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Resolving Symbolic References in a CodeDOM (Part 7)

, 2 Dec 2012 CDDL
Resolving symbolic references in a CodeDOM.
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Utilities
Mono.Cecil
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Nova.Test
Properties
Nova.UI
CodeDOM
Annotations
Base
Comments
Base
DocComments
CodeRef
Base
List
Name
Base
Other
Simple
CompilerDirectives
Base
Conditionals
Base
Messages
Base
Pragmas
Base
Symbols
Base
Base
Expressions
AnonymousMethods
Base
Operators
Base
Binary
Arithmetic
Base
Assignment
Base
Bitwise
Base
Conditional
Relational
Base
Shift
Base
Other
Base
Unary
Base
Other
References
Base
GotoTargets
Base
Methods
Namespaces
Other
Properties
Types
Base
Variables
Base
Projects
Namespaces
References
Base
Statements
Base
Conditionals
Base
Exceptions
Generics
Constraints
Base
Iterators
Base
Jumps
Loops
Methods
OperatorDecls
Miscellaneous
Namespaces
Properties
Base
Events
Types
Base
Variables
Base
Properties
Resolving
Utilties
// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using Nova.Parsing;
using Nova.Rendering;

namespace Nova.CodeDOM
{
    /// <summary>
    /// The common base class of all prefix unary operators (<see cref="Cast"/>, <see cref="Complement"/>,
    /// <see cref="Decrement"/>, <see cref="Increment"/>, <see cref="Negative"/>, <see cref="Not"/>, <see cref="Positive"/>).
    /// </summary>
    public abstract class PreUnaryOperator : UnaryOperator
    {
        #region /* CONSTRUCTORS */

        protected PreUnaryOperator(Expression expression)
            : base(expression)
        { }

        #endregion

        #region /* PARSING */

        protected PreUnaryOperator(Parser parser, CodeObject parent, bool skipParsing)
            : base(parser, parent)
        {
            if (!skipParsing)
            {
                parser.NextToken();  // Skip past the operator
                SetField(ref _expression, Parse(parser, this), false);

                // Move any EOL or Postfix annotations from the expression up to the parent if there are no
                // parens in the way - this "normalizes" the annotations to the highest node on the line.
                if (_expression != null && _expression.HasEOLOrPostAnnotations && parent != parser.GetNormalizationBlocker())
                    MoveEOLAndPostAnnotations(_expression);
            }
        }

        #endregion

        #region /* RESOLVING */

        /// <summary>
        /// Evaluate the type of the <see cref="Expression"/>.
        /// </summary>
        /// <returns>The resulting <see cref="TypeRef"/> or <see cref="UnresolvedRef"/>.</returns>
        public override TypeRefBase EvaluateType(bool withoutConstants)
        {
            // If we have a reference to an overloaded operator declaration, use its return type
            if (_operatorRef is OperatorRef)
                return ((OperatorRef)_operatorRef).GetReturnType();

            // Determine the type of the expression
            TypeRefBase typeRefBase = (_expression != null ? _expression.EvaluateType(withoutConstants) : null);
            if (typeRefBase is TypeRef)
            {
                TypeRef typeRef = (TypeRef)typeRefBase;

                // Handle a constant
                if (typeRef.IsConst)
                {
                    object result = EvaluateConstant(typeRef.GetConstantValue());
                    return (result != null ? new TypeRef(result) : typeRefBase);
                }

                // String, boolean, or enum operands aren't supported by default, but we'll just return the
                // unchanged type instead of 'object'.
            }

            // By default, the type is unchanged
            return typeRefBase;
        }

        /// <summary>
        /// Evaluate the result of the operator on the specified constant value.
        /// Supported types are: string, bool, enum, decimal, double, float, ulong, long, uint, int, ushort, short, char, byte, sbyte.
        /// </summary>
        /// <returns>
        /// The result, using the appropriate result type, including promoting smaller types to int. Returns null if the operation is invalid.
        /// </returns>
        protected virtual object EvaluateConstant(object constant)
        {
            // Assume the operation is invalid by default, which will result in the operation evaluating
            // to the type of the expression it operates on, with any constant value being lost.
            // This method will be overridden by operators that support constant values (Positive, Negative, Complement, Not).
            return null;
        }

        #endregion

        #region /* RENDERING */

        public override void AsTextExpression(CodeWriter writer, RenderFlags flags)
        {
            UpdateLineCol(writer, flags);
            AsTextOperator(writer, flags);
            if (_expression != null)
                _expression.AsText(writer, flags);
        }

        #endregion
    }
}

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This article, along with any associated source code and files, is licensed under The Common Development and Distribution License (CDDL)

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About the Author

KenBeckett
Software Developer (Senior)
United States United States
I've been writing software since the late 70's, currently focusing mainly on C#.NET. I also like to travel around the world, and I own a Chocolate Factory (sadly, none of my employees are oompa loompas).

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