[AutoDetectIndent] added registry flag to switch between formatter-based and document-based detector

platform/lang-impl/src/com/intellij/psi/codeStyle/autodetect/IndentOptionsDetectorImpl.java

@@ -19,6 +19,7 @@ import com.intellij.lang.Language;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.editor.Document;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.registry.Registry;
 import com.intellij.psi.PsiDocumentManager;
 import com.intellij.psi.PsiFile;
 import com.intellij.psi.codeStyle.CodeStyleSettingsManager;
@@ -38,12 +39,14 @@ public class IndentOptionsDetectorImpl implements IndentOptionsDetector {
   private final Project myProject;
   private final Document myDocument;
   private final Language myLanguage;
+  private final boolean myUseFormatterBasedLineIndentBuilder;
 
   public IndentOptionsDetectorImpl(@NotNull PsiFile file) {
     myFile = file;
     myLanguage = file.getLanguage();
     myProject = file.getProject();
     myDocument = PsiDocumentManager.getInstance(myProject).getDocument(myFile);
+    myUseFormatterBasedLineIndentBuilder = Registry.is("editor.detect.indent.by.formatter");
   }
 
   @Override
@@ -51,17 +54,27 @@ public class IndentOptionsDetectorImpl implements IndentOptionsDetector {
   public IndentOptions getIndentOptions() {
     IndentOptions indentOptions = (IndentOptions)CodeStyleSettingsManager.getSettings(myProject).getIndentOptions(myFile.getFileType()).clone();
 
-    if (myDocument != null) {
-      List<LineIndentInfo> linesInfo = new FormatterBasedLineIndentInfoBuilder(myFile).build();
-      if (linesInfo != null) {
-        IndentUsageStatistics stats = new IndentUsageStatisticsImpl(linesInfo);
-        adjustIndentOptions(indentOptions, stats);
-      }
+    long start = System.currentTimeMillis();
+    List<LineIndentInfo> linesInfo = calcLineIndentInfo();
+    long end = System.currentTimeMillis();
+    LOG.info("Formatter-based: " + myUseFormatterBasedLineIndentBuilder + ". Line info building time: " + (end - start));
+
+    if (linesInfo != null) {
+      IndentUsageStatistics stats = new IndentUsageStatisticsImpl(linesInfo);
+      adjustIndentOptions(indentOptions, stats);
     }
 
     return indentOptions;
   }
 
+  private List<LineIndentInfo> calcLineIndentInfo() {
+    if (myDocument == null) return null;
+    if (myUseFormatterBasedLineIndentBuilder) {
+      return new FormatterBasedLineIndentInfoBuilder(myFile).build();
+    }
+    return new LineIndentInfoBuilder(myDocument.getCharsSequence(), myLanguage).build();
+  }
+
   private void adjustIndentOptions(@NotNull IndentOptions indentOptions, @NotNull IndentUsageStatistics stats) {
     int linesWithTabs = stats.getTotalLinesWithLeadingTabs();
     int linesWithWhiteSpaceIndent = stats.getTotalLinesWithLeadingSpaces();

platform/util/resources/misc/registry.properties

@@ -608,3 +608,5 @@ tfs.set.connection.timeout=false
 ide.mac.yosemite.laf=false
 ide.mac.yosemite.laf.restartRequired=true
 ide.mac.yosemite.laf.description=Replaces Aqua LaF to enhanced IntelliJ LaF
+
+editor.detect.indent.by.formatter=false