Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Ast / UnaryExpression.cs / 1305376 / UnaryExpression.cs
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*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
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* ***************************************************************************/
using System.Diagnostics;
using System.Dynamic.Utils;
using System.Reflection;
using System.Runtime.CompilerServices;
#if SILVERLIGHT
using System.Core;
#endif
namespace System.Linq.Expressions {
///
/// Represents an expression that has a unary operator.
///
#if !SILVERLIGHT
[DebuggerTypeProxy(typeof(Expression.UnaryExpressionProxy))]
#endif
public sealed class UnaryExpression : Expression {
private readonly Expression _operand;
private readonly MethodInfo _method;
private readonly ExpressionType _nodeType;
private readonly Type _type;
internal UnaryExpression(ExpressionType nodeType, Expression expression, Type type, MethodInfo method) {
_operand = expression;
_method = method;
_nodeType = nodeType;
_type = type;
}
///
/// Gets the static type of the expression that this
/// The
public sealed override Type Type {
get { return _type; }
}
///
/// Returns the node type of this
/// The
public sealed override ExpressionType NodeType {
get { return _nodeType; }
}
///
/// Gets the operand of the unary operation.
///
/// An
public Expression Operand {
get { return _operand; }
}
///
/// Gets the implementing method for the unary operation.
///
/// The
public MethodInfo Method {
get { return _method; }
}
///
/// Gets a value that indicates whether the expression tree node represents a lifted call to an operator.
///
/// true if the node represents a lifted call; otherwise, false.
public bool IsLifted {
get {
if (NodeType == ExpressionType.TypeAs || NodeType == ExpressionType.Quote || NodeType == ExpressionType.Throw) {
return false;
}
bool operandIsNullable = TypeUtils.IsNullableType(_operand.Type);
bool resultIsNullable = TypeUtils.IsNullableType(this.Type);
if (_method != null) {
return (operandIsNullable && !TypeUtils.AreEquivalent(_method.GetParametersCached()[0].ParameterType, _operand.Type)) ||
(resultIsNullable && !TypeUtils.AreEquivalent(_method.ReturnType, this.Type));
}
return operandIsNullable || resultIsNullable;
}
}
///
/// Gets a value that indicates whether the expression tree node represents a lifted call to an operator whose return type is lifted to a nullable type.
///
/// true if the operator's return type is lifted to a nullable type; otherwise, false.
public bool IsLiftedToNull {
get {
return IsLifted && TypeUtils.IsNullableType(this.Type);
}
}
///
/// Dispatches to the specific visit method for this node type.
///
protected internal override Expression Accept(ExpressionVisitor visitor) {
return visitor.VisitUnary(this);
}
///
/// Gets a value that indicates whether the expression tree node can be reduced.
///
public override bool CanReduce {
get {
switch (_nodeType) {
case ExpressionType.PreIncrementAssign:
case ExpressionType.PreDecrementAssign:
case ExpressionType.PostIncrementAssign:
case ExpressionType.PostDecrementAssign:
return true;
}
return false;
}
}
///
/// Reduces the expression node to a simpler expression.
/// If CanReduce returns true, this should return a valid expression.
/// This method is allowed to return another node which itself
/// must be reduced.
///
/// The reduced expression.
public override Expression Reduce() {
if (CanReduce) {
switch (_operand.NodeType) {
case ExpressionType.Index:
return ReduceIndex();
case ExpressionType.MemberAccess:
return ReduceMember();
default:
return ReduceVariable();
}
}
return this;
}
private bool IsPrefix {
get { return _nodeType == ExpressionType.PreIncrementAssign || _nodeType == ExpressionType.PreDecrementAssign; }
}
private UnaryExpression FunctionalOp(Expression operand) {
ExpressionType functional;
if (_nodeType == ExpressionType.PreIncrementAssign || _nodeType == ExpressionType.PostIncrementAssign) {
functional = ExpressionType.Increment;
} else {
functional = ExpressionType.Decrement;
}
return new UnaryExpression(functional, operand, operand.Type, _method);
}
private Expression ReduceVariable() {
if (IsPrefix) {
// (op) var
// ... is reduced into ...
// var = op(var)
return Assign(_operand, FunctionalOp(_operand));
}
// var (op)
// ... is reduced into ...
// temp = var
// var = op(var)
// temp
var temp = Parameter(_operand.Type, null);
return Block(
new[] { temp },
Assign(temp, _operand),
Assign(_operand, FunctionalOp(temp)),
temp
);
}
private Expression ReduceMember() {
var member = (MemberExpression)_operand;
if (member.Expression == null) {
//static member, reduce the same as variable
return ReduceVariable();
} else {
var temp1 = Parameter(member.Expression.Type, null);
var initTemp1 = Assign(temp1, member.Expression);
member = MakeMemberAccess(temp1, member.Member);
if (IsPrefix) {
// (op) value.member
// ... is reduced into ...
// temp1 = value
// temp1.member = op(temp1.member)
return Block(
new[] { temp1 },
initTemp1,
Assign(member, FunctionalOp(member))
);
}
// value.member (op)
// ... is reduced into ...
// temp1 = value
// temp2 = temp1.member
// temp1.member = op(temp2)
// temp2
var temp2 = Parameter(member.Type, null);
return Block(
new[] { temp1, temp2 },
initTemp1,
Assign(temp2, member),
Assign(member, FunctionalOp(temp2)),
temp2
);
}
}
private Expression ReduceIndex() {
// left[a0, a1, ... aN] (op)
//
// ... is reduced into ...
