mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-26 09:30:24 +00:00
3359 lines
139 KiB
C++
3359 lines
139 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
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* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Parser.h"
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#include <AK/Array.h>
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#include <AK/CharacterTypes.h>
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#include <AK/HashTable.h>
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#include <AK/ScopeGuard.h>
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#include <AK/StdLibExtras.h>
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#include <AK/TemporaryChange.h>
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#include <LibJS/Runtime/RegExpObject.h>
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#include <LibRegex/Regex.h>
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namespace JS {
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static bool statement_is_use_strict_directive(NonnullRefPtr<Statement> statement)
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{
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if (!is<ExpressionStatement>(*statement))
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return false;
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auto& expression_statement = static_cast<ExpressionStatement&>(*statement);
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auto& expression = expression_statement.expression();
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if (!is<StringLiteral>(expression))
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return false;
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return static_cast<const StringLiteral&>(expression).is_use_strict_directive();
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}
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class ScopePusher {
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public:
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enum Type {
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Var = 1,
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Let = 2,
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};
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ScopePusher(Parser& parser, unsigned mask, Parser::Scope::Type scope_type)
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: m_parser(parser)
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, m_mask(mask)
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{
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if (m_mask & Var)
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m_parser.m_state.var_scopes.append(NonnullRefPtrVector<VariableDeclaration>());
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if (m_mask & Let)
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m_parser.m_state.let_scopes.append(NonnullRefPtrVector<VariableDeclaration>());
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m_parser.m_state.current_scope = create<Parser::Scope>(scope_type, m_parser.m_state.current_scope);
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}
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~ScopePusher()
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{
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if (m_mask & Var)
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m_parser.m_state.var_scopes.take_last();
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if (m_mask & Let)
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m_parser.m_state.let_scopes.take_last();
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auto& popped = m_parser.m_state.current_scope;
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// Manual clear required to resolve circular references
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popped->hoisted_function_declarations.clear();
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m_parser.m_state.current_scope = popped->parent;
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}
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void add_to_scope_node(NonnullRefPtr<ScopeNode> scope_node)
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{
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if (m_mask & Var)
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scope_node->add_variables(m_parser.m_state.var_scopes.last());
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if (m_mask & Let)
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scope_node->add_variables(m_parser.m_state.let_scopes.last());
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auto& scope = m_parser.m_state.current_scope;
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scope_node->add_functions(scope->function_declarations);
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for (auto& hoistable_function : scope->hoisted_function_declarations) {
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if (is_hoistable(hoistable_function)) {
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scope_node->add_hoisted_function(hoistable_function.declaration);
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}
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}
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}
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static bool is_hoistable(Parser::Scope::HoistableDeclaration& declaration)
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{
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auto& name = declaration.declaration->name();
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// See if we find any conflicting lexical declaration on the way up
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for (RefPtr<Parser::Scope> scope = declaration.scope; !scope.is_null(); scope = scope->parent) {
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if (scope->lexical_declarations.contains(name)) {
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return false;
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}
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}
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return true;
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}
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Parser& m_parser;
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unsigned m_mask { 0 };
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};
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class OperatorPrecedenceTable {
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public:
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constexpr OperatorPrecedenceTable()
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: m_token_precedence()
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{
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for (size_t i = 0; i < array_size(m_operator_precedence); ++i) {
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auto& op = m_operator_precedence[i];
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m_token_precedence[static_cast<size_t>(op.token)] = op.precedence;
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}
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}
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constexpr int get(TokenType token) const
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{
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int p = m_token_precedence[static_cast<size_t>(token)];
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if (p == 0) {
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warnln("Internal Error: No precedence for operator {}", Token::name(token));
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VERIFY_NOT_REACHED();
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return -1;
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}
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return p;
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}
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private:
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int m_token_precedence[cs_num_of_js_tokens];
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struct OperatorPrecedence {
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TokenType token;
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int precedence;
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};
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
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static constexpr const OperatorPrecedence m_operator_precedence[] = {
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{ TokenType::Period, 20 },
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{ TokenType::BracketOpen, 20 },
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{ TokenType::ParenOpen, 20 },
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{ TokenType::QuestionMarkPeriod, 20 },
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{ TokenType::New, 19 },
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{ TokenType::PlusPlus, 18 },
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{ TokenType::MinusMinus, 18 },
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{ TokenType::ExclamationMark, 17 },
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{ TokenType::Tilde, 17 },
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{ TokenType::Typeof, 17 },
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{ TokenType::Void, 17 },
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{ TokenType::Delete, 17 },
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{ TokenType::Await, 17 },
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{ TokenType::DoubleAsterisk, 16 },
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{ TokenType::Asterisk, 15 },
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{ TokenType::Slash, 15 },
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{ TokenType::Percent, 15 },
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{ TokenType::Plus, 14 },
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{ TokenType::Minus, 14 },
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{ TokenType::ShiftLeft, 13 },
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{ TokenType::ShiftRight, 13 },
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{ TokenType::UnsignedShiftRight, 13 },
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{ TokenType::LessThan, 12 },
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{ TokenType::LessThanEquals, 12 },
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{ TokenType::GreaterThan, 12 },
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{ TokenType::GreaterThanEquals, 12 },
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{ TokenType::In, 12 },
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{ TokenType::Instanceof, 12 },
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{ TokenType::EqualsEquals, 11 },
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{ TokenType::ExclamationMarkEquals, 11 },
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{ TokenType::EqualsEqualsEquals, 11 },
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{ TokenType::ExclamationMarkEqualsEquals, 11 },
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{ TokenType::Ampersand, 10 },
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{ TokenType::Caret, 9 },
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{ TokenType::Pipe, 8 },
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{ TokenType::DoubleQuestionMark, 7 },
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{ TokenType::DoubleAmpersand, 6 },
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{ TokenType::DoublePipe, 5 },
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{ TokenType::QuestionMark, 4 },
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{ TokenType::Equals, 3 },
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{ TokenType::PlusEquals, 3 },
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{ TokenType::MinusEquals, 3 },
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{ TokenType::DoubleAsteriskEquals, 3 },
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{ TokenType::AsteriskEquals, 3 },
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{ TokenType::SlashEquals, 3 },
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{ TokenType::PercentEquals, 3 },
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{ TokenType::ShiftLeftEquals, 3 },
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{ TokenType::ShiftRightEquals, 3 },
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{ TokenType::UnsignedShiftRightEquals, 3 },
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{ TokenType::AmpersandEquals, 3 },
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{ TokenType::CaretEquals, 3 },
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{ TokenType::PipeEquals, 3 },
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{ TokenType::DoubleAmpersandEquals, 3 },
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{ TokenType::DoublePipeEquals, 3 },
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{ TokenType::DoubleQuestionMarkEquals, 3 },
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{ TokenType::Yield, 2 },
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{ TokenType::Comma, 1 },
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};
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};
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constexpr OperatorPrecedenceTable g_operator_precedence;
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Parser::ParserState::ParserState(Lexer l, Program::Type program_type)
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: lexer(move(l))
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{
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if (program_type == Program::Type::Module)
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lexer.disallow_html_comments();
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current_token = lexer.next();
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}
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Parser::Scope::Scope(Parser::Scope::Type type, RefPtr<Parser::Scope> parent_scope)
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: type(type)
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, parent(move(parent_scope))
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{
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}
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RefPtr<Parser::Scope> Parser::Scope::get_current_function_scope()
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{
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if (this->type == Parser::Scope::Function) {
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return *this;
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}
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auto result = this->parent;
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while (result->type != Parser::Scope::Function) {
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result = result->parent;
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}
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return result;
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}
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Parser::Parser(Lexer lexer, Program::Type program_type)
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: m_state(move(lexer), program_type)
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, m_program_type(program_type)
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{
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}
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Associativity Parser::operator_associativity(TokenType type) const
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{
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switch (type) {
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case TokenType::Period:
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case TokenType::BracketOpen:
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case TokenType::ParenOpen:
