode("Condition")
{
Nodes = { Visit((dynamic)stm.Condition) }
});
if (stm.IfTrue != null)
{
node.Nodes.Add(new TreeNode("IfTrueStatements")
{
Nodes = { Visit(stm.IfTrue) }
});
}
if (stm.IfFalse != null)
{
node.Nodes.Add(new TreeNode("IfFalseStatements")
{
Nodes = { Visit(stm.IfFalse) }
});
}
return(node);
}
public dynamic Visit(IfStm stm)
{
stm.OrderNumber = _count;
Visit((dynamic)stm.Condition);
VisitNext(stm);
return(null);
}
/// <summary>
/// Rule: IfStm -> IF Expr Statements (ELSE Statements )? ;
/// </summary>
protected override object EvalIfStm(ParseTree tree, params object[] paramlist)
{
var expr = (ExpressionBase)GetNode(TokenType.Expr).Eval(tree);
var iftrue = (CodeBlock)nodes.OfTokenType(TokenType.Statements).First().Eval(tree);
var iffalse = nodes.OfTokenType(TokenType.Statements).Count() > 1 ? (CodeBlock)nodes.OfTokenType(TokenType.Statements).Last().Eval(tree):null;
var ifstm = new IfStm
{
Node = this,
Condition = expr,
IfFalse = iffalse,
IfTrue = iftrue
};
return(ifstm);
}
public dynamic Visit(IfStm stm)
{
_codeGen.If(Visit((dynamic)stm.Condition));
{
Visit((dynamic)stm.IfTrue);
}
if (stm.IfFalse != null)
{
_codeGen.Else();
{
Visit((dynamic)stm.IfFalse);
}
}
_codeGen.End();
return(null);
}
public dynamic Visit(IfStm stm)
{
stm.Condition = (ExpressionBase)stm.Condition.Optimize();
stm.IfTrue = (CodeBlock)stm.IfTrue.Optimize() ?? stm.IfTrue;
stm.IfFalse = (CodeBlock)(stm.IfFalse?.Optimize() ?? stm.IfFalse);
if (!OptimizeMode.UnreacheableCode)
{
return(stm);
}
var condition = stm.Condition as LiteralExpr;
if (condition == null)
{
return(stm);
}
return(condition.Value ? stm.IfTrue : stm.IfFalse);
}
