idea_plugin/src/com/google/googlejavaformat/intellij/FormatterUtil.java

/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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.google.googlejavaformat.intellij;

import static com.google.common.base.Preconditions.checkState;

import com.google.common.collect.BoundType;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Range;
import com.google.googlejavaformat.java.Formatter;
import com.google.googlejavaformat.java.FormatterException;
import com.intellij.openapi.util.TextRange;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Collectors;

final class FormatterUtil {

  private FormatterUtil() {}

  static Map<TextRange, String> getReplacements(
      Formatter formatter, String text, Collection<TextRange> ranges) {
    try {
      ImmutableMap.Builder<TextRange, String> replacements = ImmutableMap.builder();
      formatter
          .getFormatReplacements(text, toRanges(ranges))
          .forEach(
              replacement ->
                  replacements.put(
                      toTextRange(replacement.getReplaceRange()),
                      replacement.getReplacementString()));
      return replacements.build();
    } catch (FormatterException e) {
      return ImmutableMap.of();
    }
  }

  private static Collection<Range<Integer>> toRanges(Collection<TextRange> textRanges) {
    return textRanges
        .stream()
        .map(textRange -> Range.closedOpen(textRange.getStartOffset(), textRange.getEndOffset()))
        .collect(Collectors.toList());
  }

  private static TextRange toTextRange(Range<Integer> range) {
    checkState(
        range.lowerBoundType().equals(BoundType.CLOSED)
            && range.upperBoundType().equals(BoundType.OPEN));
    return new TextRange(range.lowerEndpoint(), range.upperEndpoint());
  }
}