static string GetVarName(string equation, int index, EquationElement root)
{
string varname = Term.ExtractName(equation, index).ToLower();
if (root != null && root.VarExist(varname))
{
return(varname);
}
char ch = equation[index];
if (ch >= 'a' && ch <= 'z')
{
//return new string(new char[] { ch });
return(varname);
}
if (ch >= 'A' && ch <= 'Z')
{
// return new string(new char[] { ch });
return(varname);
}
if (ch == '_')
{
// return new string(new char[] { ch });
return(varname);
}
return(string.Empty);
}
static bool IsPI(string equation, int index)
{
if (equation.Length > index + 1)
{
string spi = Term.ExtractName(equation, index, false).ToLower();
if (spi == "pi")
{
return(true);
}
}
return(false);
}
static public bool IsValidDigit(string equation, int index)
{
string spi = Term.ExtractName(equation, index).ToLower();
if (spi.Length < 2)
{
return(false);
}
if (Functions.ContainsKey(spi))
{
return(true);
}
if (Functions2.ContainsKey(spi))
{
return(true);
}
if (FunctionsIF.ContainsKey(spi))
{
return(true);
}
return(false);
}
public Function(string src, int start, EquationElement root)
{
m_startIndex = start;
m_func = Term.ExtractName(src, start).ToLower();
start += m_func.Length;
// space는 무시, 다음문자는 무조건 괄호가 와야함.
while (src[start] == ' ')
{
start++;
}
if (src[start] != '(')
{
throw new ParseException(src, m_startIndex, "함수는 무조건 () 로 실행해야 합니다.'");
}
int termstart = start;
int end = Term.FindMatchingEnd('(', src, termstart);
if (end < termstart)
{
throw new ParseException(src, m_startIndex, "함수 매칭 실패");
}
m_endindex = end;
string allterms = src.Substring(termstart + 1, end - termstart - 1);
//string[] terms = allterms.Split(',');
string[] terms = GetTerms(allterms);
m_terms = new List <Term>();
foreach (string term in terms)
{
Term newterm = new Term();
newterm.Parse(term, root);
newterm.Parent = this;
m_terms.Add(newterm);
}
}