private QueryExpression ParseExpression()
{
QueryExpression rootExpression = null;
CompositeExpression parentExpression = null;
while (_currentIndex < _expression.Length)
{
EatWhitespace();
if (_expression[_currentIndex] != '@')
throw new JsonException("Unexpected character while parsing path query: " + _expression[_currentIndex]);
_currentIndex++;
List<PathFilter> expressionPath = new List<PathFilter>();
if (ParsePath(expressionPath, _currentIndex, true))
throw new JsonException("Path ended with open query.");
EatWhitespace();
EnsureLength("Path ended with open query.");
QueryOperator op;
object value = null;
if (_expression[_currentIndex] == ')'
|| _expression[_currentIndex] == '|'
|| _expression[_currentIndex] == '&')
{
op = QueryOperator.Exists;
}
else
{
op = ParseOperator();
EatWhitespace();
EnsureLength("Path ended with open query.");
value = ParseValue();
EatWhitespace();
EnsureLength("Path ended with open query.");
}
BooleanQueryExpression booleanExpression = new BooleanQueryExpression
{
Path = expressionPath,
Operator = op,
Value = (op != QueryOperator.Exists) ? new JValue(value) : null
};
if (_expression[_currentIndex] == ')')
{
if (parentExpression != null)
{
parentExpression.Expressions.Add(booleanExpression);
return rootExpression;
}
return booleanExpression;
}
if (_expression[_currentIndex] == '&' && Match("&&"))
{
if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
{
CompositeExpression andExpression = new CompositeExpression { Operator = QueryOperator.And };
if (parentExpression != null)
parentExpression.Expressions.Add(andExpression);
parentExpression = andExpression;
if (rootExpression == null)
rootExpression = parentExpression;
}
parentExpression.Expressions.Add(booleanExpression);
}
if (_expression[_currentIndex] == '|' && Match("||"))
{
if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
{
CompositeExpression orExpression = new CompositeExpression { Operator = QueryOperator.Or };
if (parentExpression != null)
parentExpression.Expressions.Add(orExpression);
parentExpression = orExpression;
if (rootExpression == null)
rootExpression = parentExpression;
}
parentExpression.Expressions.Add(booleanExpression);
}
}
throw new JsonException("Path ended with open query.");
}
private QueryExpression ParseExpression()
{
QueryExpression rootExpression = null;
CompositeExpression parentExpression = null;
while (_currentIndex < _expression.Length)
{
EatWhitespace();
if (_expression[_currentIndex] != '@')
{
throw new JsonException("Unexpected character while parsing path query: " + _expression[_currentIndex]);
}
_currentIndex++;
List<PathFilter> expressionPath = new List<PathFilter>();
if (ParsePath(expressionPath, _currentIndex, true))
{
throw new JsonException("Path ended with open query.");
}
EatWhitespace();
EnsureLength("Path ended with open query.");
QueryOperator op;
object value = null;
if (_expression[_currentIndex] == ')'
|| _expression[_currentIndex] == '|'
|| _expression[_currentIndex] == '&')
{
op = QueryOperator.Exists;
}
else
{
op = ParseOperator();
EatWhitespace();
EnsureLength("Path ended with open query.");
value = ParseValue();
EatWhitespace();
EnsureLength("Path ended with open query.");
}
BooleanQueryExpression booleanExpression = new BooleanQueryExpression
{
Path = expressionPath,
Operator = op,
Value = (op != QueryOperator.Exists) ? new JValue(value) : null
};
if (_expression[_currentIndex] == ')')
{
if (parentExpression != null)
{
parentExpression.Expressions.Add(booleanExpression);
return rootExpression;
}
return booleanExpression;
}
if (_expression[_currentIndex] == '&' && Match("&&"))
{
if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
{
CompositeExpression andExpression = new CompositeExpression { Operator = QueryOperator.And };
if (parentExpression != null)
{
parentExpression.Expressions.Add(andExpression);
}
parentExpression = andExpression;
if (rootExpression == null)
{
rootExpression = parentExpression;
}
}
parentExpression.Expressions.Add(booleanExpression);
}
if (_expression[_currentIndex] == '|' && Match("||"))
{
if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
{
CompositeExpression orExpression = new CompositeExpression { Operator = QueryOperator.Or };
if (parentExpression != null)
{
parentExpression.Expressions.Add(orExpression);
}
parentExpression = orExpression;
if (rootExpression == null)
{
rootExpression = parentExpression;
}
}
parentExpression.Expressions.Add(booleanExpression);
}
}
throw new JsonException("Path ended with open query.");
}
private QueryExpression ParseExpression()
{
QueryExpression? rootExpression = null;
CompositeExpression?parentExpression = null;
while (_currentIndex < _expression.Length)
{
object left = ParseSide();
object?right = null;
QueryOperator op;
if (_expression[_currentIndex] == ')' ||
_expression[_currentIndex] == '|' ||
_expression[_currentIndex] == '&')
{
op = QueryOperator.Exists;
}
else
{
op = ParseOperator();
right = ParseSide();
}
BooleanQueryExpression booleanExpression = new BooleanQueryExpression(op, left, right);
if (_expression[_currentIndex] == ')')
{
if (parentExpression != null)
{
parentExpression.Expressions.Add(booleanExpression);
return(rootExpression !);
}
return(booleanExpression);
}
if (_expression[_currentIndex] == '&')
{
if (!Match("&&"))
{
throw CreateUnexpectedCharacterException();
}
if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
{
CompositeExpression andExpression = new CompositeExpression(QueryOperator.And);
parentExpression?.Expressions.Add(andExpression);
parentExpression = andExpression;
if (rootExpression == null)
{
rootExpression = parentExpression;
}
}
parentExpression.Expressions.Add(booleanExpression);
}
if (_expression[_currentIndex] == '|')
{
if (!Match("||"))
{
throw CreateUnexpectedCharacterException();
}
if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
{
CompositeExpression orExpression = new CompositeExpression(QueryOperator.Or);
parentExpression?.Expressions.Add(orExpression);
parentExpression = orExpression;
if (rootExpression == null)
{
rootExpression = parentExpression;
}
}
parentExpression.Expressions.Add(booleanExpression);
}
}
throw new JsonException("Path ended with open query.");
}