/*
* Copyright 2013-2016 Sergey Ignatov, Alexander Zolotov, Florin Patan
*
* 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.goide.completion;
import com.goide.GoConstants;
import com.goide.GoParserDefinition;
import com.goide.GoTypes;
import com.goide.psi.*;
import com.goide.psi.impl.GoCachedReference;
import com.goide.psi.impl.GoPsiImplUtil;
import com.goide.runconfig.testing.GoTestFinder;
import com.goide.sdk.GoPackageUtil;
import com.intellij.codeInsight.completion.CompletionContributor;
import com.intellij.codeInsight.completion.CompletionParameters;
import com.intellij.codeInsight.completion.CompletionResultSet;
import com.intellij.codeInsight.completion.CompletionType;
import com.intellij.codeInsight.lookup.AutoCompletionPolicy;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.lang.ASTNode;
import com.intellij.openapi.util.Conditions;
import com.intellij.patterns.PatternCondition;
import com.intellij.patterns.PsiElementPattern;
import com.intellij.psi.PsiDirectory;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.util.ProcessingContext;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import java.util.Collection;
import static com.intellij.codeInsight.completion.PrioritizedLookupElement.withPriority;
import static com.intellij.patterns.PlatformPatterns.psiElement;
public class GoCompletionContributor extends CompletionContributor {
public GoCompletionContributor() {
extend(CompletionType.BASIC, importString(), new GoImportPathsCompletionProvider());
extend(CompletionType.BASIC, referenceExpression(), new GoReferenceCompletionProvider());
extend(CompletionType.BASIC, goReference(), new GoReferenceCompletionProvider());
extend(CompletionType.BASIC, testFunctionSignature(), new GoTestFunctionCompletionProvider());
}
private static PsiElementPattern.Capture<PsiElement> testFunctionSignature() {
return psiElement(GoTypes.IDENTIFIER).with(new GoTestFilePattern()).withParent(GoFunctionDeclaration.class)
.afterLeaf(psiElement().withElementType(GoTypes.FUNC));
}
private static PsiElementPattern.Capture<PsiElement> goReference() {
return psiElement().withParent(psiElement().withReference(GoCachedReference.class));
}
@Override
public void fillCompletionVariants(@NotNull CompletionParameters parameters, @NotNull CompletionResultSet result) {
PsiElement position = parameters.getPosition();
PsiFile file = parameters.getOriginalFile();
ASTNode node = position.getNode();
if (file instanceof GoFile && position.getParent() instanceof GoPackageClause && node.getElementType() == GoTypes.IDENTIFIER) {
boolean isTestFile = GoTestFinder.isTestFile(file);
PsiDirectory directory = file.getParent();
String currentPackageName = ((GoFile)file).getPackageName();
Collection<String> packagesInDirectory = GoPackageUtil.getAllPackagesInDirectory(directory, null, true);
for (String packageName : packagesInDirectory) {
if (!packageName.equals(currentPackageName)) {
result.addElement(packageLookup(packageName, GoCompletionUtil.PACKAGE_PRIORITY - 1));
}
if (isTestFile) {
result.addElement(packageLookup(packageName + GoConstants.TEST_SUFFIX, GoCompletionUtil.PACKAGE_PRIORITY));
}
}
if (directory != null && ContainerUtil.filter(directory.getFiles(), Conditions.instanceOf(GoFile.class)).size() == 1) {
String packageFromDirectory = GoPsiImplUtil.getLocalPackageName(directory.getName());
if (!packageFromDirectory.isEmpty()) {
result.addElement(packageLookup(packageFromDirectory, GoCompletionUtil.PACKAGE_PRIORITY - 1));
}
}
result.addElement(packageLookup(GoConstants.MAIN, GoCompletionUtil.PACKAGE_PRIORITY - 2));
}
super.fillCompletionVariants(parameters, result);
}
@NotNull
private static LookupElement packageLookup(@NotNull String packageName, int priority) {
LookupElement element = withPriority(LookupElementBuilder.create(packageName), priority);
return AutoCompletionPolicy.NEVER_AUTOCOMPLETE.applyPolicy(element);
}
private static PsiElementPattern.Capture<PsiElement> importString() {
return psiElement().withElementType(GoParserDefinition.STRING_LITERALS).withParent(GoStringLiteral.class)
.withSuperParent(2, GoImportString.class);
}
private static PsiElementPattern.Capture<PsiElement> referenceExpression() {
return psiElement().withParent(GoReferenceExpressionBase.class);
}
private static class GoTestFilePattern extends PatternCondition<PsiElement> {
public GoTestFilePattern() {
super("in go test file");
}
@Override
public boolean accepts(@NotNull PsiElement element, ProcessingContext context) {
return GoTestFinder.isTestFile(element.getContainingFile());
}
}
}