private PhraseTypeEnum _lastOpForError; //可能引起错误的那个运算符
public SemanticAnalyzer(ref PhraseStorage ps)
{
_optr = new Stack();
_opnd = new Stack();
_op = new Stack();
_ps = ps;
}
public PhraseAnalyzer(string sentence, ref PhraseStorage ps)
{
//清除前一次的词法分析结果
_ps = ps;
_ps.ClearResult();
//保存句子
_sentence = sentence;
_succeed = true;
//小写化句子中的所有字母
_chArray = sentence.ToLower().ToCharArray();
if (Analyze() == false) //出错
{
_ps.AddPhraseResult("Error", PhraseTypeEnum.unknown);
}
}
public static PhraseStorage SplitFormula(this string formula)
{
PhraseStorage ps = new PhraseStorage();
PhraseAnalyzer pa = new PhraseAnalyzer(formula + "#=", ref ps);
if (pa.Succeed == false)
{
throw new Exception(string.Format("公式“{0}”错误", formula));;
}
SemanticAnalyzer sa = new SemanticAnalyzer(ref ps);
if (sa.Check() == false)
{
throw new Exception(string.Format("公式“{0}”有误，{1}", formula, sa.ErrorTip));;
}
return(ps);
}
/// <summary>
/// 将A/B/C拆分成(A/B)/C 后处理除号成DECODE函数
/// </summary>
/// <param name="ps"></param>
/// <param name="phraseTypeList"></param>
/// <param name="ifZero"></param>
/// <returns></returns>
public static string PhraseStorageDecode(PhraseStorage ps, List <PhraseTypeEnum> phraseTypeList, decimal ifZero)
{
StringCollection psCopy = new StringCollection();
foreach (string sCopy in ps.PhraseResult)
{
psCopy.Add(sCopy);
}
List <PhraseTypeEnum> phraseList = new List <PhraseTypeEnum>(ps.PhraseTypeResult);
for (int i = 0; i < phraseList.Count; i++)
{
if (phraseList[i] == PhraseTypeEnum.divide)
{
int tmp = 0;
int n = i - 1;
for (; n > 0; n--)
{
if (phraseList[n] == PhraseTypeEnum.rightbracket)
{
tmp++;
}
else if (phraseList[n] == PhraseTypeEnum.leftbracket)
{
tmp--;
if (tmp == 0)
{
break;
}
}
else if (phraseList[n] == PhraseTypeEnum.number)
{
if (tmp == 0)
{
break;
}
}
else
{
if (tmp == 0)
{
n = n + 1;
break;
}
}
}
tmp = 0;
int k = i + 1;
for (; k < phraseList.Count; k++)
{
if (phraseList[k] == PhraseTypeEnum.rightbracket)
{
tmp--;
if (tmp == 0)
{
break;
}
}
else if (phraseList[k] == PhraseTypeEnum.leftbracket)
{
tmp++;
}
else if (phraseList[k] == PhraseTypeEnum.number)
{
if (tmp == 0)
{
k = k + 1;
break;
}
}
else
{
if (tmp == 0)
{
break;
}
}
}
if (k == psCopy.Count)
{
psCopy.Add(")");
phraseList.Add(PhraseTypeEnum.rightbracket);
}
else
{
psCopy.Insert(k, ")");
phraseList.Insert(k, PhraseTypeEnum.rightbracket);
}
psCopy.Insert(n, "(");
phraseList.Insert(n, PhraseTypeEnum.leftbracket);
i = k + 1;
}
}
return(Formula2Decode(psCopy, phraseList, 0, psCopy.Count, ifZero));
}
