-
Notifications
You must be signed in to change notification settings - Fork 82
/
ConvertToStringBufferFixCore.java
292 lines (247 loc) · 12.1 KB
/
ConvertToStringBufferFixCore.java
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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/*******************************************************************************
* Copyright (c) 2023 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Gayan Perera - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.corext.fix;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.NamingConventions;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.Assignment;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.ChildListPropertyDescriptor;
import org.eclipse.jdt.core.dom.ClassInstanceCreation;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.ExpressionStatement;
import org.eclipse.jdt.core.dom.IBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.IVariableBinding;
import org.eclipse.jdt.core.dom.InfixExpression;
import org.eclipse.jdt.core.dom.Initializer;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.MethodInvocation;
import org.eclipse.jdt.core.dom.SimpleName;
import org.eclipse.jdt.core.dom.SimpleType;
import org.eclipse.jdt.core.dom.Statement;
import org.eclipse.jdt.core.dom.VariableDeclarationFragment;
import org.eclipse.jdt.core.dom.VariableDeclarationStatement;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ListRewrite;
import org.eclipse.jdt.internal.core.manipulation.StubUtility;
import org.eclipse.jdt.internal.core.manipulation.dom.ASTResolving;
import org.eclipse.jdt.internal.core.manipulation.util.BasicElementLabels;
import org.eclipse.jdt.internal.corext.dom.ASTNodes;
import org.eclipse.jdt.internal.corext.refactoring.structure.CompilationUnitRewrite;
import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
import org.eclipse.jdt.internal.ui.text.correction.CorrectionMessages;
public class ConvertToStringBufferFixCore extends CompilationUnitRewriteOperationsFixCore {
public ConvertToStringBufferFixCore(String name, CompilationUnit compilationUnit, CompilationUnitRewriteOperation operation) {
super(name, compilationUnit, operation);
}
public static ConvertToStringBufferFixCore createConvertToStringBufferFix(CompilationUnit compilationUnit, ASTNode node) {
BodyDeclaration parentDecl= ASTResolving.findParentBodyDeclaration(node);
if (!(parentDecl instanceof MethodDeclaration) && !(parentDecl instanceof Initializer))
return null;
AST ast= node.getAST();
ITypeBinding stringBinding= ast.resolveWellKnownType("java.lang.String"); //$NON-NLS-1$
if (node instanceof Expression && !(node instanceof InfixExpression)) {
node= node.getParent();
}
if (node instanceof VariableDeclarationFragment) {
node= ((VariableDeclarationFragment) node).getInitializer();
} else if (node instanceof Assignment) {
node= ((Assignment) node).getRightHandSide();
}
InfixExpression oldInfixExpression= null;
while (node instanceof InfixExpression) {
InfixExpression curr= (InfixExpression) node;
if (curr.resolveTypeBinding() == stringBinding && curr.getOperator() == InfixExpression.Operator.PLUS) {
oldInfixExpression= curr; // is a infix expression we can use
} else {
break;
}
node= node.getParent();
}
if (oldInfixExpression == null) {
return null;
}
String bufferOrBuilderName;
SimpleName existingBuffer= getEnclosingAppendBuffer(oldInfixExpression);
if (JavaModelUtil.is50OrHigher(compilationUnit.getTypeRoot().getJavaProject())) {
bufferOrBuilderName= "StringBuilder"; //$NON-NLS-1$
} else {
bufferOrBuilderName= "StringBuffer"; //$NON-NLS-1$
}
var mechanismName= BasicElementLabels.getJavaElementName(existingBuffer == null ? bufferOrBuilderName : existingBuffer.getIdentifier());
