private Expression CreateCompareExpression(Expression left, Expression right)
{
Expression index = (Expression)Expression.Condition((Expression)LinqExpressionNormalizer.CreateRelationalOperator(ExpressionType.Equal, left, right), (Expression)Expression.Constant((object)0), (Expression)Expression.Condition((Expression)LinqExpressionNormalizer.CreateRelationalOperator(ExpressionType.GreaterThan, left, right), (Expression)Expression.Constant((object)1), (Expression)Expression.Constant((object)-1)));
this._patterns[index] = (LinqExpressionNormalizer.Pattern) new LinqExpressionNormalizer.ComparePattern(left, right);
return(index);
}
private static bool TryMatchCoalescePattern(Expression expression, out Expression normalized)
{
normalized = (Expression)null;
bool flag = false;
if (expression.NodeType == ExpressionType.Quote)
{
if (LinqExpressionNormalizer.TryMatchCoalescePattern(((UnaryExpression)expression).Operand, out normalized))
{
flag = true;
normalized = (Expression)Expression.Quote(normalized);
}
}
else if (expression.NodeType == ExpressionType.Lambda)
{
LambdaExpression lambdaExpression = (LambdaExpression)expression;
if (lambdaExpression.Body.NodeType == ExpressionType.Coalesce && lambdaExpression.Body.Type == typeof(bool))
{
BinaryExpression body = (BinaryExpression)lambdaExpression.Body;
if (body.Right.NodeType == ExpressionType.Constant && false.Equals(((ConstantExpression)body.Right).Value))
{
normalized = (Expression)Expression.Lambda(lambdaExpression.Type, (Expression)Expression.Convert(body.Left, typeof(bool)), (IEnumerable <ParameterExpression>)lambdaExpression.Parameters);
flag = true;
}
}
}
return(flag);
}
private static BinaryExpression CreateRelationalOperator(
ExpressionType op,
Expression left,
Expression right)
{
BinaryExpression result;
LinqExpressionNormalizer.TryCreateRelationalOperator(op, left, right, out result);
return(result);
}
private static MethodCallExpression NormalizePredicateArgument(
MethodCallExpression callExpression)
{
int argumentOrdinal;
Expression normalized;
MethodCallExpression methodCallExpression;
if (LinqExpressionNormalizer.HasPredicateArgument(callExpression, out argumentOrdinal) && LinqExpressionNormalizer.TryMatchCoalescePattern(callExpression.Arguments[argumentOrdinal], out normalized))
{
methodCallExpression = Expression.Call(callExpression.Object, callExpression.Method, (IEnumerable <Expression>) new List <Expression>((IEnumerable <Expression>)callExpression.Arguments)
{
[argumentOrdinal] = normalized
});
}
else
{
methodCallExpression = callExpression;
}
return(methodCallExpression);
}
internal override Expression VisitBinary(BinaryExpression b)
{
b = (BinaryExpression)base.VisitBinary(b);
if (b.NodeType == ExpressionType.Equal)
{
Expression left = LinqExpressionNormalizer.UnwrapObjectConvert(b.Left);
Expression right = LinqExpressionNormalizer.UnwrapObjectConvert(b.Right);
if (left != b.Left || right != b.Right)
{
b = LinqExpressionNormalizer.CreateRelationalOperator(ExpressionType.Equal, left, right);
}
}
LinqExpressionNormalizer.Pattern pattern;
if (this._patterns.TryGetValue(b.Left, out pattern) && pattern.Kind == LinqExpressionNormalizer.PatternKind.Compare && LinqExpressionNormalizer.IsConstantZero(b.Right))
{
LinqExpressionNormalizer.ComparePattern comparePattern = (LinqExpressionNormalizer.ComparePattern)pattern;
BinaryExpression result;
if (LinqExpressionNormalizer.TryCreateRelationalOperator(b.NodeType, comparePattern.Left, comparePattern.Right, out result))
{
b = result;
}
}
return((Expression)b);
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
