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1 | /******************************************************************************* |
2 | * Copyright (c) 2000, 2011 IBM Corporation and others. | |
3 | * All rights reserved. This program and the accompanying materials | |
4 | * are made available under the terms of the Eclipse Public License v1.0 | |
5 | * which accompanies this distribution, and is available at | |
6 | * http://www.eclipse.org/legal/epl-v10.html | |
7 | * | |
8 | * Contributors: | |
9 | * IBM Corporation - initial API and implementation | |
10 | *******************************************************************************/ | |
11 | package org.eclipse.jdt.internal.corext.dom; | |
12 | ||
13 | import org.eclipse.core.runtime.Assert; | |
14 | ||
15 | import org.eclipse.jdt.core.dom.ASTNode; | |
16 | import org.eclipse.jdt.core.dom.ASTVisitor; | |
17 | import org.eclipse.jdt.core.dom.BodyDeclaration; | |
18 | import org.eclipse.jdt.core.dom.FieldDeclaration; | |
19 | import org.eclipse.jdt.core.dom.IVariableBinding; | |
20 | import org.eclipse.jdt.core.dom.Initializer; | |
21 | import org.eclipse.jdt.core.dom.MethodDeclaration; | |
22 | import org.eclipse.jdt.core.dom.SingleVariableDeclaration; | |
23 | import org.eclipse.jdt.core.dom.VariableDeclarationFragment; | |
24 | ||
25 | ||
26 | public class LocalVariableIndex extends ASTVisitor { | |
27 | ||
28 | private int fTopIndex; | |
29 | ||
30 | /** | |
31 | * Computes the maximum number of local variable declarations in the | |
32 | * given body declaration. | |
33 | * | |
34 | * @param declaration the body declaration. Must either be a method | |
35 | * declaration, or an initializer, or a field declaration. | |
36 | * @return the maximum number of local variables | |
37 | */ | |
38 | public static int perform(BodyDeclaration declaration) { | |
39 | Assert.isTrue(declaration != null); | |
40 | switch (declaration.getNodeType()) { | |
41 | case ASTNode.METHOD_DECLARATION: | |
42 | case ASTNode.FIELD_DECLARATION: | |
43 | case ASTNode.INITIALIZER: | |
44 | return internalPerform(declaration); | |
45 | default: | |
46 | throw new IllegalArgumentException(declaration.toString()); | |
47 | } | |
48 | } | |
49 | ||
50 | private static int internalPerform(BodyDeclaration methodOrInitializer) { | |
51 | // we have to find the outermost method/initializer/field declaration since a local or anonymous | |
52 | // type can reference final variables from the outer scope. | |
53 | BodyDeclaration target= methodOrInitializer; | |
54 | ASTNode parent= target.getParent(); | |
55 | while (parent != null) { | |
56 | if (parent instanceof MethodDeclaration || parent instanceof Initializer || parent instanceof FieldDeclaration) { | |
57 | target= (BodyDeclaration)parent; | |
58 | } | |
59 | parent= parent.getParent(); | |
60 | } | |
61 | ||
62 | return doPerform(target); | |
63 | } | |
64 | ||
65 | private static int doPerform(BodyDeclaration node) { | |
66 | LocalVariableIndex counter= new LocalVariableIndex(); | |
67 | node.accept(counter); | |
68 | return counter.fTopIndex; | |
69 | } | |
70 | ||
71 | @Override | |
72 | public boolean visit(SingleVariableDeclaration node) { | |
73 | handleVariableBinding(node.resolveBinding()); | |
74 | return true; | |
75 | } | |
76 | ||
77 | @Override | |
78 | public boolean visit(VariableDeclarationFragment node) { | |
79 | handleVariableBinding(node.resolveBinding()); | |
80 | return true; | |
81 | } | |
82 | ||
83 | private void handleVariableBinding(IVariableBinding binding) { | |
84 | if (binding == null) | |
85 | return; | |
86 | fTopIndex= Math.max(fTopIndex, binding.getVariableId()); | |
87 | } | |
88 | } |