60 lines
2.4 KiB
C#
60 lines
2.4 KiB
C#
/*
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[The "BSD license"]
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Copyright (c) 2012 Terence Parr
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Copyright (c) 2012 Sam Harwell
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All rights reserved.
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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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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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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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namespace Antlr.Runtime.Tree
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{
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/**
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*
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* @author Sam Harwell
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*/
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public interface IPositionTrackingStream
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{
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/**
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* Returns an element containing concrete information about the current
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* position in the stream.
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*
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* @param allowApproximateLocation if {@code false}, this method returns
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* {@code null} if an element containing exact information about the current
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* position is not available
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*/
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object GetKnownPositionElement(bool allowApproximateLocation);
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/**
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* Determines if the specified {@code element} contains concrete position
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* information.
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*
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* @param element the element to check
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* @return {@code true} if {@code element} contains concrete position
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* information, otherwise {@code false}
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*/
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bool HasPositionInformation(object element);
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}
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}
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