Add `FloatingLiteral` to SyntaxTree

[eduucaldas]

removing automatically added include

[eduucaldas]

clang/unittests/Tooling/Syntax/TreeTest.cpp

72–75

This was already defined in this patch. But I wanted to make them independent.

[gribozavr2]

clang/unittests/Tooling/Syntax/TreeTest.cpp

1239–1242

Indent -2.

[eduucaldas]

Fix indenting

clang/include/clang/Tooling/Syntax/Nodes.h

enum class NodeKind : uint16_t {
 
   // Expressions.
   UnknownExpression,
   PrefixUnaryOperatorExpression,
   PostfixUnaryOperatorExpression,
   BinaryOperatorExpression,
   CxxNullPtrExpression,
   IntegerLiteralExpression,
+  FloatingLiteralExpression,
   IdExpression,
 
   // Statements.
   UnknownStatement,
   DeclarationStatement,
   EmptyStatement,
   SwitchStatement,
   CaseStatement,

 public:
   CxxNullPtrExpression() : Expression(NodeKind::CxxNullPtrExpression) {}
   static bool classof(const Node *N) {
     return N->kind() == NodeKind::CxxNullPtrExpression;
   }
   syntax::Leaf *nullPtrKeyword();
 };
 
+/// Expression for floating-point literals. C++ [lex.fcon]
+class FloatingLiteralExpression final : public Expression {
+public:
+  FloatingLiteralExpression()
+      : Expression(NodeKind::FloatingLiteralExpression) {}
+  static bool classof(const Node *N) {
+    return N->kind() == NodeKind::FloatingLiteralExpression;
+  }
+  syntax::Leaf *literalToken();
+};
+
 /// Expression for integer literals.
 class IntegerLiteralExpression final : public Expression {
 public:
   IntegerLiteralExpression() : Expression(NodeKind::IntegerLiteralExpression) {}
   static bool classof(const Node *N) {
     return N->kind() == NodeKind::IntegerLiteralExpression;
   }
   syntax::Leaf *literalToken();

clang/lib/Tooling/Syntax/BuildTree.cpp

public:
 
   bool WalkUpFromIntegerLiteral(IntegerLiteral *S) {
     Builder.markChildToken(S->getLocation(), syntax::NodeRole::LiteralToken);
     Builder.foldNode(Builder.getExprRange(S),
                      new (allocator()) syntax::IntegerLiteralExpression, S);
     return true;
   }
 
+  bool WalkUpFromFloatingLiteral(FloatingLiteral *S) {
+    Builder.markChildToken(S->getLocation(), syntax::NodeRole::LiteralToken);
+    Builder.foldNode(Builder.getExprRange(S),
+                     new (allocator()) syntax::FloatingLiteralExpression, S);
+    return true;
+  }
+
   bool WalkUpFromCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *S) {
     Builder.markChildToken(S->getLocation(), syntax::NodeRole::LiteralToken);
     Builder.foldNode(Builder.getExprRange(S),
                      new (allocator()) syntax::CxxNullPtrExpression, S);
     return true;
   }
 
   bool WalkUpFromUnaryOperator(UnaryOperator *S) {

clang/lib/Tooling/Syntax/Nodes.cpp

llvm::raw_ostream &syntax::operator<<(llvm::raw_ostream &OS, NodeKind K) {
   case NodeKind::TranslationUnit:
     return OS << "TranslationUnit";
   case NodeKind::UnknownExpression:
     return OS << "UnknownExpression";
   case NodeKind::CxxNullPtrExpression:
     return OS << "CxxNullPtrExpression";
   case NodeKind::IntegerLiteralExpression:
     return OS << "IntegerLiteralExpression";
+  case NodeKind::FloatingLiteralExpression:
+    return OS << "FloatingLiteralExpression";
   case NodeKind::PrefixUnaryOperatorExpression:
     return OS << "PrefixUnaryOperatorExpression";
   case NodeKind::PostfixUnaryOperatorExpression:
     return OS << "PostfixUnaryOperatorExpression";
   case NodeKind::BinaryOperatorExpression:
     return OS << "BinaryOperatorExpression";
   case NodeKind::UnqualifiedId:
     return OS << "UnqualifiedId";
return llvm::cast_or_null<syntax::NestedNameSpecifier>(
       findChild(syntax::NodeRole::IdExpression_qualifier));
 }
 
 syntax::UnqualifiedId *syntax::IdExpression::unqualifiedId() {
   return llvm::cast_or_null<syntax::UnqualifiedId>(
       findChild(syntax::NodeRole::IdExpression_id));
 }
 