//
// tempObj = left
// tempArg0 = a0
// ...
// tempArgN = aN
// tempValue = tempObj[tempArg0, ... tempArgN]
// tempObj[tempArg0, ... tempArgN] = op(tempValue)
// tempValue
bool prefix = IsPrefix;
var index = (IndexExpression)_operand;
int count = index.Arguments.Count;
var block = new Expression[count + (prefix ? 2 : 4)];
var temps = new ParameterExpression[count + (prefix ? 1 : 2)];
var args = new ParameterExpression[count];
int i = 0;
temps[i] = Parameter(index.Object.Type, null);
block[i] = Assign(temps[i], index.Object);
i++;
while (i <= count) {
var arg = index.Arguments[i - 1];
args[i - 1] = temps[i] = Parameter(arg.Type, null);
block[i] = Assign(temps[i], arg);
i++;
}
index = MakeIndex(temps[0], index.Indexer, new TrueReadOnlyCollection(args));
if (!prefix) {
var lastTemp = temps[i] = Parameter(index.Type, null);
block[i] = Assign(temps[i], index);
i++;
Debug.Assert(i == temps.Length);
block[i++] = Assign(index, FunctionalOp(lastTemp));
block[i++] = lastTemp;
} else {
Debug.Assert(i == temps.Length);
block[i++] = Assign(index, FunctionalOp(index));
}
Debug.Assert(i == block.Length);
return Block(new TrueReadOnlyCollection(temps), new TrueReadOnlyCollection(block));
}
///
/// Creates a new expression that is like this one, but using the
/// supplied children. If all of the children are the same, it will
/// return this expression.
///
/// The This expression if no children changed, or an expression with the updated children.
public UnaryExpression Update(Expression operand) {
if (operand == Operand) {
return this;
}
return Expression.MakeUnary(NodeType, operand, Type, Method);
}
}
public partial class Expression {
///
/// Creates a
/// The The
/// Thrown when
/// Thrown when
public static UnaryExpression MakeUnary(ExpressionType unaryType, Expression operand, Type type) {
return MakeUnary(unaryType, operand, type, null);
}
///
/// Creates a
/// The The
/// Thrown when
/// Thrown when
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]
public static UnaryExpression MakeUnary(ExpressionType unaryType, Expression operand, Type type, MethodInfo method) {
switch (unaryType) {
case ExpressionType.Negate:
return Negate(operand, method);
case ExpressionType.NegateChecked:
return NegateChecked(operand, method);
case ExpressionType.Not:
return Not(operand, method);
case ExpressionType.IsFalse:
return IsFalse(operand, method);
case ExpressionType.IsTrue:
return IsTrue(operand, method);
case ExpressionType.OnesComplement:
return OnesComplement(operand, method);
case ExpressionType.ArrayLength:
return ArrayLength(operand);
case ExpressionType.Convert:
return Convert(operand, type, method);
case ExpressionType.ConvertChecked:
return ConvertChecked(operand, type, method);
case ExpressionType.Throw:
return Throw(operand, type);
case ExpressionType.TypeAs:
return TypeAs(operand, type);
case ExpressionType.Quote:
return Quote(operand);
case ExpressionType.UnaryPlus:
return UnaryPlus(operand, method);
case ExpressionType.Unbox:
return Unbox(operand, type);
case ExpressionType.Increment:
return Increment(operand, method);
case ExpressionType.Decrement:
return Decrement(operand, method);
case ExpressionType.PreIncrementAssign:
return PreIncrementAssign(operand, method);
case ExpressionType.PostIncrementAssign:
return PostIncrementAssign(operand, method);
case ExpressionType.PreDecrementAssign:
return PreDecrementAssign(operand, method);
case ExpressionType.PostDecrementAssign:
return PostDecrementAssign(operand, method);
default:
throw Error.UnhandledUnary(unaryType);
}
}
private static UnaryExpression GetUserDefinedUnaryOperatorOrThrow(ExpressionType unaryType, string name, Expression operand) {
UnaryExpression u = GetUserDefinedUnaryOperator(unaryType, name, operand);
if (u != null) {
ValidateParamswithOperandsOrThrow(u.Method.GetParametersCached()[0].ParameterType, operand.Type, unaryType, name);
return u;
}
throw Error.UnaryOperatorNotDefined(unaryType, operand.Type);
}
private static UnaryExpression GetUserDefinedUnaryOperator(ExpressionType unaryType, string name, Expression operand) {
Type operandType = operand.Type;
Type[] types = new Type[] { operandType };
Type nnOperandType = TypeUtils.GetNonNullableType(operandType);
BindingFlags flags = BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;
MethodInfo method = nnOperandType.GetMethodValidated(name, flags, null, types, null);
if (method != null) {
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// try lifted call
if (TypeUtils.IsNullableType(operandType)) {
types[0] = nnOperandType;
method = nnOperandType.GetMethodValidated(name, flags, null, types, null);
if (method != null && method.ReturnType.IsValueType && !TypeUtils.IsNullableType(method.ReturnType)) {
return new UnaryExpression(unaryType, operand, TypeUtils.GetNullableType(method.ReturnType), method);
}
}
return null;
}
private static UnaryExpression GetMethodBasedUnaryOperator(ExpressionType unaryType, Expression operand, MethodInfo method) {
System.Diagnostics.Debug.Assert(method != null);
ValidateOperator(method);
ParameterInfo[] pms = method.GetParametersCached();
if (pms.Length != 1)
throw Error.IncorrectNumberOfMethodCallArguments(method);
if (ParameterIsAssignable(pms[0], operand.Type)) {
ValidateParamswithOperandsOrThrow(pms[0].ParameterType, operand.Type, unaryType, method.Name);
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// check for lifted call
if (TypeUtils.IsNullableType(operand.Type) &&
ParameterIsAssignable(pms[0], TypeUtils.GetNonNullableType(operand.Type)) &&
method.ReturnType.IsValueType && !TypeUtils.IsNullableType(method.ReturnType)) {
return new UnaryExpression(unaryType, operand, TypeUtils.GetNullableType(method.ReturnType), method);
