private void BuildGroups(IList<Token> tokens, NodeContext context)
{
for (int i = 0; i < tokens.Count; i++)
{
var token = tokens[i];
switch (token.Type)
{
case TokenType.Word:
{
var node = new TermNode(token.Text);
context.AddChild(node);
}
break;
case TokenType.BooleanAnd:
{
var node = new BooleanNode(BooleanType.And);
context.AddChild(node);
}
break;
case TokenType.BooleanOr:
{
var node = new BooleanNode(BooleanType.Or);
context.AddChild(node);
}
break;
case TokenType.Operator:
{
var node = new OperatorNode(token.Text);
context.AddChild(node);
}
break;
case TokenType.ParenthesisOpen:
{
var group = new ParenthesisGroupNode();
context.PushParent(group);
}
break;
case TokenType.ParenthesisClose:
{
context.PopParent();
}
break;
case TokenType.Quote:
// Quotes should have been removed by BuildSentences().
throw new Exception();
case TokenType.UnaryNot:
{
var node = new UnaryNode(UnaryType.Not);
context.AddChild(node);
}
break;
default:
throw new NotImplementedException();
}
}
}
