public virtual ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
expression.Expression = VisitExpression(expression.Expression);
expression.LowerBound = VisitExpression(expression.LowerBound);
expression.UpperBound = VisitExpression(expression.UpperBound);
return(expression);
}
private static bool VisitBetweenExpression(BetweenExpression node1, BetweenExpression node2)
{
return(node2 != null &&
Visit(node1.Expression, node2.Expression) &&
Visit(node1.LowerBound, node2.LowerBound) &&
Visit(node1.UpperBound, node2.UpperBound));
}
private static bool NeedParentheses(ExpressionNode childExpression, int parentPrecedence, bool isRightOperand)
{
// If childExpression is also an operator expression we may need parentheses.
//
// This depends on the precedence and associativity of the child operator.
// Since we have unary, binary and ternary operators we extract theses pieces
// of information using casts.
int childPrecedence;
bool isRightAssociative;
OperatorExpression expressionOperatorExpression = childExpression as OperatorExpression;
if (expressionOperatorExpression != null)
{
// It is a binary or unary operator.
childPrecedence = expressionOperatorExpression.Op.Precedence;
isRightAssociative = expressionOperatorExpression.Op.IsRightAssociative;
}
else
{
// Special handling for the only ternary operator.
BetweenExpression expressionAsBetweenExpression = childExpression as BetweenExpression;
if (expressionAsBetweenExpression != null)
{
childPrecedence = Operator.BETWEEN_PRECEDENCE;
isRightAssociative = false;
}
else
{
return(false);
}
}
// Analyze precedences.
if (childPrecedence < parentPrecedence)
{
return(true);
}
if (childPrecedence == parentPrecedence)
{
if (isRightOperand && !isRightAssociative)
{
return(true);
}
if (!isRightOperand && isRightAssociative)
{
return(true);
}
}
return(false);
}
public override ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
_xmlWriter.WriteStartElement("betweenExpression");
WriteTypeAttribute(expression.ExpressionType);
WriteAstNode("lowerBound", expression.LowerBound);
WriteAstNode("upperBound", expression.UpperBound);
_xmlWriter.WriteEndElement();
return(expression);
}
public override ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
// First visit all expressions
base.VisitBetweenExpression(expression);
// Since a BETWEEN expression can be expressed using an AND expression and two
// <= binary operator nodes we convert them to simplify the join and optimization engine.
BinaryExpression lowerBound = new BinaryExpression(BinaryOperator.LessOrEqual, expression.LowerBound, expression.Expression);
BinaryExpression upperBound = new BinaryExpression(BinaryOperator.LessOrEqual, expression.Expression, expression.UpperBound);
BinaryExpression and = new BinaryExpression(BinaryOperator.LogicalAnd, lowerBound, upperBound);
// Make sure we also resolve the result.
return(VisitExpression(and));
}
public override ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
Visit(expression.Expression);
_writer.Write(" BETWEEN ");
// Emit lower bound
bool parenthesesNedded = expression.LowerBound is BinaryExpression;
if (parenthesesNedded)
{
_writer.Write("(");
}
Visit(expression.LowerBound);
if (parenthesesNedded)
{
_writer.Write(")");
}
// Emit and
_writer.Write(" AND ");
// Emit upper bound
parenthesesNedded = expression.UpperBound is BinaryExpression;
if (parenthesesNedded)
{
_writer.Write("(");
}
Visit(expression.UpperBound);
if (parenthesesNedded)
{
_writer.Write(")");
}
return(expression);
}
private static bool VisitBetweenExpression(BetweenExpression node1, BetweenExpression node2)
{
return node2 != null &&
Visit(node1.Expression, node2.Expression) &&
Visit(node1.LowerBound, node2.LowerBound) &&
Visit(node1.UpperBound, node2.UpperBound);
}
public override ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
Visit(expression.Expression);
_writer.Write(" BETWEEN ");
// Emit lower bound
bool parenthesesNedded = expression.LowerBound is BinaryExpression;
if (parenthesesNedded)
_writer.Write("(");
Visit(expression.LowerBound);
if (parenthesesNedded)
_writer.Write(")");
// Emit and
_writer.Write(" AND ");
// Emit upper bound
parenthesesNedded = expression.UpperBound is BinaryExpression;
if (parenthesesNedded)
_writer.Write("(");
Visit(expression.UpperBound);
if (parenthesesNedded)
_writer.Write(")");
return expression;
}
private ExpressionNode ParseSubExpression(ExpressionNode left, int precedence)
{
if (left == null)
{
// No left operand, so we parse one and take care about leading unary operators
if (_token.Info.UnaryOperator != null)
{
UnaryOperator op = _token.Info.UnaryOperator;
NextToken();
ExpressionNode expr = ParseSubExpression(null, op.Precedence);
left = new UnaryExpression(op, expr);
}
else
{
left = ParseSimpleExpression();
}
}
while (_token.Id != TokenId.Eof)
{
// Special handling for NOT BETWEEN, NOT IN, NOT LIKE, NOT SIMILAR TO, and NOT SOUNDSLIKE.
