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A packaging of the IntelliJ Community Edition util library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2013 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.openapi.diff.impl.processing;

import com.intellij.openapi.diff.impl.string.DiffString;
import com.intellij.openapi.diff.ex.DiffFragment;
import com.intellij.openapi.diff.impl.ComparisonPolicy;
import com.intellij.util.diff.FilesTooBigForDiffException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.TestOnly;

public interface DiffPolicy {
  @NotNull
  DiffFragment[] buildFragments(@NotNull DiffString text1, @NotNull DiffString text2) throws FilesTooBigForDiffException;

  @NotNull
  @TestOnly
  DiffFragment[] buildFragments(@NotNull String text1, @NotNull String text2) throws FilesTooBigForDiffException;

  DiffPolicy LINES_WO_FORMATTING = new LineBlocks(ComparisonPolicy.IGNORE_SPACE);
  DiffPolicy DEFAULT_LINES = new LineBlocks(ComparisonPolicy.DEFAULT);

  class LineBlocks implements DiffPolicy {
    private final ComparisonPolicy myComparisonPolicy;

    public LineBlocks(ComparisonPolicy comparisonPolicy) {
      myComparisonPolicy = comparisonPolicy;
    }

    @NotNull
    @TestOnly
    public DiffFragment[] buildFragments(@NotNull String text1, @NotNull String text2) throws FilesTooBigForDiffException {
      return buildFragments(DiffString.create(text1), DiffString.create(text2));
    }

    @NotNull
    @Override
    public DiffFragment[] buildFragments(@NotNull DiffString text1, @NotNull DiffString text2) throws FilesTooBigForDiffException {
      DiffString[] strings1 = text1.tokenize();
      DiffString[] strings2 = text2.tokenize();
      return myComparisonPolicy.buildDiffFragmentsFromLines(strings1, strings2);
    }

  }

  class ByChar implements DiffPolicy {
    private final ComparisonPolicy myComparisonPolicy;

    public ByChar(ComparisonPolicy comparisonPolicy) {
      myComparisonPolicy = comparisonPolicy;
    }

    @NotNull
    @TestOnly
    public DiffFragment[] buildFragments(@NotNull String text1, @NotNull String text2) throws FilesTooBigForDiffException {
      return buildFragments(DiffString.create(text1), DiffString.create(text2));
    }

    @NotNull
    @Override
    public DiffFragment[] buildFragments(@NotNull DiffString text1, @NotNull DiffString text2) throws FilesTooBigForDiffException {
      return myComparisonPolicy.buildFragments(splitByChar(text1), splitByChar(text2));
    }

    private static DiffString[] splitByChar(@NotNull DiffString text) {
      DiffString[] result = new DiffString[text.length()];
      for (int i = 0; i < result.length; i++) {
        result[i] = text.substring(i, i + 1);
      }
      return result;
    }
  }

}