mirror of
https://github.com/RGBCube/serenity
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LibJS: Initial class implementation; allow super expressions in object
literal methods; add EnvrionmentRecord fields and methods to LexicalEnvironment Adding EnvrionmentRecord's fields and methods lets us throw an exception when |this| is not initialized, which occurs when the super constructor in a derived class has not yet been called, or when |this| has already been initialized (the super constructor was already called).
This commit is contained in:
Jack Karamanian
Andreas Kling
parent
a535d58cac
commit
7533fd8b02
18 changed files with 967 additions and 92 deletions
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@ -244,6 +244,8 @@ NonnullRefPtr<Statement> Parser::parse_statement()
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{
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auto statement = [this]() -> NonnullRefPtr<Statement> {
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switch (m_parser_state.m_current_token.type()) {
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case TokenType::Class:
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return parse_class_declaration();
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case TokenType::Function: {
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auto declaration = parse_function_node<FunctionDeclaration>();
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m_parser_state.m_function_scopes.last().append(declaration);
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@ -421,6 +423,136 @@ RefPtr<Statement> Parser::try_parse_labelled_statement()
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return statement;
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}
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NonnullRefPtr<ClassDeclaration> Parser::parse_class_declaration()
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{
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return create_ast_node<ClassDeclaration>(parse_class_expression(true));
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}
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NonnullRefPtr<ClassExpression> Parser::parse_class_expression(bool expect_class_name)
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{
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// Classes are always in strict mode.
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TemporaryChange strict_mode_rollback(m_parser_state.m_strict_mode, true);
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consume(TokenType::Class);
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NonnullRefPtrVector<ClassMethod> methods;
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RefPtr<Expression> super_class;
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RefPtr<FunctionExpression> constructor;
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String class_name = expect_class_name || match(TokenType::Identifier) ? consume(TokenType::Identifier).value().to_string() : "";
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if (match(TokenType::Extends)) {
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consume();
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super_class = parse_primary_expression();
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}
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consume(TokenType::CurlyOpen);
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while (!done() && !match(TokenType::CurlyClose)) {
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RefPtr<Expression> property_key;
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bool is_static = false;
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bool is_constructor = false;
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auto method_kind = ClassMethod::Kind::Method;
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if (match(TokenType::Semicolon)) {
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consume();
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continue;
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}
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if (match_property_key()) {
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StringView name;
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if (match(TokenType::Identifier) && m_parser_state.m_current_token.value() == "static") {
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consume();
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is_static = true;
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}
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if (match(TokenType::Identifier)) {
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auto identifier_name = m_parser_state.m_current_token.value();
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if (identifier_name == "get") {
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method_kind = ClassMethod::Kind::Getter;
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consume();
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} else if (identifier_name == "set") {
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method_kind = ClassMethod::Kind::Setter;
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consume();
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}
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}
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if (match_property_key()) {
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switch (m_parser_state.m_current_token.type()) {
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case TokenType::Identifier:
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name = consume().value();
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property_key = create_ast_node<StringLiteral>(name);
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break;
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case TokenType::StringLiteral: {
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auto string_literal = parse_string_literal(consume());
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name = string_literal->value();
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property_key = move(string_literal);
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break;
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}
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default:
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property_key = parse_property_key();
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break;
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}
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} else {
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expected("property key");
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}
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// Constructor may be a StringLiteral or an Identifier.
