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/*
* 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.psi.codeStyle.autodetect;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.CodeStyleSettingsManager;
import org.jetbrains.annotations.NotNull;
import java.util.List;
import static com.intellij.psi.codeStyle.CommonCodeStyleSettings.*;
public class IndentOptionsDetector {
private static Logger LOG = Logger.getInstance("#com.intellij.psi.codeStyle.CommonCodeStyleSettings.IndentOptionsDetector");
private static final double RATE_THRESHOLD = 0.8;
private static final int MIN_LINES_THRESHOLD = 50;
private static final int MAX_INDENT_TO_DETECT = 8;
private final PsiFile myFile;
private final Project myProject;
private final Document myDocument;
public IndentOptionsDetector(@NotNull PsiFile file) {
myFile = file;
myProject = file.getProject();
myDocument = PsiDocumentManager.getInstance(myProject).getDocument(myFile);
}
@NotNull
public IndentOptions getIndentOptions() {
IndentOptions indentOptions = (IndentOptions)CodeStyleSettingsManager.getSettings(myProject).getIndentOptions(myFile.getFileType()).clone();
if (myDocument != null) {
List<LineIndentInfo> linesInfo = new LineIndentInfoBuilder(myDocument.getCharsSequence()).build();
IndentUsageStatistics stats = new IndentUsageStatisticsImpl(linesInfo);
adjustIndentOptions(indentOptions, stats);
}
return indentOptions;
}
private void adjustIndentOptions(@NotNull IndentOptions indentOptions, @NotNull IndentUsageStatistics stats) {
int linesWithTabs = stats.getTotalLinesWithLeadingTabs();
int linesWithWhiteSpaceIndent = stats.getTotalLinesWithLeadingSpaces();
int totalLines = linesWithTabs + linesWithWhiteSpaceIndent;
double lineWithTabsRate = (double)linesWithTabs / totalLines;
if (linesWithTabs > MIN_LINES_THRESHOLD && lineWithTabsRate > RATE_THRESHOLD) {
if (!indentOptions.USE_TAB_CHARACTER) {
indentOptions.USE_TAB_CHARACTER = true;
LOG.info("Detected tab usage in" + myFile);
}
}
else if (linesWithWhiteSpaceIndent > MIN_LINES_THRESHOLD && (1 - lineWithTabsRate) > RATE_THRESHOLD) {
int newIndentSize = getPositiveIndentSize(stats);
if (newIndentSize > 0 && indentOptions.INDENT_SIZE != newIndentSize) {
indentOptions.INDENT_SIZE = newIndentSize;
LOG.info("Detected indent size: " + newIndentSize + " for file " + myFile);
}
}
}
private static int getPositiveIndentSize(@NotNull IndentUsageStatistics stats) {
int totalIndentSizesDetected = stats.getTotalIndentSizesDetected();
if (totalIndentSizesDetected == 0) return -1;
IndentUsageInfo maxUsedIndentInfo = stats.getKMostUsedIndentInfo(0);
int maxUsedIndentSize = maxUsedIndentInfo.getIndentSize();
if (maxUsedIndentSize == 0) {
if (totalIndentSizesDetected < 1) return -1;
maxUsedIndentInfo = stats.getKMostUsedIndentInfo(1);
maxUsedIndentSize = maxUsedIndentInfo.getIndentSize();
}
if (maxUsedIndentSize <= MAX_INDENT_TO_DETECT) {
int totalUsagesWithoutZeroIndent = stats.getTotalLinesWithLeadingSpaces() - stats.getTimesIndentUsed(0);
double usageRate = (double)maxUsedIndentInfo.getTimesUsed() / totalUsagesWithoutZeroIndent;
if (usageRate > RATE_THRESHOLD) {
return maxUsedIndentSize;
}
}
return -1;
}
}
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