public override void DoThings(int action, Hubble.Framework.DataStructure.DFA <Hubble.Core.SFQL.LexicalAnalysis.Lexical.Token, WhereStateFunction> dfa)
{
Where where = dfa as Where;
switch (Func)
{
case WhereStateFunction.LBracket:
where.LastLogicFunc = LogicFunc.None;
where.ExpressionTreeStack.Push(where.CurrentExpressionTree);
where.CurrentExpressionTree = new ExpressionTree(null);
break;
case WhereStateFunction.RBracket:
where.LastLogicFunc = LogicFunc.None;
if (where.ExpressionTreeStack.Count <= 0)
{
throw new SyntaxException("Half-baked bracket", where,
new Hubble.Framework.DataStructure.DFAException("Half-baked bracket",
action, -1), dfa.CurrentToken);
}
ExpressionTree upTree = where.ExpressionTreeStack.Pop();
while (where.CurrentExpressionTree.Parent != null)
{
where.CurrentExpressionTree = where.CurrentExpressionTree.Parent;
}
upTree.Expression = where.CurrentExpressionTree;
where.CurrentExpressionTree = upTree;
break;
case WhereStateFunction.Left:
if (where.CurrentExpressionTree.Expression == null)
{
where.CurrentExpressionTree.Expression = new Expression();
}
((Expression) where.CurrentExpressionTree.Expression).Left.Add(dfa.CurrentToken);
break;
case WhereStateFunction.Right:
((Expression) where.CurrentExpressionTree.Expression).Right.Add(dfa.CurrentToken);
break;
case WhereStateFunction.Operator:
((Expression) where.CurrentExpressionTree.Expression).Operator = dfa.CurrentToken;
break;
case WhereStateFunction.AndOr:
switch (dfa.CurrentToken.SyntaxType)
{
case SyntaxType.AND:
if (where.LastLogicFunc == LogicFunc.Or)
{
throw new SyntaxException("And Or can't in same short sentence without bracket. Eg. a > 0 and c < 10 or b > 0 must be a > 0 and c < 10 or (b > 0) ",
where, new Hubble.Framework.DataStructure.DFAException("Half-baked bracket",
action, -1), dfa.CurrentToken);
}
where.LastLogicFunc = LogicFunc.And;
where.CurrentExpressionTree.AndChild = new ExpressionTree(where.CurrentExpressionTree);
where.CurrentExpressionTree = where.CurrentExpressionTree.AndChild;
break;
case SyntaxType.OR:
if (where.LastLogicFunc == LogicFunc.And)
{
throw new SyntaxException("And Or can't in same short sentence without bracket. Eg. a > 0 and c < 10 or b > 0 must be a > 0 and c < 10 or (b > 0) ",
where, new Hubble.Framework.DataStructure.DFAException("Half-baked bracket",
action, -1), dfa.CurrentToken);
}
where.LastLogicFunc = LogicFunc.Or;
where.CurrentExpressionTree.OrChild = new ExpressionTree(where.CurrentExpressionTree);
where.CurrentExpressionTree = where.CurrentExpressionTree.OrChild;
break;
}
break;
case WhereStateFunction.Quit:
if (where.ExpressionTreeStack.Count > 0)
{
throw new SyntaxException("Half-baked bracket", where,
new Hubble.Framework.DataStructure.DFAException("Half-baked bracket",
action, -1), dfa.CurrentToken);
}
break;
}
}
public ExpressionTree(ExpressionTree parent)
{
Parent = parent;
}