python/src/com/jetbrains/python/inspections/PyDecoratorInspection.java

/*
 * 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.inspections;

import com.intellij.codeInspection.LocalInspectionToolSession;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.psi.PsiElementVisitor;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.inspections.quickfix.RemoveDecoratorQuickFix;
import com.jetbrains.python.psi.PyClass;
import com.jetbrains.python.psi.PyDecorator;
import com.jetbrains.python.psi.PyDecoratorList;
import com.jetbrains.python.psi.PyFunction;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * User: catherine
 *
 * Inspection to detect occurrences of @classmethod and @staticmethod
 * on methods outside of a class
 */
public class PyDecoratorInspection extends PyInspection {
  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return PyBundle.message("INSP.NAME.decorator.outside.class");
  }

  @NotNull
  @Override
  public PsiElementVisitor buildVisitor(@NotNull ProblemsHolder holder,
                                        boolean isOnTheFly,
                                        @NotNull LocalInspectionToolSession session) {
    return new Visitor(holder, session);
  }

  private static class Visitor extends PyInspectionVisitor {
    public Visitor(@Nullable ProblemsHolder holder, @NotNull LocalInspectionToolSession session) {
      super(holder, session);
    }

    @Override
    public void visitPyFunction(final PyFunction node){
      PyClass containingClass = node.getContainingClass();
      if (containingClass != null)
        return;

      PyDecoratorList decorators = node.getDecoratorList();
      if (decorators == null)
        return;
      for (PyDecorator decorator : decorators.getDecorators()) {
        String name = decorator.getText();
        if (name.equals("@classmethod") || name.equals("@staticmethod"))
          registerProblem(decorator, "Decorator " + name + " on method outside class", new RemoveDecoratorQuickFix());
      }
    }
  }
}