}
throw Error.OperandTypesDoNotMatchParameters(unaryType, method.Name);
}
private static UnaryExpression GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType) {
UnaryExpression u = GetUserDefinedCoercion(coercionType, expression, convertToType);
if (u != null) {
return u;
}
throw Error.CoercionOperatorNotDefined(expression.Type, convertToType);
}
private static UnaryExpression GetUserDefinedCoercion(ExpressionType coercionType, Expression expression, Type convertToType) {
MethodInfo method = TypeUtils.GetUserDefinedCoercionMethod(expression.Type, convertToType, false);
if (method != null) {
return new UnaryExpression(coercionType, expression, convertToType, method);
} else {
return null;
}
}
private static UnaryExpression GetMethodBasedCoercionOperator(ExpressionType unaryType, Expression operand, Type convertToType, MethodInfo method) {
System.Diagnostics.Debug.Assert(method != null);
ValidateOperator(method);
ParameterInfo[] pms = method.GetParametersCached();
if (pms.Length != 1) {
throw Error.IncorrectNumberOfMethodCallArguments(method);
}
if (ParameterIsAssignable(pms[0], operand.Type) && TypeUtils.AreEquivalent(method.ReturnType, convertToType)) {
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// check for lifted call
if ((TypeUtils.IsNullableType(operand.Type) || TypeUtils.IsNullableType(convertToType)) &&
ParameterIsAssignable(pms[0], TypeUtils.GetNonNullableType(operand.Type)) &&
TypeUtils.AreEquivalent(method.ReturnType, TypeUtils.GetNonNullableType(convertToType))) {
return new UnaryExpression(unaryType, operand, convertToType, method);
}
throw Error.OperandTypesDoNotMatchParameters(unaryType, method.Name);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thrown when the unary minus operator is not defined for
public static UnaryExpression Negate(Expression expression) {
return Negate(expression, null);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thrown when
/// Thown when
public static UnaryExpression Negate(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type) && !TypeUtils.IsUnsignedInt(expression.Type)) {
return new UnaryExpression(ExpressionType.Negate, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Negate, "op_UnaryNegation", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Negate, expression, method);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thown when the unary minus operator is not defined for expression.Type.
public static UnaryExpression UnaryPlus(Expression expression) {
return UnaryPlus(expression, null);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thrown when
/// Thown when
public static UnaryExpression UnaryPlus(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.UnaryPlus, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.UnaryPlus, "op_UnaryPlus", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.UnaryPlus, expression, method);
}
/// Creates a
/// A
/// An
/// Thrown when
/// Thrown when the unary minus operator is not defined for
public static UnaryExpression NegateChecked(Expression expression) {
return NegateChecked(expression, null);
}
///Creates a
///A
///An
///
///
///
///
///
public static UnaryExpression NegateChecked(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type) && !TypeUtils.IsUnsignedInt(expression.Type)) {
return new UnaryExpression(ExpressionType.NegateChecked, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.NegateChecked, "op_UnaryNegation", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.NegateChecked, expression, method);
}
///Creates a
///A
///An
///
///The unary not operator is not defined for
public static UnaryExpression Not(Expression expression) {
return Not(expression, null);
}
///Creates a
///A
///An
///
///
///
///
///
public static UnaryExpression Not(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsIntegerOrBool(expression.Type)) {
return new UnaryExpression(ExpressionType.Not, expression, expression.Type, null);
}
UnaryExpression u = GetUserDefinedUnaryOperator(ExpressionType.Not, "op_LogicalNot", expression);
if (u != null) {
return u;
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Not, "op_OnesComplement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Not, expression, method);
}
///
/// Returns whether the expression evaluates to false.
///
/// An An instance of
public static UnaryExpression IsFalse(Expression expression) {
return IsFalse(expression, null);
}
///
/// Returns whether the expression evaluates to false.
///
///An An instance of
public static UnaryExpression IsFalse(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsBool(expression.Type)) {
return new UnaryExpression(ExpressionType.IsFalse, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.IsFalse, "op_False", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.IsFalse, expression, method);
}
///
/// Returns whether the expression evaluates to true.
///
/// An An instance of
public static UnaryExpression IsTrue(Expression expression) {
return IsTrue(expression, null);
}
///
/// Returns whether the expression evaluates to true.
///
///An An instance of
public static UnaryExpression IsTrue(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsBool(expression.Type)) {
return new UnaryExpression(ExpressionType.IsTrue, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.IsTrue, "op_True", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.IsTrue, expression, method);
}
///
/// Returns the expression representing the ones complement.
///
///An An instance of
public static UnaryExpression OnesComplement(Expression expression) {
return OnesComplement(expression, null);
}
///
/// Returns the expression representing the ones complement.
