public static void AddExpression(int prec, Parser<IExpression> p)
{
if (!ExpressionList.ContainsKey(prec))
ExpressionList[prec] = new List<Parser<IExpression>>();
ExpressionList[prec].Add(p);
ExpressionCache = null;
SimpleExpressionCache = null;
RebuildExp();
}
public static void AddOperator(int prec, string name, Func<IExpression, IExpression, Operator> op)
{
if (!OperatorList.ContainsKey(prec))
OperatorList[prec] = new List<Tuple<string, Func<IExpression, IExpression, Operator>>>();
OperatorList[prec].Add(new Tuple<string,Func<IExpression,IExpression,Operator>>(name, op));
ExpressionCache = null;
SimpleExpressionCache = null;
}
private static Parser<IExpression> RebuildExp(bool simple = false)
{
// sort by precedence
var precs = new List<int>(ExpressionList.Keys);
foreach (var k in OperatorList.Keys)
if (!ExpressionList.ContainsKey(k))
precs.Add(k);
// descending
precs.Sort((a, b) => b.CompareTo(a));
foreach (var k in precs)
{
// expressions
if (ExpressionList.ContainsKey(k))
foreach (var v in ExpressionList[k])
if (ExpressionCache == null)
{
ExpressionCache = v;
SimpleExpressionCache = v;
}
else
{
// Mirror all changes into the simple expression
ExpressionCache = ExpressionCache.Or(v);
SimpleExpressionCache = SimpleExpressionCache.Or(v);
}
// operators
if (OperatorList.ContainsKey(k))
{
Parser<Func<IExpression, IExpression, Operator>> cache = null;
foreach (var op in OperatorList[k])
{
var c = op; // closure
var p = //from s1 in Parse.Char('_')
from symbol in Parse.String(c.Item1)
//from s2 in Parse.Char('_')
select c.Item2;
if (cache == null)
cache = p;
else
cache = cache.Or(p);
}
ExpressionCache = Parse.ChainOperator(cache, ExpressionCache.Token(), (op, left, right) => op(left, right));
}
}
return ExpressionCache;
}