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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
#pragma once
#include "antlr4-common.h"
namespace antlr4 {
namespace tree {
/// <summary>
/// Associate a property with a parse tree node. Useful with parse tree
/// listeners that need to associate values with particular tree nodes, kind of
/// like specifying a return value for the listener event method that visited a
/// particular node. Example:
///
/// <pre>
/// ParseTreeProperty<Integer> values = new
/// ParseTreeProperty<Integer>(); values.put(tree, 36); int x =
/// values.get(tree); values.removeFrom(tree);
/// </pre>
///
/// You would make one decl (values here) in the listener and use lots of times
/// in your event methods.
/// </summary>
template <typename V>
class ANTLR4CPP_PUBLIC ParseTreeProperty {
public:
virtual V get(ParseTree* node) { return _annotations[node]; }
virtual void put(ParseTree* node, V value) { _annotations[node] = value; }
virtual V removeFrom(ParseTree* node) {
auto value = _annotations[node];
_annotations.erase(node);
return value;
}
protected:
std::map<ParseTree*, V> _annotations;
};
} // namespace tree
} // namespace antlr4
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