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
|
/*
* Copyright 2000-2014 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.editorActions;
import com.intellij.codeInsight.CodeInsightSettings;
import com.intellij.codeStyle.CodeStyleFacade;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.LogicalPosition;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.LanguageCodeStyleSettingsProvider;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
/**
* Makes Backspace action delete all whitespace till next valid indent position
*/
public class IndentingBackspaceHandler extends BackspaceHandlerDelegate {
private static final Logger LOG = Logger.getInstance(IndentingBackspaceHandler.class);
private boolean caretWasAtLineStart;
@Override
public void beforeCharDeleted(char c, PsiFile file, Editor editor) {
caretWasAtLineStart = editor.getCaretModel().getLogicalPosition().column == 0;
}
@Override
public boolean charDeleted(char c, PsiFile file, Editor editor) {
if (CodeInsightSettings.getInstance().SMART_BACKSPACE != CodeInsightSettings.AUTOINDENT || !StringUtil.isWhiteSpace(c)) {
return false;
}
LanguageCodeStyleSettingsProvider codeStyleSettingsProvider = LanguageCodeStyleSettingsProvider.forLanguage(file.getLanguage());
if (codeStyleSettingsProvider != null && codeStyleSettingsProvider.isIndentBasedLanguageSemantics()) {
return false;
}
Document document = editor.getDocument();
int caretOffset = editor.getCaretModel().getOffset();
int offset = CharArrayUtil.shiftForward(document.getCharsSequence(), caretOffset, " \t");
int beforeWhitespaceOffset = CharArrayUtil.shiftBackward(document.getCharsSequence(), offset - 1, " \t") + 1;
LogicalPosition logicalPosition = caretOffset < offset ? editor.offsetToLogicalPosition(offset) : editor.getCaretModel().getLogicalPosition();
int lineStartOffset = document.getLineStartOffset(logicalPosition.line);
if (lineStartOffset < beforeWhitespaceOffset) {
if (caretWasAtLineStart && beforeWhitespaceOffset < offset) {
document.deleteString(beforeWhitespaceOffset, offset);
return true;
}
return false;
}
CodeStyleFacade codeStyleFacade = CodeStyleFacade.getInstance(editor.getProject());
String indent = codeStyleFacade.getLineIndent(document, lineStartOffset);
if (indent == null) {
return false;
}
int tabSize = getTabSize(codeStyleFacade, document);
int targetColumn = getWidth(indent, tabSize);
if (logicalPosition.column == targetColumn) {
if (caretOffset < offset) {
editor.getCaretModel().moveToLogicalPosition(logicalPosition);
return true;
}
return false;
}
if (caretWasAtLineStart || logicalPosition.column > targetColumn) {
document.replaceString(lineStartOffset, offset, indent);
editor.getCaretModel().moveToLogicalPosition(new LogicalPosition(logicalPosition.line, targetColumn));
return true;
}
if (logicalPosition.line == 0) {
return false;
}
int prevLineStartOffset = document.getLineStartOffset(logicalPosition.line - 1);
int prevLineEndOffset = document.getLineEndOffset(logicalPosition.line - 1);
int targetOffset = CharArrayUtil.shiftBackward(document.getCharsSequence(), prevLineEndOffset - 1, " \t") + 1;
if (prevLineStartOffset < targetOffset) {
document.deleteString(targetOffset, offset);
editor.getCaretModel().moveToOffset(targetOffset);
}
else {
document.replaceString(prevLineStartOffset, offset, indent);
editor.getCaretModel().moveToLogicalPosition(new LogicalPosition(logicalPosition.line - 1, targetColumn));
}
return true;
}
private static int getTabSize(@NotNull CodeStyleFacade codeStyleFacade, @NotNull Document document) {
VirtualFile file = FileDocumentManager.getInstance().getFile(document);
FileType fileType = file == null ? null : file.getFileType();
return codeStyleFacade.getTabSize(fileType);
}
private static int getWidth(@NotNull String indent, int tabSize) {
int width = 0;
for (int i = 0; i < indent.length(); i++) {
char c = indent.charAt(i);
switch (c) {
case '\t':
width = tabSize * (width / tabSize + 1);
break;
default:
LOG.error("Unexpected whitespace character: " + ((int)c));
case ' ':
width++;
}
}
return width;
}
}
|