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if (!is_static && name == "constructor") {
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if (method_kind != ClassMethod::Kind::Method)
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syntax_error("Class constructor may not be an accessor");
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if (!constructor.is_null())
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syntax_error("Classes may not have more than one constructor");
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is_constructor = true;
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}
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}
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if (match(TokenType::ParenOpen)) {
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auto function = parse_function_node<FunctionExpression>(false, true, !super_class.is_null());
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auto arg_count = function->parameters().size();
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if (method_kind == ClassMethod::Kind::Getter && arg_count != 0) {
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syntax_error("Class getter method must have no arguments");
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} else if (method_kind == ClassMethod::Kind::Setter && arg_count != 1) {
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syntax_error("Class setter method must have one argument");
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}
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if (is_constructor) {
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constructor = move(function);
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} else if (!property_key.is_null()) {
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methods.append(create_ast_node<ClassMethod>(property_key.release_nonnull(), move(function), method_kind, is_static));
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} else {
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syntax_error("No key for class method");
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}
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} else {
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expected("ParenOpen");
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consume();
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}
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}
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consume(TokenType::CurlyClose);
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if (constructor.is_null()) {
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auto constructor_body = create_ast_node<BlockStatement>();
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if (!super_class.is_null()) {
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// Set constructor to the result of parsing the source text
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// constructor(... args){ super (...args);}
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auto super_call = create_ast_node<CallExpression>(create_ast_node<SuperExpression>(), Vector { CallExpression::Argument { create_ast_node<Identifier>("args"), true } });
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constructor_body->append(create_ast_node<ExpressionStatement>(move(super_call)));
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constructor_body->add_variables(m_parser_state.m_var_scopes.last());
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constructor = create_ast_node<FunctionExpression>(class_name, move(constructor_body), Vector { FunctionNode::Parameter { "args", nullptr, true } }, 0, NonnullRefPtrVector<VariableDeclaration>());
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} else {
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constructor = create_ast_node<FunctionExpression>(class_name, move(constructor_body), Vector<FunctionNode::Parameter> {}, 0, NonnullRefPtrVector<VariableDeclaration>());
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}
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}
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return create_ast_node<ClassExpression>(move(class_name), move(constructor), move(super_class), move(methods));
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}
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NonnullRefPtr<Expression> Parser::parse_primary_expression()
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{
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if (match_unary_prefixed_expression())
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@ -442,6 +574,13 @@ NonnullRefPtr<Expression> Parser::parse_primary_expression()
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case TokenType::This:
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consume();
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return create_ast_node<ThisExpression>();
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case TokenType::Class:
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return parse_class_expression(false);
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case TokenType::Super:
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consume();
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if (!m_parser_state.m_allow_super_property_lookup)
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syntax_error("'super' keyword unexpected here");
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return create_ast_node<SuperExpression>();
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case TokenType::Identifier: {
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auto arrow_function_result = try_parse_arrow_function_expression(false);
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if (!arrow_function_result.is_null()) {
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@ -537,6 +676,27 @@ NonnullRefPtr<Expression> Parser::parse_unary_prefixed_expression()
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}
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}
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NonnullRefPtr<Expression> Parser::parse_property_key()
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{
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if (match(TokenType::StringLiteral)) {
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return parse_string_literal(consume());
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} else if (match(TokenType::NumericLiteral)) {
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return create_ast_node<StringLiteral>(consume(TokenType::NumericLiteral).value());
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} else if (match(TokenType::BigIntLiteral)) {
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auto value = consume(TokenType::BigIntLiteral).value();
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return create_ast_node<StringLiteral>(value.substring_view(0, value.length() - 1));
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} else if (match(TokenType::BracketOpen)) {
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consume(TokenType::BracketOpen);
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auto result = parse_expression(0);
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consume(TokenType::BracketClose);
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return result;
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} else {
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if (!match_identifier_name())
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expected("IdentifierName");
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return create_ast_node<StringLiteral>(consume().value());
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}
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}
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NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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{
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consume(TokenType::CurlyOpen);
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@ -544,35 +704,6 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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NonnullRefPtrVector<ObjectProperty> properties;
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ObjectProperty::Type property_type;
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auto match_property_key = [&]() -> bool {
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auto type = m_parser_state.m_current_token.type();
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return match_identifier_name()
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|| type == TokenType::BracketOpen
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|| type == TokenType::StringLiteral
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|| type == TokenType::NumericLiteral
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|| type == TokenType::BigIntLiteral;
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};
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auto parse_property_key = [&]() -> NonnullRefPtr<Expression> {
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if (match(TokenType::StringLiteral)) {
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return parse_string_literal(consume());
