llvm-project/clang/unittests/Format/FormatTestJava.cpp

//===- unittest/Format/FormatTestJava.cpp - Formatting tests for Java -----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "FormatTestUtils.h"
#include "clang/Format/Format.h"
#include "llvm/Support/Debug.h"
#include "gtest/gtest.h"

#define DEBUG_TYPE "format-test"

namespace clang {
namespace format {

class FormatTestJava : public ::testing::Test {
protected:
  static std::string format(llvm::StringRef Code, unsigned Offset,
                            unsigned Length, const FormatStyle &Style) {
    LLVM_DEBUG(llvm::errs() << "---\n");
    LLVM_DEBUG(llvm::errs() << Code << "\n\n");
    std::vector<tooling::Range> Ranges(1, tooling::Range(Offset, Length));
    tooling::Replacements Replaces = reformat(Style, Code, Ranges);
    auto Result = applyAllReplacements(Code, Replaces);
    EXPECT_TRUE(static_cast<bool>(Result));
    LLVM_DEBUG(llvm::errs() << "\n" << *Result << "\n\n");
    return *Result;
  }

  static std::string
  format(llvm::StringRef Code,
         const FormatStyle &Style = getGoogleStyle(FormatStyle::LK_Java)) {
    return format(Code, 0, Code.size(), Style);
  }

  static FormatStyle getStyleWithColumns(unsigned ColumnLimit) {
    FormatStyle Style = getGoogleStyle(FormatStyle::LK_Java);
    Style.ColumnLimit = ColumnLimit;
    return Style;
  }

  static void verifyFormat(
      llvm::StringRef Code,
      const FormatStyle &Style = getGoogleStyle(FormatStyle::LK_Java)) {
    EXPECT_EQ(Code.str(), format(Code, Style)) << "Expected code is not stable";
    EXPECT_EQ(Code.str(), format(test::messUp(Code), Style));
  }
};

TEST_F(FormatTestJava, NoAlternativeOperatorNames) {
  verifyFormat("someObject.and();");
}

TEST_F(FormatTestJava, UnderstandsCasts) {
  verifyFormat("a[b >> 1] = (byte) (c() << 4);");
}

TEST_F(FormatTestJava, FormatsInstanceOfLikeOperators) {
  FormatStyle Style = getStyleWithColumns(50);
  verifyFormat("return aaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"
               "    instanceof bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;",
               Style);
  Style.BreakBeforeBinaryOperators = FormatStyle::BOS_None;
  verifyFormat("return aaaaaaaaaaaaaaaaaaaaaaaaaaaaa instanceof\n"
               "    bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;",
               Style);
  verifyFormat("return aaaaaaaaaaaaaaaaaaa instanceof bbbbbbbbbbbbbbbbbbbbbbb\n"
               "    && ccccccccccccccccccc instanceof dddddddddddddddddddddd;");
}

TEST_F(FormatTestJava, Chromium) {
  verifyFormat("class SomeClass {\n"
               "    void f() {}\n"
               "    int g() {\n"
               "        return 0;\n"
               "    }\n"
               "    void h() {\n"
               "        while (true) f();\n"
               "        for (;;) f();\n"
               "        if (true) f();\n"
               "    }\n"
               "}",
               getChromiumStyle(FormatStyle::LK_Java));
}

TEST_F(FormatTestJava, QualifiedNames) {
  verifyFormat("public some.package.Type someFunction( // comment\n"
               "    int parameter) {}");
}

TEST_F(FormatTestJava, ClassKeyword) {
  verifyFormat("SomeClass.class.getName();");
  verifyFormat("Class c = SomeClass.class;");
}

TEST_F(FormatTestJava, ClassDeclarations) {
  verifyFormat("public class SomeClass {\n"
               "  private int a;\n"
               "  private int b;\n"
               "}");
  verifyFormat("public class A {\n"
               "  class B {\n"
               "    int i;\n"
               "  }\n"
               "  class C {\n"
               "    int j;\n"
               "  }\n"
               "}");
  verifyFormat("public class A extends B.C {}");

