/// <summary>
/// 处理表达式
/// </summary>
/// <param name="sub"> 是否是子表达式,即，在括号内 </param>
/// <param name="expression"> 表达式 </param>
/// <returns> 计算得到的逻辑值 </returns>
private bool Process(bool sub, string expression)
{
if (string.IsNullOrEmpty(expression))
{
throw new ArgumentNullException("expression");
}
var c = expression.ToCharArray();
var length = c.Length;
var flag = false;
var start = false; //是否有过一次 与或计算
var mark = false; //读取括号中的内容
var logic = true; //true是& false是|
var queue = new Queue <char>(); //存入数字
var temp = false; //最小表达式的值
for (var i = 0; i < length; i++)
{
if (c[i].Equals('('))
{
mark = true;
temp = true;
}
else if (c[i].Equals(')'))
{
var b = Process(true, new string(queue.ToArray()));
flag = GetLogicValue(start, logic, flag, b);
temp = GetLogicValue(false, logic, temp, b);
iLogical.ConditionBlock(new string(queue.ToArray()), temp, true);
start = true;
mark = false;
queue.Clear();
}
else if (c[i].Equals(or))//逻辑或
{
if (mark)
{
queue.Enqueue(c[i]);
continue;
}
if (queue.Count != 0)
{
bool b = iLogical.ProcessItem(new string(queue.ToArray()), sub);
flag = GetLogicValue(start, logic, flag, b);
temp = GetLogicValue(false, logic, temp, b);
if (!sub)
{
iLogical.ConditionBlock(new string(queue.ToArray()), temp, false);
}
}
logic = false;
start = true;
queue.Clear();
}
else if (c[i].Equals(and))//逻辑与
{
if (mark)
{
queue.Enqueue(c[i]);
continue;
}
if (queue.Count != 0)
{
bool b = iLogical.ProcessItem(new string(queue.ToArray()), sub);
flag = GetLogicValue(start, logic, flag, b);
temp = GetLogicValue(false, logic, temp, b);
if (!sub)
{
iLogical.ConditionBlock(new string(queue.ToArray()), temp, false);
}
}
logic = true;
start = true;
queue.Clear();
}
else //if( char.IsDigit(c[i]) )
{
queue.Enqueue(c[i]);
}
}
if (queue.Count != 0)
{
bool b = iLogical.ProcessItem(new string(queue.ToArray()), sub);
flag = GetLogicValue(start, logic, flag, b);
temp = GetLogicValue(false, logic, temp, b);
if (!sub)
{
iLogical.ConditionBlock(new string(queue.ToArray()), temp, false);
}
}
return(flag);
}
