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
|
/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.codeInsight.daemon.impl.quickfix;
import com.intellij.codeInsight.FileModificationService;
import com.intellij.codeInsight.daemon.QuickFixBundle;
import com.intellij.codeInsight.intention.PsiElementBaseIntentionAction;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.controlFlow.*;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author ven
*/
public class RemoveRedundantElseAction extends PsiElementBaseIntentionAction {
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.daemon.impl.quickfix.RemoveRedundantElseAction");
@Override
@NotNull
public String getText() {
return QuickFixBundle.message("remove.redundant.else.fix");
}
@Override
@NotNull
public String getFamilyName() {
return QuickFixBundle.message("remove.redundant.else.fix");
}
@Override
public boolean isAvailable(@NotNull Project project, Editor editor, @NotNull PsiElement element) {
if (element instanceof PsiKeyword &&
element.getParent() instanceof PsiIfStatement &&
PsiKeyword.ELSE.equals(element.getText())) {
PsiIfStatement ifStatement = (PsiIfStatement)element.getParent();
if (ifStatement.getElseBranch() == null) return false;
PsiStatement thenBranch = ifStatement.getThenBranch();
if (thenBranch == null) return false;
PsiElement block = PsiTreeUtil.getParentOfType(ifStatement, PsiCodeBlock.class);
if (block != null) {
while (cantCompleteNormally(thenBranch, block)) {
thenBranch = getPrevThenBranch(thenBranch);
if (thenBranch == null) return true;
}
return false;
}
}
return false;
}
@Nullable
private static PsiStatement getPrevThenBranch(@NotNull PsiElement thenBranch) {
final PsiElement ifStatement = thenBranch.getParent();
final PsiElement parent = ifStatement.getParent();
if (parent instanceof PsiIfStatement && ((PsiIfStatement)parent).getElseBranch() == ifStatement) {
return ((PsiIfStatement)parent).getThenBranch();
}
return null;
}
private static boolean cantCompleteNormally(@NotNull PsiStatement thenBranch, PsiElement block) {
try {
ControlFlow controlFlow = ControlFlowFactory.getInstance(thenBranch.getProject()).getControlFlow(block, LocalsOrMyInstanceFieldsControlFlowPolicy.getInstance());
int startOffset = controlFlow.getStartOffset(thenBranch);
int endOffset = controlFlow.getEndOffset(thenBranch);
return startOffset != -1 && endOffset != -1 && !ControlFlowUtil.canCompleteNormally(controlFlow, startOffset, endOffset);
}
catch (AnalysisCanceledException e) {
return false;
}
}
@Override
public void invoke(@NotNull Project project, Editor editor, @NotNull PsiElement element) throws IncorrectOperationException {
if (!FileModificationService.getInstance().preparePsiElementForWrite(element)) return;
PsiIfStatement ifStatement = (PsiIfStatement)element.getParent();
LOG.assertTrue(ifStatement != null && ifStatement.getElseBranch() != null);
PsiStatement elseBranch = ifStatement.getElseBranch();
if (elseBranch instanceof PsiBlockStatement) {
PsiElement[] statements = ((PsiBlockStatement)elseBranch).getCodeBlock().getStatements();
if (statements.length > 0) {
ifStatement.getParent().addRangeAfter(statements[0], statements[statements.length-1], ifStatement);
}
} else {
ifStatement.getParent().addAfter(elseBranch, ifStatement);
}
ifStatement.getElseBranch().delete();
}
}
|
