/// <summary>
/// Replaces ( and ) with open and close group tokens
/// </summary>
/// <param name="tokens">tokens input</param>
/// <returns>tokens</returns>
private static List <FilterExpressionToken> ReplaceGroupTokens(List <FilterExpressionToken> tokens)
{
List <SymbolToken> openClosed = tokens.Where(x => x is PrimitiveExpressionToken pet && (pet.Token.IsSymbolToken('(') || pet.Token.IsSymbolToken(')')))
.Cast <PrimitiveExpressionToken>()
.Select(x => x.Token.CastToSymbolToken())
.ToList();
if (openClosed.Any())
{
if (openClosed.First().IsSymbolToken(')'))
{
throw new UnexpectedTokenException(openClosed.First());
}
if (openClosed.Last().IsSymbolToken('('))
{
throw new UnexpectedTokenException(openClosed.Last());
}
int openCount = openClosed.Count(x => x.IsSymbolToken('('));
int closedCount = openClosed.Count(x => x.IsSymbolToken(')'));
if (openCount > closedCount)
{
throw new UnexpectedTokenException("Not all ( are closed with )");
}
if (openCount < closedCount)
{
throw new UnexpectedTokenException("Not all ) have matching (");
}
}
else
{
return(tokens);
}
List <FilterExpressionToken> ret = tokens.ToList();
Stack <int> groupIds = new Stack <int>();
for (int i = 0; i < ret.Count; i++)
{
if (ret[i] is PrimitiveExpressionToken pet)
{
if (pet.Token.IsSymbolToken('('))
{
groupIds.Push(i);
ret[i] = new OpenGroupToken(pet.Token.CastToSymbolToken(), i, groupIds.Count);
}
else if (pet.Token.IsSymbolToken(')'))
{
ret[i] = new CloseGroupToken(pet.Token.CastToSymbolToken(), groupIds.Pop());
}
}
}
return(ret);
}
private static List <FilterExpressionToken> ReplaceMethodCallsOnProps(List <FilterExpressionToken> tokens)
{
List <PropertyExpressionToken> propTokens = tokens.Where(x => x is PropertyExpressionToken).Cast <PropertyExpressionToken>().ToList();
List <FilterExpressionToken> ret = tokens.ToList();
foreach (PropertyExpressionToken pt in propTokens)
{
int nextIndex = ret.IndexOf(pt) + 1;
if (nextIndex < ret.Count && ret[nextIndex] is OpenGroupToken)
{
OpenGroupToken open = ret[nextIndex] as OpenGroupToken;
CloseGroupToken close = ret.First(x => x is CloseGroupToken cgt && cgt.GroupId == open.GroupId) as CloseGroupToken;
int openIndex = ret.IndexOf(open);
int closeIndex = ret.IndexOf(close);
List <FilterExpressionToken> args = new List <FilterExpressionToken>();
for (int i = openIndex + 1; i < closeIndex; i++)
{
args.Add(ret[i]);
}
args = FormatAndValidateMethodArgumentTokens(args);
string methodName;
PropertyExpressionToken allButLast = pt.AllButLast(out methodName);
int ptIndex = ret.IndexOf(pt);
ret[ptIndex] = new MethodCallExpressionToken(allButLast, methodName, args.ToArray());
List <FilterExpressionToken> toRemove = new List <FilterExpressionToken>();
for (int i = ptIndex + 1; i <= closeIndex; i++)
{
ret[i] = null;
}
}
}
return(ret.Where(x => x != null).ToList());
}