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/*
* Copyright 2000-2010 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 org.jetbrains.plugins.groovy.lang.completion;
import com.intellij.codeInsight.completion.*;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.LookupItem;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiParameter;
import com.intellij.psi.PsiType;
import com.intellij.psi.ResolveResult;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.lang.psi.impl.statements.expressions.TypesUtil;
import org.jetbrains.plugins.groovy.lang.psi.util.GroovyCommonClassNames;
import java.util.ArrayList;
/**
* @author Maxim.Medvedev
*/
public class GrMethodMergingContributor extends CompletionContributor {
@Override
public AutoCompletionDecision handleAutoCompletionPossibility(@NotNull AutoCompletionContext context) {
final CompletionParameters parameters = context.getParameters();
if (parameters.getCompletionType() != CompletionType.SMART && parameters.getCompletionType() != CompletionType.BASIC) {
return null;
}
boolean needInsertBrace = false;
boolean needInsertParenth = false;
final LookupElement[] items = context.getItems();
if (items.length > 1) {
String commonName = null;
LookupElement best = null;
final ArrayList<PsiMethod> allMethods = new ArrayList<PsiMethod>();
for (LookupElement item : items) {
Object o = item.getObject();
if (o instanceof ResolveResult) {
o = ((ResolveResult)o).getElement();
}
if (item.getUserData(LookupItem.FORCE_SHOW_SIGNATURE_ATTR) != null || !(o instanceof PsiMethod)) {
return AutoCompletionDecision.SHOW_LOOKUP;
}
final PsiMethod method = (PsiMethod)o;
final JavaChainLookupElement chain = item.as(JavaChainLookupElement.CLASS_CONDITION_KEY);
final String name = method.getName() + "#" + (chain == null ? "" : chain.getQualifier().getLookupString());
if (commonName != null && !commonName.equals(name)) {
return AutoCompletionDecision.SHOW_LOOKUP;
}
if (hasOnlyClosureParams(method)) {
needInsertBrace = true;
}
else {
needInsertParenth = true;
}
if (needInsertBrace && needInsertParenth) {
return AutoCompletionDecision.SHOW_LOOKUP;
}
if (best == null && method.getParameterList().getParametersCount() > 0) {
best = item;
}
commonName = name;
allMethods.add(method);
item.putUserData(JavaCompletionUtil.ALL_METHODS_ATTRIBUTE, allMethods);
}
if (best == null) {
best = items[0];
}
return AutoCompletionDecision.insertItem(best);
}
return super.handleAutoCompletionPossibility(context);
}
private static boolean hasOnlyClosureParams(PsiMethod method) {
final PsiParameter[] params = method.getParameterList().getParameters();
for (PsiParameter param : params) {
final PsiType type = param.getType();
if (!TypesUtil.isClassType(type, GroovyCommonClassNames.GROOVY_LANG_CLOSURE)) {
return false;
}
}
return params.length > 0;
}
}
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