| /* |
| * 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.psi.*; |
| import com.jetbrains.python.psi.types.PyTupleType; |
| import com.jetbrains.python.psi.types.PyType; |
| import org.jetbrains.annotations.Nls; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * @author Alexey.Ivanov |
| */ |
| public class PyTupleAssignmentBalanceInspection extends PyInspection { |
| @Nls |
| @NotNull |
| @Override |
| public String getDisplayName() { |
| return PyBundle.message("INSP.NAME.incorrect.assignment"); |
| } |
| |
| @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 visitPyAssignmentStatement(PyAssignmentStatement node) { |
| PyExpression lhsExpression = node.getLeftHandSideExpression(); |
| PyExpression assignedValue = node.getAssignedValue(); |
| if (lhsExpression instanceof PyParenthesizedExpression) // PY-4360 |
| lhsExpression = ((PyParenthesizedExpression)lhsExpression).getContainedExpression(); |
| |
| if (assignedValue == null) return; |
| PyType type = myTypeEvalContext.getType(assignedValue); |
| if (assignedValue instanceof PyReferenceExpression && !(type instanceof PyTupleType)) return; |
| if (lhsExpression instanceof PyTupleExpression && type != null) { |
| int valuesLength = PyUtil.getElementsCount(assignedValue, myTypeEvalContext); |
| if (valuesLength == -1) return; |
| PyExpression[] elements = ((PyTupleExpression) lhsExpression).getElements(); |
| |
| boolean containsStarExpression = false; |
| if (LanguageLevel.forElement(node).isPy3K()) { |
| for (PyExpression target: elements) { |
| if (target instanceof PyStarExpression) { |
| if (containsStarExpression) { |
| registerProblem(target, "Only one starred expression allowed in assignment"); |
| return; |
| } |
| containsStarExpression = true; |
| ++valuesLength; |
| } |
| } |
| } |
| |
| int targetsLength = elements.length; |
| if (targetsLength > valuesLength) { |
| registerProblem(assignedValue, "Need more values to unpack"); |
| } else if (!containsStarExpression && targetsLength < valuesLength) { |
| registerProblem(assignedValue, "Too many values to unpack"); |
| } |
| } |
| } |
| } |
| } |