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Resolving Symbolic References in a CodeDOM (Part 7)

, 2 Dec 2012
Resolving symbolic references in a CodeDOM.
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Base
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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
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Types
Base
Variables
Base
Projects
Namespaces
References
Base
Statements
Base
Conditionals
Base
Exceptions
Generics
Constraints
Base
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Jumps
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Methods
OperatorDecls
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Base
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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;

namespace Nova.CodeDOM
{
    /// <summary>
    /// Assigns the right <see cref="Expression"/> to the left <see cref="Expression"/>.
    /// Also the common base class of all compound assignment operators (<see cref="AddAssign"/>, <see cref="BitwiseAndAssign"/>,
    /// <see cref="BitwiseOrAssign"/>, <see cref="BitwiseXorAssign"/>, <see cref="DivideAssign"/>, <see cref="LeftShiftAssign"/>,
    /// <see cref="ModAssign"/>, <see cref="MultiplyAssign"/>, <see cref="RightShiftAssign"/>, <see cref="SubtractAssign"/>).
    /// </summary>
    /// <remarks>
    /// The left <see cref="Expression"/> must be an assignable object ("lvalue").
    /// </remarks>
    public class Assignment : BinaryOperator
    {
        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create an <see cref="Assignment"/> with the specified left and right expressions.
        /// </summary>
        public Assignment(Expression left, Expression right)
            : base(left, right)
        { }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The symbol associated with the operator.
        /// </summary>
        public override string Symbol
        {
            get { return ParseToken; }
        }

        /// <summary>
        /// True if the expression is const.
        /// </summary>
        public override bool IsConst
        {
            // The result of an assignment is never const, because the lvalue must be a variable
            get { return false; }
        }

        #endregion

        #region /* PARSING */

        /// <summary>
        /// The token used to parse the code object.
        /// </summary>
        public const string ParseToken = "=";

        /// <summary>
        /// The precedence of the operator.
        /// </summary>
        public const int Precedence = 500;

        /// <summary>
        /// True if the operator is left-associative, or false if it's right-associative.
        /// </summary>
        public const bool LeftAssociative = false;

        internal static new void AddParsePoints()
        {
            // Use a parse-priority of 300 (FieldDecl uses 0, LocalDecl uses 100, MultiEnumMemberDecl uses 200)
            Parser.AddOperatorParsePoint(ParseToken, 300, Precedence, LeftAssociative, false, Parse);
        }

        /// <summary>
        /// Parse an <see cref="Assignment"/>.
        /// </summary>
        public static Assignment Parse(Parser parser, CodeObject parent, ParseFlags flags)
        {
            return new Assignment(parser, parent);
        }

        protected Assignment(Parser parser, CodeObject parent)
            : base(parser, parent)
        { }

        /// <summary>
        /// Get the precedence of the operator.
        /// </summary>
        public override int GetPrecedence()
        {
            return Precedence;
        }

        #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)
        {
            // The type of an assignment expression is the type of the left side
            return (_left != null ? _left.EvaluateType(withoutConstants) : null);
        }

        #endregion

        #region /* FORMATTING */

        /// <summary>
        /// True if the expression should have parens by default.
        /// </summary>
        public override bool HasParensDefault
        {
            get { return false; }  // No parens for assignments by default
        }

        #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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