blob: b2c5aa87a3fbc111dfc01517f9afacd39981acbd (
plain)
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
|
/*
* Copyright 2003-2012 Dave Griffith
*
* 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.ipp.trivialif;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import com.siyeh.ig.psiutils.EquivalenceChecker;
import com.siyeh.ipp.base.PsiElementPredicate;
import com.siyeh.ipp.psiutils.ControlFlowUtils;
import com.siyeh.ipp.psiutils.ErrorUtil;
class MergeIfOrPredicate implements PsiElementPredicate {
public boolean satisfiedBy(PsiElement element) {
return isMergableExplicitIf(element) || isMergableImplicitIf(element);
}
public static boolean isMergableExplicitIf(PsiElement element) {
if (!(element instanceof PsiJavaToken)) {
return false;
}
final PsiJavaToken token = (PsiJavaToken)element;
final PsiElement parent = token.getParent();
if (!(parent instanceof PsiIfStatement)) {
return false;
}
final PsiIfStatement ifStatement = (PsiIfStatement)parent;
final PsiStatement thenBranch = ifStatement.getThenBranch();
final PsiStatement elseBranch = ifStatement.getElseBranch();
if (thenBranch == null) {
return false;
}
if (elseBranch == null) {
return false;
}
if (!(elseBranch instanceof PsiIfStatement)) {
return false;
}
if (ErrorUtil.containsError(ifStatement)) {
return false;
}
final PsiIfStatement childIfStatement = (PsiIfStatement)elseBranch;
final PsiStatement childThenBranch = childIfStatement.getThenBranch();
return EquivalenceChecker.statementsAreEquivalent(thenBranch, childThenBranch);
}
private static boolean isMergableImplicitIf(PsiElement element) {
if (!(element instanceof PsiJavaToken)) {
return false;
}
final PsiJavaToken token = (PsiJavaToken)element;
final PsiElement parent = token.getParent();
if (!(parent instanceof PsiIfStatement)) {
return false;
}
final PsiIfStatement ifStatement = (PsiIfStatement)parent;
final PsiStatement thenBranch = ifStatement.getThenBranch();
if (thenBranch == null) {
return false;
}
final PsiStatement elseBranch = ifStatement.getElseBranch();
if (elseBranch != null) {
return false;
}
if (ControlFlowUtils.statementMayCompleteNormally(thenBranch)) {
return false;
}
final PsiElement nextStatement = PsiTreeUtil.skipSiblingsForward(ifStatement, PsiWhiteSpace.class);
if (!(nextStatement instanceof PsiIfStatement)) {
return false;
}
final PsiIfStatement nextIfStatement = (PsiIfStatement)nextStatement;
final PsiStatement nextThenBranch = nextIfStatement.getThenBranch();
return EquivalenceChecker.statementsAreEquivalent(thenBranch, nextThenBranch);
}
}
|
