src/jdk.jshell/share/classes/jdk/jshell/GeneralWrap.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * accompanied this code).
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package jdk.jshell;

/**
 * Common interface for all wrappings of snippet source to Java source.
 *
 * Snippet index is index into the source of the snippet.  Note: If the snippet is a sub-range of
 * the source, the index is not the index in the snippet.
 *
 * Wrap index is index into the wrapped snippet.
 */
interface GeneralWrap {

    String wrapped();

    int snippetIndexToWrapIndex(int sni);

    int wrapIndexToSnippetIndex(int wi);

    default int wrapIndexToSnippetIndex(long wi) {
        return wrapIndexToSnippetIndex((int) wi);
    }

    int firstSnippetIndex();

    int lastSnippetIndex();

    int snippetLineToWrapLine(int snline);

    int wrapLineToSnippetLine(int wline);

    int firstSnippetLine();

    int lastSnippetLine();

    default String debugPos(long lpos) {
        int pos = (int) lpos;
        int len = wrapped().length();
        return wrapped().substring(Math.max(0, pos - 10), Math.max(0, Math.min(len, pos)))
                + "###"
                + wrapped().substring(Math.max(0, Math.min(len, pos)), Math.max(0, Math.min(len, pos + 10)));
    }
}