var label= Messages.format(CorrectionMessages.QuickAssistProcessor_convert_to_string_buffer_description, mechanismName);
return new ConvertToStringBufferFixCore(label, compilationUnit, new ConvertToStringBufferProposalOperation(oldInfixExpression));
}
/**
* Checks
* <ul>
* <li>whether the given infix expression is the argument of a StringBuilder#append() or
* StringBuffer#append() invocation, and</li>
* <li>the append method is called on a simple variable, and</li>
* <li>the invocation occurs in a statement (not as nested expression)</li>
* </ul>
*
* @param infixExpression the infix expression
* @return the name of the variable we were appending to, or <code>null</code> if not matching
*/
private static SimpleName getEnclosingAppendBuffer(InfixExpression infixExpression) {
if (infixExpression.getLocationInParent() == MethodInvocation.ARGUMENTS_PROPERTY) {
MethodInvocation methodInvocation= (MethodInvocation) infixExpression.getParent();
// ..not in an expression.. (e.g. not sb.append("high" + 5).append(6);)
if (methodInvocation.getParent() instanceof Statement) {
// ..of a function called append:
if ("append".equals(methodInvocation.getName().getIdentifier())) { //$NON-NLS-1$
Expression expression= methodInvocation.getExpression();
// ..and the append is being called on a Simple object:
if (expression instanceof SimpleName) {
IBinding binding= ((SimpleName) expression).resolveBinding();
if (binding instanceof IVariableBinding) {
String typeName= ((IVariableBinding) binding).getType().getQualifiedName();
// And the object's type is a StringBuilder or StringBuffer:
if ("java.lang.StringBuilder".equals(typeName) || "java.lang.StringBuffer".equals(typeName)) { //$NON-NLS-1$ //$NON-NLS-2$
return (SimpleName) expression;
}
}
}
}
}
}
return null;
}
private static void collectInfixPlusOperands(Expression expression, List<Expression> collector) {
if (expression instanceof InfixExpression && ((InfixExpression) expression).getOperator() == InfixExpression.Operator.PLUS) {
InfixExpression infixExpression= (InfixExpression) expression;
collectInfixPlusOperands(infixExpression.getLeftOperand(), collector);
collectInfixPlusOperands(infixExpression.getRightOperand(), collector);
List<Expression> extendedOperands= infixExpression.extendedOperands();
for (Expression expression2 : extendedOperands) {
collectInfixPlusOperands(expression2, collector);
}
} else {
collector.add(expression);
}
}
private static class ConvertToStringBufferProposalOperation extends CompilationUnitRewriteOperation {
private InfixExpression oldInfixExpression;
public ConvertToStringBufferProposalOperation(InfixExpression oldInfixExpression) {
this.oldInfixExpression= oldInfixExpression;
}
@Override
public void rewriteAST(CompilationUnitRewrite cuRewrite, LinkedProposalModelCore linkedModel) throws CoreException {
String bufferOrBuilderName;
ICompilationUnit cu= cuRewrite.getCu();
AST ast= cuRewrite.getAST();
if (JavaModelUtil.is50OrHigher(cu.getJavaProject())) {
bufferOrBuilderName= "StringBuilder"; //$NON-NLS-1$
} else {
bufferOrBuilderName= "StringBuffer"; //$NON-NLS-1$
}
ASTRewrite rewrite= cuRewrite.getASTRewrite();
SimpleName existingBuffer= getEnclosingAppendBuffer(oldInfixExpression);
Statement insertAfter;
String bufferName;
String groupID= "nameId"; //$NON-NLS-1$
ListRewrite listRewrite;
Statement enclosingStatement= ASTResolving.findParentStatement(oldInfixExpression);
if (existingBuffer != null) {
if (ASTNodes.isControlStatementBody(enclosingStatement.getLocationInParent())) {
Block newBlock= ast.newBlock();
listRewrite= rewrite.getListRewrite(newBlock, Block.STATEMENTS_PROPERTY);
insertAfter= null;
rewrite.replace(enclosingStatement, newBlock, null);
} else {
