|
|
@@ -1,375 +0,0 @@
|
|
|
-// Licensed to the .NET Foundation under one or more agreements.
|
|
|
-// The .NET Foundation licenses this file to you under the Apache 2.0 License.
|
|
|
-// See the LICENSE file in the project root for more information.
|
|
|
-
|
|
|
-#if NO_EXPRESSIONVISITOR
|
|
|
-
|
|
|
-using System;
|
|
|
-using System.Collections.Generic;
|
|
|
-using System.Collections.ObjectModel;
|
|
|
-using System.Reflection;
|
|
|
-using System.Linq.Expressions;
|
|
|
-
|
|
|
-namespace System.Reactive.Linq
|
|
|
-{
|
|
|
- internal abstract class ExpressionVisitor
|
|
|
- {
|
|
|
- internal ExpressionVisitor()
|
|
|
- {
|
|
|
- }
|
|
|
-
|
|
|
- public virtual Expression Visit(Expression exp)
|
|
|
- {
|
|
|
- if (exp == null)
|
|
|
- return exp;
|
|
|
- switch (exp.NodeType)
|
|
|
- {
|
|
|
- case ExpressionType.UnaryPlus:
|
|
|
- case ExpressionType.Negate:
|
|
|
- case ExpressionType.NegateChecked:
|
|
|
- case ExpressionType.Not:
|
|
|
- case ExpressionType.Convert:
|
|
|
- case ExpressionType.ConvertChecked:
|
|
|
- case ExpressionType.ArrayLength:
|
|
|
- case ExpressionType.Quote:
|
|
|
- case ExpressionType.TypeAs:
|
|
|
- return this.VisitUnary((UnaryExpression)exp);
|
|
|
- case ExpressionType.Add:
|
|
|
- case ExpressionType.AddChecked:
|
|
|
- case ExpressionType.Subtract:
|
|
|
- case ExpressionType.SubtractChecked:
|
|
|
- case ExpressionType.Multiply:
|
|
|
- case ExpressionType.MultiplyChecked:
|
|
|
- case ExpressionType.Divide:
|
|
|
- case ExpressionType.Modulo:
|
|
|
- case ExpressionType.Power:
|
|
|
- case ExpressionType.And:
|
|
|
- case ExpressionType.AndAlso:
|
|
|
- case ExpressionType.Or:
|
|
|
- case ExpressionType.OrElse:
|
|
|
- case ExpressionType.LessThan:
|
|
|
- case ExpressionType.LessThanOrEqual:
|
|
|
- case ExpressionType.GreaterThan:
|
|
|
- case ExpressionType.GreaterThanOrEqual:
|
|
|
- case ExpressionType.Equal:
|
|
|
- case ExpressionType.NotEqual:
|
|
|
- case ExpressionType.Coalesce:
|
|
|
- case ExpressionType.ArrayIndex:
|
|
|
- case ExpressionType.RightShift:
|
|
|
- case ExpressionType.LeftShift:
|
|
|
- case ExpressionType.ExclusiveOr:
|
|
|
- return this.VisitBinary((BinaryExpression)exp);
|
|
|
- case ExpressionType.TypeIs:
|
|
|
- return this.VisitTypeIs((TypeBinaryExpression)exp);
|
|
|
- case ExpressionType.Conditional:
|
|
|
- return this.VisitConditional((ConditionalExpression)exp);
|
|
|
- case ExpressionType.Constant:
|
|
|
- return this.VisitConstant((ConstantExpression)exp);
|
|
|
- case ExpressionType.Parameter:
|
|
|
- return this.VisitParameter((ParameterExpression)exp);
|
|
|
- case ExpressionType.MemberAccess:
|
|
|
- return this.VisitMemberAccess((MemberExpression)exp);
|
|
|
- case ExpressionType.Call:
|
|
|
- return this.VisitMethodCall((MethodCallExpression)exp);
|
|
|
- case ExpressionType.Lambda:
|
|
|
- return this.VisitLambda((LambdaExpression)exp);
|
|
|
- case ExpressionType.New:
|
|
|
- return this.VisitNew((NewExpression)exp);
|
|
|
- case ExpressionType.NewArrayInit:
|
|
|
- case ExpressionType.NewArrayBounds:
|
|
|
- return this.VisitNewArray((NewArrayExpression)exp);
|
|
|
- case ExpressionType.Invoke:
