python/src/com/jetbrains/python/psi/impl/PyAnnotationImpl.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
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66

/*
 * 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.psi.impl;

import com.intellij.lang.ASTNode;
import com.jetbrains.python.PyElementTypes;
import com.jetbrains.python.psi.PyAnnotation;
import com.jetbrains.python.psi.PyExpression;
import com.jetbrains.python.psi.stubs.PyAnnotationStub;
import com.jetbrains.python.psi.types.PyClassLikeType;
import com.jetbrains.python.psi.types.PyNoneType;
import com.jetbrains.python.psi.types.PyType;
import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author yole
 */
public class PyAnnotationImpl extends PyBaseElementImpl<PyAnnotationStub> implements PyAnnotation {
  public PyAnnotationImpl(ASTNode astNode) {
    super(astNode);
  }

  public PyAnnotationImpl(PyAnnotationStub stub) {
    super(stub, PyElementTypes.ANNOTATION);
  }

  @Nullable
  @Override
  public PyExpression getValue() {
    return findChildByClass(PyExpression.class);
  }

  @Nullable
  @Override
  public PyType getType(@NotNull TypeEvalContext context, @NotNull TypeEvalContext.Key key) {
    final PyExpression value = getValue();
    if (value != null) {
      final PyType type = context.getType(value);
      if (type instanceof PyClassLikeType) {
        final PyClassLikeType classType = (PyClassLikeType)type;
        if (classType.isDefinition()) {
          return classType.toInstance();
        }
      }
      else if (type instanceof PyNoneType) {
        return type;
      }
    }
    return null;
  }
}