platform/platform-tests/testSrc/com/intellij/psi/autodetect/IndentAutoDetectionTest.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.psi.autodetect;

import com.intellij.openapi.editor.Document;
import com.intellij.psi.codeStyle.autodetect.*;
import com.intellij.testFramework.LightPlatformCodeInsightTestCase;
import com.intellij.testFramework.PlatformTestCase;
import com.intellij.testFramework.PlatformTestUtil;
import org.jetbrains.annotations.NotNull;
import org.junit.Assert;

import java.io.File;
import java.util.List;

public class IndentAutoDetectionTest extends LightPlatformCodeInsightTestCase {
  private static final String BASE_PATH = "codeStyle/autodetect/";

  static {
    PlatformTestCase.initPlatformLangPrefix();
  }

  public void testSimpleIndent() {
    doTestMaxUsedIndent(2, 6);
  }

  public void testManyComments() {
    doTestMaxUsedIndent(2, 6);
  }

  public void testManyZeroRelativeIndent() {
    doTestMaxUsedIndent(2);
  }

  public void testSpacesToNumbers() throws Exception {
    String text = "     i\n" +
                  "    a\n" +
                  "          t\n";
    doTestLineToIndentMapping(text, 5, 4, 10);
  }

  public void testEmptyLines() throws Exception {
    doTestLineToIndentMapping("     \n\n\n", -1, -1, -1);
  }

  public void testSpacesInSimpleClass() {
    doTestLineToIndentMapping(
      "public class A {\n" +
      "\n" +
      "    public void test() {\n" +
      "      int a = 2;\n" +
      "    }\n" +
      "\n" +
      "    public void a() {\n" +
      "    }\n" +
      "}",
      0, -1, 4, 6, 4, -1, 4, 4, 0
    );
  }

  public void testComplexIndents() {
    doTestLineToIndentMapping(
      "class Test\n" +
      "{\n" +
      "  int a;\n" +
      "  int b;\n" +
      "  \n" +
      "  public void test() {\n" +
      "    int c;\n" +
      "  }\n" +
      "  \n" +
      "  public void run() {\n" +
      "    Runnable runnable = new Runnable() {\n" +
      "      @Override\n" +
      "      public void run() {\n" +
      "        System.out.println(\"Hello!\");\n" +
      "      }\n" +
      "    };\n" +
      "  }\n" +
      "}",
      0, 0, 2, 2, -1, 2, 4, 2, -1, 2, 4, 6, 6, 8, 6, 4, 2, 0
    );
  }

  public void doTestMaxUsedIndent(int indentExpected, int timesUsedExpected) {
    IndentUsageInfo maxIndentExpected = new IndentUsageInfo(indentExpected, timesUsedExpected);
    IndentUsageInfo indentInfo = getMaxUsedIndentInfo();
    Assert.assertEquals("Indent size mismatch", maxIndentExpected.getIndentSize(), indentInfo.getIndentSize());
    Assert.assertEquals("Indent size usage number mismatch", maxIndentExpected.getTimesUsed(), indentInfo.getTimesUsed());
  }

  public void doTestMaxUsedIndent(int indentExpected) {
    IndentUsageInfo indentInfo = getMaxUsedIndentInfo();
    Assert.assertEquals("Indent size mismatch", indentExpected, indentInfo.getIndentSize());
  }

  @NotNull
  private IndentUsageInfo getMaxUsedIndentInfo() {
    configureByFile(getTestName(true) + ".java");
    Document document = getDocument(myFile);
    List<LineIndentInfo> lines = new LineIndentInfoBuilder(document.getCharsSequence()).build();
    IndentUsageStatistics statistics = new IndentUsageStatisticsImpl(lines);
    return statistics.getKMostUsedIndentInfo(0);
  }

  private static void doTestLineToIndentMapping(@NotNull CharSequence text, int... spacesForLine) {
    List<LineIndentInfo> list = new LineIndentInfoBuilder(text).build();
    Assert.assertEquals(list.size(), spacesForLine.length);
    for (int i = 0; i < spacesForLine.length; i++) {
      int indentSize = list.get(i).getIndentSize();
      Assert.assertEquals("Mismatch on line " + i, spacesForLine[i], indentSize);
    }
  }

  @Override
  @NotNull
  public String getTestDataPath() {
    return PlatformTestUtil.getCommunityPath().replace(File.separatorChar, '/')
           + "/platform/platform-tests/testData/"
           + BASE_PATH;
  }
}