public void Bind(Atomic right, Atomic left = null)
{
// Unary
if (left == null)
{
if (Term == NTerm.Binomial)
{
throw new InvalidOperationException();
}
RightAtomic = right;
}
// Binomial
else
{
if (Term == NTerm.Unary)
{
throw new InvalidOperationException();
}
RightAtomic = right;
LeftAtomic = left;
}
IsBinded = true;
}
public void Parse()
{
var copied = atomicList.ToList();
while (atomicList.Count > 1)
{
var max = -1;
var ind = 0;
var maxInd = 0;
OperatorAtomic atomic = null;
var bLeftInd = 0;
var bRightInd = 0;
var atom = atomicList.FirstOrDefault(x =>
{
if (x is BracketAtomic braAtom)
{
return(true);
}
bLeftInd++;
return(false);
}) as BracketAtomic;
if (atom != null)
{
var right = atomicList.FirstOrDefault(x =>
{
if (x is BracketAtomic rightItem &&
rightItem.BracketType == BracketType.Right &&
atom.BracketLevel == rightItem.BracketLevel)
{
return(true);
}
bRightInd++;
return(false);
});
if (atom.BracketType == BracketType.Left && right != null)
{
var parsed = BracketParse(bLeftInd + 1, bRightInd - 1);
atomicList.RemoveRange(bLeftInd, bRightInd - bLeftInd + 1);
atomicList.Insert(bLeftInd, parsed);
continue;
}
else
{
throw new InvalidOperationException("invalid bracket");
}
}
foreach (var item in atomicList)
{
if (item is OperatorAtomic opeatom)
{
int priority = (int)opeatom.OpType;
if (opeatom.IsBinded)
{
priority = -1;
}
if (max < priority)
{
max = priority;
maxInd = ind;
atomic = opeatom;
}
}
ind++;
}
if (atomic != null)
{
try
{
var rightInd = maxInd + 1;
if (atomic.Term == NTerm.Binomial)
{
var leftInd = maxInd - 1;
atomic.Bind(atomicList[rightInd], atomicList[leftInd]);
atomicList.RemoveAt(rightInd);
atomicList.RemoveAt(leftInd);
}
else if (atomic.Term == NTerm.Unary)
{
atomic.Bind(atomicList[rightInd]);
atomicList.RemoveAt(rightInd);
}
}
catch (IndexOutOfRangeException)
{
throw new InvalidOperationException("invalid expression");
}
}
}
ParsedAtomic = atomicList.First();
atomicList = copied;
}