public bool Read(out NpgsqlTsQuery result)
{
result = null;
if (_tokenPos == -1)
{
if (_buf.ReadBytesLeft < 4)
{
return(false);
}
_numTokens = _buf.ReadInt32();
_bytesLeft -= 4;
_tokenPos = 0;
}
if (_numTokens == 0)
{
result = new NpgsqlTsQueryEmpty();
_buf = null;
_nodes = null;
return(true);
}
for (; _tokenPos < _numTokens; _tokenPos++)
{
if (_buf.ReadBytesLeft < Math.Min(_bytesLeft, MaxSingleTokenBytes))
{
return(false);
}
int readPos = _buf.ReadPosition;
bool isOper = _buf.ReadByte() == 2;
if (isOper)
{
NpgsqlTsQuery.NodeKind operKind = (NpgsqlTsQuery.NodeKind)_buf.ReadByte();
if (operKind == NpgsqlTsQuery.NodeKind.Not)
{
var node = new NpgsqlTsQueryNot(null);
InsertInTree(node);
_nodes.Push(new Tuple <NpgsqlTsQuery, int>(node, 0));
}
else
{
NpgsqlTsQuery node = null;
if (operKind == NpgsqlTsQuery.NodeKind.And)
{
node = new NpgsqlTsQueryAnd(null, null);
}
else if (operKind == NpgsqlTsQuery.NodeKind.Or)
{
node = new NpgsqlTsQueryOr(null, null);
}
else
{
PGUtil.ThrowIfReached();
}
InsertInTree(node);
_nodes.Push(new Tuple <NpgsqlTsQuery, int>(node, 2));
_nodes.Push(new Tuple <NpgsqlTsQuery, int>(node, 1));
}
}
else
{
NpgsqlTsQueryLexeme.Weight weight = (NpgsqlTsQueryLexeme.Weight)_buf.ReadByte();
bool prefix = _buf.ReadByte() != 0;
string str = _buf.ReadNullTerminatedString();
InsertInTree(new NpgsqlTsQueryLexeme(str, weight, prefix));
}
_bytesLeft -= _buf.ReadPosition - readPos;
}
if (_nodes.Count != 0)
{
PGUtil.ThrowIfReached();
}
result = _value;
_buf = null;
_nodes = null;
_value = null;
return(true);
}
public Task Write(NpgsqlTsQueryAnd value, NpgsqlWriteBuffer buf, NpgsqlLengthCache lengthCache, NpgsqlParameter parameter, bool async) => Write((NpgsqlTsQuery)value, buf, lengthCache, parameter, async);
public override async ValueTask <NpgsqlTsQuery> Read(ReadBuffer buf, int len, bool async, FieldDescription fieldDescription = null)
{
await buf.Ensure(4, async);
var numTokens = buf.ReadInt32();
if (numTokens == 0)
{
return(new NpgsqlTsQueryEmpty());
}
_nodes = new Stack <Tuple <NpgsqlTsQuery, int> >();
len -= 4;
for (var tokenPos = 0; tokenPos < numTokens; tokenPos++)
{
await buf.Ensure(Math.Min(len, MaxSingleTokenBytes), async);
var readPos = buf.ReadPosition;
var isOper = buf.ReadByte() == 2;
if (isOper)
{
var operKind = (NpgsqlTsQuery.NodeKind)buf.ReadByte();
if (operKind == NpgsqlTsQuery.NodeKind.Not)
{
var node = new NpgsqlTsQueryNot(null);
InsertInTree(node);
_nodes.Push(new Tuple <NpgsqlTsQuery, int>(node, 0));
}
else
{
NpgsqlTsQuery node = null;
switch (operKind)
{
case NpgsqlTsQuery.NodeKind.And:
node = new NpgsqlTsQueryAnd(null, null);
break;
case NpgsqlTsQuery.NodeKind.Or:
node = new NpgsqlTsQueryOr(null, null);
break;
default:
throw new InvalidOperationException($"Internal Npgsql bug: unexpected value {operKind} of enum {nameof(NpgsqlTsQuery.NodeKind)}. Please file a bug.");
}
InsertInTree(node);
_nodes.Push(new Tuple <NpgsqlTsQuery, int>(node, 2));
_nodes.Push(new Tuple <NpgsqlTsQuery, int>(node, 1));
}
}
else
{
var weight = (NpgsqlTsQueryLexeme.Weight)buf.ReadByte();
var prefix = buf.ReadByte() != 0;
var str = buf.ReadNullTerminatedString();
InsertInTree(new NpgsqlTsQueryLexeme(str, weight, prefix));
}
len -= buf.ReadPosition - readPos;
}
if (_nodes.Count != 0)
{
throw new InvalidOperationException("Internal Npgsql bug, please report.");
}
return(_value);
}
public int ValidateAndGetLength(NpgsqlTsQueryAnd value, ref NpgsqlLengthCache lengthCache, NpgsqlParameter parameter) => ValidateAndGetLength((NpgsqlTsQuery)value, ref lengthCache, parameter);