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
|
/*
* Copyright (C) 2012 The Project Lombok Authors.
*
* 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.agent;
import static lombok.eclipse.agent.PatchExtensionMethod.*;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import lombok.eclipse.EclipseNode;
import lombok.eclipse.agent.PatchExtensionMethod.Extension;
import lombok.experimental.ExtensionMethod;
import org.eclipse.jdt.core.CompletionProposal;
import org.eclipse.jdt.internal.codeassist.InternalCompletionContext;
import org.eclipse.jdt.internal.codeassist.InternalCompletionProposal;
import org.eclipse.jdt.internal.codeassist.InternalExtendedCompletionContext;
import org.eclipse.jdt.internal.codeassist.complete.CompletionOnMemberAccess;
import org.eclipse.jdt.internal.codeassist.complete.CompletionOnQualifiedNameReference;
import org.eclipse.jdt.internal.codeassist.complete.CompletionOnSingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.FieldReference;
import org.eclipse.jdt.internal.compiler.ast.NameReference;
import org.eclipse.jdt.internal.compiler.ast.SuperReference;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.VariableBinding;
import org.eclipse.jdt.internal.core.SearchableEnvironment;
import org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal;
import org.eclipse.jdt.ui.text.java.CompletionProposalCollector;
import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
public class PatchExtensionMethodCompletionProposal {
public static IJavaCompletionProposal[] getJavaCompletionProposals(IJavaCompletionProposal[] javaCompletionProposals,
CompletionProposalCollector completionProposalCollector) {
List<IJavaCompletionProposal> proposals = new ArrayList<IJavaCompletionProposal>(Arrays.asList(javaCompletionProposals));
if (canExtendCodeAssist(proposals)) {
IJavaCompletionProposal firstProposal = proposals.get(0);
int replacementOffset = getReplacementOffset(firstProposal);
for (Extension extension : getExtensionMethods(completionProposalCollector)) {
for (MethodBinding method : extension.extensionMethods) {
ExtensionMethodCompletionProposal newProposal = new ExtensionMethodCompletionProposal(replacementOffset);
copyNameLookupAndCompletionEngine(completionProposalCollector, firstProposal, newProposal);
ASTNode node = getAssistNode(completionProposalCollector);
newProposal.setMethodBinding(method, node);
createAndAddJavaCompletionProposal(completionProposalCollector, newProposal, proposals);
}
}
}
return proposals.toArray(new IJavaCompletionProposal[proposals.size()]);
}
private static List<Extension> getExtensionMethods(CompletionProposalCollector completionProposalCollector) {
List<Extension> extensions = new ArrayList<Extension>();
ClassScope classScope = getClassScope(completionProposalCollector);
if (classScope != null) {
TypeDeclaration decl = classScope.referenceContext;
TypeBinding firstParameterType = getFirstParameterType(decl, completionProposalCollector);
for (EclipseNode typeNode = getTypeNode(decl); typeNode != null; typeNode = upToType(typeNode)) {
Annotation ann = getAnnotation(ExtensionMethod.class, typeNode);
extensions.addAll(0, getApplicableExtensionMethods(typeNode, ann, firstParameterType));
}
}
return extensions;
}
static TypeBinding getFirstParameterType(TypeDeclaration decl, CompletionProposalCollector completionProposalCollector) {
TypeBinding firstParameterType = null;
ASTNode node = getAssistNode(completionProposalCollector);
if (node == null) return null;
if (!(node instanceof CompletionOnQualifiedNameReference) && !(node instanceof CompletionOnSingleNameReference) && !(node instanceof CompletionOnMemberAccess)) return null;
// Never offer on 'super.<autocomplete>'.
if (node instanceof FieldReference && ((FieldReference)node).receiver instanceof SuperReference) return null;
if (node instanceof NameReference) {
Binding binding = ((NameReference) node).binding;
// Unremark next block to allow a 'blank' autocomplete to list any extensions that apply to the current scope, but make sure we're not in a static context first, which this doesn't do.
// Lacking good use cases, and having this particular concept be a little tricky on javac, means for now we don't support extension methods like this. this.X() will be fine, though.
