public void PushBinary(BinaryOperator binaryOperator)
{
ExpressionNode rightExpressionNode = _expressionStack.Pop();
ExpressionNode leftExpressionNode = _expressionStack.Pop();
BinaryExpression binaryExpression = new BinaryExpression(binaryOperator, leftExpressionNode, rightExpressionNode);
_expressionStack.Push(binaryExpression);
}
public PartExtractor(LogicalOperator logicalOperator)
{
if (logicalOperator == LogicalOperator.And)
_operatorToBreakAt = BinaryOperator.LogicalAnd;
else
_operatorToBreakAt = BinaryOperator.LogicalOr;
}
public static BinaryOperator NegateBinaryOp(BinaryOperator op)
{
if (op == BinaryOperator.LogicalAnd)
return BinaryOperator.LogicalOr;
if (op == BinaryOperator.LogicalOr)
return BinaryOperator.LogicalAnd;
if (op == BinaryOperator.Equal)
return BinaryOperator.NotEqual;
if (op == BinaryOperator.NotEqual)
return BinaryOperator.Equal;
if (op == BinaryOperator.Greater)
return BinaryOperator.LessOrEqual;
if (op == BinaryOperator.GreaterOrEqual)
return BinaryOperator.Less;
if (op == BinaryOperator.Less)
return BinaryOperator.GreaterOrEqual;
if (op == BinaryOperator.LessOrEqual)
return BinaryOperator.Greater;
return null;
}
private static void Add(TokenId tokenId, string text, bool isKeyword, bool isQueryKeyword, UnaryOperator unOp, BinaryOperator binOp)
{
TokenInfo info = new TokenInfo(tokenId, text, isKeyword, isQueryKeyword, unOp, binOp);
_infosById.Add(tokenId, info);
if (text != null)
_infosByText.Add(text, info);
}
private TokenInfo(TokenId tokenId, string text, bool isKeyword, bool isQueryKeyword, UnaryOperator unOp, BinaryOperator binOp)
{
_tokenId = tokenId;
_text = text;
_isKeyword = isKeyword;
_isQueryKeyword = isQueryKeyword;
_unaryOperator = unOp;
_binaryOperator = binOp;
}
void IErrorReporter.InvalidOperatorForAllAny(SourceRange sourceRange, BinaryOperator foundOp)
{
string message = String.Format(CultureInfo.CurrentCulture, Resources.InvalidOperatorForAllAny, foundOp.TokenText);
HandleError(sourceRange, ErrorId.InvalidOperatorForAllAny, message);
}
void IErrorReporter.CannotApplyOperator(BinaryOperator op, Type leftType, Type rightType)
{
string message = String.Format(
CultureInfo.CurrentCulture,
Resources.CannotApplyBinaryOp,
op.TokenText,
FormattingHelpers.FormatType(leftType),
FormattingHelpers.FormatType(rightType)
);
HandleError(ErrorId.CannotApplyBinaryOperator, message);
}
void IErrorReporter.AmbiguousOperatorOverloading(BinaryOperator op, Type leftType, Type rightType)
{
string message = String.Format(
CultureInfo.CurrentCulture,
Resources.AmbiguousOperatorOverloading,
op.TokenText,
FormattingHelpers.FormatType(leftType),
FormattingHelpers.FormatType(rightType)
);
HandleError(ErrorId.AmbiguousOperatorOverloading, message);
}
void IErrorReporter.AmbiguousOperator(BinaryOperator op, Type leftType, Type rightType, MethodInfo opMethod1, MethodInfo opMethod2)
{
string message = String.Format(
CultureInfo.CurrentCulture,
Resources.AmbiguousBinaryOperator,
op.TokenText,
FormattingHelpers.FormatType(leftType),
FormattingHelpers.FormatType(rightType),
FormattingHelpers.FormatMethodInfo(opMethod1),
FormattingHelpers.FormatMethodInfo(opMethod2)
);
HandleError(ErrorId.AmbiguousBinaryOperator, message);
}
public static RuntimeException BinaryOperatorFailed(BinaryOperator binaryOperator, MethodInfo operatorMethod, Type leftOperandType, Type rightOperandType, object left, object right, Exception exception)
{
if (binaryOperator == null)
throw new ArgumentNullException("binaryOperator");
if (operatorMethod == null)
throw new ArgumentNullException("operatorMethod");
if (leftOperandType == null)
throw new ArgumentNullException("leftOperandType");
if (rightOperandType == null)
throw new ArgumentNullException("rightOperandType");
if (exception == null)
throw new ArgumentNullException("exception");
string message = String.Format(
CultureInfo.CurrentCulture,
Resources.BinaryOperatorFailed,
FormattingHelpers.FormatType(leftOperandType),
binaryOperator.TokenText,
FormattingHelpers.FormatType(rightOperandType),
FormattingHelpers.FormatMethodInfo(operatorMethod),
left,
right,
exception.Message,
Environment.NewLine
);
return new RuntimeException(message, exception);
}
public BinaryExpression(BinaryOperator op, ExpressionNode left, ExpressionNode right)
{
_op = op;
_left = left;
_right = right;
}
public MethodInfo BindOperator(BinaryOperator op, Type leftOperandType, Type rightOperandType)
{
if (leftOperandType == typeof(DBNull) || rightOperandType == typeof(DBNull))
return _binaryOperatorPlaceholder;
MethodInfo result;
try
{
List<MethodInfo> methodList = new List<MethodInfo>();
// Get the operator method from left...
