Symbol.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / Rules / Parser / Symbol.cs / 1305376 / Symbol.cs
                        
                        
                            // ---------------------------------------------------------------------------- 
// Copyright (C) 2006 Microsoft Corporation All Rights Reserved
// ---------------------------------------------------------------------------

using System.CodeDom; 
using System.Collections;
using System.Collections.Generic; 
using System.Globalization; 
using System.Reflection;
using System.Text; 


namespace System.Workflow.Activities.Rules
{ 
    internal abstract class Symbol
    { 
        internal abstract string Name { get; } 
        internal abstract CodeExpression ParseRootIdentifier(Parser parser, ParserContext parserContext, bool assignIsEquality);
        internal abstract void RecordSymbol(ArrayList list); 
    }

    // Represents a field, property, or method within "this".  (Not a nested type.)
    internal class MemberSymbol : Symbol 
    {
        private MemberInfo member; 
 
        internal MemberSymbol(MemberInfo member)
        { 
            this.member = member;
        }

        internal override string Name 
        {
            get { return member.Name; } 
        } 

        internal override CodeExpression ParseRootIdentifier(Parser parser, ParserContext parserContext, bool assignIsEquality) 
        {
            return parser.ParseUnadornedMemberIdentifier(parserContext, this, assignIsEquality);
        }
 
        internal override void RecordSymbol(ArrayList list)
        { 
            list.Add(member); 
        }
    } 

    internal class NamespaceSymbol : Symbol
    {
        private string name; 
        internal readonly NamespaceSymbol Parent;
        internal Dictionary NestedSymbols; 
        internal readonly int Level; 

        internal NamespaceSymbol(string name, NamespaceSymbol parent) 
        {
            this.name = name;
            this.Parent = parent;
            this.Level = (parent == null) ? 0 : parent.Level + 1; 
        }
 
        // For unnamed namespaces.  There is only one of these. 
        internal NamespaceSymbol()
        { 
        }

        internal override string Name
        { 
            get { return name; }
        } 
 
        internal NamespaceSymbol AddNamespace(string nsName)
        { 
            if (NestedSymbols == null)
                NestedSymbols = new Dictionary();

            Symbol ns = null; 
            if (!NestedSymbols.TryGetValue(nsName, out ns))
            { 
                ns = new NamespaceSymbol(nsName, this); 
                NestedSymbols.Add(nsName, ns);
            } 

            return ns as NamespaceSymbol;
        }
 
        internal void AddType(Type type)
        { 
            TypeSymbol typeSym = new TypeSymbol(type); 
            string typeName = typeSym.Name;
 
            if (NestedSymbols == null)
                NestedSymbols = new Dictionary();

            Symbol existingSymbol = null; 
            if (NestedSymbols.TryGetValue(typeName, out existingSymbol))
            { 
                OverloadedTypeSymbol overloadSym = existingSymbol as OverloadedTypeSymbol; 
                if (overloadSym == null)
                { 
 					TypeSymbol typeSymbol = existingSymbol as TypeSymbol;
					System.Diagnostics.Debug.Assert(typeSymbol != null);
					overloadSym = new OverloadedTypeSymbol(typeName, typeSym, typeSymbol);
                    NestedSymbols[typeName] = overloadSym; 
                }
                else 
                { 
                    overloadSym.AddLocalType(typeSym);
                } 
            }
            else
            {
                NestedSymbols.Add(typeName, typeSym); 
            }
        } 
 
        internal Symbol FindMember(string memberName)
        { 
            Symbol nestedSym = null;
			NestedSymbols.TryGetValue(memberName, out nestedSym);
            return nestedSym;
        } 

        internal ArrayList GetMembers() 
        { 
            ArrayList members = new ArrayList(NestedSymbols.Count);
            foreach (Symbol sym in NestedSymbols.Values) 
                sym.RecordSymbol(members);

            return members;
        } 

        internal string GetQualifiedName() 
        { 
            StringBuilder sb = new StringBuilder();
 
            Stack names = new Stack();

            names.Push(Name);
            for (NamespaceSymbol currentParent = Parent; currentParent != null; currentParent = currentParent.Parent) 
                names.Push(currentParent.Name);
 
            sb.Append(names.Pop()); 
            while (names.Count > 0)
            { 
                sb.Append('.');
                sb.Append(names.Pop());
            }
 
            return sb.ToString();
        } 
 
        internal override CodeExpression ParseRootIdentifier(Parser parser, ParserContext parserContext, bool assignIsEquality)
        { 
            return parser.ParseRootNamespaceIdentifier(parserContext, this, assignIsEquality);
        }

        internal override void RecordSymbol(ArrayList list) 
        {
            // Just add the name (string) to the member list. 
            list.Add(Name); 
        }
    } 

