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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.
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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.jetbrains.python.debugger;

import com.google.common.annotations.VisibleForTesting;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.xdebugger.XSourcePosition;
import com.intellij.xdebugger.evaluation.EvaluationMode;
import com.intellij.xdebugger.evaluation.XDebuggerEditorsProvider;
import com.jetbrains.python.PythonFileType;
import com.jetbrains.python.psi.impl.PyExpressionCodeFragmentImpl;
import com.jetbrains.python.psi.impl.PyPsiUtils;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;


public class PyDebuggerEditorsProvider extends XDebuggerEditorsProvider {

  @NotNull
  @Override
  public FileType getFileType() {
    return PythonFileType.INSTANCE;
  }

  @NotNull
  @Override
  public Document createDocument(@NotNull final Project project,
                                 @NotNull String text,
                                 @Nullable final XSourcePosition sourcePosition,
                                 @NotNull EvaluationMode mode) {
    text = text.trim();
    final PyExpressionCodeFragmentImpl fragment = new PyExpressionCodeFragmentImpl(project, "fragment.py", text, true);

    // Bind to context
    final PsiElement element = getContextElement(project, sourcePosition);
    fragment.setContext(element);

    return PsiDocumentManager.getInstance(project).getDocument(fragment);
  }

  @Nullable
  @VisibleForTesting
  public static PsiElement getContextElement(final Project project, XSourcePosition sourcePosition) {
    if (sourcePosition != null) {
      final Document document = FileDocumentManager.getInstance().getDocument(sourcePosition.getFile());
      final PsiFile psiFile = PsiDocumentManager.getInstance(project).getPsiFile(document);
      if (psiFile != null) {
        int offset = sourcePosition.getOffset();
        if (offset >= 0 && offset < document.getTextLength()) {
          final int lineEndOffset = document.getLineEndOffset(document.getLineNumber(offset));
          do {
            PsiElement element = psiFile.findElementAt(offset);
            if (element != null && !(element instanceof PsiWhiteSpace || element instanceof PsiComment)) {
              return PyPsiUtils.getStatement(element);
            }
            offset = element.getTextRange().getEndOffset();
          }
          while (offset < lineEndOffset);
        }
      }
    }
    return null;
  }
}