m = (MethodCallExpression)base.VisitMethodCall(m);
if (m.Method.IsStatic)
{
if (m.Method.Name.StartsWith("op_", StringComparison.Ordinal))
{
if (m.Arguments.Count == 2)
{
switch (m.Method.Name)
{
case "op_Equality":
return((Expression)Expression.Equal(m.Arguments[0], m.Arguments[1], false, m.Method));
case "op_Inequality":
return((Expression)Expression.NotEqual(m.Arguments[0], m.Arguments[1], false, m.Method));
case "op_GreaterThan":
return((Expression)Expression.GreaterThan(m.Arguments[0], m.Arguments[1], false, m.Method));
case "op_GreaterThanOrEqual":
return((Expression)Expression.GreaterThanOrEqual(m.Arguments[0], m.Arguments[1], false, m.Method));
case "op_LessThan":
return((Expression)Expression.LessThan(m.Arguments[0], m.Arguments[1], false, m.Method));
case "op_LessThanOrEqual":
return((Expression)Expression.LessThanOrEqual(m.Arguments[0], m.Arguments[1], false, m.Method));
case "op_Multiply":
return((Expression)Expression.Multiply(m.Arguments[0], m.Arguments[1], m.Method));
case "op_Subtraction":
return((Expression)Expression.Subtract(m.Arguments[0], m.Arguments[1], m.Method));
case "op_Addition":
return((Expression)Expression.Add(m.Arguments[0], m.Arguments[1], m.Method));
case "op_Division":
return((Expression)Expression.Divide(m.Arguments[0], m.Arguments[1], m.Method));
case "op_Modulus":
return((Expression)Expression.Modulo(m.Arguments[0], m.Arguments[1], m.Method));
case "op_BitwiseAnd":
return((Expression)Expression.And(m.Arguments[0], m.Arguments[1], m.Method));
case "op_BitwiseOr":
return((Expression)Expression.Or(m.Arguments[0], m.Arguments[1], m.Method));
case "op_ExclusiveOr":
return((Expression)Expression.ExclusiveOr(m.Arguments[0], m.Arguments[1], m.Method));
}
}
if (m.Arguments.Count == 1)
{
switch (m.Method.Name)
{
case "op_UnaryNegation":
return((Expression)Expression.Negate(m.Arguments[0], m.Method));
case "op_UnaryPlus":
return((Expression)Expression.UnaryPlus(m.Arguments[0], m.Method));
case "op_Explicit":
case "op_Implicit":
return((Expression)Expression.Convert(m.Arguments[0], m.Type, m.Method));
case "op_OnesComplement":
case "op_False":
return((Expression)Expression.Not(m.Arguments[0], m.Method));
}
}
}
if (m.Method.Name == "Equals" && m.Arguments.Count > 1)
{
return((Expression)Expression.Equal(m.Arguments[0], m.Arguments[1], false, m.Method));
}
if (m.Method.Name == "CompareString" && m.Method.DeclaringType.FullName == "Microsoft.VisualBasic.CompilerServices.Operators" || m.Method.Name == "Compare" && m.Arguments.Count > 1 && m.Method.ReturnType == typeof(int))
{
return(this.CreateCompareExpression(m.Arguments[0], m.Arguments[1]));
}
}
else
{
if (m.Method.Name == "Equals" && m.Arguments.Count > 0)
{
Type parameterType = m.Method.GetParameters()[0].ParameterType;
if (parameterType != typeof(DbGeography) && parameterType != typeof(DbGeometry))
{
return((Expression)LinqExpressionNormalizer.CreateRelationalOperator(ExpressionType.Equal, m.Object, m.Arguments[0]));
}
}
if (m.Method.Name == "CompareTo" && m.Arguments.Count == 1 && m.Method.ReturnType == typeof(int))
{
return(this.CreateCompareExpression(m.Object, m.Arguments[0]));
}
if (m.Method.Name == "Contains" && m.Arguments.Count == 1)
{
Type declaringType = m.Method.DeclaringType;
MethodInfo method;
if (declaringType.IsGenericType() && declaringType.GetGenericTypeDefinition() == typeof(List <>) && ReflectionUtil.TryLookupMethod(SequenceMethod.Contains, out method))
{
return((Expression)Expression.Call(method.MakeGenericMethod(declaringType.GetGenericArguments()), m.Object, m.Arguments[0]));
}
}
}
return((Expression)LinqExpressionNormalizer.NormalizePredicateArgument(m));
}
