public Int32 InitExpression(string strContent)
{
string strValue = string.Empty;
for (Int32 i = 0; i < strContent.Length; i++)
{
if (strContent[i] == '(')
{
EquationExpression equation = new EquationExpression();
i += equation.InitExpression(strContent.Substring(i + 1));
_stackValues.Push(equation);
}
else if (_dicExpressions.ContainsKey(strContent[i]))
{
if (!string.IsNullOrEmpty(strValue))
{
_stackValues.Push(new ValueExpression(strValue));
strValue = string.Empty;
}
Type type = _dicExpressions[strContent[i]];
INonTerminalExpression next = (INonTerminalExpression)Activator.CreateInstance(type);
if (_stackExpressions.Count > 0)
{
INonTerminalExpression top = _stackExpressions.Peek();
if (top.Level > next.Level)
{
ITerminalExpression value1 = _stackValues.Pop();
ITerminalExpression value2 = _stackValues.Pop();
_stackValues.Push(next.Interpret(value1, value2));
_stackExpressions.Pop();
}
}
_stackExpressions.Push(next);
}
else if (strContent[i] == ')')
{
_stackValues.Push(new ValueExpression(strValue));
strValue = string.Empty;
return(i + 1);
}
else
{
strValue += strContent[i];
}
}
if (!string.IsNullOrEmpty(strValue))
{
_stackValues.Push(new ValueExpression(strValue));
strValue = string.Empty;
}
return(-1);
}
public ITerminalExpression Interpret(ITerminalExpression db1, ITerminalExpression db2)
{
return(new ValueExpression(db1.Value / db2.Value));
}