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case TokenType::QuestionMarkPeriod:
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case TokenType::Asterisk:
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case TokenType::Slash:
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case TokenType::Percent:
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case TokenType::Plus:
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case TokenType::Minus:
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case TokenType::ShiftLeft:
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case TokenType::ShiftRight:
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case TokenType::UnsignedShiftRight:
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case TokenType::LessThan:
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case TokenType::LessThanEquals:
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case TokenType::GreaterThan:
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case TokenType::GreaterThanEquals:
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case TokenType::In:
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case TokenType::Instanceof:
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case TokenType::EqualsEquals:
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case TokenType::ExclamationMarkEquals:
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case TokenType::EqualsEqualsEquals:
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case TokenType::ExclamationMarkEqualsEquals:
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case TokenType::Typeof:
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case TokenType::Void:
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case TokenType::Delete:
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case TokenType::Ampersand:
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case TokenType::Caret:
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case TokenType::Pipe:
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case TokenType::DoubleQuestionMark:
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case TokenType::DoubleAmpersand:
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case TokenType::DoublePipe:
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case TokenType::Comma:
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return Associativity::Left;
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default:
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return Associativity::Right;
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}
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}
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NonnullRefPtr<Program> Parser::parse_program(bool starts_in_strict_mode)
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{
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auto rule_start = push_start();
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ScopePusher scope(*this, ScopePusher::Var | ScopePusher::Let, Scope::Function);
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auto program = adopt_ref(*new Program({ m_filename, rule_start.position(), position() }, m_program_type));
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if (starts_in_strict_mode || m_program_type == Program::Type::Module) {
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program->set_strict_mode();
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m_state.strict_mode = true;
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}
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bool parsing_directives = true;
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while (!done()) {
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if (match_declaration()) {
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program->append(parse_declaration());
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parsing_directives = false;
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} else if (match_statement()) {
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auto statement = parse_statement(AllowLabelledFunction::Yes);
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program->append(statement);
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if (statement_is_use_strict_directive(statement)) {
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if (parsing_directives) {
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program->set_strict_mode();
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m_state.strict_mode = true;
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}
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if (m_state.string_legacy_octal_escape_sequence_in_scope)
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syntax_error("Octal escape sequence in string literal not allowed in strict mode");
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}
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if (parsing_directives && is<ExpressionStatement>(*statement)) {
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auto& expression_statement = static_cast<ExpressionStatement&>(*statement);
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auto& expression = expression_statement.expression();
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parsing_directives = is<StringLiteral>(expression);
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} else {
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parsing_directives = false;
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}
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} else if (match_export_or_import()) {
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VERIFY(m_state.current_token.type() == TokenType::Export || m_state.current_token.type() == TokenType::Import);
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if (m_state.current_token.type() == TokenType::Export)
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program->append_export(parse_export_statement(*program));
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else
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program->append_import(parse_import_statement(*program));
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parsing_directives = false;
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} else {
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expected("statement or declaration");
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consume();
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parsing_directives = false;
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}
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}
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if (m_state.var_scopes.size() == 1) {
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scope.add_to_scope_node(program);
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} else {
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syntax_error("Unclosed lexical_environment");
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}
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program->source_range().end = position();
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return program;
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}
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NonnullRefPtr<Declaration> Parser::parse_declaration()
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{
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auto rule_start = push_start();
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switch (m_state.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_state.current_scope->function_declarations.append(declaration);
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auto hoisting_target = m_state.current_scope->get_current_function_scope();
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hoisting_target->hoisted_function_declarations.append({ declaration, *m_state.current_scope });
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return declaration;
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}
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case TokenType::Let:
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case TokenType::Const:
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return parse_variable_declaration();
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default:
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expected("declaration");
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consume();
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return create_ast_node<ErrorDeclaration>({ m_state.current_token.filename(), rule_start.position(), position() });
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}
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}
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NonnullRefPtr<Statement> Parser::parse_statement(AllowLabelledFunction allow_labelled_function)
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{
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auto rule_start = push_start();
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switch (m_state.current_token.type()) {
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case TokenType::CurlyOpen:
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return parse_block_statement();
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case TokenType::Return:
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return parse_return_statement();
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case TokenType::Var:
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return parse_variable_declaration();
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case TokenType::For:
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return parse_for_statement();
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case TokenType::If:
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return parse_if_statement();
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case TokenType::Throw:
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return parse_throw_statement();
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case TokenType::Try:
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return parse_try_statement();
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case TokenType::Break:
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return parse_break_statement();
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case TokenType::Continue:
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return parse_continue_statement();
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case TokenType::Switch:
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return parse_switch_statement();
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case TokenType::Do:
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return parse_do_while_statement();
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case TokenType::While:
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return parse_while_statement();
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case TokenType::With:
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if (m_state.strict_mode)
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syntax_error("'with' statement not allowed in strict mode");
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return parse_with_statement();
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case TokenType::Debugger:
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return parse_debugger_statement();
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case TokenType::Semicolon:
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consume();
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return create_ast_node<EmptyStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
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case TokenType::Slash:
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case TokenType::SlashEquals:
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m_state.current_token = m_state.lexer.force_slash_as_regex();
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[[fallthrough]];
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default:
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if (m_state.current_token.type() == TokenType::EscapedKeyword
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&& (m_state.strict_mode
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|| (m_state.current_token.value() != "yield"sv && m_state.current_token.value() != "let"sv)))
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syntax_error("Keyword must not contain escaped characters");
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if (match_identifier_name()) {
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auto result = try_parse_labelled_statement(allow_labelled_function);
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if (!result.is_null())
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return result.release_nonnull();
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}
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if (match_expression()) {
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if (match(TokenType::Function))
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syntax_error("Function declaration not allowed in single-statement context");
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auto expr = parse_expression(0);
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consume_or_insert_semicolon();
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return create_ast_node<ExpressionStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expr));
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}
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expected("statement");
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consume();
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return create_ast_node<ErrorStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
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}
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}
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static constexpr AK::Array<StringView, 9> strict_reserved_words = { "implements", "interface", "let", "package", "private", "protected", "public", "static", "yield" };
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static bool is_strict_reserved_word(StringView str)
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{
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return any_of(strict_reserved_words, [&str](StringView const& word) {
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return word == str;
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});
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}
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RefPtr<FunctionExpression> Parser::try_parse_arrow_function_expression(bool expect_parens)
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{
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save_state();
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auto rule_start = push_start();
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ArmedScopeGuard state_rollback_guard = [&] {
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load_state();
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};
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Vector<FunctionNode::Parameter> parameters;
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i32 function_length = -1;
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if (expect_parens) {
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// We have parens around the function parameters and can re-use the same parsing
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// logic used for regular functions: multiple parameters, default values, rest
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// parameter, maybe a trailing comma. If we have a new syntax error afterwards we
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// check if it's about a wrong token (something like duplicate parameter name must
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// not abort), know parsing failed and rollback the parser state.