  verifyFormat("abstract class SomeClass\n"
               "    extends SomeOtherClass implements SomeInterface {}",
               getStyleWithColumns(60));
  verifyFormat("abstract class SomeClass extends SomeOtherClass\n"
               "    implements SomeInterfaceeeeeeeeeeeee {}",
               getStyleWithColumns(60));
  verifyFormat("abstract class SomeClass\n"
               "    extends SomeOtherClass\n"
               "    implements SomeInterface {}",
               getStyleWithColumns(40));
  verifyFormat("abstract class SomeClass\n"
               "    extends SomeOtherClass\n"
               "    implements SomeInterface,\n"
               "               AnotherInterface {}",
               getStyleWithColumns(40));
  verifyFormat("abstract class SomeClass\n"
               "    implements SomeInterface, AnotherInterface {}",
               getStyleWithColumns(60));
  verifyFormat("@SomeAnnotation()\n"
               "abstract class aaaaaaaaaaaa\n"
               "    extends bbbbbbbbbbbbbbb implements cccccccccccc {}",
               getStyleWithColumns(76));
  verifyFormat("@SomeAnnotation()\n"
               "abstract class aaaaaaaaa<a>\n"
               "    extends bbbbbbbbbbbb<b> implements cccccccccccc {}",
               getStyleWithColumns(76));
  verifyFormat("interface SomeInterface<A> extends Foo, Bar {\n"
               "  void doStuff(int theStuff);\n"
               "  void doMoreStuff(int moreStuff);\n"
               "}");
  verifyFormat("public interface SomeInterface {\n"
               "  void doStuff(int theStuff);\n"
               "  void doMoreStuff(int moreStuff);\n"
               "  default void doStuffWithDefault() {}\n"
               "}");
  verifyFormat("@interface SomeInterface {\n"
               "  void doStuff(int theStuff);\n"
               "  void doMoreStuff(int moreStuff);\n"
               "}");
  verifyFormat("public @interface SomeInterface {\n"
               "  void doStuff(int theStuff);\n"
               "  void doMoreStuff(int moreStuff);\n"
               "}");
  verifyFormat("class A {\n"
               "  public @interface SomeInterface {\n"
               "    int stuff;\n"
               "    void doMoreStuff(int moreStuff);\n"
               "  }\n"
               "}");
  verifyFormat("class A {\n"
               "  public @interface SomeInterface {}\n"
               "}");
}

TEST_F(FormatTestJava, AnonymousClasses) {
  verifyFormat("return new A() {\n"
               "  public String toString() {\n"
               "    return \"NotReallyA\";\n"
               "  }\n"
               "};");
  verifyFormat("A a = new A() {\n"
               "  public String toString() {\n"
               "    return \"NotReallyA\";\n"
               "  }\n"
               "};");
}

TEST_F(FormatTestJava, EnumDeclarations) {
  verifyFormat("enum SomeThing { ABC, CDE }");
  verifyFormat("enum SomeThing {\n"
               "  ABC,\n"
               "  CDE,\n"
               "}");
  verifyFormat("public class SomeClass {\n"
               "  enum SomeThing { ABC, CDE }\n"
               "  void f() {}\n"
               "}");
  verifyFormat("public class SomeClass implements SomeInterface {\n"
               "  enum SomeThing { ABC, CDE }\n"
               "  void f() {}\n"
               "}");
  verifyFormat("enum SomeThing {\n"
               "  ABC,\n"
               "  CDE;\n"
               "  void f() {}\n"
               "}");
  verifyFormat("enum SomeThing {\n"
               "  ABC(1, \"ABC\"),\n"
               "  CDE(2, \"CDE\");\n"
               "  Something(int i, String s) {}\n"
               "}");
  verifyFormat("enum SomeThing {\n"
               "  ABC(new int[] {1, 2}),\n"
               "  CDE(new int[] {2, 3});\n"
               "  Something(int[] i) {}\n"
               "}");
  verifyFormat("public enum SomeThing {\n"
               "  ABC {\n"
               "    public String toString() {\n"
               "      return \"ABC\";\n"
               "    }\n"
               "  },\n"
               "  CDE {\n"
               "    @Override\n"
               "    public String toString() {\n"
               "      return \"CDE\";\n"
               "    }\n"
               "  };\n"
               "  public void f() {}\n"
               "}");
  verifyFormat("private enum SomeEnum implements Foo<?, B> {\n"
               "  ABC {\n"
               "    @Override\n"
               "    public String toString() {\n"
               "      return \"ABC\";\n"
               "    }\n"
               "  },\n"
               "  CDE {\n"
               "    @Override\n"
               "    public String toString() {\n"
               "      return \"CDE\";\n"
               "    }\n"
               "  };\n"
               "}");
  verifyFormat("public enum VeryLongEnum {\n"
               "  ENUM_WITH_MANY_PARAMETERS(\n"
               "      \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaa\", \"bbbbbbbbbbbbbbbb\", "
               "\"cccccccccccccccccccccccc\"),\n"
               "  SECOND_ENUM(\"a\", \"b\", \"c\");\n"
               "  private VeryLongEnum(String a, String b, String c) {}\n"
               "}\n");
}

