| /* |
| * Copyright 2006-2012 Bas Leijdekkers |
| * |
| * 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.siyeh.ipp.parenthesis; |
| |
| import com.intellij.openapi.progress.ProcessCanceledException; |
| import com.intellij.psi.*; |
| import com.intellij.psi.tree.IElementType; |
| import com.intellij.util.IncorrectOperationException; |
| import com.siyeh.ig.PsiReplacementUtil; |
| import com.siyeh.ipp.base.Intention; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| public class AddClarifyingParenthesesIntention extends Intention { |
| |
| @Override |
| @NotNull |
| protected PsiElementPredicate getElementPredicate() { |
| return new AddClarifyingParenthesesPredicate(); |
| } |
| |
| @Override |
| protected void processIntention(@NotNull PsiElement element) |
| throws IncorrectOperationException { |
| final PsiExpression expression = getTopLevelExpression(element); |
| if (expression == null) { |
| return; |
| } |
| final StringBuilder newExpression = createReplacementText(expression, new StringBuilder()); |
| final PsiElement parent = expression.getParent(); |
| if (parent instanceof PsiConditionalExpression) { |
| final PsiConditionalExpression conditionalExpression = (PsiConditionalExpression)parent; |
| final PsiExpression condition = conditionalExpression.getCondition(); |
| if (expression == condition) { |
| PsiReplacementUtil.replaceExpression(expression, '(' + newExpression.toString() + ')'); |
| return; |
| } |
| } |
| PsiReplacementUtil.replaceExpression(expression, newExpression.toString()); |
| } |
| |
| @Nullable |
| private static PsiExpression getTopLevelExpression(PsiElement element) { |
| if (!(element instanceof PsiExpression)) { |
| return null; |
| } |
| PsiExpression result = (PsiExpression)element; |
| PsiElement parent = result.getParent(); |
| while (parent instanceof PsiPolyadicExpression || parent instanceof PsiParenthesizedExpression) { |
| result = (PsiExpression)parent; |
| parent = result.getParent(); |
| } |
| return result; |
| } |
| |
| private static StringBuilder createReplacementText(@Nullable PsiExpression expression, StringBuilder out) { |
| if (expression instanceof PsiPolyadicExpression) { |
| final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)expression; |
| final IElementType tokenType = polyadicExpression.getOperationTokenType(); |
| final PsiElement parent = expression.getParent(); |
| if (parent instanceof PsiPolyadicExpression) { |
| final PsiPolyadicExpression parentPolyadicExpression = (PsiPolyadicExpression)parent; |
| final IElementType parentOperationSign = parentPolyadicExpression.getOperationTokenType(); |
| final boolean parentheses = !tokenType.equals(parentOperationSign); |
| appendText(polyadicExpression, parentheses, out); |
| } else { |
| final boolean parentheses = parent instanceof PsiConditionalExpression || parent instanceof PsiInstanceOfExpression; |
| appendText(polyadicExpression, parentheses, out); |
| } |
| } |
| else if (expression instanceof PsiParenthesizedExpression) { |
| final PsiParenthesizedExpression parenthesizedExpression = (PsiParenthesizedExpression)expression; |
| final PsiExpression unwrappedExpression = parenthesizedExpression.getExpression(); |
| final PsiElement parent = expression.getParent(); |
| if (!(parent instanceof PsiParenthesizedExpression)) { |
| out.append('('); |
| createReplacementText(unwrappedExpression, out); |
| out.append(')'); |
| } |
| else { |
| createReplacementText(unwrappedExpression, out); |
| } |
| } |
| else if (expression instanceof PsiInstanceOfExpression) { |
| final PsiInstanceOfExpression instanceofExpression = (PsiInstanceOfExpression)expression; |
| final PsiElement parent = expression.getParent(); |
| final boolean parentheses = mightBeConfusingExpression(parent); |
| appendText(instanceofExpression, parentheses, out); |
| } |
| else if (expression instanceof PsiConditionalExpression) { |
| final PsiConditionalExpression conditionalExpression = (PsiConditionalExpression)expression; |
| final PsiElement parent = expression.getParent(); |
| final boolean parentheses = mightBeConfusingExpression(parent); |
| appendText(conditionalExpression, parentheses, out); |
