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/*
* Copyright 2000-2012 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.daemon.impl.quickfix;
import com.intellij.codeInsight.FileModificationService;
import com.intellij.codeInsight.daemon.QuickFixBundle;
import com.intellij.codeInsight.intention.IntentionAction;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.PsiUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author Bas Leijdekkers
*/
public class ChangeToAppendFix implements IntentionAction {
private final IElementType myTokenType;
private final PsiType myLhsType;
private final PsiAssignmentExpression myAssignmentExpression;
public ChangeToAppendFix(IElementType eqOpSign, PsiType lType, PsiAssignmentExpression assignmentExpression) {
myTokenType = eqOpSign;
myLhsType = lType;
myAssignmentExpression = assignmentExpression;
}
@NotNull
@Override
public String getText() {
return QuickFixBundle.message("change.to.append.text",
buildAppendExpression(myAssignmentExpression.getRExpression(),
myLhsType.equalsToText("java.lang.Appendable"),
new StringBuilder(myAssignmentExpression.getLExpression().getText())));
}
@NotNull
@Override
public String getFamilyName() {
return QuickFixBundle.message("change.to.append.family");
}
@Override
public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file) {
return JavaTokenType.PLUSEQ == myTokenType &&
myAssignmentExpression.isValid() &&
PsiManager.getInstance(project).isInProject(myAssignmentExpression) &&
(myLhsType.equalsToText(CommonClassNames.JAVA_LANG_STRING_BUILDER) ||
myLhsType.equalsToText(CommonClassNames.JAVA_LANG_STRING_BUFFER) ||
myLhsType.equalsToText("java.lang.Appendable"));
}
@Override
public boolean startInWriteAction() {
return true;
}
@Override
public void invoke(@NotNull Project project, Editor editor, PsiFile file) throws IncorrectOperationException {
if (!FileModificationService.getInstance().prepareFileForWrite(file)) return;
final PsiExpression appendExpression =
buildAppendExpression(myAssignmentExpression.getLExpression(), myAssignmentExpression.getRExpression());
if (appendExpression == null) return;
myAssignmentExpression.replace(appendExpression);
}
@Nullable
public static PsiExpression buildAppendExpression(PsiExpression appendable, PsiExpression concatenation) {
if (concatenation == null) return null;
final PsiType type = appendable.getType();
if (type == null) return null;
final StringBuilder result =
buildAppendExpression(concatenation, type.equalsToText("java.lang.Appendable"), new StringBuilder(appendable.getText()));
if (result == null) return null;
final PsiElementFactory factory = JavaPsiFacade.getElementFactory(appendable.getProject());
return factory.createExpressionFromText(result.toString(), appendable);
}
@Nullable
private static StringBuilder buildAppendExpression(PsiExpression concatenation, boolean useStringValueOf, @NonNls StringBuilder out)
throws IncorrectOperationException {
final PsiType type = concatenation.getType();
if (type == null) {
return null;
}
if (concatenation instanceof PsiPolyadicExpression && type.equalsToText(CommonClassNames.JAVA_LANG_STRING)) {
PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)concatenation;
final PsiExpression[] operands = polyadicExpression.getOperands();
boolean isConstant = true;
boolean isString = false;
final StringBuilder builder = new StringBuilder();
for (PsiExpression operand : operands) {
if (isConstant && PsiUtil.isConstantExpression(operand)) {
if (builder.length() != 0) {
builder.append('+');
}
final PsiType operandType = operand.getType();
if (operandType != null && operandType.equalsToText(CommonClassNames.JAVA_LANG_STRING)) {
isString = true;
}
builder.append(operand.getText());
}
else {
isConstant = false;
if (builder.length() != 0) {
append(builder, useStringValueOf && !isString, out);
builder.setLength(0);
}
buildAppendExpression(operand, useStringValueOf, out);
}
}
if (builder.length() != 0) {
append(builder, false, out);
}
}
else if (concatenation instanceof PsiParenthesizedExpression) {
final PsiParenthesizedExpression parenthesizedExpression = (PsiParenthesizedExpression)concatenation;
final PsiExpression expression = parenthesizedExpression.getExpression();
if (expression != null) {
return buildAppendExpression(expression, useStringValueOf, out);
}
}
else {
append(concatenation.getText(), useStringValueOf && !type.equalsToText(CommonClassNames.JAVA_LANG_STRING), out);
}
return out;
}
private static void append(CharSequence text, boolean useStringValueOf, StringBuilder out) {
out.append(".append(");
if (useStringValueOf) {
out.append("String.valueOf(").append(text).append(')');
}
else {
out.append(text);
}
out.append(')');
}
}
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