1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.eclipse.handlers;
import java.util.Arrays;
import lombok.Cleanup;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.eclipse.Eclipse;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.Assignment;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.CaseStatement;
import org.eclipse.jdt.internal.compiler.ast.CastExpression;
import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
import org.eclipse.jdt.internal.compiler.ast.MemberValuePair;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.SwitchStatement;
import org.eclipse.jdt.internal.compiler.ast.TryStatement;
import org.mangosdk.spi.ProviderFor;
/**
* Handles the {@code lombok.Cleanup} annotation for eclipse.
*/
@ProviderFor(EclipseAnnotationHandler.class)
public class HandleCleanup implements EclipseAnnotationHandler<Cleanup> {
public boolean handle(AnnotationValues<Cleanup> annotation, Annotation ast, EclipseNode annotationNode) {
String cleanupName = annotation.getInstance().value();
if (cleanupName.length() == 0) {
annotationNode.addError("cleanupName cannot be the empty string.");
return true;
}
if (annotationNode.up().getKind() != Kind.LOCAL) {
annotationNode.addError("@Cleanup is legal only on local variable declarations.");
return true;
}
LocalDeclaration decl = (LocalDeclaration)annotationNode.up().get();
if (decl.initialization == null) {
annotationNode.addError("@Cleanup variable declarations need to be initialized.");
return true;
}
EclipseNode ancestor = annotationNode.up().directUp();
ASTNode blockNode = ancestor.get();
final boolean isSwitch;
final Statement[] statements;
if (blockNode instanceof AbstractMethodDeclaration) {
isSwitch = false;
statements = ((AbstractMethodDeclaration)blockNode).statements;
} else if (blockNode instanceof Block) {
isSwitch = false;
statements = ((Block)blockNode).statements;
} else if (blockNode instanceof SwitchStatement) {
isSwitch = true;
statements = ((SwitchStatement)blockNode).statements;
} else {
annotationNode.addError("@Cleanup is legal only on a local variable declaration inside a block.");
return true;
}
if (statements == null) {
annotationNode.addError("LOMBOK BUG: Parent block does not contain any statements.");
return true;
}
int start = 0;
for (; start < statements.length ; start++) {
if (statements[start] == decl) break;
}
if (start == statements.length) {
annotationNode.addError("LOMBOK BUG: Can't find this local variable declaration inside its parent.");
return true;
}
start++; //We start with try{} *AFTER* the var declaration.
int end;
if (isSwitch) {
end = start + 1;
for (; end < statements.length ; end++) {
if (statements[end] instanceof CaseStatement) {
break;
}
}
} else end = statements.length;
//At this point:
// start-1 = Local Declaration marked with @Cleanup
// start = first instruction that needs to be wrapped into a try block
// end = last intruction of the scope -OR- last instruction before the next case label in switch statements.
// hence:
// [start, end) = statements for the try block.
Statement[] tryBlock = new Statement[end - start];
System.arraycopy(statements, start, tryBlock, 0, end-start);
//Remove the stuff we just dumped into the tryBlock, and then leave room for the try node.
int newStatementsLength = statements.length - (end-start); //Remove room for every statement moved into try block...
newStatementsLength += 1; //But add room for the TryStatement node itself.
Statement[] newStatements = new Statement[newStatementsLength];
System.arraycopy(statements, 0, newStatements, 0, start); //copy all statements before the try block verbatim.
System.arraycopy(statements, end, newStatements, start+1, statements.length - end); //For switch statements.
doAssignmentCheck(annotationNode, tryBlock, decl.name);
TryStatement tryStatement = new TryStatement();
Eclipse.setGeneratedBy(tryStatement, ast);
tryStatement.tryBlock = new Block(0);
tryStatement.tryBlock.statements = tryBlock;
newStatements[start] = tryStatement;
Statement[] finallyBlock = new Statement[1];
MessageSend unsafeClose = new MessageSend();
Eclipse.setGeneratedBy(unsafeClose, ast);
unsafeClose.sourceStart = ast.sourceStart;
unsafeClose.sourceEnd = ast.sourceEnd;
SingleNameReference receiver = new SingleNameReference(decl.name, 0);
Eclipse.setGeneratedBy(receiver, ast);
unsafeClose.receiver = receiver;
long nameSourcePosition = (long)ast.sourceStart << 32 | ast.sourceEnd;
if (ast.memberValuePairs() != null) for (MemberValuePair pair : ast.memberValuePairs()) {
if (pair.name != null && new String(pair.name).equals("value")) {
nameSourcePosition = (long)pair.value.sourceStart << 32 | pair.value.sourceEnd;
break;
}
}
unsafeClose.nameSourcePosition = nameSourcePosition;
unsafeClose.selector = cleanupName.toCharArray();
finallyBlock[0] = unsafeClose;
tryStatement.finallyBlock = new Block(0);
Eclipse.setGeneratedBy(tryStatement.finallyBlock, ast);
tryStatement.finallyBlock.statements = finallyBlock;
tryStatement.catchArguments = null;
tryStatement.catchBlocks = null;
if (blockNode instanceof AbstractMethodDeclaration) {
((AbstractMethodDeclaration)blockNode).statements = newStatements;
} else if (blockNode instanceof Block) {
((Block)blockNode).statements = newStatements;
} else if (blockNode instanceof SwitchStatement) {
((SwitchStatement)blockNode).statements = newStatements;
}
ancestor.rebuild();
return true;
}
private void doAssignmentCheck(EclipseNode node, Statement[] tryBlock, char[] varName) {
for (Statement statement : tryBlock) doAssignmentCheck0(node, statement, varName);
}
private void doAssignmentCheck0(EclipseNode node, Statement statement, char[] varName) {
if (statement instanceof Assignment)
doAssignmentCheck0(node, ((Assignment)statement).expression, varName);
else if (statement instanceof LocalDeclaration)
doAssignmentCheck0(node, ((LocalDeclaration)statement).initialization, varName);
else if (statement instanceof CastExpression)
doAssignmentCheck0(node, ((CastExpression)statement).expression, varName);
else if (statement instanceof SingleNameReference) {
if (Arrays.equals(((SingleNameReference)statement).token, varName)) {
EclipseNode problemNode = node.getNodeFor(statement);
if (problemNode != null) problemNode.addWarning(
"You're assigning an auto-cleanup variable to something else. This is a bad idea.");
}
}
}
}
|
