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https://github.com/SerenityOS/serenity
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LibCpp: Add support for type aliases with typedef/using
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2e2e535abb
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@ -683,4 +683,13 @@ void UsingNamespaceDeclaration::dump(FILE* output, size_t indent) const
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outln(output, "{}", full_name());
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}
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void TypedefDeclaration::dump(FILE* output, size_t indent) const
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{
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ASTNode::dump(output, indent);
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print_indent(output, indent + 1);
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outln(output, "{}", full_name());
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if (m_alias)
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m_alias->dump(output, indent + 1);
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}
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}
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@ -1007,6 +1007,23 @@ public:
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}
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};
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class TypedefDeclaration : public Declaration {
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public:
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virtual ~TypedefDeclaration() override = default;
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virtual StringView class_name() const override { return "TypedefDeclaration"sv; }
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virtual void dump(FILE* = stdout, size_t indent = 0) const override;
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TypedefDeclaration(ASTNode const* parent, Optional<Position> start, Optional<Position> end, DeprecatedString const& filename)
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: Declaration(parent, start, end, filename)
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{
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}
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void set_alias(Type const& alias) { m_alias = alias; }
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Type const* alias() const { return m_alias.ptr(); }
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private:
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RefPtr<Type const> m_alias;
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};
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template<>
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inline bool ASTNode::fast_is<Identifier>() const { return is_identifier(); }
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template<>
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@ -93,6 +93,10 @@ NonnullRefPtr<Declaration const> Parser::parse_declaration(ASTNode const& parent
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return parse_destructor(parent);
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case DeclarationType::UsingNamespace:
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return parse_using_namespace_declaration(parent);
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case DeclarationType::UsingType:
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return parse_using_type_declaration(parent);
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case DeclarationType::Typedef:
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return parse_typedef_declaration(parent);
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default:
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error("unexpected declaration type"sv);
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return create_ast_node<InvalidDeclaration>(parent, position(), position());
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@ -641,6 +645,10 @@ Optional<Parser::DeclarationType> Parser::match_declaration_in_translation_unit(
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return DeclarationType::Variable;
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if (match_using_namespace_declaration())
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return DeclarationType::UsingNamespace;
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if (match_using_type_declaration())
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return DeclarationType::UsingType;
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if (match_typedef_declaration())
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return DeclarationType::Typedef;
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return {};
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}
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@ -1761,6 +1769,41 @@ bool Parser::match_using_namespace_declaration()
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return true;
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}
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bool Parser::match_using_type_declaration()
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{
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save_state();
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ScopeGuard state_guard = [this] { load_state(); };
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if (!match_keyword("using"))
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return false;
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consume();
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if (!match(Token::Type::Identifier))
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return false;
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return true;
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}
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bool Parser::match_typedef_declaration()
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{
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save_state();
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ScopeGuard state_guard = [this] { load_state(); };
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if (!match_keyword("typedef"))
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return false;
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consume();
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// FIXME: typedef void (*fn)()
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if (!match_type())
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return false;
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if (!match(Token::Type::Identifier))
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return false;
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return true;
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}
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NonnullRefPtr<UsingNamespaceDeclaration const> Parser::parse_using_namespace_declaration(ASTNode const& parent)
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{
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auto decl = create_ast_node<UsingNamespaceDeclaration>(parent, position(), {});
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@ -1778,4 +1821,44 @@ NonnullRefPtr<UsingNamespaceDeclaration const> Parser::parse_using_namespace_dec
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return decl;
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}
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NonnullRefPtr<TypedefDeclaration const> Parser::parse_typedef_declaration(Cpp::ASTNode const& parent)
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{
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auto decl = create_ast_node<TypedefDeclaration>(parent, position(), {});
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consume_keyword("typedef");
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auto type = parse_type(*decl);
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decl->set_alias(type);
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auto name = parse_name(*decl);
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decl->set_name(name);
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decl->set_end(position());
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consume(Token::Type::Semicolon);
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return decl;
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}
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NonnullRefPtr<TypedefDeclaration const> Parser::parse_using_type_declaration(Cpp::ASTNode const& parent)
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{
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auto decl = create_ast_node<TypedefDeclaration>(parent, position(), {});
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// FIXME: These can also be templated.
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consume_keyword("using");
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auto name = parse_name(*decl);
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decl->set_name(name);
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if (match(Token::Type::Equals)) {
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consume();
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auto type = parse_type(*decl);
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decl->set_alias(type);
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}
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decl->set_end(position());
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consume(Token::Type::Semicolon);
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return decl;
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}
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}
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@ -50,6 +50,8 @@ private:
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Constructor,
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Destructor,
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UsingNamespace,
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Typedef,
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UsingType,
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};
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Optional<DeclarationType> match_declaration_in_translation_unit();
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@ -82,6 +84,8 @@ private:
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bool match_constructor(StringView class_name);
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bool match_destructor(StringView class_name);
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bool match_using_namespace_declaration();
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bool match_typedef_declaration();
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bool match_using_type_declaration();
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Optional<Vector<NonnullRefPtr<Parameter const>>> parse_parameter_list(ASTNode const& parent);
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Optional<Token> consume_whitespace();
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@ -122,6 +126,8 @@ private:
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NonnullRefPtr<Constructor const> parse_constructor(ASTNode const& parent);
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NonnullRefPtr<Destructor const> parse_destructor(ASTNode const& parent);
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NonnullRefPtr<UsingNamespaceDeclaration const> parse_using_namespace_declaration(ASTNode const& parent);
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NonnullRefPtr<TypedefDeclaration const> parse_typedef_declaration(ASTNode const& parent);
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NonnullRefPtr<TypedefDeclaration const> parse_using_type_declaration(ASTNode const& parent);
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bool match(Token::Type);
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Token consume(Token::Type);
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