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/*
 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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package com.redhat.ceylon.langtools.source.util;

import com.redhat.ceylon.langtools.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 {

    /**
     * Gets the starting position of tree within file.  If tree is not found within
     * file, or if the starting position is not available,
     * return {@link com.redhat.ceylon.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);

    /**
     * Gets the ending position of tree within file.  If tree is not found within
     * file, or if the ending position is not available,
     * return {@link com.redhat.ceylon.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);

}