methodList.AddRange(OperatorMethodCache.GetOperatorMethods(leftOperandType, op));
if (leftOperandType != rightOperandType)
{
List<Type> declaringTypes = new List<Type>();
foreach (MethodInfo info in methodList)
{
if (!declaringTypes.Contains(info.DeclaringType))
declaringTypes.Add(info.DeclaringType);
}
foreach (MethodInfo rightOperatorMethod in OperatorMethodCache.GetOperatorMethods(rightOperandType, op))
{
if (!declaringTypes.Contains(rightOperatorMethod.DeclaringType))
methodList.Add(rightOperatorMethod);
}
}
// ...from the builtin ones.
methodList.AddRange(OperatorMethodCache.GetOperatorMethods(typeof(BuiltInOperators), op));
// Perform overload resolution.
MethodInfo[] methods = methodList.ToArray();
result = BindMethodInfo(methods, new Type[] {leftOperandType, rightOperandType});
}
catch (InvocationIsAmbiguousException ex)
{
_errorReporter.AmbiguousOperator(op, leftOperandType, rightOperandType, ex.Method1, ex.Method2);
// Avoid cascading errors
result = ex.Method1;
}
// Due to the lack of generic operator methods we have to manually some rules here.
//
// 1. = and <>. There exists an operator method op_X(object, object) that would allow
// comparing any type to any other type. This is not correct. We want to enforce
// that both type are compatible (or if any operand is an interface).
// 2. & and | for enums. There exists an operator method op_X(Enum, Enum) that would allow
// combining any enum with any other enum. This is not correct. We want to enforce
// that both enums are the same.
if (result == _generalEqualityOperator || result == _generalInequalityOperator)
{
if (!leftOperandType.IsAssignableFrom(rightOperandType) &&
!rightOperandType.IsAssignableFrom(leftOperandType) &&
!leftOperandType.IsInterface &&
!rightOperandType.IsInterface)
return null;
}
else if (result == _enumBitAndOperator || result == _enumBitOrOperator)
{
if (leftOperandType != rightOperandType)
return null;
}
return result;
}
private static JoinOperator JoinOperatorFromBinaryOperator(BinaryOperator op)
{
// TODO: Uncomment the following lines if we can create optimized nodes
// for other joins than equijoin.
if (op == BinaryOperator.Equal)
return JoinOperator.Equal;
// else if (expression.Op == BinaryOperator.Less)
// return JoinOperator.Less;
// else if (expression.Op == BinaryOperator.LessOrEqual)
// return JoinOperator.LessOrEqual;
// else if (expression.Op == BinaryOperator.Greater)
// return JoinOperator.Greater;
// else if (expression.Op == BinaryOperator.GreaterOrEqual)
// return JoinOperator.GreaterOrEqual;
else
return JoinOperator.None;
}
public override ExpressionNode VisitUnaryExpression(UnaryExpression expression)
{
// First visit arguments
base.VisitUnaryExpression(expression);
if (expression.Op == UnaryOperator.LogicalNot)
{
// Replace "NOT NOT expr" by "expr"
UnaryExpression unOp = expression.Operand as UnaryExpression;
if (unOp != null)
{
if (unOp.Op == UnaryOperator.LogicalNot)
{
return(VisitExpression(unOp.Operand));
}
}
// Replace "NOT expr IS NULL" and "NOT expr IS NOT NULL" by
// "expr IS NOT NULL" and "expr IS NULL" resp.
IsNullExpression isNull = expression.Operand as IsNullExpression;
if (isNull != null)
{
isNull.Negated = !isNull.Negated;
return(VisitExpression(isNull));
}
// Apply negation on EXISTS
ExistsSubselect existsSubselect = expression.Operand as ExistsSubselect;
if (existsSubselect != null)
{
existsSubselect.Negated = !existsSubselect.Negated;
return(existsSubselect);
}
// Apply negation on ALL/ANY subquery
AllAnySubselect allAnySubselect = expression.Operand as AllAnySubselect;
if (allAnySubselect != null)
{
allAnySubselect.Op = AstUtil.NegateBinaryOp(allAnySubselect.Op);
allAnySubselect.Type = (allAnySubselect.Type == AllAnySubselect.AllAnyType.All) ? AllAnySubselect.AllAnyType.Any : AllAnySubselect.AllAnyType.All;
return(allAnySubselect);
}
// Apply De Morgan's law
BinaryExpression binOp = expression.Operand as BinaryExpression;
if (binOp != null)
{
BinaryOperator negatedOp = AstUtil.NegateBinaryOp(binOp.Op);
if (negatedOp != null)
{
ExpressionNode newLeft;
ExpressionNode newRight;
if (binOp.Op == BinaryOperator.LogicalAnd || binOp.Op == BinaryOperator.LogicalOr)
{
newLeft = new UnaryExpression(expression.Op, binOp.Left);
newRight = new UnaryExpression(expression.Op, binOp.Right);
}
else
{
newLeft = binOp.Left;
newRight = binOp.Right;
}
binOp.Op = negatedOp;
binOp.Left = newLeft;
binOp.Right = newRight;
return(VisitExpression(binOp));
}
}
}
return(expression);
}