void Preprocess(List <RuleMatch> rules)
{
RuleMatch prevRule = null;
for (var i = 0; i < rules.Count; i++)
{
if (rules[i].Rule.Type == GrammarTokenType.Operator && (prevRule == null ||
(prevRule.Rule.Type == GrammarTokenType.Operator && prevRule.Rule.Operands == 2) ||
(prevRule.Rule.Type == GrammarTokenType.Operator && prevRule.Rule.Operands == 1 && prevRule.Rule.Associativity == GrammarTokenAssociativity.Right) ||
(prevRule.Rule.Type == GrammarTokenType.LeftParenthesis)))
{
if (rules[i].Lexem.Text == "-")
{
rules[i] = _sy.Match(new Lexem("u-", typeof(string), Kinds.Operator));
}
else if (rules[i].Lexem.Text == "+")
{
rules[i] = _sy.Match(new Lexem("u+", typeof(string), Kinds.Operator));
}
}
prevRule = rules[i];
}
}