| /* |
| * 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.intellij.psi.tree.TokenSet; |
| import com.jetbrains.python.PyBundle; |
| import com.jetbrains.python.PyTokenTypes; |
| import com.jetbrains.python.inspections.quickfix.AugmentedAssignmentQuickFix; |
| import com.jetbrains.python.psi.*; |
| import com.jetbrains.python.psi.impl.PyBuiltinCache; |
| import com.jetbrains.python.psi.types.PyType; |
| import com.jetbrains.python.psi.types.PyTypeChecker; |
| import org.jetbrains.annotations.Nls; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * User: catherine |
| * |
| * Inspection to detect assignments that can be replaced with augmented assignments. |
| */ |
| public class PyAugmentAssignmentInspection extends PyInspection { |
| @Nls |
| @NotNull |
| @Override |
| public String getDisplayName() { |
| return PyBundle.message("INSP.NAME.augment.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(final PyAssignmentStatement node) { |
| final PyExpression value = node.getAssignedValue(); |
| if (value instanceof PyBinaryExpression) { |
| final PyExpression target = node.getLeftHandSideExpression(); |
| final PyBinaryExpression expression = (PyBinaryExpression)value; |
| PyExpression leftExpression = expression.getLeftExpression(); |
| PyExpression rightExpression = expression.getRightExpression(); |
| |
| if (rightExpression instanceof PyParenthesizedExpression) { |
| rightExpression = ((PyParenthesizedExpression)rightExpression).getContainedExpression(); |
| } |
| if (rightExpression == null || target == null) { |
| return; |
| } |
| boolean changedParts = false; |
| final String targetText = target.getText(); |
| final String rightText = rightExpression.getText(); |
| if (rightText.equals(targetText)) { |
| final PyExpression tmp = rightExpression; |
| rightExpression = leftExpression; |
| leftExpression = tmp; |
| changedParts = true; |
| } |
| |
| final PyElementType op = expression.getOperator(); |
| final TokenSet operations = TokenSet.create(PyTokenTypes.PLUS, PyTokenTypes.MINUS, PyTokenTypes.MULT, |
| PyTokenTypes.FLOORDIV, PyTokenTypes.DIV, PyTokenTypes.PERC, PyTokenTypes.AND, |
| PyTokenTypes.OR, PyTokenTypes.XOR, PyTokenTypes.LTLT, PyTokenTypes.GTGT, |
| PyTokenTypes.EXP); |
| final TokenSet commutativeOperations = TokenSet.create(PyTokenTypes.PLUS, PyTokenTypes.MULT, PyTokenTypes.OR, PyTokenTypes.AND); |
| if ((operations.contains(op) && !changedParts) || (changedParts && commutativeOperations.contains(op))) { |
| if (leftExpression.getText().equals(targetText) && (leftExpression instanceof PyReferenceExpression || leftExpression instanceof PySubscriptionExpression)) { |
| final PyType type = myTypeEvalContext.getType(rightExpression); |
| if (type != null && !PyTypeChecker.isUnknown(type)) { |
| final PyBuiltinCache cache = PyBuiltinCache.getInstance(rightExpression); |
| final LanguageLevel languageLevel = LanguageLevel.forElement(rightExpression); |
| if (isNumeric(type, cache) || (isString(type, cache, languageLevel) && !changedParts)) { |
| registerProblem(node, "Assignment can be replaced with augmented assignment", new AugmentedAssignmentQuickFix()); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| private boolean isString(PyType type, PyBuiltinCache cache, LanguageLevel level) { |
| return PyTypeChecker.match(cache.getStringType(level), type, myTypeEvalContext); |
| } |
| |
| private boolean isNumeric(PyType type, PyBuiltinCache cache) { |
| return PyTypeChecker.match(cache.getComplexType(), type, myTypeEvalContext); |
| } |
| } |
| } |