java/debugger/impl/src/com/intellij/debugger/impl/DebuggerContextUtil.java

/*
 * 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.debugger.impl;

import com.intellij.codeInsight.daemon.impl.IdentifierHighlighterPass;
import com.intellij.debugger.SourcePosition;
import com.intellij.debugger.engine.SuspendContextImpl;
import com.intellij.debugger.engine.SuspendManagerUtil;
import com.intellij.debugger.jdi.StackFrameProxyImpl;
import com.intellij.debugger.ui.impl.watch.ThreadDescriptorImpl;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl;
import com.intellij.openapi.util.Couple;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.xdebugger.XDebugSession;
import com.intellij.xdebugger.XSourcePosition;
import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class DebuggerContextUtil {
  public static void setStackFrame(DebuggerStateManager manager, final StackFrameProxyImpl stackFrame) {
    ApplicationManager.getApplication().assertIsDispatchThread();
    final DebuggerContextImpl context = manager.getContext();
    if(context == null) {
      return;
    }

    final DebuggerSession session = context.getDebuggerSession();
    SuspendContextImpl threadSuspendContext = SuspendManagerUtil.getSuspendContextForThread(context.getSuspendContext(), stackFrame.threadProxy());
    final DebuggerContextImpl newContext = DebuggerContextImpl.createDebuggerContext(session, threadSuspendContext, stackFrame.threadProxy(), stackFrame);

    manager.setState(newContext, session != null? session.getState() : DebuggerSession.STATE_DISPOSED, DebuggerSession.EVENT_REFRESH, null);
  }

  public static void setThread(DebuggerStateManager contextManager, ThreadDescriptorImpl item) {
    ApplicationManager.getApplication().assertIsDispatchThread();
    final DebuggerContextImpl context = contextManager.getContext();
    if(context == null) {
      return;
    }

    final DebuggerSession session = context.getDebuggerSession();
    final DebuggerContextImpl newContext = DebuggerContextImpl.createDebuggerContext(session, item.getSuspendContext(), item.getThreadReference(), null);

    contextManager.setState(newContext, session != null? session.getState() : DebuggerSession.STATE_DISPOSED, DebuggerSession.EVENT_CONTEXT, null);
  }

  public static DebuggerContextImpl createDebuggerContext(@NotNull DebuggerSession session, SuspendContextImpl suspendContext){
    return DebuggerContextImpl.createDebuggerContext(session, suspendContext, suspendContext != null ? suspendContext.getThread() : null, null);
  }

  public static SourcePosition findNearest(@NotNull DebuggerContextImpl context, @NotNull PsiElement psi, @NotNull PsiFile file) {
    final DebuggerSession session = context.getDebuggerSession();
    if (session != null) {
      try {
        final XDebugSession debugSession = session.getXDebugSession();
        if (debugSession != null) {
          final XSourcePosition position = debugSession.getCurrentPosition();
          Editor editor = ((FileEditorManagerImpl)FileEditorManager.getInstance(file.getProject())).getSelectedTextEditor(true);

          //final Editor editor = fileEditor instanceof TextEditorImpl ? ((TextEditorImpl)fileEditor).getEditor() : null;
          if (editor != null && position != null && file.getVirtualFile().equals(position.getFile())) {
            final Couple<Collection<TextRange>> usages = IdentifierHighlighterPass.getHighlightUsages(psi, file);
            final List<TextRange> ranges = new ArrayList<TextRange>();
            ranges.addAll(usages.first);
            ranges.addAll(usages.second);
            final int breakPointLine = position.getLine();
            int bestLine = -1;
            boolean hasSameLine = false;
            for (TextRange range : ranges) {
              final int line = editor.offsetToLogicalPosition(range.getStartOffset()).line;
              if (line > bestLine && line < breakPointLine) {
                bestLine = line;
              } else if (line == breakPointLine) {
                hasSameLine = true;
              }
            }
            if (bestLine > 0) {
              if (hasSameLine && breakPointLine - bestLine > 4) {
                return SourcePosition.createFromLine(file, breakPointLine);
              }
              return SourcePosition.createFromLine(file, bestLine);
            }
          }
        }
      }
      catch (Exception ignore) {
      }
    }
    return SourcePosition.createFromOffset(file, psi.getTextOffset());
  }
}