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/*
* Copyright 2000-2014 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.template.postfix.templates;
import com.intellij.codeInsight.guess.GuessManager;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.PsiTypeLookupItem;
import com.intellij.codeInsight.template.*;
import com.intellij.codeInsight.template.postfix.util.Aliases;
import com.intellij.codeInsight.template.postfix.util.PostfixTemplatesUtils;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.RangeMarker;
import com.intellij.openapi.editor.ScrollType;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.*;
import com.intellij.refactoring.introduceField.ElementToWorkOn;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import java.util.LinkedHashSet;
import java.util.Set;
@Aliases(".inst")
public class InstanceofExpressionPostfixTemplate extends PostfixTemplate {
public InstanceofExpressionPostfixTemplate() {
super("instanceof", "Surrounds expression with instanceof", "expr instanceof SomeType ? ((SomeType) expr). : null");
}
@Override
public boolean isApplicable(@NotNull PsiElement context, @NotNull Document copyDocument, int newOffset) {
return PostfixTemplatesUtils.isNotPrimitiveTypeExpression(getTopmostExpression(context));
}
@Override
public void expand(@NotNull PsiElement context, @NotNull Editor editor) {
PsiExpression expression = getTopmostExpression(context);
if (!PostfixTemplatesUtils.isNotPrimitiveTypeExpression(expression)) return;
surroundExpression(context.getProject(), editor, expression);
}
private static void surroundExpression(@NotNull Project project, @NotNull Editor editor, @NotNull PsiExpression expr) throws IncorrectOperationException {
assert expr.isValid();
PsiType[] types = GuessManager.getInstance(project).guessTypeToCast(expr);
final boolean parenthesesNeeded = expr instanceof PsiPolyadicExpression ||
expr instanceof PsiConditionalExpression ||
expr instanceof PsiAssignmentExpression;
String exprText = parenthesesNeeded ? "(" + expr.getText() + ")" : expr.getText();
Template template = generateTemplate(project, exprText, types);
TextRange range;
if (expr.isPhysical()) {
range = expr.getTextRange();
}
else {
RangeMarker rangeMarker = expr.getUserData(ElementToWorkOn.TEXT_RANGE);
if (rangeMarker == null) {
PostfixTemplatesUtils.showErrorHint(project, editor);
return;
}
range = new TextRange(rangeMarker.getStartOffset(), rangeMarker.getEndOffset());
}
editor.getDocument().deleteString(range.getStartOffset(), range.getEndOffset());
editor.getCaretModel().moveToOffset(range.getStartOffset());
editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
TemplateManager.getInstance(project).startTemplate(editor, template);
}
private static Template generateTemplate(Project project, String exprText, PsiType[] suggestedTypes) {
TemplateManager templateManager = TemplateManager.getInstance(project);
Template template = templateManager.createTemplate("", "");
template.setToReformat(true);
Set<LookupElement> itemSet = new LinkedHashSet<LookupElement>();
for (PsiType type : suggestedTypes) {
itemSet.add(PsiTypeLookupItem.createLookupItem(type, null));
}
final LookupElement[] lookupItems = itemSet.toArray(new LookupElement[itemSet.size()]);
final Result result = suggestedTypes.length > 0 ? new PsiTypeResult(suggestedTypes[0], project) : null;
Expression expr = new Expression() {
@Override
public LookupElement[] calculateLookupItems(ExpressionContext context) {
return lookupItems.length > 1 ? lookupItems : null;
}
@Override
public Result calculateResult(ExpressionContext context) {
return result;
}
@Override
public Result calculateQuickResult(ExpressionContext context) {
return null;
}
};
template.addTextSegment(exprText);
template.addTextSegment(" instanceof ");
String type = "type";
template.addVariable(type, expr, expr, true);
template.addTextSegment(" ? ((");
template.addVariableSegment(type);
template.addTextSegment(")" + exprText + ")");
template.addEndVariable();
template.addTextSegment(" : null;");
return template;
}
}
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