TEST_F(FormatTestJava, ArrayInitializers) {
  verifyFormat("new int[] {1, 2, 3, 4};");
  verifyFormat("new int[] {\n"
               "    1,\n"
               "    2,\n"
               "    3,\n"
               "    4,\n"
               "};");

  FormatStyle Style = getStyleWithColumns(65);
  Style.Cpp11BracedListStyle = false;
  verifyFormat(
      "expected = new int[] { 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,\n"
      "  100, 100, 100, 100, 100, 100, 100, 100, 100, 100 };",
      Style);
}

TEST_F(FormatTestJava, ThrowsDeclarations) {
  verifyFormat("public void doSooooooooooooooooooooooooooomething()\n"
               "    throws LooooooooooooooooooooooooooooongException {}");
  verifyFormat("public void doSooooooooooooooooooooooooooomething()\n"
               "    throws LoooooooooongException, LooooooooooongException {}");
}

TEST_F(FormatTestJava, Annotations) {
  verifyFormat("@Override\n"
               "public String toString() {}");
  verifyFormat("@Override\n"
               "@Nullable\n"
               "public String getNameIfPresent() {}");
  verifyFormat("@Override // comment\n"
               "@Nullable\n"
               "public String getNameIfPresent() {}");
  verifyFormat("@java.lang.Override // comment\n"
               "@Nullable\n"
               "public String getNameIfPresent() {}");

  verifyFormat("@SuppressWarnings(value = \"unchecked\")\n"
               "public void doSomething() {}");
  verifyFormat("@SuppressWarnings(value = \"unchecked\")\n"
               "@Author(name = \"abc\")\n"
               "public void doSomething() {}");

  verifyFormat("DoSomething(new A() {\n"
               "  @Override\n"
               "  public String toString() {}\n"
               "});");

  verifyFormat("void SomeFunction(@Nullable String something) {}");
  verifyFormat("void SomeFunction(@org.llvm.Nullable String something) {}");

  verifyFormat("@Partial @Mock DataLoader loader;");
  verifyFormat("@Partial\n"
               "@Mock\n"
               "DataLoader loader;",
               getChromiumStyle(FormatStyle::LK_Java));
  verifyFormat("@SuppressWarnings(value = \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\")\n"
               "public static int iiiiiiiiiiiiiiiiiiiiiiii;");

  verifyFormat("@SomeAnnotation(\"With some really looooooooooooooong text\")\n"
               "private static final long something = 0L;");
  verifyFormat("@org.llvm.Qualified(\"With some really looooooooooong text\")\n"
               "private static final long something = 0L;");
  verifyFormat("@Mock\n"
               "DataLoader loooooooooooooooooooooooader =\n"
               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa;",
               getStyleWithColumns(60));
  verifyFormat("@org.llvm.QualifiedMock\n"
               "DataLoader loooooooooooooooooooooooader =\n"
               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa;",
               getStyleWithColumns(60));
  verifyFormat("@Test(a)\n"
               "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa =\n"
               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaa);");
  verifyFormat("@SomeAnnotation(\n"
               "    aaaaaaaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaaa)\n"
               "int i;",
               getStyleWithColumns(50));
  verifyFormat("@Test\n"
               "ReturnType doSomething(\n"
               "    String aaaaaaaaaaaaa, String bbbbbbbbbbbbbbb) {}",
               getStyleWithColumns(60));
  verifyFormat("{\n"
               "  boolean someFunction(\n"
               "      @Param(aaaaaaaaaaaaaaaa) String aaaaa,\n"
               "      String bbbbbbbbbbbbbbb) {}\n"
               "}",
               getStyleWithColumns(60));
  verifyFormat("@Annotation(\"Some\"\n"
               "    + \" text\")\n"
               "List<Integer> list;");
}