///
/// An An instance of
public static UnaryExpression OnesComplement(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsInteger(expression.Type)) {
return new UnaryExpression(ExpressionType.OnesComplement, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.OnesComplement, "op_OnesComplement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.OnesComplement, expression, method);
}
///Creates a
///A
///An
///
public static UnaryExpression TypeAs(Expression expression, Type type) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (type.IsValueType && !TypeUtils.IsNullableType(type)) {
throw Error.IncorrectTypeForTypeAs(type);
}
return new UnaryExpression(ExpressionType.TypeAs, expression, type, null);
}
///
/// Creates a
///
/// An An instance of
public static UnaryExpression Unbox(Expression expression, Type type) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
if (!expression.Type.IsInterface && expression.Type != typeof(object)) {
throw Error.InvalidUnboxType();
}
if (!type.IsValueType) throw Error.InvalidUnboxType();
TypeUtils.ValidateType(type);
return new UnaryExpression(ExpressionType.Unbox, expression, type, null);
}
///Creates a
///A
///An
///
///No conversion operator is defined between
public static UnaryExpression Convert(Expression expression, Type type) {
return Convert(expression, type, null);
}
///Creates a
///A
///An
///
///
///
///More than one method that matches the
///No conversion operator is defined between
public static UnaryExpression Convert(Expression expression, Type type, MethodInfo method) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (method == null) {
if (TypeUtils.HasIdentityPrimitiveOrNullableConversion(expression.Type, type) ||
TypeUtils.HasReferenceConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.Convert, expression, type, null);
}
return GetUserDefinedCoercionOrThrow(ExpressionType.Convert, expression, type);
}
return GetMethodBasedCoercionOperator(ExpressionType.Convert, expression, type, method);
}
///Creates a
///A
///An
///
///No conversion operator is defined between
public static UnaryExpression ConvertChecked(Expression expression, Type type) {
return ConvertChecked(expression, type, null);
}
///Creates a
///A
///An
///
///
///
///More than one method that matches the
///No conversion operator is defined between
public static UnaryExpression ConvertChecked(Expression expression, Type type, MethodInfo method) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (method == null) {
if (TypeUtils.HasIdentityPrimitiveOrNullableConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.ConvertChecked, expression, type, null);
}
if (TypeUtils.HasReferenceConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.Convert, expression, type, null);
}
return GetUserDefinedCoercionOrThrow(ExpressionType.ConvertChecked, expression, type);
}
return GetMethodBasedCoercionOperator(ExpressionType.ConvertChecked, expression, type, method);
}
///Creates a
///A
///An
///
///
///
public static UnaryExpression ArrayLength(Expression array) {
ContractUtils.RequiresNotNull(array, "array");
if (!array.Type.IsArray || !typeof(Array).IsAssignableFrom(array.Type)) {
throw Error.ArgumentMustBeArray();
}
if (array.Type.GetArrayRank() != 1) {
throw Error.ArgumentMustBeSingleDimensionalArrayType();
}
return new UnaryExpression(ExpressionType.ArrayLength, array, typeof(int), null);
}
///Creates a
///A
///An
///
public static UnaryExpression Quote(Expression expression) {
RequiresCanRead(expression, "expression");
if (!(expression is LambdaExpression)) throw Error.QuotedExpressionMustBeLambda();
return new UnaryExpression(ExpressionType.Quote, expression, expression.GetType(), null);
}
///
/// Creates a
/// A
public static UnaryExpression Rethrow() {
return Throw(null);
}
///
/// Creates a
///The new A
public static UnaryExpression Rethrow(Type type) {
return Throw(null, type);
}
///
/// Creates a
/// An A
public static UnaryExpression Throw(Expression value) {
return Throw(value, typeof(void));
}
///
/// Creates a
/// An A
public static UnaryExpression Throw(Expression value, Type type) {
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (value != null) {
RequiresCanRead(value, "value");
if (value.Type.IsValueType) throw Error.ArgumentMustNotHaveValueType();
}
return new UnaryExpression(ExpressionType.Throw, value, type, null);
}
///
/// Creates a
/// An A
public static UnaryExpression Increment(Expression expression) {
return Increment(expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression Increment(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.Increment, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Increment, "op_Increment", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Increment, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression Decrement(Expression expression) {
return Decrement(expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression Decrement(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.Decrement, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Decrement, "op_Decrement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Decrement, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PreIncrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PreIncrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PreIncrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PreIncrementAssign, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PreDecrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PreDecrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PreDecrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PreDecrementAssign, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PostIncrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PostIncrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PostIncrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PostIncrementAssign, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PostDecrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PostDecrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PostDecrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PostDecrementAssign, expression, method);
}
private static UnaryExpression MakeOpAssignUnary(ExpressionType kind, Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
RequiresCanWrite(expression, "expression");
UnaryExpression result;
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(kind, expression, expression.Type, null);
}
string name;
if (kind == ExpressionType.PreIncrementAssign || kind == ExpressionType.PostIncrementAssign) {
name = "op_Increment";
} else {
name = "op_Decrement";
}
result = GetUserDefinedUnaryOperatorOrThrow(kind, name, expression);
} else {
result = GetMethodBasedUnaryOperator(kind, expression, method);
}
// return type must be assignable back to the operand type
if (!TypeUtils.AreReferenceAssignable(expression.Type, result.Type)) {
throw Error.UserDefinedOpMustHaveValidReturnType(kind, method.Name);
}
return result;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System.Diagnostics;
using System.Dynamic.Utils;
using System.Reflection;
using System.Runtime.CompilerServices;
#if SILVERLIGHT
using System.Core;
#endif
namespace System.Linq.Expressions {
///
/// Represents an expression that has a unary operator.
