python/src/com/jetbrains/python/inspections/quickfix/CompatibilityPrintCallQuickFix.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.quickfix;

import com.intellij.codeInspection.LocalQuickFix;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.Function;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NotNull;

/**
 * User: catherine
 *
 * QuickFix to replace statement that has no effect with function call
 */
public class CompatibilityPrintCallQuickFix implements LocalQuickFix {
  @NotNull
  public String getName() {
    return PyBundle.message("QFIX.statement.effect");
  }

  @NotNull
  public String getFamilyName() {
    return getName();
  }

  public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
    PsiElement expression = descriptor.getPsiElement();
    PyElementGenerator elementGenerator = PyElementGenerator.getInstance(project);
    replacePrint(expression, elementGenerator);
  }

  private static void replacePrint(PsiElement expression, PyElementGenerator elementGenerator) {
    final StringBuilder stringBuilder = new StringBuilder("print(");
    final PyFile file = (PyFile)expression.getContainingFile();
    final PyExpression[] target = PsiTreeUtil.getChildrenOfType(expression, PyExpression.class);
    if (target != null) {
      stringBuilder.append(StringUtil.join(target, new Function<PyExpression, String>() {
        @Override
        public String fun(PyExpression o) {
          return o.getText();
        }
      }, ", "));
    }
    stringBuilder.append(")");
    expression.replace(elementGenerator.createFromText(LanguageLevel.forElement(expression), PyExpression.class,
                                                       stringBuilder.toString()));

    final PyFromImportStatement statement = elementGenerator.createFromText(LanguageLevel.forElement(expression), PyFromImportStatement.class,
                                                                      "from __future__ import print_function");
    file.addBefore(statement, file.getStatements().get(0));
  }
}