/*
* Copyright 2000-2016 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.intellij.codeInsight.intention.impl;
import com.intellij.codeInsight.CodeInsightBundle;
import com.intellij.codeInsight.intention.PsiElementBaseIntentionAction;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.PsiExpressionTrimRenderer;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author Danila Ponomarenko
*/
public class ExtractIfConditionAction extends PsiElementBaseIntentionAction {
@Override
public boolean isAvailable(@NotNull Project project, Editor editor, @NotNull PsiElement element) {
final PsiIfStatement ifStatement = PsiTreeUtil.getParentOfType(element, PsiIfStatement.class);
if (ifStatement == null || ifStatement.getCondition() == null) {
return false;
}
final PsiExpression condition = ifStatement.getCondition();
if (condition == null || !(condition instanceof PsiPolyadicExpression)) {
return false;
}
final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)condition;
final PsiType expressionType = polyadicExpression.getType();
if (expressionType == null || !PsiType.BOOLEAN.isAssignableFrom(expressionType)) {
return false;
}
final IElementType operation = polyadicExpression.getOperationTokenType();
if (operation != JavaTokenType.OROR && operation != JavaTokenType.ANDAND) {
return false;
}
final PsiExpression operand = findOperand(element, polyadicExpression);
if (operand == null) {
return false;
}
setText(CodeInsightBundle.message("intention.extract.if.condition.text", PsiExpressionTrimRenderer.render(operand)));
return true;
}
@Override
public void invoke(@NotNull Project project, Editor editor, @NotNull PsiElement element) throws IncorrectOperationException {
final PsiIfStatement ifStatement = PsiTreeUtil.getParentOfType(element, PsiIfStatement.class);
if (ifStatement == null) {
return;
}
final PsiElementFactory factory = JavaPsiFacade.getInstance(project).getElementFactory();
final CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(project);
final PsiStatement newIfStatement = create(factory, ifStatement, element);
if (newIfStatement == null) {
return;
}
ifStatement.replace(codeStyleManager.reformat(newIfStatement));
}
@Nullable
private static PsiStatement create(@NotNull PsiElementFactory factory,
@NotNull PsiIfStatement ifStatement,
@NotNull PsiElement element) {
final PsiExpression condition = ifStatement.getCondition();
if (condition == null || !(condition instanceof PsiPolyadicExpression)) {
return null;
}
final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)condition;
final PsiExpression operand = findOperand(element, polyadicExpression);
if (operand == null) {
return null;
}
return create(
factory,
ifStatement.getThenBranch(), ifStatement.getElseBranch(),
operand,
removeOperand(factory, polyadicExpression, operand),
polyadicExpression.getOperationTokenType()
);
}
@NotNull
private static PsiExpression removeOperand(@NotNull PsiElementFactory factory,
@NotNull PsiPolyadicExpression expression,
@NotNull PsiExpression operand) {
final StringBuilder sb = new StringBuilder();
for (PsiExpression e : expression.getOperands()) {
if (e == operand) continue;
final PsiJavaToken token = expression.getTokenBeforeOperand(e);
if (token != null && sb.length() != 0) {
sb.append(token.getText()).append(" ");
}
sb.append(e.getText());
}
return factory.createExpressionFromText(sb.toString(), expression);
}
@Nullable
private static PsiStatement create(@NotNull PsiElementFactory factory,
@Nullable PsiStatement thenBranch,
@Nullable PsiStatement elseBranch,
@NotNull PsiExpression extract,
@NotNull PsiExpression leave,
@NotNull IElementType operation) {
if (thenBranch == null) {
return null;
}
if (operation == JavaTokenType.OROR) {
return createOrOr(factory, thenBranch, elseBranch, extract, leave);
}
if (operation == JavaTokenType.ANDAND) {
return createAndAnd(factory, thenBranch, elseBranch, extract, leave);
}
return null;
}
@NotNull
private static PsiStatement createAndAnd(@NotNull PsiElementFactory factory,
@NotNull PsiStatement thenBranch,
@Nullable PsiStatement elseBranch,
@NotNull PsiExpression extract,
@NotNull PsiExpression leave) {
return factory.createStatementFromText(
createIfString(extract,
createIfString(leave, thenBranch, elseBranch),
elseBranch
),
thenBranch
);
}
@NotNull
private static PsiStatement createOrOr(@NotNull PsiElementFactory factory,
@NotNull PsiStatement thenBranch,
@Nullable PsiStatement elseBranch,
@NotNull PsiExpression extract,
@NotNull PsiExpression leave) {
return factory.createStatementFromText(
createIfString(extract, thenBranch,
createIfString(leave, thenBranch, elseBranch)
),
thenBranch
);
}
@NotNull
private static String createIfString(@NotNull PsiExpression condition,
@NotNull PsiStatement thenBranch,
@Nullable PsiStatement elseBranch) {
return createIfString(condition.getText(), toThenBranchString(thenBranch), toElseBranchString(elseBranch, false));
}
@NotNull
private static String createIfString(@NotNull PsiExpression condition,
@NotNull PsiStatement thenBranch,
@Nullable String elseBranch) {
return createIfString(condition.getText(), toThenBranchString(thenBranch), elseBranch);
}
@NotNull
private static String createIfString(@NotNull PsiExpression condition,
@NotNull String thenBranch,
@Nullable PsiStatement elseBranch) {
return createIfString(condition.getText(), thenBranch, toElseBranchString(elseBranch, true));
}
@NotNull
private static String createIfString(@NotNull String condition,
@NotNull String thenBranch,
@Nullable String elseBranch) {
final String elsePart = elseBranch != null ? " else " + elseBranch : "";
return "if (" + condition + ")\n" + thenBranch + elsePart;
}
@NotNull
private static String toThenBranchString(@NotNull PsiStatement statement) {
if (!(statement instanceof PsiBlockStatement)) {
return "{ " + statement.getText() + " }";
}
return statement.getText();
}
@Nullable
private static String toElseBranchString(@Nullable PsiStatement statement, boolean skipElse) {
if (statement == null) {
return null;
}
if (statement instanceof PsiBlockStatement || skipElse && statement instanceof PsiIfStatement) {
return statement.getText();
}
return "{ " + statement.getText() + " }";
}
@Nullable
private static PsiExpression findOperand(@NotNull PsiElement e, @NotNull PsiPolyadicExpression expression) {
final TextRange elementTextRange = e.getTextRange();
for (PsiExpression operand : expression.getOperands()) {
final TextRange operandTextRange = operand.getTextRange();
if (operandTextRange != null && operandTextRange.contains(elementTextRange)) {
return operand;
}
}
return null;
}
@NotNull
@Override
public String getFamilyName() {
return CodeInsightBundle.message("intention.extract.if.condition.family");
}
}