///
#if !SILVERLIGHT
[DebuggerTypeProxy(typeof(Expression.UnaryExpressionProxy))]
#endif
public sealed class UnaryExpression : Expression {
private readonly Expression _operand;
private readonly MethodInfo _method;
private readonly ExpressionType _nodeType;
private readonly Type _type;
internal UnaryExpression(ExpressionType nodeType, Expression expression, Type type, MethodInfo method) {
_operand = expression;
_method = method;
_nodeType = nodeType;
_type = type;
}
///
/// Gets the static type of the expression that this
/// The
public sealed override Type Type {
get { return _type; }
}
///
/// Returns the node type of this
/// The
public sealed override ExpressionType NodeType {
get { return _nodeType; }
}
///
/// Gets the operand of the unary operation.
///
/// An
public Expression Operand {
get { return _operand; }
}
///
/// Gets the implementing method for the unary operation.
///
/// The
public MethodInfo Method {
get { return _method; }
}
///
/// Gets a value that indicates whether the expression tree node represents a lifted call to an operator.
///
/// true if the node represents a lifted call; otherwise, false.
public bool IsLifted {
get {
if (NodeType == ExpressionType.TypeAs || NodeType == ExpressionType.Quote || NodeType == ExpressionType.Throw) {
return false;
}
bool operandIsNullable = TypeUtils.IsNullableType(_operand.Type);
bool resultIsNullable = TypeUtils.IsNullableType(this.Type);
if (_method != null) {
return (operandIsNullable && !TypeUtils.AreEquivalent(_method.GetParametersCached()[0].ParameterType, _operand.Type)) ||
(resultIsNullable && !TypeUtils.AreEquivalent(_method.ReturnType, this.Type));
}
return operandIsNullable || resultIsNullable;
}
}
///
/// Gets a value that indicates whether the expression tree node represents a lifted call to an operator whose return type is lifted to a nullable type.
///
/// true if the operator's return type is lifted to a nullable type; otherwise, false.
public bool IsLiftedToNull {
get {
return IsLifted && TypeUtils.IsNullableType(this.Type);
}
}
///
/// Dispatches to the specific visit method for this node type.
///
protected internal override Expression Accept(ExpressionVisitor visitor) {
return visitor.VisitUnary(this);
}
///
/// Gets a value that indicates whether the expression tree node can be reduced.
///
public override bool CanReduce {
get {
switch (_nodeType) {
case ExpressionType.PreIncrementAssign:
case ExpressionType.PreDecrementAssign:
case ExpressionType.PostIncrementAssign:
case ExpressionType.PostDecrementAssign:
return true;
}
return false;
}
}
///
/// Reduces the expression node to a simpler expression.
/// If CanReduce returns true, this should return a valid expression.
/// This method is allowed to return another node which itself
/// must be reduced.
///
/// The reduced expression.
public override Expression Reduce() {
if (CanReduce) {
switch (_operand.NodeType) {
case ExpressionType.Index:
return ReduceIndex();
case ExpressionType.MemberAccess:
return ReduceMember();
default:
return ReduceVariable();
}
}
return this;
}
private bool IsPrefix {
get { return _nodeType == ExpressionType.PreIncrementAssign || _nodeType == ExpressionType.PreDecrementAssign; }
}
private UnaryExpression FunctionalOp(Expression operand) {
ExpressionType functional;
if (_nodeType == ExpressionType.PreIncrementAssign || _nodeType == ExpressionType.PostIncrementAssign) {
functional = ExpressionType.Increment;
} else {
functional = ExpressionType.Decrement;
}
return new UnaryExpression(functional, operand, operand.Type, _method);
}
private Expression ReduceVariable() {
if (IsPrefix) {
// (op) var
// ... is reduced into ...
// var = op(var)
return Assign(_operand, FunctionalOp(_operand));
}
// var (op)
// ... is reduced into ...
// temp = var
// var = op(var)
// temp
var temp = Parameter(_operand.Type, null);
return Block(
new[] { temp },
Assign(temp, _operand),
Assign(_operand, FunctionalOp(temp)),
temp
);
}
private Expression ReduceMember() {
var member = (MemberExpression)_operand;
if (member.Expression == null) {
//static member, reduce the same as variable
return ReduceVariable();
} else {
var temp1 = Parameter(member.Expression.Type, null);
var initTemp1 = Assign(temp1, member.Expression);
member = MakeMemberAccess(temp1, member.Member);
if (IsPrefix) {
// (op) value.member
// ... is reduced into ...
// temp1 = value
// temp1.member = op(temp1.member)
return Block(
new[] { temp1 },
initTemp1,
Assign(member, FunctionalOp(member))
);
}
// value.member (op)
// ... is reduced into ...
// temp1 = value
// temp2 = temp1.member
// temp1.member = op(temp2)
// temp2
var temp2 = Parameter(member.Type, null);
return Block(
new[] { temp1, temp2 },
initTemp1,
Assign(temp2, member),
Assign(member, FunctionalOp(temp2)),
temp2
);
}
}
private Expression ReduceIndex() {
// left[a0, a1, ... aN] (op)
//
// ... is reduced into ...
//
// tempObj = left
// tempArg0 = a0
// ...
