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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.
*/
package org.antlr.v4.runtime;
import org.antlr.v4.runtime.misc.Interval;
/** A source of characters for an ANTLR lexer. */
public interface CharStream extends IntStream {
/**
* This method returns the text for a range of characters within this input
* stream. This method is guaranteed to not throw an exception if the
* specified {@code interval} lies entirely within a marked range. For more
* information about marked ranges, see {@link IntStream#mark}.
*
* @param interval an interval within the stream
* @return the text of the specified interval
*
* @throws NullPointerException if {@code interval} is {@code null}
* @throws IllegalArgumentException if {@code interval.a < 0}, or if
* {@code interval.b < interval.a - 1}, or if {@code interval.b} lies at or
* past the end of the stream
* @throws UnsupportedOperationException if the stream does not support
* getting the text of the specified interval
*/
public String getText(Interval interval);
}