/// <summary>
/// 处理逻辑否
/// </summary>
/// <returns></returns>
private Expression ParseLogicNot()
{
var position = Tokens.Current.Position;
Tokens.MoveToNext();
var content = GeneralParser(TokenType.String, TokenType.Number, TokenType.PluginCallStart, TokenType.Variable, TokenType.Constant, TokenType.LeftParenthesis, TokenType.LogicNot);
// 双重取否改布尔转换
Expression result = new LogicNotExpression(position)
{
Content = content
};
if (!(content is LogicNotExpression contentLevel1))
{
return(result);
}
result = new ToBooleanExpression(position)
{
Value = contentLevel1.Content
};
content = contentLevel1.Content;
// 布尔转换时将后续连续取否收缩至不超过一个
while (content is LogicNotExpression contentLevel2 && contentLevel2.Content is LogicNotExpression contentLevel3)
{
((ToBooleanExpression)result).Value = contentLevel3.Content;
content = contentLevel3.Content;
}
return(result);
}
public void nil_is_false()
{
// nil
var target = new ToBooleanExpression(new NullLiteralExpression());
AstHelper helper = Mother.CreateRuntime();
var result = target.Compile(helper).Eval <bool>();
Assert.IsFalse(result);
}