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auto previous_syntax_errors = m_state.errors.size();
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parameters = parse_formal_parameters(function_length, FunctionNodeParseOptions::IsArrowFunction);
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if (m_state.errors.size() > previous_syntax_errors && m_state.errors[previous_syntax_errors].message.starts_with("Unexpected token"))
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return nullptr;
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if (!match(TokenType::ParenClose))
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return nullptr;
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consume();
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} else {
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// No parens - this must be an identifier followed by arrow. That's it.
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if (!match_identifier() && !match(TokenType::Yield) && !match(TokenType::Await))
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return nullptr;
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auto token = consume_identifier_reference();
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if (m_state.strict_mode && token.value().is_one_of("arguments"sv, "eval"sv))
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syntax_error("BindingIdentifier may not be 'arguments' or 'eval' in strict mode");
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parameters.append({ FlyString { token.value() }, {} });
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}
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// If there's a newline between the closing paren and arrow it's not a valid arrow function,
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// ASI should kick in instead (it'll then fail with "Unexpected token Arrow")
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if (m_state.current_token.trivia_contains_line_terminator())
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return nullptr;
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if (!match(TokenType::Arrow))
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return nullptr;
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consume();
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if (function_length == -1)
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function_length = parameters.size();
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m_state.function_parameters.append(parameters);
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auto old_labels_in_scope = move(m_state.labels_in_scope);
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ScopeGuard guard([&]() {
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m_state.labels_in_scope = move(old_labels_in_scope);
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});
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bool is_strict = false;
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auto function_body_result = [&]() -> RefPtr<BlockStatement> {
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TemporaryChange change(m_state.in_arrow_function_context, true);
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if (match(TokenType::CurlyOpen)) {
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// Parse a function body with statements
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ScopePusher scope(*this, ScopePusher::Var, Scope::Function);
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bool has_binding = any_of(parameters, [](FunctionNode::Parameter const& parameter) {
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return parameter.binding.has<NonnullRefPtr<BindingPattern>>();
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});
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auto body = parse_block_statement(is_strict, has_binding);
|
|
scope.add_to_scope_node(body);
|
|
return body;
|
|
}
|
|
if (match_expression()) {
|
|
// Parse a function body which returns a single expression
|
|
|
|
// FIXME: We synthesize a block with a return statement
|
|
// for arrow function bodies which are a single expression.
|
|
// Esprima generates a single "ArrowFunctionExpression"
|
|
// with a "body" property.
|
|
auto return_expression = parse_expression(2);
|
|
auto return_block = create_ast_node<BlockStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
return_block->append<ReturnStatement>({ m_filename, rule_start.position(), position() }, move(return_expression));
|
|
return return_block;
|
|
}
|
|
// Invalid arrow function body
|
|
return nullptr;
|
|
}();
|
|
|
|
m_state.function_parameters.take_last();
|
|
|
|
if (function_body_result.is_null())
|
|
return nullptr;
|
|
|
|
state_rollback_guard.disarm();
|
|
discard_saved_state();
|
|
auto body = function_body_result.release_nonnull();
|
|
|
|
if (is_strict) {
|
|
for (auto& parameter : parameters) {
|
|
parameter.binding.visit(
|
|
[&](FlyString const& name) {
|
|
check_identifier_name_for_assignment_validity(name, true);
|
|
},
|
|
[&](auto const&) {});
|
|
}
|
|
}
|
|
|
|
return create_ast_node<FunctionExpression>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() }, "", move(body),
|
|
move(parameters), function_length, FunctionKind::Regular, is_strict, true);
|
|
}
|
|
|
|
RefPtr<Statement> Parser::try_parse_labelled_statement(AllowLabelledFunction allow_function)
|
|
{
|
|
save_state();
|
|
auto rule_start = push_start();
|
|
ArmedScopeGuard state_rollback_guard = [&] {
|
|
load_state();
|
|
};
|
|
|
|
if (m_state.current_token.value() == "yield"sv && (m_state.strict_mode || m_state.in_generator_function_context)) {
|
|
syntax_error("'yield' label not allowed in this context");
|
|
return {};
|
|
}
|
|
|
|
auto identifier = consume_identifier_reference().value();
|
|
if (!match(TokenType::Colon))
|
|
return {};
|
|
consume(TokenType::Colon);
|
|
|
|
if (!match_statement())
|
|
return {};
|
|
|
|
if (match(TokenType::Function) && (allow_function == AllowLabelledFunction::No || m_state.strict_mode)) {
|
|
syntax_error("Not allowed to declare a function here");
|
|
return {};
|
|
}
|
|
|
|
if (m_state.labels_in_scope.contains(identifier))
|
|
syntax_error(String::formatted("Label '{}' has already been declared", identifier));
|
|
m_state.labels_in_scope.set(identifier);
|
|
|
|
RefPtr<Statement> labelled_statement;
|
|
|
|
if (match(TokenType::Function)) {
|
|
auto function_declaration = parse_function_node<FunctionDeclaration>();
|
|
m_state.current_scope->function_declarations.append(function_declaration);
|
|
auto hoisting_target = m_state.current_scope->get_current_function_scope();
|
|
hoisting_target->hoisted_function_declarations.append({ function_declaration, *m_state.current_scope });
|
|
if (function_declaration->kind() == FunctionKind::Generator)
|
|
syntax_error("Generator functions cannot be defined in labelled statements");
|
|
|
|
labelled_statement = move(function_declaration);
|
|
} else {
|
|
labelled_statement = parse_statement();
|
|
}
|
|
|
|
m_state.labels_in_scope.remove(identifier);
|
|
|
|
labelled_statement->set_label(identifier);
|
|
state_rollback_guard.disarm();
|
|
discard_saved_state();
|
|
return labelled_statement.release_nonnull();
|
|
}
|
|
|
|
RefPtr<MetaProperty> Parser::try_parse_new_target_expression()
|
|
{
|
|
save_state();
|
|
auto rule_start = push_start();
|
|
ArmedScopeGuard state_rollback_guard = [&] {
|
|
load_state();
|
|
};
|
|
|
|
consume(TokenType::New);
|
|
if (!match(TokenType::Period))
|
|
return {};
|
|
consume();
|
|
if (!match(TokenType::Identifier))
|
|
return {};
|
|
// The string 'target' cannot have escapes so we check original value.
