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/*
* 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.psi.PsiElement;
import com.intellij.psi.util.PsiTreeUtil;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NotNull;
/**
* User: catherine
*
* QuickFix to replace mutable default argument. For instance,
* def foo(args=[]):
pass
* replace with:
* def foo(args=None):
if not args: args = []
pass
*/
public class PyDefaultArgumentQuickFix implements LocalQuickFix {
@Override
@NotNull
public String getName() {
return PyBundle.message("QFIX.default.argument");
}
@Override
@NotNull
public String getFamilyName() {
return getName();
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
PsiElement defaultValue = descriptor.getPsiElement();
PyNamedParameter param = PsiTreeUtil.getParentOfType(defaultValue, PyNamedParameter.class);
PyFunction function = PsiTreeUtil.getParentOfType(defaultValue, PyFunction.class);
assert param != null;
String defName = param.getName();
if (function != null) {
PyElementGenerator elementGenerator = PyElementGenerator.getInstance(project);
PyStatementList list = function.getStatementList();
PyParameterList paramList = function.getParameterList();
final StringBuilder functionText = new StringBuilder("def foo(");
int size = paramList.getParameters().length;
for (int i = 0; i != size; ++i) {
PyParameter p = paramList.getParameters()[i];
if (p == param)
functionText.append(defName).append("=None");
else
functionText.append(p.getText());
if (i != size-1)
functionText.append(", ");
}
functionText.append("):\n\tif not ").append(defName).append(":\n\t\t").append(defName).append(" = ").append(defaultValue.getText());
final PyStatement[] statements = list.getStatements();
PyStatement firstStatement = statements.length > 0 ? statements[0] : null;
PyFunction newFunction = elementGenerator.createFromText(LanguageLevel.forElement(function), PyFunction.class,
functionText.toString());
if (firstStatement == null) {
function.replace(newFunction);
}
else {
final PyStatement ifStatement = newFunction.getStatementList().getStatements()[0];
PyStringLiteralExpression docString = function.getDocStringExpression();
if (docString != null)
list.addAfter(ifStatement, firstStatement);
else {
list.addBefore(ifStatement, firstStatement);
}
paramList.replace(elementGenerator.createFromText(LanguageLevel.forElement(defaultValue),
PyFunction.class, functionText.toString()).getParameterList());
}
}
}
}
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