/// <summary>
/// 计算表达式
/// </summary>
public static object ExecExpressions(List<InnerExpression> exps)
{
if (exps.Count == 0) return "";
while (exps.Count > 1)
{
List<int> priIdxes = GetMaxPriorityExpIndexes(exps);
int total = exps.Count;
int offSet = 0, cIdx = 0;
InnerExpression tempExp = null;
InnerOperate op = null;
if (priIdxes.Count == 0)
{
#region 没有操作符号的数学运算
while (exps.Count >= 2)
{
tempExp = new InnerExpression();
if (Regex.IsMatch(exps[1].TagDefinition,
InnerExpression.ArrayIndexFetchPattern, RegexOptions.Compiled))
{
#region 数组下标直接获取 "ab"[0] = "a"
string strExpValue = exps[0].GetValue().ToString();
int arrIdx = Convert.ToInt32(exps[1].TagDefinition.Trim('[', ']'));
tempExp.TagDefinition = (arrIdx < strExpValue.Length) ? strExpValue[arrIdx].ToString() : strExpValue;
tempExp.IsString = true;
#endregion
}
else
{
tempExp.TagDefinition = InnerExpression.ComputeTwo(exps[0], new InnerOperate("+"), exps[1]).ToString();
tempExp.IsString = exps[0].IsString;
}
tempExp.IsEntity = true;
exps[0] = tempExp;
exps.RemoveAt(1);
}
#endregion
}
else
{
#region 处理同级运算
foreach (int idx in priIdxes)
{
cIdx = idx + offSet;
//Util.Debug(false, cIdx);
op = new InnerOperate(exps[cIdx].GetValue().ToString());
if (op.IsUnary())
{
#region 一元 自增/减操作 直接运算
// ++i
if ((idx + 1) < total)
{
tempExp = new InnerExpression();
tempExp.TagDefinition = InnerExpression.ComputeOne(exps[cIdx + 1], op).ToString();
tempExp.IsEntity = true;
exps[cIdx + 1] = tempExp;
exps.RemoveAt(cIdx);
offSet -= 1;
}
else
{
//i++
if (idx > 0)
{
tempExp = new InnerExpression();
tempExp.TagDefinition = InnerExpression.ComputeOne(exps[cIdx - 1], op).ToString();
tempExp.IsEntity = true;
exps[cIdx - 1] = tempExp;
exps.RemoveAt(cIdx);
offSet -= 1;
}
}
#endregion
}
else if (op.IsTernary())
{
//最低优先级 ? a : b
#region 三目条件运算符
if (idx + 3 < total)
{
tempExp = new InnerExpression();
tempExp.TagDefinition = (Convert.ToBoolean(exps[cIdx - 1].GetValue()) ? exps[cIdx + 1].GetValue() : exps[cIdx + 3].GetValue()).ToString();
tempExp.IsEntity = true;
exps[cIdx - 1] = tempExp;
exps.RemoveAt(cIdx);
exps.RemoveAt(cIdx);
exps.RemoveAt(cIdx);
exps.RemoveAt(cIdx);
offSet -= 4;
}
#endregion
}
else
{
#region 双目运算
if (exps.Count >= 3)
{
tempExp = new InnerExpression();
tempExp.TagDefinition = InnerExpression.ComputeTwo(exps[cIdx - 1], op, exps[cIdx + 1]).ToString();
tempExp.IsString = exps[cIdx - 1].IsString;
tempExp.IsEntity = true;
exps[cIdx - 1] = tempExp;
exps.RemoveAt(cIdx);
exps.RemoveAt(cIdx);
offSet -= 2;
}
else
{
//无效运算操作
exps.RemoveAt(cIdx);
offSet -= 1;
}
#endregion
}
}
#endregion
}
//Util.Debug(false, "当前还剩余：" + exps.Count.ToString());
//foreach (InnerExpression tex in exps)
//{
// Util.Debug(false, tex.GetValue());
//}
}
return exps[0].GetValue();
}