|
|
if (consume().original_value() != "target"sv)
|
|
return {};
|
|
|
|
state_rollback_guard.disarm();
|
|
discard_saved_state();
|
|
return create_ast_node<MetaProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, MetaProperty::Type::NewTarget);
|
|
}
|
|
|
|
NonnullRefPtr<ClassDeclaration> Parser::parse_class_declaration()
|
|
{
|
|
auto rule_start = push_start();
|
|
return create_ast_node<ClassDeclaration>({ m_state.current_token.filename(), rule_start.position(), position() }, parse_class_expression(true));
|
|
}
|
|
|
|
NonnullRefPtr<ClassExpression> Parser::parse_class_expression(bool expect_class_name)
|
|
{
|
|
auto rule_start = push_start();
|
|
// Classes are always in strict mode.
|
|
TemporaryChange strict_mode_rollback(m_state.strict_mode, true);
|
|
|
|
consume(TokenType::Class);
|
|
|
|
NonnullRefPtrVector<ClassMethod> methods;
|
|
RefPtr<Expression> super_class;
|
|
RefPtr<FunctionExpression> constructor;
|
|
|
|
String class_name = expect_class_name || match_identifier() || match(TokenType::Yield) || match(TokenType::Await)
|
|
? consume_identifier_reference().value().to_string()
|
|
: "";
|
|
|
|
check_identifier_name_for_assignment_validity(class_name, true);
|
|
if (match(TokenType::Extends)) {
|
|
consume();
|
|
auto [expression, should_continue_parsing] = parse_primary_expression();
|
|
|
|
// Basically a (much) simplified parse_secondary_expression().
|
|
for (;;) {
|
|
if (match(TokenType::TemplateLiteralStart)) {
|
|
auto template_literal = parse_template_literal(true);
|
|
expression = create_ast_node<TaggedTemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expression), move(template_literal));
|
|
continue;
|
|
}
|
|
if (match(TokenType::BracketOpen) || match(TokenType::Period) || match(TokenType::ParenOpen)) {
|
|
auto precedence = g_operator_precedence.get(m_state.current_token.type());
|
|
expression = parse_secondary_expression(move(expression), precedence);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
super_class = move(expression);
|
|
(void)should_continue_parsing;
|
|
}
|
|
|
|
consume(TokenType::CurlyOpen);
|
|
|
|
while (!done() && !match(TokenType::CurlyClose)) {
|
|
RefPtr<Expression> property_key;
|
|
bool is_static = false;
|
|
bool is_constructor = false;
|
|
bool is_generator = false;
|
|
auto method_kind = ClassMethod::Kind::Method;
|
|
|
|
if (match(TokenType::Semicolon)) {
|
|
consume();
|
|
continue;
|
|
}
|
|
|
|
if (match(TokenType::Asterisk)) {
|
|
consume();
|
|
is_generator = true;
|
|
}
|
|
|
|
if (match_property_key()) {
|
|
StringView name;
|
|
if (!is_generator && m_state.current_token.original_value() == "static"sv) {
|
|
if (match(TokenType::Identifier)) {
|
|
consume();
|
|
is_static = true;
|
|
if (match(TokenType::Asterisk)) {
|
|
consume();
|
|
is_generator = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (match(TokenType::Identifier)) {
|
|
auto identifier_name = m_state.current_token.value();
|
|
|
|
if (identifier_name == "get") {
|
|
method_kind = ClassMethod::Kind::Getter;
|
|
consume();
|
|
} else if (identifier_name == "set") {
|
|
method_kind = ClassMethod::Kind::Setter;
|
|
consume();
|
|
}
|
|
}
|
|
|
|
if (match_property_key()) {
|
|
switch (m_state.current_token.type()) {
|
|
case TokenType::Identifier:
|
|
name = consume().value();
|
|
property_key = create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, name);
|
|
break;
|
|
case TokenType::StringLiteral: {
|
|
auto string_literal = parse_string_literal(consume());
|
|
name = string_literal->value();
|
|
property_key = move(string_literal);
|
|
break;
|
|
}
|
|
default:
|
|
property_key = parse_property_key();
|
|
break;
|
|
}
|
|
|
|
//https://tc39.es/ecma262/#sec-class-definitions-static-semantics-early-errors
|
|
// ClassElement : static MethodDefinition
|
|
// It is a Syntax Error if PropName of MethodDefinition is "prototype".
|
|
if (is_static && name == "prototype"sv)
|
|
syntax_error("Classes may not have a static property named 'prototype'");
|
|
} else if (match(TokenType::ParenOpen) && (is_static || method_kind != ClassMethod::Kind::Method)) {
|
|
switch (method_kind) {
|
|
case ClassMethod::Kind::Method:
|
|
VERIFY(is_static);
|
|
name = "static";
|
|
is_static = false;
|
|
break;
|
|
case ClassMethod::Kind::Getter:
|
|
name = "get";
|
|
method_kind = ClassMethod::Kind::Method;
|
|
break;
|
|
case ClassMethod::Kind::Setter:
|
|
name = "set";
|
|
method_kind = ClassMethod::Kind::Method;
|
|
break;
|
|
}
|
|
property_key = create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, name);
|
|
} else {
|
|
expected("property key");
|
|
}
|
|
|
|
// Constructor may be a StringLiteral or an Identifier.
