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
|
/*
* Copyright 2003-2014 Dave Griffith, Bas Leijdekkers
*
* 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.siyeh.ig.dataflow;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import com.siyeh.ig.psiutils.ParenthesesUtils;
import com.siyeh.ig.psiutils.PsiElementOrderComparator;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Arrays;
class ScopeUtils {
private ScopeUtils() {}
@Nullable
public static PsiElement findTighterDeclarationLocation(@NotNull PsiElement sibling, @NotNull PsiVariable variable) {
PsiElement prevSibling = sibling.getPrevSibling();
while (prevSibling instanceof PsiWhiteSpace || prevSibling instanceof PsiComment) {
prevSibling = prevSibling.getPrevSibling();
}
if (prevSibling instanceof PsiDeclarationStatement) {
if (prevSibling.equals(variable.getParent())) {
return null;
}
return findTighterDeclarationLocation(prevSibling, variable);
}
return prevSibling;
}
@Nullable
public static PsiElement getChildWhichContainsElement(@NotNull PsiElement ancestor, @NotNull PsiElement element) {
PsiElement child = element;
PsiElement parent = child.getParent();
while (!parent.equals(ancestor)) {
child = parent;
parent = child.getParent();
if (parent == null) {
return null;
}
}
return child;
}
@Nullable
public static PsiElement getCommonParent(@NotNull PsiElement[] referenceElements) {
Arrays.sort(referenceElements, PsiElementOrderComparator.getInstance());
PsiElement commonParent = null;
for (PsiElement referenceElement : referenceElements) {
final PsiElement parent = PsiTreeUtil.getParentOfType(referenceElement, PsiCodeBlock.class, PsiForStatement.class);
if (parent != null && commonParent != null) {
if (!commonParent.equals(parent)) {
commonParent = PsiTreeUtil.findCommonParent(commonParent, parent);
commonParent = PsiTreeUtil.getNonStrictParentOfType(commonParent, PsiCodeBlock.class, PsiForStatement.class);
}
}
else {
commonParent = parent;
}
}
// make common parent may only be for-statement if first reference is
// the initialization of the for statement or the initialization is
// empty.
if (commonParent instanceof PsiForStatement) {
final PsiForStatement forStatement = (PsiForStatement)commonParent;
final PsiElement referenceElement = referenceElements[0];
final PsiStatement initialization = forStatement.getInitialization();
if (!(initialization instanceof PsiEmptyStatement)) {
if (initialization instanceof PsiExpressionStatement) {
final PsiExpressionStatement statement = (PsiExpressionStatement)initialization;
final PsiExpression expression = statement.getExpression();
if (expression instanceof PsiAssignmentExpression) {
final PsiAssignmentExpression assignmentExpression = (PsiAssignmentExpression)expression;
final PsiExpression lExpression = ParenthesesUtils.stripParentheses(assignmentExpression.getLExpression());
if (!lExpression.equals(referenceElement)) {
commonParent = PsiTreeUtil.getParentOfType(commonParent, PsiCodeBlock.class);
}
}
else {
commonParent = PsiTreeUtil.getParentOfType(commonParent, PsiCodeBlock.class);
}
}
else {
commonParent = PsiTreeUtil.getParentOfType(commonParent, PsiCodeBlock.class);
}
}
}
// common parent may not be a switch() statement to avoid narrowing
// scope to inside switch branch
if (commonParent != null) {
final PsiElement parent = commonParent.getParent();
if (parent instanceof PsiSwitchStatement) {
if (referenceElements.length > 1) {
commonParent = PsiTreeUtil.getParentOfType(parent, PsiCodeBlock.class, false);
}
else if (PsiTreeUtil.getParentOfType(referenceElements[0], PsiSwitchLabelStatement.class, true, PsiCodeBlock.class) != null) {
// reference is a switch label
commonParent = PsiTreeUtil.getParentOfType(parent, PsiCodeBlock.class, false);
}
}
}
return commonParent;
}
@Nullable
public static PsiElement moveOutOfLoopsAndClasses(@NotNull PsiElement scope, @NotNull PsiElement maxScope) {
PsiElement result = maxScope;
if (result instanceof PsiLoopStatement) {
return result;
}
while (!result.equals(scope)) {
final PsiElement element = getChildWhichContainsElement(result, scope);
if (element instanceof PsiForStatement) {
final PsiForStatement forStatement = (PsiForStatement)element;
if (forStatement.getInitialization() instanceof PsiEmptyStatement) {
return element;
}
}
if (element == null || element instanceof PsiLoopStatement || element instanceof PsiClass) {
while (result != null && !(result instanceof PsiCodeBlock)) {
result = result.getParent();
}
return result;
}
else {
result = element;
}
}
return scope;
}
}
|