| } |
| else if (expression instanceof PsiAssignmentExpression) { |
| final PsiAssignmentExpression assignmentExpression = (PsiAssignmentExpression)expression; |
| final PsiElement parent = expression.getParent(); |
| final boolean parentheses = mightBeConfusingExpression(parent) && !isSimpleAssignment(assignmentExpression, parent); |
| appendText(assignmentExpression, parentheses, out); |
| } |
| else if (expression != null) { |
| out.append(expression.getText()); |
| } |
| return out; |
| } |
| |
| static boolean mightBeConfusingExpression(@Nullable PsiElement element) { |
| return element instanceof PsiPolyadicExpression || element instanceof PsiConditionalExpression || |
| element instanceof PsiInstanceOfExpression || element instanceof PsiAssignmentExpression; |
| } |
| |
| private static boolean isSimpleAssignment(PsiAssignmentExpression assignmentExpression, PsiElement parent) { |
| if (!(parent instanceof PsiAssignmentExpression)) { |
| return false; |
| } |
| final PsiAssignmentExpression parentAssignmentExpression = (PsiAssignmentExpression)parent; |
| final IElementType parentTokenType = parentAssignmentExpression.getOperationTokenType(); |
| final IElementType tokenType = assignmentExpression.getOperationTokenType(); |
| return parentTokenType.equals(tokenType); |
| } |
| |
| private static void appendText(PsiAssignmentExpression assignmentExpression, boolean parentheses, StringBuilder out) { |
| if (parentheses) { |
| out.append('('); |
| } |
| final PsiExpression lhs = assignmentExpression.getLExpression(); |
| out.append(lhs.getText()); |
| final PsiJavaToken sign = assignmentExpression.getOperationSign(); |
| out.append(sign.getText()); |
| final PsiExpression rhs = assignmentExpression.getRExpression(); |
| createReplacementText(rhs, out); |
| if (parentheses) { |
| out.append(')'); |
| } |
| } |
| |
| private static void appendText(PsiInstanceOfExpression instanceofExpression, boolean parentheses, StringBuilder out) { |
| if (parentheses) { |
| out.append('('); |
| } |
| final PsiExpression operand = instanceofExpression.getOperand(); |
| createReplacementText(operand, out); |
| out.append(" instanceof "); |
| final PsiTypeElement checkType = instanceofExpression.getCheckType(); |
| if (checkType != null) { |
| out.append(checkType.getText()); |
| } |
| if (parentheses) { |
| out.append(')'); |
| } |
| } |
| |
| private static void appendText(PsiConditionalExpression conditionalExpression, boolean parentheses, StringBuilder out) { |
| if (parentheses) { |
| out.append('('); |
| } |
| final PsiExpression condition = conditionalExpression.getCondition(); |
| createReplacementText(condition, out); |
| out.append('?'); |
| final PsiExpression thenExpression = conditionalExpression.getThenExpression(); |
| createReplacementText(thenExpression, out); |
| out.append(':'); |
| final PsiExpression elseExpression = conditionalExpression.getElseExpression(); |
| createReplacementText(elseExpression, out); |
| if (parentheses) { |
| out.append(')'); |
| } |
| } |
| |
| private static void appendText(PsiPolyadicExpression polyadicExpression, boolean parentheses, StringBuilder out) { |
| if (parentheses) { |
| out.append('('); |
| } |
| final PsiExpression[] operands = polyadicExpression.getOperands(); |
| for (PsiExpression operand : operands) { |
| if (operand == null) { |
| continue; |
| } |
| if (operand.getType() == PsiType.VOID) { |
| throw new ProcessCanceledException(); |
| } |
| if (operands.length == 1) { |
| createReplacementText(operand, out); |
| } |
| final PsiJavaToken token = polyadicExpression.getTokenBeforeOperand(operand); |
| if (token != null) { |
| final PsiElement beforeToken = token.getPrevSibling(); |
| if (beforeToken instanceof PsiWhiteSpace) { |
| out.append(beforeToken.getText()); |
| } |
| out.append(token.getText()); |
| final PsiElement afterToken = token.getNextSibling(); |
| if (afterToken instanceof PsiWhiteSpace) { |
| out.append(afterToken.getText()); |
| } |
| } |
| if (operands.length != 1) { |
| createReplacementText(operand, out); |
| } |
| } |
| if (parentheses) { |
| out.append(')'); |
| } |
| } |
| } |