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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Ast/Expressions/Expression.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory.CSharp/Ast/Expressions/Expression.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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// 
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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// 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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namespace ICSharpCode.NRefactory.CSharp
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{
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        /// <summary>
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        /// Base class for expressions.
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        /// </summary>
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        /// <remarks>
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        /// This class is useful even though it doesn't provide any additional functionality:
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        /// It can be used to communicate more information in APIs, e.g. "this subnode will always be an expression"
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        /// </remarks>
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        public abstract class Expression : AstNode
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        {
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                #region Null
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                public new static readonly Expression Null = new NullExpression ();
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                sealed class NullExpression : Expression
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                {
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                        public override bool IsNull {
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                                get {
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                                        return true;
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                                }
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                        }
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                        public override void AcceptVisitor (IAstVisitor visitor)
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                        {
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                        }
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                        public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
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                        {
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                                return default (T);
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                        }
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                        public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
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                        {
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                                return default (S);
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                        }
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                        protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
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                        {
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                                return other == null || other.IsNull;
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                        }
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                }
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                #endregion
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                #region PatternPlaceholder
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                public static implicit operator Expression(PatternMatching.Pattern pattern)
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                {
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                        return pattern != null ? new PatternPlaceholder(pattern) : null;
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                }
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                sealed class PatternPlaceholder : Expression, PatternMatching.INode
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                {
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                        readonly PatternMatching.Pattern child;
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                        public PatternPlaceholder(PatternMatching.Pattern child)
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                        {
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                                this.child = child;
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                        }
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                        public override NodeType NodeType {
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                                get { return NodeType.Pattern; }
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                        }
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                        public override void AcceptVisitor (IAstVisitor visitor)
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                        {
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                                visitor.VisitPatternPlaceholder(this, child);
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                        }
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                        public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
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                        {
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                                return visitor.VisitPatternPlaceholder(this, child);
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                        }
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                        public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
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                        {
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                                return visitor.VisitPatternPlaceholder(this, child, data);
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                        }
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                        protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
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                        {
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                                return child.DoMatch(other, match);
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                        }
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                        bool PatternMatching.INode.DoMatchCollection(Role role, PatternMatching.INode pos, PatternMatching.Match match, PatternMatching.BacktrackingInfo backtrackingInfo)
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                        {
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                                return child.DoMatchCollection(role, pos, match, backtrackingInfo);
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                        }
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                }
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                #endregion
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                public override NodeType NodeType {
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                        get {
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                                return NodeType.Expression;
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                        }
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                }
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                public new Expression Clone()
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                {
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                        return (Expression)base.Clone();
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                }
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                // Make debugging easier by giving Expressions a ToString() implementation
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                public override string ToString()
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                {
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                        return DebugToString();
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                }
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                public Expression ReplaceWith(Func<Expression, Expression> replaceFunction)
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                {
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                        if (replaceFunction == null)
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                                throw new ArgumentNullException("replaceFunction");
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                        return (Expression)base.ReplaceWith(node => replaceFunction((Expression)node));
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                }
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                #region Builder methods
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                /// <summary>
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                /// Builds an member reference expression using this expression as target.
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                /// </summary>
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                public MemberReferenceExpression Member(string memberName)
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                {
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                        return new MemberReferenceExpression { Target = this, MemberName = memberName };
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                }
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                /// <summary>
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                /// Builds an indexer expression using this expression as target.
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                /// </summary>
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                public IndexerExpression Indexer(IEnumerable<Expression> arguments)
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                {
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                        IndexerExpression expr = new IndexerExpression();
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                        expr.Target = this;
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                        expr.Arguments.AddRange(arguments);
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                        return expr;
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                }
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                /// <summary>
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                /// Builds an indexer expression using this expression as target.
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                /// </summary>
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                public IndexerExpression Indexer(params Expression[] arguments)
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                {
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                        IndexerExpression expr = new IndexerExpression();
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                        expr.Target = this;
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                        expr.Arguments.AddRange(arguments);
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                        return expr;
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                }
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                /// <summary>
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                /// Builds an invocation expression using this expression as target.
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                /// </summary>
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                public InvocationExpression Invoke(string methodName, IEnumerable<Expression> arguments)
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                {
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                        return Invoke(methodName, null, arguments);
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                }
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                /// <summary>
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                /// Builds an invocation expression using this expression as target.
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                /// </summary>
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                public InvocationExpression Invoke(string methodName, params Expression[] arguments)
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                {
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                        return Invoke(methodName, null, arguments);
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                }
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                /// <summary>
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                /// Builds an invocation expression using this expression as target.
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                /// </summary>
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                public InvocationExpression Invoke(string methodName, IEnumerable<AstType> typeArguments, IEnumerable<Expression> arguments)
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                {
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                        InvocationExpression ie = new InvocationExpression();
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                        MemberReferenceExpression mre = new MemberReferenceExpression();
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                        mre.Target = this;
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                        mre.MemberName = methodName;
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                        mre.TypeArguments.AddRange(typeArguments);
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                        ie.Target = mre;
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                        ie.Arguments.AddRange(arguments);
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                        return ie;
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                }
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                /// <summary>
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                /// Builds an invocation expression using this expression as target.
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                /// </summary>
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                public InvocationExpression Invoke(IEnumerable<Expression> arguments)
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                {
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                        InvocationExpression ie = new InvocationExpression();
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                        ie.Target = this;
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                        ie.Arguments.AddRange(arguments);
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                        return ie;
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                }
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                /// <summary>
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                /// Builds an invocation expression using this expression as target.
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                /// </summary>
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                public InvocationExpression Invoke(params Expression[] arguments)
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                {
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                        InvocationExpression ie = new InvocationExpression();
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                        ie.Target = this;
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                        ie.Arguments.AddRange(arguments);
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                        return ie;
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                }
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                public CastExpression CastTo(AstType type)
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                {
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                        return new CastExpression { Type = type,  Expression = this };
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                }
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                public AsExpression CastAs(AstType type)
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                {
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                        return new AsExpression { Type = type,  Expression = this };
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                }
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                public IsExpression IsType(AstType type)
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                {
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                        return new IsExpression { Type = type,  Expression = this };
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                }
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                #endregion
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        }
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}