|
|
if (!is_static && name == "constructor") {
|
|
if (method_kind != ClassMethod::Kind::Method)
|
|
syntax_error("Class constructor may not be an accessor");
|
|
if (!constructor.is_null())
|
|
syntax_error("Classes may not have more than one constructor");
|
|
if (is_generator)
|
|
syntax_error("Class constructor may not be a generator");
|
|
|
|
is_constructor = true;
|
|
}
|
|
}
|
|
|
|
if (match(TokenType::ParenOpen)) {
|
|
u8 parse_options = FunctionNodeParseOptions::AllowSuperPropertyLookup;
|
|
if (!super_class.is_null() && !is_static && is_constructor)
|
|
parse_options |= FunctionNodeParseOptions::AllowSuperConstructorCall;
|
|
if (method_kind == ClassMethod::Kind::Getter)
|
|
parse_options |= FunctionNodeParseOptions::IsGetterFunction;
|
|
if (method_kind == ClassMethod::Kind::Setter)
|
|
parse_options |= FunctionNodeParseOptions::IsSetterFunction;
|
|
if (is_generator)
|
|
parse_options |= FunctionNodeParseOptions::IsGeneratorFunction;
|
|
auto function = parse_function_node<FunctionExpression>(parse_options);
|
|
if (is_constructor) {
|
|
constructor = move(function);
|
|
} else if (!property_key.is_null()) {
|
|
methods.append(create_ast_node<ClassMethod>({ m_state.current_token.filename(), rule_start.position(), position() }, property_key.release_nonnull(), move(function), method_kind, is_static));
|
|
} else {
|
|
syntax_error("No key for class method");
|
|
}
|
|
} else {
|
|
expected("ParenOpen");
|
|
consume();
|
|
}
|
|
}
|
|
|
|
consume(TokenType::CurlyClose);
|
|
|
|
if (constructor.is_null()) {
|
|
auto constructor_body = create_ast_node<BlockStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
if (!super_class.is_null()) {
|
|
// Set constructor to the result of parsing the source text
|
|
// constructor(... args){ super (...args);}
|
|
auto super_call = create_ast_node<SuperCall>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
Vector { CallExpression::Argument { create_ast_node<Identifier>({ m_state.current_token.filename(), rule_start.position(), position() }, "args"), true } });
|
|
constructor_body->append(create_ast_node<ExpressionStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(super_call)));
|
|
constructor_body->add_variables(m_state.var_scopes.last());
|
|
|
|
constructor = create_ast_node<FunctionExpression>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() }, class_name, move(constructor_body),
|
|
Vector { FunctionNode::Parameter { FlyString { "args" }, nullptr, true } }, 0, FunctionKind::Regular, true);
|
|
} else {
|
|
constructor = create_ast_node<FunctionExpression>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() }, class_name, move(constructor_body),
|
|
Vector<FunctionNode::Parameter> {}, 0, FunctionKind::Regular, true);
|
|
}
|
|
}
|
|
|
|
return create_ast_node<ClassExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(class_name), move(constructor), move(super_class), move(methods));
|
|
}
|
|
|
|
Parser::PrimaryExpressionParseResult Parser::parse_primary_expression()
|
|
{
|
|
auto rule_start = push_start();
|
|
if (match_unary_prefixed_expression())
|
|
return { parse_unary_prefixed_expression() };
|
|
|
|
switch (m_state.current_token.type()) {
|
|
case TokenType::ParenOpen: {
|
|
auto paren_position = position();
|
|
consume(TokenType::ParenOpen);
|
|
if ((match(TokenType::ParenClose) || match_identifier() || match(TokenType::TripleDot) || match(TokenType::CurlyOpen) || match(TokenType::BracketOpen))
|
|
&& !try_parse_arrow_function_expression_failed_at_position(paren_position)) {
|
|
|
|
auto arrow_function_result = try_parse_arrow_function_expression(true);
|
|
if (!arrow_function_result.is_null())
|
|
return { arrow_function_result.release_nonnull(), false };
|
|
|
|
set_try_parse_arrow_function_expression_failed_at_position(paren_position, true);
|
|
}
|
|
auto expression = parse_expression(0);
|
|
consume(TokenType::ParenClose);
|
|
if (is<FunctionExpression>(*expression)) {
|
|
auto& function = static_cast<FunctionExpression&>(*expression);
|
|
function.set_cannot_auto_rename();
|
|
if (function.kind() == FunctionKind::Generator && function.name() == "yield"sv)
|
|
syntax_error("function is not allowed to be called 'yield' in this context", function.source_range().start);
|
|
}
|
|
return { move(expression) };
|
|
}
|
|
case TokenType::This:
|
|
consume();
|
|
return { create_ast_node<ThisExpression>({ m_state.current_token.filename(), rule_start.position(), position() }) };
|
|
case TokenType::Class:
|
|
return { parse_class_expression(false) };
|
|
case TokenType::Super:
|
|
consume();
|
|
if (!m_state.allow_super_property_lookup)
|
|
syntax_error("'super' keyword unexpected here");
|
|
return { create_ast_node<SuperExpression>({ m_state.current_token.filename(), rule_start.position(), position() }) };
|
|
case TokenType::EscapedKeyword:
|
|
syntax_error("Keyword must not contain escaped characters");
|
|
[[fallthrough]];
|
|
case TokenType::Identifier: {
|
|
read_as_identifier:;
|
|
if (!try_parse_arrow_function_expression_failed_at_position(position())) {
|
|
auto arrow_function_result = try_parse_arrow_function_expression(false);
|
|
if (!arrow_function_result.is_null())
|
|
return { arrow_function_result.release_nonnull(), false };
|
|
|
|
set_try_parse_arrow_function_expression_failed_at_position(position(), true);
|
|
}
|
|
auto string = consume().value();
|
|
// This could be 'eval' or 'arguments' and thus needs a custom check (`eval[1] = true`)
|
|
if (m_state.strict_mode && (string == "let" || is_strict_reserved_word(string)))
|
|
syntax_error(String::formatted("Identifier must not be a reserved word in strict mode ('{}')", string));
|
|
return { create_ast_node<Identifier>({ m_state.current_token.filename(), rule_start.position(), position() }, string) };
|
|
}
|
|
case TokenType::NumericLiteral:
|
|
return { create_ast_node<NumericLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, consume_and_validate_numeric_literal().double_value()) };
|
|
case TokenType::BigIntLiteral:
|
|
return { create_ast_node<BigIntLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().value()) };
|
|
case TokenType::BoolLiteral:
|
|
return { create_ast_node<BooleanLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().bool_value()) };
|
|
case TokenType::StringLiteral:
|
|
return { parse_string_literal(consume()) };
|
|
case TokenType::NullLiteral:
|
|
consume();
|
|
return { create_ast_node<NullLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }) };
|
|
case TokenType::CurlyOpen:
|
|
return { parse_object_expression() };
|
|
case TokenType::Function:
|
|
return { parse_function_node<FunctionExpression>() };
|
|
case TokenType::BracketOpen:
|
|
return { parse_array_expression() };
|
|
case TokenType::RegexLiteral:
|
|
return { parse_regexp_literal() };
|
|
case TokenType::TemplateLiteralStart:
|
|
return { parse_template_literal(false) };
|
|
case TokenType::New: {
|
|
auto new_start = position();
|
|
auto new_target_result = try_parse_new_target_expression();
|
|
if (!new_target_result.is_null()) {
|
|
if (!m_state.in_function_context)
|
|
syntax_error("'new.target' not allowed outside of a function", new_start);
|
|
return { new_target_result.release_nonnull() };
|
|
}
|
|
return { parse_new_expression() };
|
|
}
|
|
case TokenType::Yield:
|
|
if (!m_state.in_generator_function_context)
|
|
goto read_as_identifier;
|
|
return { parse_yield_expression(), false };
|
|
default:
|
|
if (match_identifier_name())
|
|
goto read_as_identifier;
|
|
expected("primary expression");
|
|
consume();
|
|
return { create_ast_node<ErrorExpression>({ m_state.current_token.filename(), rule_start.position(), position() }) };
|
|
}
|
|
}
|
|
|
|
NonnullRefPtr<RegExpLiteral> Parser::parse_regexp_literal()
|
|
{
|
|
auto rule_start = push_start();
|
|
auto pattern = consume().value();
|
|
// Remove leading and trailing slash.
