private QueryExpression ParseExpression(bool scan)
{
QueryExpression rootExpression = null;
CompositeExpression parentExpression = null;
while (_currentIndex < _expression.Length)
{
var left = ParseSide(scan);
object right = null;
QueryOperator op;
if (_expression[_currentIndex] == ')' ||
_expression[_currentIndex] == '|' ||
_expression[_currentIndex] == '&')
{
op = QueryOperator.Exists;
}
else
{
op = ParseOperator();
right = ParseSide(scan);
}
var booleanExpression = new BooleanQueryExpression
{
Left = left,
Operator = op,
Right = 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)
{
var andExpression = new CompositeExpression {
Operator = 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)
{
var orExpression = new CompositeExpression {
Operator = 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.");
}
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++;
var 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.");
}
var booleanExpression = new BooleanQueryExpression {
Path = expressionPath, Operator = op, Value = (op != QueryOperator.Exists) ? new JValue(value) : null
};
if (_expression[_currentIndex] == ')')
{
if (parentExpression == null)
{
return(booleanExpression);
}
parentExpression.Expressions.Add(booleanExpression);
return(rootExpression);
}
if (_expression[_currentIndex] == '&' && Match("&&"))
{
if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
{
var 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("||"))
{
continue;
}
if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
{
var 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++;
var 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.");
}
var booleanExpression = new BooleanQueryExpression {Path = expressionPath, Operator = op, Value = (op != QueryOperator.Exists) ? new JValue(value) : null};
if (_expression[_currentIndex] == ')')
{
if (parentExpression == null) return booleanExpression;
parentExpression.Expressions.Add(booleanExpression);
return rootExpression;
}
if (_expression[_currentIndex] == '&' && Match("&&"))
{
if (parentExpression == null || parentExpression.Operator != QueryOperator.And)
{
var 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("||")) continue;
if (parentExpression == null || parentExpression.Operator != QueryOperator.Or)
{
var 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.");
}