|
|
|
- return this.VisitInvocation((InvocationExpression)exp);
|
|
|
- case ExpressionType.MemberInit:
|
|
|
- return this.VisitMemberInit((MemberInitExpression)exp);
|
|
|
- case ExpressionType.ListInit:
|
|
|
- return this.VisitListInit((ListInitExpression)exp);
|
|
|
- default:
|
|
|
- throw new InvalidOperationException();
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual MemberBinding VisitBinding(MemberBinding binding)
|
|
|
- {
|
|
|
- switch (binding.BindingType)
|
|
|
- {
|
|
|
- case MemberBindingType.Assignment:
|
|
|
- return this.VisitMemberAssignment((MemberAssignment)binding);
|
|
|
- case MemberBindingType.MemberBinding:
|
|
|
- return this.VisitMemberMemberBinding((MemberMemberBinding)binding);
|
|
|
- case MemberBindingType.ListBinding:
|
|
|
- return this.VisitMemberListBinding((MemberListBinding)binding);
|
|
|
- default:
|
|
|
- throw new InvalidOperationException();
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual ElementInit VisitElementInitializer(ElementInit initializer)
|
|
|
- {
|
|
|
- ReadOnlyCollection<Expression> arguments = this.VisitExpressionList(initializer.Arguments);
|
|
|
- if (arguments != initializer.Arguments)
|
|
|
- {
|
|
|
- return Expression.ElementInit(initializer.AddMethod, arguments);
|
|
|
- }
|
|
|
- return initializer;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitUnary(UnaryExpression u)
|
|
|
- {
|
|
|
- Expression operand = this.Visit(u.Operand);
|
|
|
- if (operand != u.Operand)
|
|
|
- {
|
|
|
- return Expression.MakeUnary(u.NodeType, operand, u.Type, u.Method);
|
|
|
- }
|
|
|
- return u;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitBinary(BinaryExpression b)
|
|
|
- {
|
|
|
- Expression left = this.Visit(b.Left);
|
|
|
- Expression right = this.Visit(b.Right);
|
|
|
- Expression conversion = this.Visit(b.Conversion);
|
|
|
- if (left != b.Left || right != b.Right || conversion != b.Conversion)
|
|
|
- {
|
|
|
- if (b.NodeType == ExpressionType.Coalesce && b.Conversion != null)
|
|
|
- return Expression.Coalesce(left, right, conversion as LambdaExpression);
|
|
|
- else
|
|
|
- return Expression.MakeBinary(b.NodeType, left, right, b.IsLiftedToNull, b.Method);
|
|
|
- }
|
|
|
- return b;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitTypeIs(TypeBinaryExpression b)
|
|
|
- {
|
|
|
- Expression expr = this.Visit(b.Expression);
|
|
|
- if (expr != b.Expression)
|
|
|
- {
|
|
|
- return Expression.TypeIs(expr, b.TypeOperand);
|
|
|
- }
|
|
|
- return b;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitConstant(ConstantExpression c)
|
|
|
- {
|
|
|
- return c;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitConditional(ConditionalExpression c)
|
|
|
- {
|
|
|
- Expression test = this.Visit(c.Test);
|
|
|
- Expression ifTrue = this.Visit(c.IfTrue);
|
|
|
- Expression ifFalse = this.Visit(c.IfFalse);
|
|
|
- if (test != c.Test || ifTrue != c.IfTrue || ifFalse != c.IfFalse)
|
|
|
- {
|
|
|
- return Expression.Condition(test, ifTrue, ifFalse);
|
|
|
- }
|
|
|
- return c;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitParameter(ParameterExpression p)
|
|
|
- {
|
|
|