    internal abstract class TypeSymbolBase : Symbol
    {
        internal abstract OverloadedTypeSymbol OverloadType(TypeSymbolBase typeSymBase); 
    }
 
    internal class TypeSymbol : TypeSymbolBase 
    {
        internal readonly Type Type; 
        internal readonly int GenericArgCount;
        private string name;

        internal TypeSymbol(Type type) 
        {
            this.Type = type; 
            this.name = type.Name; 

            if (type.IsGenericType) 
            {
                int tickIx = type.Name.LastIndexOf('`');
                if (tickIx > 0)
                { 
                    string count = type.Name.Substring(tickIx + 1);
                    GenericArgCount = Int32.Parse(count, CultureInfo.InvariantCulture); 
                    name = type.Name.Substring(0, tickIx); 
                }
            } 
        }

        internal override string Name
        { 
            get { return name; }
        } 
 
        internal override OverloadedTypeSymbol OverloadType(TypeSymbolBase newTypeSymBase)
        { 
            OverloadedTypeSymbol newTypeOverload = newTypeSymBase as OverloadedTypeSymbol;
            if (newTypeOverload != null)
            {
                // We've encountered an overloaded type symbol over a previous simple 
                // type symbol.
                return newTypeOverload.OverloadType(this); 
            } 
            else
            { 
                // We've encountered two simple types... just create an overload for them if
                // possible.
                TypeSymbol newTypeSym = newTypeSymBase as TypeSymbol;
                if (newTypeSym != null && this.CanOverload(newTypeSym)) 
                    return new OverloadedTypeSymbol(name, this, newTypeSym);
            } 
 
            return null;
        } 

        internal bool CanOverload(TypeSymbol typeSym)
        {
            return typeSym.GenericArgCount != this.GenericArgCount; 
        }
 
        internal override CodeExpression ParseRootIdentifier(Parser parser, ParserContext parserContext, bool assignIsEquality) 
        {
            // The root name is a type (might be generic or not). 
            return parser.ParseRootTypeIdentifier(parserContext, this, assignIsEquality);
        }

        internal override void RecordSymbol(ArrayList list) 
        {
            // Add the System.Type to the member list. 
            list.Add(Type); 
        }
    } 

    internal class OverloadedTypeSymbol : TypeSymbolBase
    {
        internal List TypeSymbols = new List(); 
        private string name;
 
        internal OverloadedTypeSymbol(string name, TypeSymbol typeSym1, TypeSymbol typeSym2) 
        {
            this.name = name; 
            AddLocalType(typeSym1);
            AddLocalType(typeSym2);
        }
 
        private OverloadedTypeSymbol(string name, List typeSymbols)
        { 
            this.name = name; 
            this.TypeSymbols = typeSymbols;
        } 

        internal override string Name
        {
            get { return name; } 
        }
 
        // Add a local overload (within the same namespace). 
        internal void AddLocalType(TypeSymbol typeSym)
        { 
            // Since it's a local overload, we don't have to check whether it's ambiguous.
            TypeSymbols.Add(typeSym);
        }
 
        internal override OverloadedTypeSymbol OverloadType(TypeSymbolBase newTypeSymBase)
        { 
            List newOverloads = new List(); 
            TypeSymbol typeSym = null;
 
            OverloadedTypeSymbol newTypeOverload = newTypeSymBase as OverloadedTypeSymbol;
            if (newTypeOverload != null)
            {
                newOverloads.AddRange(newTypeOverload.TypeSymbols); 
            }
            else 
            { 
                // We've encountered a simple type... just create an overload for them if
                // possible. 
                typeSym = newTypeSymBase as TypeSymbol;
                if (typeSym != null)
                    newOverloads.Add(typeSym);
            } 

            // If every item in this overloaded type symbol is overloadable with the new one, 
            // add to the new list all our items. 
            foreach (TypeSymbol thisTypeSym in this.TypeSymbols)
            { 
                foreach (TypeSymbol newTypeSym in newOverloads)
                {
                    if (!newTypeSym.CanOverload(thisTypeSym))
                        return null; // Can't overload 
                }
 
                newOverloads.Add(thisTypeSym); 
            }
 
            return new OverloadedTypeSymbol(name, newOverloads);
        }

        internal override CodeExpression ParseRootIdentifier(Parser parser, ParserContext parserContext, bool assignIsEquality) 
        {
            return parser.ParseRootOverloadedTypeIdentifier(parserContext, this.TypeSymbols, assignIsEquality); 
        } 

        internal override void RecordSymbol(ArrayList list) 
        {
            foreach (TypeSymbol overloadedType in TypeSymbols)
                list.Add(overloadedType.Type);
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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Symbol.cs source code in C# .NET

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