python/src/com/jetbrains/python/codeInsight/highlighting/PyHighlightExitPointsHandlerFactory.java


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

/*
 * Copyright 2000-2013 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.codeInsight.highlighting;

import com.intellij.codeInsight.TargetElementUtilBase;
import com.intellij.codeInsight.highlighting.HighlightUsagesHandlerBase;
import com.intellij.codeInsight.highlighting.HighlightUsagesHandlerFactory;
import com.intellij.openapi.editor.Editor;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.util.PsiTreeUtil;
import com.jetbrains.python.psi.PyExpression;
import com.jetbrains.python.psi.PyReturnStatement;

/**
 * @author oleg
 */
public class PyHighlightExitPointsHandlerFactory implements HighlightUsagesHandlerFactory {
  public HighlightUsagesHandlerBase createHighlightUsagesHandler(final Editor editor, final PsiFile file) {
    int offset = TargetElementUtilBase.adjustOffset(file, editor.getDocument(), editor.getCaretModel().getOffset());
    PsiElement target = file.findElementAt(offset);
    if (target != null) {
      final PyReturnStatement returnStatement = PsiTreeUtil.getParentOfType(target, PyReturnStatement.class);
      if (returnStatement != null) {
        final PyExpression returnExpr = returnStatement.getExpression();
        if (returnExpr == null || !PsiTreeUtil.isAncestor(returnExpr, target, false)) {
          return new PyHighlightExitPointsHandler(editor, file, target);
        }
      }
    }
    return null;
  }
}