// tempArgN = aN
// tempValue = tempObj[tempArg0, ... tempArgN]
// tempObj[tempArg0, ... tempArgN] = op(tempValue)
// tempValue
bool prefix = IsPrefix;
var index = (IndexExpression)_operand;
int count = index.Arguments.Count;
var block = new Expression[count + (prefix ? 2 : 4)];
var temps = new ParameterExpression[count + (prefix ? 1 : 2)];
var args = new ParameterExpression[count];
int i = 0;
temps[i] = Parameter(index.Object.Type, null);
block[i] = Assign(temps[i], index.Object);
i++;
while (i <= count) {
var arg = index.Arguments[i - 1];
args[i - 1] = temps[i] = Parameter(arg.Type, null);
block[i] = Assign(temps[i], arg);
i++;
}
index = MakeIndex(temps[0], index.Indexer, new TrueReadOnlyCollection(args));
if (!prefix) {
var lastTemp = temps[i] = Parameter(index.Type, null);
block[i] = Assign(temps[i], index);
i++;
Debug.Assert(i == temps.Length);
block[i++] = Assign(index, FunctionalOp(lastTemp));
block[i++] = lastTemp;
} else {
Debug.Assert(i == temps.Length);
block[i++] = Assign(index, FunctionalOp(index));
}
Debug.Assert(i == block.Length);
return Block(new TrueReadOnlyCollection(temps), new TrueReadOnlyCollection(block));
}
///
/// Creates a new expression that is like this one, but using the
/// supplied children. If all of the children are the same, it will
/// return this expression.
///
/// The This expression if no children changed, or an expression with the updated children.
public UnaryExpression Update(Expression operand) {
if (operand == Operand) {
return this;
}
return Expression.MakeUnary(NodeType, operand, Type, Method);
}
}
public partial class Expression {
///
/// Creates a
/// The The
/// Thrown when
/// Thrown when
public static UnaryExpression MakeUnary(ExpressionType unaryType, Expression operand, Type type) {
return MakeUnary(unaryType, operand, type, null);
}
///
/// Creates a
/// The The
/// Thrown when
/// Thrown when
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]
public static UnaryExpression MakeUnary(ExpressionType unaryType, Expression operand, Type type, MethodInfo method) {
switch (unaryType) {
case ExpressionType.Negate:
return Negate(operand, method);
case ExpressionType.NegateChecked:
return NegateChecked(operand, method);
case ExpressionType.Not:
return Not(operand, method);
case ExpressionType.IsFalse:
return IsFalse(operand, method);
case ExpressionType.IsTrue:
return IsTrue(operand, method);
case ExpressionType.OnesComplement:
return OnesComplement(operand, method);
case ExpressionType.ArrayLength:
return ArrayLength(operand);
case ExpressionType.Convert:
return Convert(operand, type, method);
case ExpressionType.ConvertChecked:
return ConvertChecked(operand, type, method);
case ExpressionType.Throw:
return Throw(operand, type);
case ExpressionType.TypeAs:
return TypeAs(operand, type);
case ExpressionType.Quote:
return Quote(operand);
case ExpressionType.UnaryPlus:
return UnaryPlus(operand, method);
case ExpressionType.Unbox:
return Unbox(operand, type);
case ExpressionType.Increment:
return Increment(operand, method);
case ExpressionType.Decrement:
return Decrement(operand, method);
case ExpressionType.PreIncrementAssign:
return PreIncrementAssign(operand, method);
case ExpressionType.PostIncrementAssign:
return PostIncrementAssign(operand, method);
case ExpressionType.PreDecrementAssign:
return PreDecrementAssign(operand, method);
case ExpressionType.PostDecrementAssign:
return PostDecrementAssign(operand, method);
default:
throw Error.UnhandledUnary(unaryType);
}
}
private static UnaryExpression GetUserDefinedUnaryOperatorOrThrow(ExpressionType unaryType, string name, Expression operand) {
UnaryExpression u = GetUserDefinedUnaryOperator(unaryType, name, operand);
if (u != null) {
ValidateParamswithOperandsOrThrow(u.Method.GetParametersCached()[0].ParameterType, operand.Type, unaryType, name);
return u;
}
throw Error.UnaryOperatorNotDefined(unaryType, operand.Type);
}
private static UnaryExpression GetUserDefinedUnaryOperator(ExpressionType unaryType, string name, Expression operand) {
Type operandType = operand.Type;
Type[] types = new Type[] { operandType };
Type nnOperandType = TypeUtils.GetNonNullableType(operandType);
BindingFlags flags = BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;
MethodInfo method = nnOperandType.GetMethodValidated(name, flags, null, types, null);
if (method != null) {
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// try lifted call
if (TypeUtils.IsNullableType(operandType)) {
types[0] = nnOperandType;
method = nnOperandType.GetMethodValidated(name, flags, null, types, null);
if (method != null && method.ReturnType.IsValueType && !TypeUtils.IsNullableType(method.ReturnType)) {
return new UnaryExpression(unaryType, operand, TypeUtils.GetNullableType(method.ReturnType), method);
}
}
return null;
}
private static UnaryExpression GetMethodBasedUnaryOperator(ExpressionType unaryType, Expression operand, MethodInfo method) {
System.Diagnostics.Debug.Assert(method != null);
ValidateOperator(method);
ParameterInfo[] pms = method.GetParametersCached();
if (pms.Length != 1)
throw Error.IncorrectNumberOfMethodCallArguments(method);
if (ParameterIsAssignable(pms[0], operand.Type)) {
ValidateParamswithOperandsOrThrow(pms[0].ParameterType, operand.Type, unaryType, method.Name);
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// check for lifted call
if (TypeUtils.IsNullableType(operand.Type) &&
ParameterIsAssignable(pms[0], TypeUtils.GetNonNullableType(operand.Type)) &&
method.ReturnType.IsValueType && !TypeUtils.IsNullableType(method.ReturnType)) {
return new UnaryExpression(unaryType, operand, TypeUtils.GetNullableType(method.ReturnType), method);
}
