/// <summary>
/// 式を展開する
/// </summary>
/// <param name="f"></param>
/// <returns></returns>
public async static Task <Formula> ExpandCharFormula(string f)
{
f = SolveNumFormulas.LaTeXtoFormula(f);
var ret = await Expand(f);
Trace.WriteLine("Expanded:" + ret.GetString());
return(ret);
}
/// <summary>
/// 文字式(未整理)の累乗を処理
/// </summary>
/// <param name="f"></param>
/// <returns></returns>
public static async Task <string> ExpandPowAsync(string f)
{
if (f.Contains("^"))
{
f = Regex.Replace(f, "^\\^(\\+|-)?(\\d|\\.)*", ""); //頭の累乗記号＋数字は消す
f = Regex.Replace(f, "\\^$", ""); //末尾の累乗記号も消す
f = Regex.Replace(f, "\\^([a-z|A-Z])", "$1"); //文字で累乗されている場合は累乗をなかったことにする
f = Regex.Replace(f, "[a-z|A-Z]\\^(\\d)+", Match =>
{
return(new string(Match.Value.First(), int.Parse(Regex.Replace(Match.Value, "(.*)(\\d+)(.*)", "$2"))));
});
while (f.Contains("^"))
{
int PowIndex = f.IndexOf('^');
if (PowIndex == 0)
{
throw new Exception(AppResources.PowerMustTop);
}
string Powed = "1";
if (f[PowIndex - 1] == ')')
{
//Xamarin.Forms.DependencyService.Get<IToastService>()
//.Show("括弧に'^'は付けられません");
Powed = "(" + OperateBrackets.TakeoutInsideofBracket(f, PowIndex - 2) + ")";
throw new Exception(AppResources.CantAddPowerAfterParenthes);
}
else if (Regex.IsMatch(f[PowIndex - 1].ToString(), "(\\+|-)?(\\d|\\.)"))
{
Powed = Regex.Match(f.Substring(0, PowIndex), "(\\+|-)?(\\d+|\\.)$").Value;
}
else
{
Powed = f[PowIndex - 1].ToString();
}
Double Powist = 1.0;
if (f[PowIndex + 1] == '(')
{
var content = OperateBrackets.TakeoutInsideofBracket(f, PowIndex + 1);
if (Regex.IsMatch(content, "[a-z]"))
{
throw new Exception(AppResources.CantAddPowerAfterChar);
}
Powist = await SolveNumFormulas.SolveNumFormula(content);
f = f.Remove(PowIndex - 1, content.Length + 4);//^の分(1)+カッコの分(2)+
}
else
{
var content = Regex.Match(f.Substring(PowIndex), "^(\\+|-)?(\\d|\\.)+").Value;
Powist = double.Parse(content);
f = f.Remove(PowIndex - 1, content.Length + 2);
}
var repeated = "";
if (double.TryParse(Powed, out double Poweddouble))
{
repeated = Math.Pow(Poweddouble, Powist).ToString();
}
else
{
repeated = string.Concat(Enumerable.Repeat(Powed, (int)Powist));
}
f = f.Insert(PowIndex - 1, repeated);
}
}
return(f);
}