|
|
pattern = pattern.substring_view(1, pattern.length() - 2);
|
|
|
|
auto flags = String::empty();
|
|
auto parsed_flags = RegExpObject::default_flags;
|
|
|
|
if (match(TokenType::RegexFlags)) {
|
|
auto flags_start = position();
|
|
flags = consume().value();
|
|
|
|
auto parsed_flags_or_error = regex_flags_from_string(flags);
|
|
if (parsed_flags_or_error.is_error())
|
|
syntax_error(parsed_flags_or_error.release_error(), flags_start);
|
|
else
|
|
parsed_flags = parsed_flags_or_error.release_value();
|
|
}
|
|
|
|
auto parsed_pattern = parse_regex_pattern(pattern, parsed_flags.has_flag_set(ECMAScriptFlags::Unicode));
|
|
auto parsed_regex = Regex<ECMA262>::parse_pattern(parsed_pattern, parsed_flags);
|
|
|
|
if (parsed_regex.error != regex::Error::NoError)
|
|
syntax_error(String::formatted("RegExp compile error: {}", Regex<ECMA262>(parsed_regex, parsed_pattern, parsed_flags).error_string()), rule_start.position());
|
|
|
|
SourceRange range { m_state.current_token.filename(), rule_start.position(), position() };
|
|
return create_ast_node<RegExpLiteral>(move(range), move(parsed_regex), move(parsed_pattern), move(parsed_flags), pattern.to_string(), move(flags));
|
|
}
|
|
|
|
NonnullRefPtr<Expression> Parser::parse_unary_prefixed_expression()
|
|
{
|
|
auto rule_start = push_start();
|
|
auto precedence = g_operator_precedence.get(m_state.current_token.type());
|
|
auto associativity = operator_associativity(m_state.current_token.type());
|
|
switch (m_state.current_token.type()) {
|
|
case TokenType::PlusPlus: {
|
|
consume();
|
|
auto rhs_start = position();
|
|
auto rhs = parse_expression(precedence, associativity);
|
|
// FIXME: Apparently for functions this should also not be enforced on a parser level,
|
|
// other engines throw ReferenceError for ++foo()
|
|
if (!is<Identifier>(*rhs) && !is<MemberExpression>(*rhs))
|
|
syntax_error(String::formatted("Right-hand side of prefix increment operator must be identifier or member expression, got {}", rhs->class_name()), rhs_start);
|
|
|
|
if (m_state.strict_mode && is<Identifier>(*rhs)) {
|
|
auto& identifier = static_cast<Identifier&>(*rhs);
|
|
auto& name = identifier.string();
|
|
check_identifier_name_for_assignment_validity(name);
|
|
}
|
|
|
|
return create_ast_node<UpdateExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UpdateOp::Increment, move(rhs), true);
|
|
}
|
|
case TokenType::MinusMinus: {
|
|
consume();
|
|
auto rhs_start = position();
|
|
auto rhs = parse_expression(precedence, associativity);
|
|
// FIXME: Apparently for functions this should also not be enforced on a parser level,
|
|
// other engines throw ReferenceError for --foo()
|
|
if (!is<Identifier>(*rhs) && !is<MemberExpression>(*rhs))
|
|
syntax_error(String::formatted("Right-hand side of prefix decrement operator must be identifier or member expression, got {}", rhs->class_name()), rhs_start);
|
|
|
|
if (m_state.strict_mode && is<Identifier>(*rhs)) {
|
|
auto& identifier = static_cast<Identifier&>(*rhs);
|
|
auto& name = identifier.string();
|
|
check_identifier_name_for_assignment_validity(name);
|
|
}
|
|
|
|
return create_ast_node<UpdateExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UpdateOp::Decrement, move(rhs), true);
|
|
}
|
|
case TokenType::ExclamationMark:
|
|
consume();
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::Not, parse_expression(precedence, associativity));
|
|
case TokenType::Tilde:
|
|
consume();
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::BitwiseNot, parse_expression(precedence, associativity));
|
|
case TokenType::Plus:
|
|
consume();
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::Plus, parse_expression(precedence, associativity));
|
|
case TokenType::Minus:
|
|
consume();
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::Minus, parse_expression(precedence, associativity));
|
|
case TokenType::Typeof:
|
|
consume();
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::Typeof, parse_expression(precedence, associativity));
|
|
case TokenType::Void:
|
|
consume();
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::Void, parse_expression(precedence, associativity));
|
|
case TokenType::Delete: {
|
|
consume();
|
|
auto rhs_start = position();
|
|
auto rhs = parse_expression(precedence, associativity);
|
|
if (is<Identifier>(*rhs) && m_state.strict_mode) {
|
|
syntax_error("Delete of an unqualified identifier in strict mode.", rhs_start);
|
|
}
|
|
return create_ast_node<UnaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UnaryOp::Delete, move(rhs));
|
|
}
|
|
default:
|
|
expected("primary expression");
|
|
consume();
|
|
return create_ast_node<ErrorExpression>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
}
|
|
}
|
|
|
|
NonnullRefPtr<Expression> Parser::parse_property_key()
|
|
{
|
|
auto rule_start = push_start();
|
|
if (match(TokenType::StringLiteral)) {
|
|
return parse_string_literal(consume());
|
|
} else if (match(TokenType::NumericLiteral)) {
|
|
return create_ast_node<NumericLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().double_value());
|
|
} else if (match(TokenType::BigIntLiteral)) {
|
|
return create_ast_node<BigIntLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().value());
|
|
} else if (match(TokenType::BracketOpen)) {
|
|
consume(TokenType::BracketOpen);
|
|
auto result = parse_expression(2);
|
|
consume(TokenType::BracketClose);
|
|
return result;
|
|
} else {
|
|
if (!match_identifier_name())
|
|
expected("IdentifierName");
|
|
return create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().value());
|
|
}
|
|
}
|
|
|
|
NonnullRefPtr<ObjectExpression> Parser::parse_object_expression()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::CurlyOpen);
|
|
|
|
NonnullRefPtrVector<ObjectProperty> properties;
|
|
ObjectProperty::Type property_type;
|
|
Optional<SourceRange> invalid_object_literal_property_range;
|
|
|
|
auto skip_to_next_property = [&] {
|
|
while (!done() && !match(TokenType::Comma) && !match(TokenType::CurlyOpen))
|
|
consume();
|
|
};
|
|
|
|
// It is a Syntax Error if PropertyNameList of PropertyDefinitionList contains any duplicate
|
|
// entries for "__proto__" and at least two of those entries were obtained from productions of
|
|
// the form PropertyDefinition : PropertyName : AssignmentExpression .