throw Error.OperandTypesDoNotMatchParameters(unaryType, method.Name);
}
private static UnaryExpression GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType) {
UnaryExpression u = GetUserDefinedCoercion(coercionType, expression, convertToType);
if (u != null) {
return u;
}
throw Error.CoercionOperatorNotDefined(expression.Type, convertToType);
}
private static UnaryExpression GetUserDefinedCoercion(ExpressionType coercionType, Expression expression, Type convertToType) {
MethodInfo method = TypeUtils.GetUserDefinedCoercionMethod(expression.Type, convertToType, false);
if (method != null) {
return new UnaryExpression(coercionType, expression, convertToType, method);
} else {
return null;
}
}
private static UnaryExpression GetMethodBasedCoercionOperator(ExpressionType unaryType, Expression operand, Type convertToType, MethodInfo method) {
System.Diagnostics.Debug.Assert(method != null);
ValidateOperator(method);
ParameterInfo[] pms = method.GetParametersCached();
if (pms.Length != 1) {
throw Error.IncorrectNumberOfMethodCallArguments(method);
}
if (ParameterIsAssignable(pms[0], operand.Type) && TypeUtils.AreEquivalent(method.ReturnType, convertToType)) {
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// check for lifted call
if ((TypeUtils.IsNullableType(operand.Type) || TypeUtils.IsNullableType(convertToType)) &&
ParameterIsAssignable(pms[0], TypeUtils.GetNonNullableType(operand.Type)) &&
TypeUtils.AreEquivalent(method.ReturnType, TypeUtils.GetNonNullableType(convertToType))) {
return new UnaryExpression(unaryType, operand, convertToType, method);
}
throw Error.OperandTypesDoNotMatchParameters(unaryType, method.Name);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thrown when the unary minus operator is not defined for
public static UnaryExpression Negate(Expression expression) {
return Negate(expression, null);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thrown when
/// Thown when
public static UnaryExpression Negate(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type) && !TypeUtils.IsUnsignedInt(expression.Type)) {
return new UnaryExpression(ExpressionType.Negate, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Negate, "op_UnaryNegation", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Negate, expression, method);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thown when the unary minus operator is not defined for expression.Type.
public static UnaryExpression UnaryPlus(Expression expression) {
return UnaryPlus(expression, null);
}
///
/// Creates a
/// An A
/// Thrown when
/// Thrown when
/// Thown when
public static UnaryExpression UnaryPlus(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.UnaryPlus, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.UnaryPlus, "op_UnaryPlus", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.UnaryPlus, expression, method);
}
/// Creates a
/// A
/// An
/// Thrown when
/// Thrown when the unary minus operator is not defined for
public static UnaryExpression NegateChecked(Expression expression) {
return NegateChecked(expression, null);
}
///Creates a
///A
///An
///
///
///
///
///
public static UnaryExpression NegateChecked(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type) && !TypeUtils.IsUnsignedInt(expression.Type)) {
return new UnaryExpression(ExpressionType.NegateChecked, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.NegateChecked, "op_UnaryNegation", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.NegateChecked, expression, method);
}
///Creates a
///A
///An
///
///The unary not operator is not defined for
public static UnaryExpression Not(Expression expression) {
return Not(expression, null);
}
///Creates a
///A
///An
///
///
///
///
///
public static UnaryExpression Not(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsIntegerOrBool(expression.Type)) {
return new UnaryExpression(ExpressionType.Not, expression, expression.Type, null);
}
UnaryExpression u = GetUserDefinedUnaryOperator(ExpressionType.Not, "op_LogicalNot", expression);
if (u != null) {
return u;
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Not, "op_OnesComplement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Not, expression, method);
}
///
/// Returns whether the expression evaluates to false.
///
/// An An instance of
public static UnaryExpression IsFalse(Expression expression) {
return IsFalse(expression, null);
}
///
/// Returns whether the expression evaluates to false.
///
///An An instance of
public static UnaryExpression IsFalse(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsBool(expression.Type)) {
return new UnaryExpression(ExpressionType.IsFalse, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.IsFalse, "op_False", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.IsFalse, expression, method);
}
///
/// Returns whether the expression evaluates to true.
///
/// An An instance of
public static UnaryExpression IsTrue(Expression expression) {
return IsTrue(expression, null);
}
///
/// Returns whether the expression evaluates to true.
///
///An An instance of
public static UnaryExpression IsTrue(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsBool(expression.Type)) {
return new UnaryExpression(ExpressionType.IsTrue, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.IsTrue, "op_True", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.IsTrue, expression, method);
}
///
/// Returns the expression representing the ones complement.
///
///An An instance of
public static UnaryExpression OnesComplement(Expression expression) {
return OnesComplement(expression, null);
}
///
/// Returns the expression representing the ones complement.