listRewrite= rewrite.getListRewrite(enclosingStatement.getParent(), (ChildListPropertyDescriptor) enclosingStatement.getLocationInParent());
insertAfter= enclosingStatement;
}
bufferName= existingBuffer.getIdentifier();
} else {
// create buffer
VariableDeclarationFragment frag= ast.newVariableDeclarationFragment();
// check if name is already in use and provide alternative
List<String> fExcludedVariableNames= Arrays.asList(ASTResolving.getUsedVariableNames(oldInfixExpression));
SimpleType bufferType= ast.newSimpleType(ast.newName(bufferOrBuilderName));
ClassInstanceCreation newBufferExpression= ast.newClassInstanceCreation();
String[] newBufferNames= StubUtility.getVariableNameSuggestions(NamingConventions.VK_LOCAL, cu.getJavaProject(), bufferOrBuilderName, 0, fExcludedVariableNames, true);
bufferName= newBufferNames[0];
SimpleName bufferNameDeclaration= ast.newSimpleName(bufferName);
frag.setName(bufferNameDeclaration);
LinkedProposalPositionGroupCore pg= linkedModel.getPositionGroup(groupID, true);
pg.addPosition(rewrite.track(bufferNameDeclaration), true);
for (String newBufferName : newBufferNames) {
pg.addProposal(newBufferName, 10);
}
newBufferExpression.setType(bufferType);
frag.setInitializer(newBufferExpression);
VariableDeclarationStatement bufferDeclaration= ast.newVariableDeclarationStatement(frag);
bufferDeclaration.setType(ast.newSimpleType(ast.newName(bufferOrBuilderName)));
insertAfter= bufferDeclaration;
Statement statement= ASTResolving.findParentStatement(oldInfixExpression);
if (ASTNodes.isControlStatementBody(statement.getLocationInParent())) {
Block newBlock= ast.newBlock();
listRewrite= rewrite.getListRewrite(newBlock, Block.STATEMENTS_PROPERTY);
listRewrite.insertFirst(bufferDeclaration, null);
listRewrite.insertLast(rewrite.createMoveTarget(statement), null);
rewrite.replace(statement, newBlock, null);
} else {
listRewrite= rewrite.getListRewrite(statement.getParent(), (ChildListPropertyDescriptor) statement.getLocationInParent());
listRewrite.insertBefore(bufferDeclaration, statement, null);
}
}
List<Expression> operands= new ArrayList<>();
collectInfixPlusOperands(oldInfixExpression, operands);
Statement lastAppend= insertAfter;
for (Expression operand : operands) {
MethodInvocation appendIncovationExpression= ast.newMethodInvocation();
appendIncovationExpression.setName(ast.newSimpleName("append")); //$NON-NLS-1$
SimpleName bufferNameReference= ast.newSimpleName(bufferName);
// If there was an existing name, don't offer to rename it
if (existingBuffer == null) {
linkedModel.getPositionGroup(groupID, true).addPosition(rewrite.track(bufferNameReference), true);
}
appendIncovationExpression.setExpression(bufferNameReference);
appendIncovationExpression.arguments().add(rewrite.createCopyTarget(operand));
ExpressionStatement appendExpressionStatement= ast.newExpressionStatement(appendIncovationExpression);
if (lastAppend == null) {
listRewrite.insertFirst(appendExpressionStatement, null);
} else {
listRewrite.insertAfter(appendExpressionStatement, lastAppend, null);
}
lastAppend= appendExpressionStatement;
}
if (existingBuffer != null) {
linkedModel.setEndPosition(rewrite.track(lastAppend));
if (insertAfter != null) {
rewrite.remove(enclosingStatement, null);
}
} else {
// replace old expression with toString
MethodInvocation bufferToString= ast.newMethodInvocation();
bufferToString.setName(ast.newSimpleName("toString")); //$NON-NLS-1$
SimpleName bufferNameReference= ast.newSimpleName(bufferName);
bufferToString.setExpression(bufferNameReference);
linkedModel.getPositionGroup(groupID, true).addPosition(rewrite.track(bufferNameReference), true);
rewrite.replace(oldInfixExpression, bufferToString, null);
linkedModel.setEndPosition(rewrite.track(bufferToString));
}
}
}
}