JsonCompletionContributor.java

/*
 * 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.json.codeinsight;

import com.intellij.codeInsight.completion.*;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.json.psi.JsonArray;
import com.intellij.json.psi.JsonProperty;
import com.intellij.json.psi.JsonStringLiteral;
import com.intellij.patterns.PsiElementPattern;
import com.intellij.psi.PsiElement;
import com.intellij.util.ProcessingContext;
import org.jetbrains.annotations.NotNull;

import static com.intellij.patterns.PlatformPatterns.psiElement;

/**
 * @author Mikhail Golubev
 */
public class JsonCompletionContributor extends CompletionContributor {

  private static final PsiElementPattern.Capture<PsiElement> AFTER_COLON_IN_PROPERTY = psiElement()
    .afterLeaf(":").withSuperParent(2, JsonProperty.class)
    .andNot(psiElement().withParent(JsonStringLiteral.class));
  
  private static final PsiElementPattern.Capture<PsiElement> AFTER_COMMA_OR_BRACKET_IN_ARRAY = psiElement()
    .afterLeaf("[", ",").withSuperParent(2, JsonArray.class)
    .andNot(psiElement().withParent(JsonStringLiteral.class));
  
  public JsonCompletionContributor() {
    extend(CompletionType.BASIC, AFTER_COLON_IN_PROPERTY, MyKeywordsCompletionProvider.INSTANCE);
    extend(CompletionType.BASIC, AFTER_COMMA_OR_BRACKET_IN_ARRAY, MyKeywordsCompletionProvider.INSTANCE);
  }

  private static class MyKeywordsCompletionProvider extends CompletionProvider<CompletionParameters> {
    private static final MyKeywordsCompletionProvider INSTANCE = new MyKeywordsCompletionProvider();
    private static final String[] KEYWORDS = new String[]{"null", "true", "false"};

    @Override
    protected void addCompletions(@NotNull CompletionParameters parameters,
                                  ProcessingContext context,
                                  @NotNull CompletionResultSet result) {
      for (String keyword : KEYWORDS) {
        result.addElement(LookupElementBuilder.create(keyword).bold());
      }
    }
  }
}