|
|
bool has_direct_proto_property = false;
|
|
|
|
while (!done() && !match(TokenType::CurlyClose)) {
|
|
property_type = ObjectProperty::Type::KeyValue;
|
|
RefPtr<Expression> property_name;
|
|
RefPtr<Expression> property_value;
|
|
FunctionKind function_kind { FunctionKind::Regular };
|
|
|
|
if (match(TokenType::TripleDot)) {
|
|
consume();
|
|
property_name = parse_expression(4);
|
|
properties.append(create_ast_node<ObjectProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, *property_name, nullptr, ObjectProperty::Type::Spread, false));
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
consume(TokenType::Comma);
|
|
continue;
|
|
}
|
|
|
|
auto type = m_state.current_token.type();
|
|
|
|
if (match(TokenType::Asterisk)) {
|
|
consume();
|
|
property_type = ObjectProperty::Type::KeyValue;
|
|
property_name = parse_property_key();
|
|
function_kind = FunctionKind ::Generator;
|
|
} else if (match_identifier()) {
|
|
auto identifier = consume().value();
|
|
if (identifier == "get" && match_property_key()) {
|
|
property_type = ObjectProperty::Type::Getter;
|
|
property_name = parse_property_key();
|
|
} else if (identifier == "set" && match_property_key()) {
|
|
property_type = ObjectProperty::Type::Setter;
|
|
property_name = parse_property_key();
|
|
} else {
|
|
property_name = create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, identifier);
|
|
property_value = create_ast_node<Identifier>({ m_state.current_token.filename(), rule_start.position(), position() }, identifier);
|
|
}
|
|
} else {
|
|
property_name = parse_property_key();
|
|
}
|
|
|
|
bool is_proto = (type == TokenType::StringLiteral || type == TokenType::Identifier) && is<StringLiteral>(*property_name) && static_cast<StringLiteral const&>(*property_name).value() == "__proto__";
|
|
|
|
if (property_type == ObjectProperty::Type::Getter || property_type == ObjectProperty::Type::Setter) {
|
|
if (!match(TokenType::ParenOpen)) {
|
|
expected("'(' for object getter or setter property");
|
|
skip_to_next_property();
|
|
continue;
|
|
}
|
|
}
|
|
if (match(TokenType::Equals)) {
|
|
// Not a valid object literal, but a valid assignment target
|
|
consume();
|
|
// Parse the expression and throw it away
|
|
auto expression = parse_expression(2);
|
|
if (!invalid_object_literal_property_range.has_value())
|
|
invalid_object_literal_property_range = expression->source_range();
|
|
} else if (match(TokenType::ParenOpen)) {
|
|
VERIFY(property_name);
|
|
u8 parse_options = FunctionNodeParseOptions::AllowSuperPropertyLookup;
|
|
if (property_type == ObjectProperty::Type::Getter)
|
|
parse_options |= FunctionNodeParseOptions::IsGetterFunction;
|
|
if (property_type == ObjectProperty::Type::Setter)
|
|
parse_options |= FunctionNodeParseOptions::IsSetterFunction;
|
|
if (function_kind == FunctionKind::Generator)
|
|
parse_options |= FunctionNodeParseOptions::IsGeneratorFunction;
|
|
auto function = parse_function_node<FunctionExpression>(parse_options);
|
|
properties.append(create_ast_node<ObjectProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, *property_name, function, property_type, true));
|
|
} else if (match(TokenType::Colon)) {
|
|
if (!property_name) {
|
|
expected("a property name");
|
|
skip_to_next_property();
|
|
continue;
|
|
}
|
|
consume();
|
|
if (is_proto) {
|
|
if (has_direct_proto_property)
|
|
syntax_error("Property name '__proto__' must not appear more than once in object literal");
|
|
has_direct_proto_property = true;
|
|
}
|
|
properties.append(create_ast_node<ObjectProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, *property_name, parse_expression(2), property_type, false));
|
|
} else if (property_name && property_value) {
|
|
properties.append(create_ast_node<ObjectProperty>({ m_state.current_token.filename(), rule_start.position(), position() }, *property_name, *property_value, property_type, false));
|
|
} else {
|
|
expected("a property");
|
|
skip_to_next_property();
|
|
continue;
|
|
}
|
|
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
consume(TokenType::Comma);
|
|
}
|
|
|
|
consume(TokenType::CurlyClose);
|
|
return create_ast_node<ObjectExpression>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
move(properties),
|
|
move(invalid_object_literal_property_range));
|
|
}
|
|
|
|
NonnullRefPtr<ArrayExpression> Parser::parse_array_expression()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::BracketOpen);
|
|
|
|
Vector<RefPtr<Expression>> elements;
|
|
while (match_expression() || match(TokenType::TripleDot) || match(TokenType::Comma)) {
|
|
RefPtr<Expression> expression;
|
|
|
|
if (match(TokenType::TripleDot)) {
|
|
consume(TokenType::TripleDot);
|
|
expression = create_ast_node<SpreadExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, parse_expression(2));
|
|
} else if (match_expression()) {
|
|
expression = parse_expression(2);
|
|
}
|
|
|
|
elements.append(expression);
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
consume(TokenType::Comma);
|
|
}
|
|
|
|
consume(TokenType::BracketClose);
|
|
return create_ast_node<ArrayExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(elements));
|
|
}
|
|
|
|
NonnullRefPtr<StringLiteral> Parser::parse_string_literal(const Token& token, bool in_template_literal)
|
|
{
|
|
auto rule_start = push_start();
|
|
auto status = Token::StringValueStatus::Ok;
|
|
auto string = token.string_value(status);
|
|
if (status != Token::StringValueStatus::Ok) {
|
|
String message;
|
|
if (status == Token::StringValueStatus::LegacyOctalEscapeSequence) {
|
|
m_state.string_legacy_octal_escape_sequence_in_scope = true;
|
|
if (in_template_literal)
|
|
message = "Octal escape sequence not allowed in template literal";
|
|
else if (m_state.strict_mode)
|
|
message = "Octal escape sequence in string literal not allowed in strict mode";
|
|
} else if (status == Token::StringValueStatus::MalformedHexEscape || status == Token::StringValueStatus::MalformedUnicodeEscape) {
|
|