/* if ((node instanceof SingleNameReference) && (((SingleNameReference) node).token.length == 0)) {
firstParameterType = decl.binding;
} else */if (binding instanceof VariableBinding) {
firstParameterType = ((VariableBinding) binding).type;
}
} else if (node instanceof FieldReference) {
firstParameterType = ((FieldReference) node).actualReceiverType;
}
return firstParameterType;
}
private static ASTNode getAssistNode(CompletionProposalCollector completionProposalCollector) {
try {
InternalCompletionContext context = (InternalCompletionContext) Reflection.contextField.get(completionProposalCollector);
InternalExtendedCompletionContext extendedContext = (InternalExtendedCompletionContext) Reflection.extendedContextField.get(context);
if (extendedContext == null) return null;
return (ASTNode) Reflection.assistNodeField.get(extendedContext);
} catch (Exception ignore) {
return null;
}
}
private static ClassScope getClassScope(CompletionProposalCollector completionProposalCollector) {
ClassScope scope = null;
try {
InternalCompletionContext context = (InternalCompletionContext) Reflection.contextField.get(completionProposalCollector);
InternalExtendedCompletionContext extendedContext = (InternalExtendedCompletionContext) Reflection.extendedContextField.get(context);
if (extendedContext != null) {
Scope assistScope = ((Scope) Reflection.assistScopeField.get(extendedContext));
if (assistScope != null) {
scope = assistScope.classScope();
}
}
} catch (IllegalAccessException ignore) {
// ignore
}
return scope;
}
private static void copyNameLookupAndCompletionEngine(CompletionProposalCollector completionProposalCollector, IJavaCompletionProposal proposal,
InternalCompletionProposal newProposal) {
try {
InternalCompletionContext context = (InternalCompletionContext) Reflection.contextField.get(completionProposalCollector);
InternalExtendedCompletionContext extendedContext = (InternalExtendedCompletionContext) Reflection.extendedContextField.get(context);
LookupEnvironment lookupEnvironment = (LookupEnvironment) Reflection.lookupEnvironmentField.get(extendedContext);
Reflection.nameLookupField.set(newProposal, ((SearchableEnvironment) lookupEnvironment.nameEnvironment).nameLookup);
Reflection.completionEngineField.set(newProposal, lookupEnvironment.typeRequestor);
} catch (IllegalAccessException ignore) {
// ignore
}
}
private static void createAndAddJavaCompletionProposal(CompletionProposalCollector completionProposalCollector, CompletionProposal newProposal,
List<IJavaCompletionProposal> proposals) {
try {
proposals.add((IJavaCompletionProposal) Reflection.createJavaCompletionProposalMethod.invoke(completionProposalCollector, newProposal));
} catch (Exception ignore) {
// ignore
}
}
private static boolean canExtendCodeAssist(List<IJavaCompletionProposal> proposals) {
return !proposals.isEmpty() && Reflection.isComplete();
}
private static int getReplacementOffset(IJavaCompletionProposal proposal) {
try {
return Reflection.replacementOffsetField.getInt(proposal);
} catch (Exception ignore) {
return 0;
}
}
static class Reflection {
public static final Field replacementOffsetField;
public static final Field contextField;
public static final Field extendedContextField;
public static final Field assistNodeField;
public static final Field assistScopeField;
public static final Field lookupEnvironmentField;
public static final Field completionEngineField;
public static final Field nameLookupField;
public static final Method createJavaCompletionProposalMethod;
static {
replacementOffsetField = accessField(AbstractJavaCompletionProposal.class, "fReplacementOffset");
contextField = accessField(CompletionProposalCollector.class, "fContext");
extendedContextField = accessField(InternalCompletionContext.class, "extendedContext");
assistNodeField = accessField(InternalExtendedCompletionContext.class, "assistNode");
assistScopeField = accessField(InternalExtendedCompletionContext.class, "assistScope");
lookupEnvironmentField = accessField(InternalExtendedCompletionContext.class, "lookupEnvironment");
completionEngineField = accessField(InternalCompletionProposal.class, "completionEngine");
nameLookupField = accessField(InternalCompletionProposal.class, "nameLookup");
createJavaCompletionProposalMethod = accessMethod(CompletionProposalCollector.class, "createJavaCompletionProposal", CompletionProposal.class);
}
static boolean isComplete() {
Object[] requiredFieldsAndMethods = { replacementOffsetField, contextField, extendedContextField, assistNodeField, assistScopeField, lookupEnvironmentField, completionEngineField, nameLookupField, createJavaCompletionProposalMethod };
for (Object o : requiredFieldsAndMethods) if (o == null) return false;
return true;
}
private static Field accessField(Class<?> clazz, String fieldName) {
try {
return makeAccessible(clazz.getDeclaredField(fieldName));
} catch (Exception e) {
return null;
}
}
private static Method accessMethod(Class<?> clazz, String methodName, Class<?> parameter) {
try {
return makeAccessible(clazz.getDeclaredMethod(methodName, parameter));
} catch (Exception e) {
return null;
}
}
private static <T extends AccessibleObject> T makeAccessible(T object) {
object.setAccessible(true);
return object;
}
}
}
|