TEST_F(FormatTestJava, Generics) {
  verifyFormat("Iterable<?> a;");
  verifyFormat("Iterable<?> a;");
  verifyFormat("Iterable<? extends SomeObject> a;");

  verifyFormat("A.<B>doSomething();");
  verifyFormat("A.<B<C>>doSomething();");
  verifyFormat("A.<B<C<D>>>doSomething();");
  verifyFormat("A.<B<C<D<E>>>>doSomething();");

  verifyFormat("OrderedPair<String, List<Box<Integer>>> p = null;");

  verifyFormat("@Override\n"
               "public Map<String, ?> getAll() {}");

  verifyFormat("public <R> ArrayList<R> get() {}");
  verifyFormat("protected <R> ArrayList<R> get() {}");
  verifyFormat("private <R> ArrayList<R> get() {}");
  verifyFormat("public static <R> ArrayList<R> get() {}");
  verifyFormat("public static native <R> ArrayList<R> get();");
  verifyFormat("public final <X> Foo foo() {}");
  verifyFormat("public abstract <X> Foo foo();");
  verifyFormat("<T extends B> T getInstance(Class<T> type);");
  verifyFormat("Function<F, ? extends T> function;");

  verifyFormat("private Foo<X, Y>[] foos;");
  verifyFormat("Foo<X, Y>[] foos = this.foos;");
  verifyFormat("return (a instanceof List<?>)\n"
               "    ? aaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaa)\n"
               "    : aaaaaaaaaaaaaaaaaaaaaaa;",
               getStyleWithColumns(60));

  verifyFormat(
      "SomeLoooooooooooooooooooooongType name =\n"
      "    SomeType.foo(someArgument)\n"
      "        .<X>method()\n"
      "        .aaaaaaaaaaaaaaaaaaa()\n"
      "        .aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa();");
}

TEST_F(FormatTestJava, StringConcatenation) {
  verifyFormat("String someString = \"abc\"\n"
               "    + \"cde\";");
}

TEST_F(FormatTestJava, TryCatchFinally) {
  verifyFormat("try {\n"
               "  Something();\n"
               "} catch (SomeException e) {\n"
               "  HandleException(e);\n"
               "}");
  verifyFormat("try {\n"
               "  Something();\n"
               "} finally {\n"
               "  AlwaysDoThis();\n"
               "}");
  verifyFormat("try {\n"
               "  Something();\n"
               "} catch (SomeException e) {\n"
               "  HandleException(e);\n"
               "} finally {\n"
               "  AlwaysDoThis();\n"
               "}");

  verifyFormat("try {\n"
               "  Something();\n"
               "} catch (SomeException | OtherException e) {\n"
               "  HandleException(e);\n"
               "}");
}

TEST_F(FormatTestJava, TryWithResources) {
  verifyFormat("try (SomeResource rs = someFunction()) {\n"
               "  Something();\n"
               "}");
  verifyFormat("try (SomeResource rs = someFunction()) {\n"
               "  Something();\n"
               "} catch (SomeException e) {\n"
               "  HandleException(e);\n"
               "}");
}

TEST_F(FormatTestJava, SynchronizedKeyword) {
  verifyFormat("synchronized (mData) {\n"
               "  // ...\n"
               "}");
}

TEST_F(FormatTestJava, AssertKeyword) {
  verifyFormat("assert a && b;");
  verifyFormat("assert (a && b);");
}

TEST_F(FormatTestJava, PackageDeclarations) {
  verifyFormat("package some.really.loooooooooooooooooooooong.package;",
               getStyleWithColumns(50));
}

TEST_F(FormatTestJava, ImportDeclarations) {
  verifyFormat("import some.really.loooooooooooooooooooooong.imported.Class;",
               getStyleWithColumns(50));
  verifyFormat("import static some.really.looooooooooooooooong.imported.Class;",
               getStyleWithColumns(50));
}

TEST_F(FormatTestJava, MethodDeclarations) {
  verifyFormat("void methodName(Object arg1,\n"
               "    Object arg2, Object arg3) {}",
               getStyleWithColumns(40));
  verifyFormat("void methodName(\n"
               "    Object arg1, Object arg2) {}",
               getStyleWithColumns(40));
}

TEST_F(FormatTestJava, MethodReference) {
  EXPECT_EQ(
      "private void foo() {\n"
      "  f(this::methodReference);\n"
      "  f(C.super::methodReference);\n"
      "  Consumer<String> c = System.out::println;\n"
      "  Iface<Integer> mRef = Ty::<Integer>meth;\n"
      "}",
      format("private void foo() {\n"
             "  f(this ::methodReference);\n"
             "  f(C.super ::methodReference);\n"
             "  Consumer<String> c = System.out ::println;\n"
             "  Iface<Integer> mRef = Ty :: <Integer> meth;\n"
             "}"));
}

