private bool ParsePath(List<PathFilter> filters, int currentPartStartIndex, bool query)
{
bool scan = false;
bool followingIndexer = false;
bool followingDot = false;
bool ended = false;
while (_currentIndex < _expression.Length && !ended)
{
char currentChar = _expression[_currentIndex];
switch (currentChar)
{
case '[':
case '(':
if (_currentIndex > currentPartStartIndex)
{
string member = _expression.Substring(currentPartStartIndex, _currentIndex - currentPartStartIndex);
PathFilter filter = (scan) ? (PathFilter)new ScanFilter() { Name = member } : new FieldFilter() { Name = member };
filters.Add(filter);
scan = false;
}
filters.Add(ParseIndexer(currentChar));
_currentIndex++;
currentPartStartIndex = _currentIndex;
followingIndexer = true;
followingDot = false;
break;
case ']':
case ')':
ended = true;
break;
case ' ':
//EatWhitespace();
if (_currentIndex < _expression.Length)
ended = true;
break;
case '.':
if (_currentIndex > currentPartStartIndex)
{
string member = _expression.Substring(currentPartStartIndex, _currentIndex - currentPartStartIndex);
if (member == "*")
member = null;
PathFilter filter = (scan) ? (PathFilter)new ScanFilter() { Name = member } : new FieldFilter() { Name = member };
filters.Add(filter);
scan = false;
}
if (_currentIndex + 1 < _expression.Length && _expression[_currentIndex + 1] == '.')
{
scan = true;
_currentIndex++;
}
_currentIndex++;
currentPartStartIndex = _currentIndex;
followingIndexer = false;
followingDot = true;
break;
default:
if (query && (currentChar == '=' || currentChar == '<' || currentChar == '!' || currentChar == '>' || currentChar == '|' || currentChar == '&'))
{
ended = true;
}
else
{
if (followingIndexer)
throw new JsonException("Unexpected character following indexer: " + currentChar);
_currentIndex++;
}
break;
}
}
bool atPathEnd = (_currentIndex == _expression.Length);
if (_currentIndex > currentPartStartIndex)
{
string member = _expression.Substring(currentPartStartIndex, _currentIndex - currentPartStartIndex).TrimEnd();
if (member == "*")
member = null;
PathFilter filter = (scan) ? (PathFilter)new ScanFilter() { Name = member } : new FieldFilter() { Name = member };
filters.Add(filter);
}
else
{
// no field name following dot in path and at end of base path/query
if (followingDot && (atPathEnd || query))
throw new JsonException("Unexpected end while parsing path.");
}
return atPathEnd;
}
private static PathFilter CreatePathFilter(string?member, bool scan)
{
PathFilter filter = (scan) ? (PathFilter) new ScanFilter(member) : new FieldFilter(member);
return(filter);
}