+syntax::Leaf *syntax::FloatingLiteralExpression::literalToken() {
+  return llvm::cast_or_null<syntax::Leaf>(
+      findChild(syntax::NodeRole::LiteralToken));
+}
+
 syntax::Leaf *syntax::IntegerLiteralExpression::literalToken() {
   return llvm::cast_or_null<syntax::Leaf>(
       findChild(syntax::NodeRole::LiteralToken));
 }
 
 syntax::Leaf *syntax::CxxNullPtrExpression::nullPtrKeyword() {
   return llvm::cast_or_null<syntax::Leaf>(
       findChild(syntax::NodeRole::LiteralToken));

clang/unittests/Tooling/Syntax/TreeTest.cpp

return Language == Lang_CXX11 || Language == Lang_CXX14 ||
            Language == Lang_CXX17 || Language == Lang_CXX20;
   }
 
   bool isCXX14OrLater() const {
     return Language == Lang_CXX14 || Language == Lang_CXX17 ||
            Language == Lang_CXX20;
   }
 
+  bool isCXX17OrLater() const {
+    return Language == Lang_CXX17 || Language == Lang_CXX20;
+  }
+
   bool supportsCXXDynamicExceptionSpecification() const {
     return Language == Lang_CXX03 || Language == Lang_CXX11 ||
            Language == Lang_CXX14;
   }
 
   bool hasDelayedTemplateParsing() const {
     return Target == "x86_64-pc-win32-msvc";
   }
`-CompoundStatement
     |-ExpressionStatement
     | |-CxxNullPtrExpression
     | | `-nullptr
     | `-;
     `-}
 )txt"));
 }
 
+TEST_P(SyntaxTreeTest, FloatingLiteral) {
+  EXPECT_TRUE(treeDumpEqual(
+      R"cpp(
+void test() {
+  1e-2;
+  2.;
+  .2;
+  2.f;
+}
+)cpp",
+      R"txt(
+*: TranslationUnit
+`-SimpleDeclaration
+  |-void
+  |-SimpleDeclarator
+  | |-test
+  | `-ParametersAndQualifiers
+  |   |-(
+  |   `-)
+  `-CompoundStatement
+    |-{
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-1e-2
+    | `-;
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-2.
+    | `-;
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-.2
+    | `-;
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-2.f
+    | `-;
+    `-}
+)txt"));
+}
+
+TEST_P(SyntaxTreeTest, FloatingLiteralHexadecimal) {
+  if (!GetParam().isCXX17OrLater()) {
+    return;
+  }
+  EXPECT_TRUE(treeDumpEqual(
+      R"cpp(
+void test() {
+  0xfp1;
+  0xf.p1;
+  0x.fp1;
+  0xf.fp1f;
+}
+)cpp",
+      R"txt(
+*: TranslationUnit
+`-SimpleDeclaration
+  |-void
+  |-SimpleDeclarator
+  | |-test
+  | `-ParametersAndQualifiers
+  |   |-(
+  |   `-)
+  `-CompoundStatement
+    |-{
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-0xfp1
+    | `-;
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-0xf.p1
+    | `-;
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-0x.fp1
+    | `-;
+    |-ExpressionStatement
+    | |-FloatingLiteralExpression
+    | | `-0xf.fp1f
+    | `-;
+    `-}
+)txt"));
+}
+
 TEST_P(SyntaxTreeTest, IntegerLiteral) {
   EXPECT_TRUE(treeDumpEqual(
       R"cpp(
 void test() {
   12;
   12u;
   12l;
   12ul;