TEST_F(FormatTestJava, CppKeywords) {
  verifyFormat("public void union(Type a, Type b);");
  verifyFormat("public void struct(Object o);");
  verifyFormat("public void delete(Object o);");
  verifyFormat("return operator && (aa);");
}

TEST_F(FormatTestJava, NeverAlignAfterReturn) {
  verifyFormat("return aaaaaaaaaaaaaaaaaaa\n"
               "    && bbbbbbbbbbbbbbbbbbb\n"
               "    && ccccccccccccccccccc;",
               getStyleWithColumns(40));
  verifyFormat("return (result == null)\n"
               "    ? aaaaaaaaaaaaaaaaa\n"
               "    : bbbbbbbbbbbbbbbbb;",
               getStyleWithColumns(40));
  verifyFormat("return aaaaaaaaaaaaaaaaaaa()\n"
               "    .bbbbbbbbbbbbbbbbbbb()\n"
               "    .ccccccccccccccccccc();",
               getStyleWithColumns(40));
  verifyFormat("return aaaaaaaaaaaaaaaaaaa()\n"
               "    .bbbbbbbbbbbbbbbbbbb(\n"
               "        ccccccccccccccc)\n"
               "    .ccccccccccccccccccc();",
               getStyleWithColumns(40));
}

TEST_F(FormatTestJava, FormatsInnerBlocks) {
  verifyFormat("someObject.someFunction(new Runnable() {\n"
               "  @Override\n"
               "  public void run() {\n"
               "    System.out.println(42);\n"
               "  }\n"
               "}, someOtherParameter);");
  verifyFormat("someFunction(new Runnable() {\n"
               "  public void run() {\n"
               "    System.out.println(42);\n"
               "  }\n"
               "});");
  verifyFormat("someObject.someFunction(\n"
               "    new Runnable() {\n"
               "      @Override\n"
               "      public void run() {\n"
               "        System.out.println(42);\n"
               "      }\n"
               "    },\n"
               "    new Runnable() {\n"
               "      @Override\n"
               "      public void run() {\n"
               "        System.out.println(43);\n"
               "      }\n"
               "    },\n"
               "    someOtherParameter);");
}

TEST_F(FormatTestJava, FormatsLambdas) {
  verifyFormat("(aaaaaaaaaa, bbbbbbbbbb) -> aaaaaaaaaa + bbbbbbbbbb;");
  verifyFormat("(aaaaaaaaaa, bbbbbbbbbb)\n"
               "    -> aaaaaaaaaa + bbbbbbbbbb;",
               getStyleWithColumns(40));
  verifyFormat("Runnable someLambda = () -> DoSomething();");
  verifyFormat("Runnable someLambda = () -> {\n"
               "  DoSomething();\n"
               "}");

  verifyFormat("Runnable someLambda =\n"
               "    (int aaaaa) -> DoSomething(aaaaa);",
               getStyleWithColumns(40));
}

TEST_F(FormatTestJava, BreaksStringLiterals) {
  // FIXME: String literal breaking is currently disabled for Java and JS, as it
  // requires strings to be merged using "+" which we don't support.
  EXPECT_EQ("\"some text other\";",
            format("\"some text other\";", getStyleWithColumns(14)));
}

TEST_F(FormatTestJava, AlignsBlockComments) {
  EXPECT_EQ("/*\n"
            " * Really multi-line\n"
            " * comment.\n"
            " */\n"
            "void f() {}",
            format("  /*\n"
                   "   * Really multi-line\n"
                   "   * comment.\n"
                   "   */\n"
                   "  void f() {}"));
}

TEST_F(FormatTestJava, KeepsDelimitersOnOwnLineInJavaDocComments) {
  EXPECT_EQ("/**\n"
            " * javadoc line 1\n"
            " * javadoc line 2\n"
            " */",
            format("/** javadoc line 1\n"
                   " * javadoc line 2 */"));
}

TEST_F(FormatTestJava, RetainsLogicalShifts) {
    verifyFormat("void f() {\n"
                 "  int a = 1;\n"
                 "  a >>>= 1;\n"
                 "}");
    verifyFormat("void f() {\n"
                 "  int a = 1;\n"
                 "  a = a >>> 1;\n"
                 "}");
}


} // end namespace tooling
} // end namespace clang