forked from jasder/antlr
72 lines
2.9 KiB
C#
72 lines
2.9 KiB
C#
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/*
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* [The "BSD license"]
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* Copyright (c) 2013 Terence Parr
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* Copyright (c) 2013 Sam Harwell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System.Collections.Generic;
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using Antlr4.Runtime.Tree;
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using Sharpen;
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namespace Antlr4.Runtime.Tree
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{
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/// <summary>Associate a property with a parse tree node.</summary>
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/// <remarks>
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/// Associate a property with a parse tree node. Useful with parse tree listeners
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/// that need to associate values with particular tree nodes, kind of like
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/// specifying a return value for the listener event method that visited a
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/// particular node. Example:
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/// <pre>
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/// ParseTreeProperty<Integer> values = new ParseTreeProperty<Integer>();
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/// values.put(tree, 36);
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/// int x = values.get(tree);
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/// values.removeFrom(tree);
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/// </pre>
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/// You would make one decl (values here) in the listener and use lots of times
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/// in your event methods.
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/// </remarks>
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public class ParseTreeProperty<V>
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{
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protected internal IDictionary<IParseTree, V> annotations = new IdentityHashMap<IParseTree
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, V>();
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public virtual V Get(IParseTree node)
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{
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return annotations.Get(node);
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}
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public virtual void Put(IParseTree node, V value)
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{
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annotations.Put(node, value);
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}
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public virtual V RemoveFrom(IParseTree node)
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{
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return Sharpen.Collections.Remove(annotations, node);
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}
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}
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}
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