Sat, 07 Nov 2020 10:30:02 +0800
Added tag mips-jdk8u275-b01 for changeset eb6ee6a5f2fe
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. Oracle designates this |
aoqi@0 | 8 | * particular file as subject to the "Classpath" exception as provided |
aoqi@0 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
aoqi@0 | 10 | * |
aoqi@0 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 15 | * accompanied this code). |
aoqi@0 | 16 | * |
aoqi@0 | 17 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 20 | * |
aoqi@0 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 22 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 23 | * questions. |
aoqi@0 | 24 | */ |
aoqi@0 | 25 | |
aoqi@0 | 26 | package com.sun.source.util; |
aoqi@0 | 27 | |
aoqi@0 | 28 | import java.util.Iterator; |
aoqi@0 | 29 | |
aoqi@0 | 30 | import com.sun.source.tree.*; |
aoqi@0 | 31 | |
aoqi@0 | 32 | /** |
aoqi@0 | 33 | * A path of tree nodes, typically used to represent the sequence of ancestor |
aoqi@0 | 34 | * nodes of a tree node up to the top level CompilationUnitTree node. |
aoqi@0 | 35 | * |
aoqi@0 | 36 | * @author Jonathan Gibbons |
aoqi@0 | 37 | * @since 1.6 |
aoqi@0 | 38 | */ |
aoqi@0 | 39 | @jdk.Exported |
aoqi@0 | 40 | public class TreePath implements Iterable<Tree> { |
aoqi@0 | 41 | /** |
aoqi@0 | 42 | * Gets a tree path for a tree node within a compilation unit. |
aoqi@0 | 43 | * @return null if the node is not found |
aoqi@0 | 44 | */ |
aoqi@0 | 45 | public static TreePath getPath(CompilationUnitTree unit, Tree target) { |
aoqi@0 | 46 | return getPath(new TreePath(unit), target); |
aoqi@0 | 47 | } |
aoqi@0 | 48 | |
aoqi@0 | 49 | /** |
aoqi@0 | 50 | * Gets a tree path for a tree node within a subtree identified by a TreePath object. |
aoqi@0 | 51 | * @return null if the node is not found |
aoqi@0 | 52 | */ |
aoqi@0 | 53 | public static TreePath getPath(TreePath path, Tree target) { |
aoqi@0 | 54 | path.getClass(); |
aoqi@0 | 55 | target.getClass(); |
aoqi@0 | 56 | |
aoqi@0 | 57 | class Result extends Error { |
aoqi@0 | 58 | static final long serialVersionUID = -5942088234594905625L; |
aoqi@0 | 59 | TreePath path; |
aoqi@0 | 60 | Result(TreePath path) { |
aoqi@0 | 61 | this.path = path; |
aoqi@0 | 62 | } |
aoqi@0 | 63 | } |
aoqi@0 | 64 | |
aoqi@0 | 65 | class PathFinder extends TreePathScanner<TreePath,Tree> { |
aoqi@0 | 66 | public TreePath scan(Tree tree, Tree target) { |
aoqi@0 | 67 | if (tree == target) { |
aoqi@0 | 68 | throw new Result(new TreePath(getCurrentPath(), target)); |
aoqi@0 | 69 | } |
aoqi@0 | 70 | return super.scan(tree, target); |
aoqi@0 | 71 | } |
aoqi@0 | 72 | } |
aoqi@0 | 73 | |
aoqi@0 | 74 | if (path.getLeaf() == target) { |
aoqi@0 | 75 | return path; |
aoqi@0 | 76 | } |
aoqi@0 | 77 | |
aoqi@0 | 78 | try { |
aoqi@0 | 79 | new PathFinder().scan(path, target); |
aoqi@0 | 80 | } catch (Result result) { |
aoqi@0 | 81 | return result.path; |
aoqi@0 | 82 | } |
aoqi@0 | 83 | return null; |
aoqi@0 | 84 | } |
aoqi@0 | 85 | |
aoqi@0 | 86 | /** |
aoqi@0 | 87 | * Creates a TreePath for a root node. |
aoqi@0 | 88 | */ |
aoqi@0 | 89 | public TreePath(CompilationUnitTree t) { |
aoqi@0 | 90 | this(null, t); |
aoqi@0 | 91 | } |
aoqi@0 | 92 | |
aoqi@0 | 93 | /** |
aoqi@0 | 94 | * Creates a TreePath for a child node. |
aoqi@0 | 95 | */ |
aoqi@0 | 96 | public TreePath(TreePath p, Tree t) { |
aoqi@0 | 97 | if (t.getKind() == Tree.Kind.COMPILATION_UNIT) { |
aoqi@0 | 98 | compilationUnit = (CompilationUnitTree) t; |
aoqi@0 | 99 | parent = null; |
aoqi@0 | 100 | } |
aoqi@0 | 101 | else { |
aoqi@0 | 102 | compilationUnit = p.compilationUnit; |
aoqi@0 | 103 | parent = p; |
aoqi@0 | 104 | } |
aoqi@0 | 105 | leaf = t; |
aoqi@0 | 106 | } |
aoqi@0 | 107 | /** |
aoqi@0 | 108 | * Get the compilation unit associated with this path. |
aoqi@0 | 109 | */ |
aoqi@0 | 110 | public CompilationUnitTree getCompilationUnit() { |
aoqi@0 | 111 | return compilationUnit; |
aoqi@0 | 112 | } |
aoqi@0 | 113 | |
aoqi@0 | 114 | /** |
aoqi@0 | 115 | * Get the leaf node for this path. |
aoqi@0 | 116 | */ |
aoqi@0 | 117 | public Tree getLeaf() { |
aoqi@0 | 118 | return leaf; |
aoqi@0 | 119 | } |
aoqi@0 | 120 | |
aoqi@0 | 121 | /** |
aoqi@0 | 122 | * Get the path for the enclosing node, or null if there is no enclosing node. |
aoqi@0 | 123 | */ |
aoqi@0 | 124 | public TreePath getParentPath() { |
aoqi@0 | 125 | return parent; |
aoqi@0 | 126 | } |
aoqi@0 | 127 | |
aoqi@0 | 128 | /** |
aoqi@0 | 129 | * Iterates from leaves to root. |
aoqi@0 | 130 | */ |
aoqi@0 | 131 | @Override |
aoqi@0 | 132 | public Iterator<Tree> iterator() { |
aoqi@0 | 133 | return new Iterator<Tree>() { |
aoqi@0 | 134 | @Override |
aoqi@0 | 135 | public boolean hasNext() { |
aoqi@0 | 136 | return next != null; |
aoqi@0 | 137 | } |
aoqi@0 | 138 | |
aoqi@0 | 139 | @Override |
aoqi@0 | 140 | public Tree next() { |
aoqi@0 | 141 | Tree t = next.leaf; |
aoqi@0 | 142 | next = next.parent; |
aoqi@0 | 143 | return t; |
aoqi@0 | 144 | } |
aoqi@0 | 145 | |
aoqi@0 | 146 | @Override |
aoqi@0 | 147 | public void remove() { |
aoqi@0 | 148 | throw new UnsupportedOperationException(); |
aoqi@0 | 149 | } |
aoqi@0 | 150 | |
aoqi@0 | 151 | private TreePath next = TreePath.this; |
aoqi@0 | 152 | }; |
aoqi@0 | 153 | } |
aoqi@0 | 154 | |
aoqi@0 | 155 | private CompilationUnitTree compilationUnit; |
aoqi@0 | 156 | private Tree leaf; |
aoqi@0 | 157 | private TreePath parent; |
aoqi@0 | 158 | } |