- return p;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitMemberAccess(MemberExpression m)
|
|
|
- {
|
|
|
- Expression exp = this.Visit(m.Expression);
|
|
|
- if (exp != m.Expression)
|
|
|
- {
|
|
|
- return Expression.MakeMemberAccess(exp, m.Member);
|
|
|
- }
|
|
|
- return m;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitMethodCall(MethodCallExpression m)
|
|
|
- {
|
|
|
- Expression obj = this.Visit(m.Object);
|
|
|
- IEnumerable<Expression> args = this.VisitExpressionList(m.Arguments);
|
|
|
- if (obj != m.Object || args != m.Arguments)
|
|
|
- {
|
|
|
- return Expression.Call(obj, m.Method, args);
|
|
|
- }
|
|
|
- return m;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual ReadOnlyCollection<Expression> VisitExpressionList(ReadOnlyCollection<Expression> original)
|
|
|
- {
|
|
|
- List<Expression> list = null;
|
|
|
- for (int i = 0, n = original.Count; i < n; i++)
|
|
|
- {
|
|
|
- Expression p = this.Visit(original[i]);
|
|
|
- if (list != null)
|
|
|
- {
|
|
|
- list.Add(p);
|
|
|
- }
|
|
|
- else if (p != original[i])
|
|
|
- {
|
|
|
- list = new List<Expression>(n);
|
|
|
- for (int j = 0; j < i; j++)
|
|
|
- {
|
|
|
- list.Add(original[j]);
|
|
|
- }
|
|
|
- list.Add(p);
|
|
|
- }
|
|
|
- }
|
|
|
- if (list != null)
|
|
|
- return new ReadOnlyCollection<Expression>(list);
|
|
|
- return original;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual MemberAssignment VisitMemberAssignment(MemberAssignment assignment)
|
|
|
- {
|
|
|
- Expression e = this.Visit(assignment.Expression);
|
|
|
- if (e != assignment.Expression)
|
|
|
- {
|
|
|
- return Expression.Bind(assignment.Member, e);
|
|
|
- }
|
|
|
- return assignment;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding binding)
|
|
|
- {
|
|
|
- IEnumerable<MemberBinding> bindings = this.VisitBindingList(binding.Bindings);
|
|
|
- if (bindings != binding.Bindings)
|
|
|
- {
|
|
|
- return Expression.MemberBind(binding.Member, bindings);
|
|
|
- }
|
|
|
- return binding;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual MemberListBinding VisitMemberListBinding(MemberListBinding binding)
|
|
|
- {
|
|
|
- IEnumerable<ElementInit> initializers = this.VisitElementInitializerList(binding.Initializers);
|
|
|
- if (initializers != binding.Initializers)
|
|
|
- {
|
|
|
- return Expression.ListBind(binding.Member, initializers);
|
|
|
- }
|
|
|
- return binding;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual IEnumerable<MemberBinding> VisitBindingList(ReadOnlyCollection<MemberBinding> original)
|
|
|
- {
|
|
|
- List<MemberBinding> list = null;
|
|
|
- for (int i = 0, n = original.Count; i < n; i++)
|
|
|
- {
|
|
|
- MemberBinding b = this.VisitBinding(original[i]);
|
|
|
- if (list != null)
|
|
|
- {
|
|
|
- list.Add(b);
|
|
|
- }
|
|
|
- else if (b != original[i])
|
|
|
- {
|
|
|
- list = new List<MemberBinding>(n);
|
|
|
- for (int j = 0; j < i; j++)
|
|
|
- {
|
|
|
- list.Add(original[j]);
|
|
|
- }
|
|
|
- list.Add(b);
|
|
|
- }
|
|
|
- }
|
|
|
- if (list != null)
|
|
|
- return list;
|
|
|
- return original;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual IEnumerable<ElementInit> VisitElementInitializerList(ReadOnlyCollection<ElementInit> original)