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} else if (match(TokenType::NumericLiteral)) {
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return create_ast_node<StringLiteral>(consume(TokenType::NumericLiteral).value());
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} else if (match(TokenType::BigIntLiteral)) {
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auto value = consume(TokenType::BigIntLiteral).value();
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return create_ast_node<StringLiteral>(value.substring_view(0, value.length() - 1));
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} else if (match(TokenType::BracketOpen)) {
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consume(TokenType::BracketOpen);
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auto result = parse_expression(0);
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consume(TokenType::BracketClose);
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return result;
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} else {
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if (!match_identifier_name())
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expected("IdentifierName");
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return create_ast_node<StringLiteral>(consume().value());
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}
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};
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auto skip_to_next_property = [&] {
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while (!done() && !match(TokenType::Comma) && !match(TokenType::CurlyOpen))
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consume();
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@ -586,7 +717,7 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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if (match(TokenType::TripleDot)) {
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consume();
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property_name = parse_expression(4);
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properties.append(create_ast_node<ObjectProperty>(*property_name, nullptr, ObjectProperty::Type::Spread));
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properties.append(create_ast_node<ObjectProperty>(*property_name, nullptr, ObjectProperty::Type::Spread, false));
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if (!match(TokenType::Comma))
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break;
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consume(TokenType::Comma);
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@ -622,7 +753,7 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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if (match(TokenType::ParenOpen)) {
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ASSERT(property_name);
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auto function = parse_function_node<FunctionExpression>(false);
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auto function = parse_function_node<FunctionExpression>(false, true);
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auto arg_count = function->parameters().size();
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if (property_type == ObjectProperty::Type::Getter && arg_count != 0) {
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@ -642,7 +773,7 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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continue;
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}
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properties.append(create_ast_node<ObjectProperty>(*property_name, function, property_type));
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properties.append(create_ast_node<ObjectProperty>(*property_name, function, property_type, true));
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} else if (match(TokenType::Colon)) {
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if (!property_name) {
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syntax_error("Expected a property name");
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@ -650,9 +781,9 @@ NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
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continue;
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}
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consume();
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properties.append(create_ast_node<ObjectProperty>(*property_name, parse_expression(2), property_type));
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properties.append(create_ast_node<ObjectProperty>(*property_name, parse_expression(2), property_type, false));
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} else if (property_name && property_value) {
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properties.append(create_ast_node<ObjectProperty>(*property_name, *property_value, property_type));
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properties.append(create_ast_node<ObjectProperty>(*property_name, *property_value, property_type, false));
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} else {
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syntax_error("Expected a property");
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skip_to_next_property();
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@ -976,6 +1107,9 @@ NonnullRefPtr<Expression> Parser::parse_secondary_expression(NonnullRefPtr<Expre
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NonnullRefPtr<CallExpression> Parser::parse_call_expression(NonnullRefPtr<Expression> lhs)
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{
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if (!m_parser_state.m_allow_super_constructor_call && lhs->is_super_expression())
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syntax_error("'super' keyword unexpected here");
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consume(TokenType::ParenOpen);
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Vector<CallExpression::Argument> arguments;
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@ -1085,8 +1219,11 @@ NonnullRefPtr<BlockStatement> Parser::parse_block_statement()
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}
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template<typename FunctionNodeType>
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NonnullRefPtr<FunctionNodeType> Parser::parse_function_node(bool check_for_function_and_name)
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NonnullRefPtr<FunctionNodeType> Parser::parse_function_node(bool check_for_function_and_name, bool allow_super_property_lookup, bool allow_super_constructor_call)
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{
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TemporaryChange super_property_access_rollback(m_parser_state.m_allow_super_property_lookup, allow_super_property_lookup);
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TemporaryChange super_constructor_call_rollback(m_parser_state.m_allow_super_constructor_call, allow_super_constructor_call);
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ScopePusher scope(*this, ScopePusher::Var | ScopePusher::Function);
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if (check_for_function_and_name)
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@ -1465,6 +1602,7 @@ bool Parser::match_expression() const
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|| type == TokenType::ParenOpen
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|| type == TokenType::Function
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|| type == TokenType::This
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|| type == TokenType::Super
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|| type == TokenType::RegexLiteral
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|| match_unary_prefixed_expression();
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}
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@ -1563,6 +1701,16 @@ bool Parser::match_identifier_name() const
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return m_parser_state.m_current_token.is_identifier_name();
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}
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bool Parser::match_property_key() const
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{
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auto type = m_parser_state.m_current_token.type();
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return match_identifier_name()
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|| type == TokenType::BracketOpen
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|| type == TokenType::StringLiteral
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|| type == TokenType::NumericLiteral
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|| type == TokenType::BigIntLiteral;
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}
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bool Parser::done() const
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{
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return match(TokenType::Eof);
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