public void Parse(string keyword)
{
if (string.IsNullOrEmpty(keyword))
throw new Exception("Keyword belirtilmemiş.");
i = -1;
if (!keyword.Contains("<")) keyword = "<" + keyword + ">";
this.keyword = keyword;
currentToken = readNextToken();
if (!(currentToken.IsWord || currentToken.Value == "("))
throw new Exception("Keyword <kelime> veya parantez ile başlamalıdır.");
/*
Expression currExp = new Word { TheWord = t.Value };
while (t != null)
{
string tValue = t.Value;
if (!t.IsWord && (tValue == "+" || tValue == "-" || tValue == "^"))
{
t = readNextToken();
if (t == null)
throw new Exception("Bir keyword +, - ya da ^ ile bitemez.");
if (!t.IsWord)
throw new Exception("<kelime> gerekli");
if (tValue == "+")
currExp = new PlusExpression() { Exp1 = currExp, Exp2 = new Word { TheWord = t.Value } };
else if (tValue == "-")
currExp = new MinusExpression() { Exp1 = currExp, Exp2 = new Word { TheWord = t.Value } };
else
currExp = new ButNotExpression() { Exp1 = (Word)currExp, Exp2 = new Word { TheWord = t.Value } };
}
else if (!t.IsWord && t.Value == "|")
{
list.Add(currExp);
t = readNextToken();
if (!t.IsWord)
throw new Exception("Yeni keyword <kelime> ile başlamalıdır");
currExp = new Word { TheWord = t.Value };
}
else
{
t = readNextToken();
if (t == null)
break;
}
}
*/
parsedExpression = parseExpression();
}
Token readNextToken()
{
Token res = null;
i++;
if (i >= keyword.Length)
{
currentToken = null;
return currentToken;
}
char c = keyword[i];
if (c == '<')
{
int wordStart = ++i;
for (; i < keyword.Length; i++)
if (keyword[i] == '>')
{
res = new Token() { IsWord = true, Value = keyword.Substring(wordStart, i - wordStart) };
break;
}
}
else if (c == '|' || c == '+' || c == '-' || c == '^' || c == '(' || c == ')')
res = new Token() { IsWord = false, Value = c.ToString() };
else
return readNextToken();
currentToken = res;
return res;
}