|
|
|
- {
|
|
|
- List<ElementInit> list = null;
|
|
|
- for (int i = 0, n = original.Count; i < n; i++)
|
|
|
- {
|
|
|
- ElementInit init = this.VisitElementInitializer(original[i]);
|
|
|
- if (list != null)
|
|
|
- {
|
|
|
- list.Add(init);
|
|
|
- }
|
|
|
- else if (init != original[i])
|
|
|
- {
|
|
|
- list = new List<ElementInit>(n);
|
|
|
- for (int j = 0; j < i; j++)
|
|
|
- {
|
|
|
- list.Add(original[j]);
|
|
|
- }
|
|
|
- list.Add(init);
|
|
|
- }
|
|
|
- }
|
|
|
- if (list != null)
|
|
|
- return list;
|
|
|
- return original;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitLambda(LambdaExpression lambda)
|
|
|
- {
|
|
|
- Expression body = this.Visit(lambda.Body);
|
|
|
- if (body != lambda.Body)
|
|
|
- {
|
|
|
- return Expression.Lambda(lambda.Type, body, lambda.Parameters);
|
|
|
- }
|
|
|
- return lambda;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual NewExpression VisitNew(NewExpression nex)
|
|
|
- {
|
|
|
- IEnumerable<Expression> args = this.VisitExpressionList(nex.Arguments);
|
|
|
- if (args != nex.Arguments)
|
|
|
- {
|
|
|
- if (nex.Members != null)
|
|
|
- return Expression.New(nex.Constructor, args, nex.Members);
|
|
|
- else
|
|
|
- return Expression.New(nex.Constructor, args);
|
|
|
- }
|
|
|
- return nex;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitMemberInit(MemberInitExpression init)
|
|
|
- {
|
|
|
- NewExpression n = this.VisitNew(init.NewExpression);
|
|
|
- IEnumerable<MemberBinding> bindings = this.VisitBindingList(init.Bindings);
|
|
|
- if (n != init.NewExpression || bindings != init.Bindings)
|
|
|
- {
|
|
|
- return Expression.MemberInit(n, bindings);
|
|
|
- }
|
|
|
- return init;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitListInit(ListInitExpression init)
|
|
|
- {
|
|
|
- NewExpression n = this.VisitNew(init.NewExpression);
|
|
|
- IEnumerable<ElementInit> initializers = this.VisitElementInitializerList(init.Initializers);
|
|
|
- if (n != init.NewExpression || initializers != init.Initializers)
|
|
|
- {
|
|
|
- return Expression.ListInit(n, initializers);
|
|
|
- }
|
|
|
- return init;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitNewArray(NewArrayExpression na)
|
|
|
- {
|
|
|
- IEnumerable<Expression> exprs = this.VisitExpressionList(na.Expressions);
|
|
|
- if (exprs != na.Expressions)
|
|
|
- {
|
|
|
- if (na.NodeType == ExpressionType.NewArrayInit)
|
|
|
- {
|
|
|
- return Expression.NewArrayInit(na.Type.GetElementType(), exprs);
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- return Expression.NewArrayBounds(na.Type.GetElementType(), exprs);
|
|
|
- }
|
|
|
- }
|
|
|
- return na;
|
|
|
- }
|
|
|
-
|
|
|
- protected virtual Expression VisitInvocation(InvocationExpression iv)
|
|
|
- {
|
|
|
- IEnumerable<Expression> args = this.VisitExpressionList(iv.Arguments);
|
|
|
- Expression expr = this.Visit(iv.Expression);
|
|
|
- if (args != iv.Arguments || expr != iv.Expression)
|
|
|
- {
|
|
|
- return Expression.Invoke(expr, args);
|
|
|
- }
|
|
|
- return iv;
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-#endif
|
Bart De Smet