public ExpSyntaxTree c; // if c == null then exp = a ? b, 并且这儿 a 只判断是否是nil，专门用于默认值语法的。
protected override List <object> _GetResults(Frame frame)
{
if (c == null)
{
var aa = a.GetResults(frame);
if (aa.Count == 0 || aa[0] == null)
{
return(b.GetResults(frame));
}
else
{
return(aa);
}
}
else
{
var aa = a.GetBool(frame);
return(aa ? b.GetResults(frame) : c.GetResults(frame));
}
}
protected override List <object> _GetResults(Frame frame)
{
object ret = null;
if (op.Match('-'))
{
ret = exp.GetValidNumber(frame);
}
else if (op.Match(TokenType.NOT))
{
ret = !exp.GetBool(frame);
}
else
{
Debug.Assert(false);
}
return(new List <object>()
{
ret
});
}
protected override List <object> _GetResults(Frame frame)
{
object ret = null;
if (op.Match(TokenType.AND))
{
ret = left.GetBool(frame) && right.GetBool(frame);
}
else if (op.Match(TokenType.OR))
{
ret = left.GetBool(frame) || right.GetBool(frame);
}
else
{
if (op.Match('+'))
{
ret = left.GetValidNumber(frame) + right.GetValidNumber(frame);
}
else if (op.Match('-'))
{
ret = left.GetValidNumber(frame) - right.GetValidNumber(frame);
}
else if (op.Match('*'))
{
ret = left.GetValidNumber(frame) * right.GetValidNumber(frame);
}
else if (op.Match('/'))
{
ret = left.GetValidNumber(frame) / right.GetValidNumber(frame);
}
else if (op.Match('%'))
{
ret = left.GetValidNumber(frame) % right.GetValidNumber(frame);
}
else if (op.Match('<'))
{
var l = left.GetOneResult(frame);
var r = right.GetOneResult(frame);
ret = Utils.Compare(l, r) < 0;
}
else if (op.Match('>'))
{
var l = left.GetOneResult(frame);
var r = right.GetOneResult(frame);
ret = Utils.Compare(l, r) > 0;
}
else if (op.Match(TokenType.LE))
{
var l = left.GetOneResult(frame);
var r = right.GetOneResult(frame);
ret = Utils.Compare(l, r) <= 0;
}
else if (op.Match(TokenType.GE))
{
var l = left.GetOneResult(frame);
var r = right.GetOneResult(frame);
ret = Utils.Compare(l, r) >= 0;
}
else if (op.Match(TokenType.EQ))
{
var l = left.GetOneResult(frame);
var r = right.GetOneResult(frame);
ret = Utils.CheckEquals(l, r);
}
else if (op.Match(TokenType.NE))
{
var l = left.GetOneResult(frame);
var r = right.GetOneResult(frame);
ret = !Utils.CheckEquals(l, r);
}
else if (op.Match(TokenType.CONCAT))
{
ret = left.GetString(frame) + right.GetString(frame);
}
else
{
Debug.Assert(false);
}
}
return(new List <object>()
{
ret
});
}