//変数を実際の値に置き換えて返却する
public static string replaceVariable(string targetExpression, IVariableRepository variableRepository)
{
bool parsingVariable = false;
string finalExpression = "";
StringBuilder stringBuilder = new StringBuilder();
Stack <string> var_stack = new Stack <string>(); //２重、３重カッコに対応
for (var i = 0; i < targetExpression.Length; i++)
{
char c = targetExpression[i];
switch (c)
{
case '{':
var currentBatch = stringBuilder.ToString();
if (parsingVariable)
{
var_stack.Push(currentBatch);
}
else
{
finalExpression += currentBatch;
parsingVariable = true;
}
stringBuilder.Clear();
break;
case '}':
string variableName = stringBuilder.ToString();
if (parsingVariable)
{
string var_val = variableRepository.GetString(variableName);
if (var_stack.Count == 0)
{
parsingVariable = false;
stringBuilder.Clear();
finalExpression += var_val;
}
else
{
string stack_var = var_stack.Pop();
stringBuilder.Clear();
stringBuilder.Append(stack_var);
stringBuilder.Append(var_val);
}
}
break;
default:
stringBuilder.Append(c);
break;
}
}
if (stringBuilder.Length > 0)
{
finalExpression += stringBuilder.ToString();
}
finalExpression = variableRepository.GetString(finalExpression);
return(finalExpression);
}