bool negated = false;
if (_token.Id == TokenId.NOT)
{
if (_lookahead.Id == TokenId.BETWEEN ||
_lookahead.Id == TokenId.IN ||
_lookahead.Id == TokenId.LIKE ||
_lookahead.Id == TokenId.SIMILAR ||
_lookahead.Id == TokenId.SOUNDSLIKE)
{
NextToken();
negated = true;
}
}
// Special handling for the only ternary operator BETWEEN
if (_token.Id == TokenId.BETWEEN)
{
NextToken();
ExpressionNode lowerBound = ParseSubExpression(null, Operator.BETWEEN_PRECEDENCE);
Match(TokenId.AND);
ExpressionNode upperBound = ParseSubExpression(null, Operator.BETWEEN_PRECEDENCE);
left = new BetweenExpression(left, lowerBound, upperBound);
}
else
{
// If there is no binary operator we are finished
if (_token.Info.BinaryOperator == null)
break;
BinaryOperator binaryOp = _token.Info.BinaryOperator;
// Precedence is lower, parse it later
if (binaryOp.Precedence < precedence)
break;
// Precedence is equal, but operator ist not right associative, parse it later
if (binaryOp.Precedence == precedence && !binaryOp.IsRightAssociative)
break;
// Precedence is higher
NextToken();
// Special handling for SIMILAR TO
if (binaryOp == BinaryOperator.SimilarTo)
Match(TokenId.TO);
if (binaryOp == BinaryOperator.In)
{
// Special handling for IN
InExpression inExpression = new InExpression();
inExpression.Left = left;
inExpression.RightExpressions = ParseSimpleQueryExpressionList();
left = inExpression;
}
else if (_token.Id == TokenId.ANY || _token.Id == TokenId.SOME || _token.Id == TokenId.ALL)
{
// Special handling for ANY (SOME) and ALL
if (binaryOp != BinaryOperator.Equal &&
binaryOp != BinaryOperator.NotEqual &&
binaryOp != BinaryOperator.Less &&
binaryOp != BinaryOperator.LessOrEqual &&
binaryOp != BinaryOperator.Greater &&
binaryOp != BinaryOperator.GreaterOrEqual)
{
_errorReporter.InvalidOperatorForAllAny(_token.Range, binaryOp);
}
AllAnySubselect allAnySubselect = new AllAnySubselect();
allAnySubselect.Left = left;
allAnySubselect.Op = binaryOp;
allAnySubselect.Type = (_token.Id == TokenId.ALL) ? AllAnySubselect.AllAnyType.All : AllAnySubselect.AllAnyType.Any;
NextToken();
Match(TokenId.LeftParentheses);
allAnySubselect.Query = ParseQuery();
Match(TokenId.RightParentheses);
left = allAnySubselect;
}
else
{
left = new BinaryExpression(binaryOp, left, ParseSubExpression(null, binaryOp.Precedence));
}
}
// Special handling for negated expressions (see above)
if (negated)
left = new UnaryExpression(UnaryOperator.LogicalNot, left);
}
return left;
}
public override ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
// First visit all expressions
base.VisitBetweenExpression(expression);
// Since a BETWEEN expression can be expressed using an AND expression and two
// <= binary operator nodes we convert them to simplify the join and optimization engine.