///
/// An An instance of
public static UnaryExpression OnesComplement(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsInteger(expression.Type)) {
return new UnaryExpression(ExpressionType.OnesComplement, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.OnesComplement, "op_OnesComplement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.OnesComplement, expression, method);
}
///Creates a
///A
///An
///
public static UnaryExpression TypeAs(Expression expression, Type type) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (type.IsValueType && !TypeUtils.IsNullableType(type)) {
throw Error.IncorrectTypeForTypeAs(type);
}
return new UnaryExpression(ExpressionType.TypeAs, expression, type, null);
}
///
/// Creates a
///
/// An An instance of
public static UnaryExpression Unbox(Expression expression, Type type) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
if (!expression.Type.IsInterface && expression.Type != typeof(object)) {
throw Error.InvalidUnboxType();
}
if (!type.IsValueType) throw Error.InvalidUnboxType();
TypeUtils.ValidateType(type);
return new UnaryExpression(ExpressionType.Unbox, expression, type, null);
}
///Creates a
///A
///An
///
///No conversion operator is defined between
public static UnaryExpression Convert(Expression expression, Type type) {
return Convert(expression, type, null);
}
///Creates a
///A
///An
///
///
///
///More than one method that matches the
///No conversion operator is defined between
public static UnaryExpression Convert(Expression expression, Type type, MethodInfo method) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (method == null) {
if (TypeUtils.HasIdentityPrimitiveOrNullableConversion(expression.Type, type) ||
TypeUtils.HasReferenceConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.Convert, expression, type, null);
}
return GetUserDefinedCoercionOrThrow(ExpressionType.Convert, expression, type);
}
return GetMethodBasedCoercionOperator(ExpressionType.Convert, expression, type, method);
}
///Creates a
///A
///An
///
///No conversion operator is defined between
public static UnaryExpression ConvertChecked(Expression expression, Type type) {
return ConvertChecked(expression, type, null);
}
///Creates a
///A
///An
///
///
///
///More than one method that matches the
///No conversion operator is defined between
public static UnaryExpression ConvertChecked(Expression expression, Type type, MethodInfo method) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (method == null) {
if (TypeUtils.HasIdentityPrimitiveOrNullableConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.ConvertChecked, expression, type, null);
}
if (TypeUtils.HasReferenceConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.Convert, expression, type, null);
}
return GetUserDefinedCoercionOrThrow(ExpressionType.ConvertChecked, expression, type);
}
return GetMethodBasedCoercionOperator(ExpressionType.ConvertChecked, expression, type, method);
}
///Creates a
///A
///An
///
///
///
public static UnaryExpression ArrayLength(Expression array) {
ContractUtils.RequiresNotNull(array, "array");
if (!array.Type.IsArray || !typeof(Array).IsAssignableFrom(array.Type)) {
throw Error.ArgumentMustBeArray();
}
if (array.Type.GetArrayRank() != 1) {
throw Error.ArgumentMustBeSingleDimensionalArrayType();
}
return new UnaryExpression(ExpressionType.ArrayLength, array, typeof(int), null);
}
///Creates a
///A
///An
///
public static UnaryExpression Quote(Expression expression) {
RequiresCanRead(expression, "expression");
if (!(expression is LambdaExpression)) throw Error.QuotedExpressionMustBeLambda();
return new UnaryExpression(ExpressionType.Quote, expression, expression.GetType(), null);
}
///
/// Creates a
/// A
public static UnaryExpression Rethrow() {
return Throw(null);
}
///
/// Creates a
///The new A
public static UnaryExpression Rethrow(Type type) {
return Throw(null, type);
}
///
/// Creates a
/// An A
public static UnaryExpression Throw(Expression value) {
return Throw(value, typeof(void));
}
///
/// Creates a
/// An A
public static UnaryExpression Throw(Expression value, Type type) {
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (value != null) {
RequiresCanRead(value, "value");
if (value.Type.IsValueType) throw Error.ArgumentMustNotHaveValueType();
}
return new UnaryExpression(ExpressionType.Throw, value, type, null);
}
///
/// Creates a
/// An A
public static UnaryExpression Increment(Expression expression) {
return Increment(expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression Increment(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.Increment, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Increment, "op_Increment", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Increment, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression Decrement(Expression expression) {
return Decrement(expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression Decrement(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.Decrement, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Decrement, "op_Decrement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Decrement, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PreIncrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PreIncrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PreIncrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PreIncrementAssign, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PreDecrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PreDecrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PreDecrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PreDecrementAssign, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PostIncrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PostIncrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PostIncrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PostIncrementAssign, expression, method);
}
///
/// Creates a
/// An A
public static UnaryExpression PostDecrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PostDecrementAssign, expression, null);
}
///
/// Creates a
/// An A
public static UnaryExpression PostDecrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PostDecrementAssign, expression, method);
}
private static UnaryExpression MakeOpAssignUnary(ExpressionType kind, Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
RequiresCanWrite(expression, "expression");
UnaryExpression result;
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(kind, expression, expression.Type, null);
}
string name;
if (kind == ExpressionType.PreIncrementAssign || kind == ExpressionType.PostIncrementAssign) {
name = "op_Increment";
} else {
name = "op_Decrement";
}
result = GetUserDefinedUnaryOperatorOrThrow(kind, name, expression);
} else {
result = GetMethodBasedUnaryOperator(kind, expression, method);
}
// return type must be assignable back to the operand type
if (!TypeUtils.AreReferenceAssignable(expression.Type, result.Type)) {
throw Error.UserDefinedOpMustHaveValidReturnType(kind, method.Name);
}
return result;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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