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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package com.sun.source.util;

import com.sun.source.tree.*;

/**
 * Provides methods to obtain the position of a Tree within a CompilationUnit.
 * A position is defined as a simple character offset from the start of a
 * CompilationUnit where the first character is at offset 0.
 *
 * @author Peter von der Ahé
 * @since 1.6
 */
public interface SourcePositions {

    /**
     * Returns the starting position of tree within file.  If tree is not found within
     * file, or if the starting position is not available,
     * returns {@link javax.tools.Diagnostic#NOPOS}.
     * The returned position must be at the start of the yield of this tree, that
     * is for any sub-tree of this tree, the following must hold:
     *
     * 
     * {@code tree.getStartPosition() <= subtree.getStartPosition()} or 

     * {@code tree.getStartPosition() == NOPOS} or 

     * {@code subtree.getStartPosition() == NOPOS}
     * 
     *
     * @param file CompilationUnit in which to find tree
     * @param tree tree for which a position is sought
     * @return the start position of tree
     */
     long getStartPosition(CompilationUnitTree file, Tree tree);

    /**
     * Returns the ending position of tree within file.  If tree is not found within
     * file, or if the ending position is not available,
     * returns {@link javax.tools.Diagnostic#NOPOS}.
     * The returned position must be at the end of the yield of this tree,
     * that is for any sub-tree of this tree, the following must hold:
     *
     * 
     * {@code tree.getEndPosition() >= subtree.getEndPosition()} or 

     * {@code tree.getEndPosition() == NOPOS} or 

     * {@code subtree.getEndPosition() == NOPOS}
     * 
     *
     * In addition, the following must hold:
     *
     * 
     * {@code tree.getStartPosition() <= tree.getEndPosition()} or 

     * {@code tree.getStartPosition() == NOPOS} or 

     * {@code tree.getEndPosition() == NOPOS}
     * 
     *
     * @param file CompilationUnit in which to find tree
     * @param tree tree for which a position is sought
     * @return the end position of tree
     */
     long getEndPosition(CompilationUnitTree file, Tree tree);

}