BinaryExpression lowerBound = new BinaryExpression(BinaryOperator.LessOrEqual, expression.LowerBound, expression.Expression);
BinaryExpression upperBound = new BinaryExpression(BinaryOperator.LessOrEqual, expression.Expression, expression.UpperBound);
BinaryExpression and = new BinaryExpression(BinaryOperator.LogicalAnd, lowerBound, upperBound);
// Make sure we also resolve the result.
return VisitExpression(and);
}
public virtual ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
expression.Expression = VisitExpression(expression.Expression);
expression.LowerBound = VisitExpression(expression.LowerBound);
expression.UpperBound = VisitExpression(expression.UpperBound);
return expression;
}
private ExpressionNode ParseSubExpression(ExpressionNode left, int precedence)
{
if (left == null)
{
// No left operand, so we parse one and take care about leading unary operators
if (_token.Info.UnaryOperator != null)
{
UnaryOperator op = _token.Info.UnaryOperator;
NextToken();
ExpressionNode expr = ParseSubExpression(null, op.Precedence);
left = new UnaryExpression(op, expr);
}
else
{
left = ParseSimpleExpression();
}
}
while (_token.Id != TokenId.Eof)
{
// Special handling for NOT BETWEEN, NOT IN, NOT LIKE, NOT SIMILAR TO, and NOT SOUNDSLIKE.
bool negated = false;
if (_token.Id == TokenId.NOT)
{
if (_lookahead.Id == TokenId.BETWEEN ||
_lookahead.Id == TokenId.IN ||
_lookahead.Id == TokenId.LIKE ||
_lookahead.Id == TokenId.SIMILAR ||
_lookahead.Id == TokenId.SOUNDSLIKE)
{
NextToken();
negated = true;
}
}
// Special handling for the only ternary operator BETWEEN
if (_token.Id == TokenId.BETWEEN)
{
NextToken();
ExpressionNode lowerBound = ParseSubExpression(null, Operator.BETWEEN_PRECEDENCE);
Match(TokenId.AND);
ExpressionNode upperBound = ParseSubExpression(null, Operator.BETWEEN_PRECEDENCE);
left = new BetweenExpression(left, lowerBound, upperBound);
}
else
{
// If there is no binary operator we are finished
if (_token.Info.BinaryOperator == null)
{
break;
}
BinaryOperator binaryOp = _token.Info.BinaryOperator;
// Precedence is lower, parse it later
if (binaryOp.Precedence < precedence)
{
break;
}
// Precedence is equal, but operator ist not right associative, parse it later
if (binaryOp.Precedence == precedence && !binaryOp.IsRightAssociative)
{
break;
}
// Precedence is higher
NextToken();
// Special handling for SIMILAR TO
if (binaryOp == BinaryOperator.SimilarTo)
{
Match(TokenId.TO);
}
if (binaryOp == BinaryOperator.In)
{
// Special handling for IN
InExpression inExpression = new InExpression();
inExpression.Left = left;
inExpression.RightExpressions = ParseSimpleQueryExpressionList();
left = inExpression;
}
else if (_token.Id == TokenId.ANY || _token.Id == TokenId.SOME || _token.Id == TokenId.ALL)
{
// Special handling for ANY (SOME) and ALL
if (binaryOp != BinaryOperator.Equal &&
binaryOp != BinaryOperator.NotEqual &&
binaryOp != BinaryOperator.Less &&
binaryOp != BinaryOperator.LessOrEqual &&
binaryOp != BinaryOperator.Greater &&
binaryOp != BinaryOperator.GreaterOrEqual)
{
_errorReporter.InvalidOperatorForAllAny(_token.Range, binaryOp);
}
AllAnySubselect allAnySubselect = new AllAnySubselect();
allAnySubselect.Left = left;
allAnySubselect.Op = binaryOp;
allAnySubselect.Type = (_token.Id == TokenId.ALL) ? AllAnySubselect.AllAnyType.All : AllAnySubselect.AllAnyType.Any;
NextToken();
Match(TokenId.LeftParentheses);
allAnySubselect.Query = ParseQuery();
Match(TokenId.RightParentheses);
left = allAnySubselect;
}
else
{
left = new BinaryExpression(binaryOp, left, ParseSubExpression(null, binaryOp.Precedence));
}
}
// Special handling for negated expressions (see above)
if (negated)
{
left = new UnaryExpression(UnaryOperator.LogicalNot, left);
}
}
return(left);
}
public override ExpressionNode VisitBetweenExpression(BetweenExpression expression)
{
_xmlWriter.WriteStartElement("betweenExpression");
WriteTypeAttribute(expression.ExpressionType);
WriteAstNode("lowerBound", expression.LowerBound);
WriteAstNode("upperBound", expression.UpperBound);
_xmlWriter.WriteEndElement();
return expression;
}