auto type = status == Token::StringValueStatus::MalformedUnicodeEscape ? "unicode" : "hexadecimal";
|
|
message = String::formatted("Malformed {} escape sequence", type);
|
|
} else if (status == Token::StringValueStatus::UnicodeEscapeOverflow) {
|
|
message = "Unicode code_point must not be greater than 0x10ffff in escape sequence";
|
|
} else {
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
|
|
if (!message.is_empty())
|
|
syntax_error(message, Position { token.line_number(), token.line_column() });
|
|
}
|
|
|
|
auto is_use_strict_directive = !in_template_literal && (token.value() == "'use strict'" || token.value() == "\"use strict\"");
|
|
|
|
return create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, string, is_use_strict_directive);
|
|
}
|
|
|
|
NonnullRefPtr<TemplateLiteral> Parser::parse_template_literal(bool is_tagged)
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::TemplateLiteralStart);
|
|
|
|
NonnullRefPtrVector<Expression> expressions;
|
|
NonnullRefPtrVector<Expression> raw_strings;
|
|
|
|
auto append_empty_string = [this, &rule_start, &expressions, &raw_strings, is_tagged]() {
|
|
auto string_literal = create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, "");
|
|
expressions.append(string_literal);
|
|
if (is_tagged)
|
|
raw_strings.append(string_literal);
|
|
};
|
|
|
|
if (!match(TokenType::TemplateLiteralString))
|
|
append_empty_string();
|
|
|
|
while (!done() && !match(TokenType::TemplateLiteralEnd) && !match(TokenType::UnterminatedTemplateLiteral)) {
|
|
if (match(TokenType::TemplateLiteralString)) {
|
|
auto token = consume();
|
|
expressions.append(parse_string_literal(token, true));
|
|
if (is_tagged)
|
|
raw_strings.append(create_ast_node<StringLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, token.value()));
|
|
} else if (match(TokenType::TemplateLiteralExprStart)) {
|
|
consume(TokenType::TemplateLiteralExprStart);
|
|
if (match(TokenType::TemplateLiteralExprEnd)) {
|
|
syntax_error("Empty template literal expression block");
|
|
return create_ast_node<TemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, expressions);
|
|
}
|
|
|
|
expressions.append(parse_expression(0));
|
|
if (match(TokenType::UnterminatedTemplateLiteral)) {
|
|
syntax_error("Unterminated template literal");
|
|
return create_ast_node<TemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, expressions);
|
|
}
|
|
consume(TokenType::TemplateLiteralExprEnd);
|
|
|
|
if (!match(TokenType::TemplateLiteralString))
|
|
append_empty_string();
|
|
} else {
|
|
expected("Template literal string or expression");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (match(TokenType::UnterminatedTemplateLiteral)) {
|
|
syntax_error("Unterminated template literal");
|
|
} else {
|
|
consume(TokenType::TemplateLiteralEnd);
|
|
}
|
|
|
|
if (is_tagged)
|
|
return create_ast_node<TemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, expressions, raw_strings);
|
|
return create_ast_node<TemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, expressions);
|
|
}
|
|
|
|
NonnullRefPtr<Expression> Parser::parse_expression(int min_precedence, Associativity associativity, const Vector<TokenType>& forbidden)
|
|
{
|
|
auto rule_start = push_start();
|
|
auto [expression, should_continue_parsing] = parse_primary_expression();
|
|
auto check_for_invalid_object_property = [&](auto& expression) {
|
|
if (is<ObjectExpression>(*expression)) {
|
|
if (auto range = static_cast<ObjectExpression&>(*expression).invalid_property_range(); range.has_value())
|
|
syntax_error("Invalid property in object literal", range->start);
|
|
}
|
|
};
|
|
while (match(TokenType::TemplateLiteralStart)) {
|
|
auto template_literal = parse_template_literal(true);
|
|
expression = create_ast_node<TaggedTemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expression), move(template_literal));
|
|
}
|
|
if (should_continue_parsing) {
|
|
while (match_secondary_expression(forbidden)) {
|
|
int new_precedence = g_operator_precedence.get(m_state.current_token.type());
|
|
if (new_precedence < min_precedence)
|
|
break;
|
|
if (new_precedence == min_precedence && associativity == Associativity::Left)
|
|
break;
|
|
check_for_invalid_object_property(expression);
|
|
|
|
Associativity new_associativity = operator_associativity(m_state.current_token.type());
|
|
expression = parse_secondary_expression(move(expression), new_precedence, new_associativity);
|
|
while (match(TokenType::TemplateLiteralStart) && !is<UpdateExpression>(*expression)) {
|
|
auto template_literal = parse_template_literal(true);
|
|
expression = create_ast_node<TaggedTemplateLiteral>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expression), move(template_literal));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (is<SuperExpression>(*expression))
|
|
syntax_error("'super' keyword unexpected here");
|
|
|
|
check_for_invalid_object_property(expression);
|
|
|
|
if (match(TokenType::Comma) && min_precedence <= 1) {
|
|
NonnullRefPtrVector<Expression> expressions;
|
|
expressions.append(expression);
|
|
while (match(TokenType::Comma)) {
|
|
consume();
|
|
expressions.append(parse_expression(2));
|
|
}
|
|
expression = create_ast_node<SequenceExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expressions));
|
|
}
|
|
return expression;
|
|
}
|
|
|
|
NonnullRefPtr<Expression> Parser::parse_secondary_expression(NonnullRefPtr<Expression> lhs, int min_precedence, Associativity associativity)
|
|
{
|
|
auto rule_start = push_start();
|
|
switch (m_state.current_token.type()) {
|
|
case TokenType::Plus:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::Addition, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::PlusEquals:
|
|
return parse_assignment_expression(AssignmentOp::AdditionAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Minus:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::Subtraction, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::MinusEquals:
|
|
return parse_assignment_expression(AssignmentOp::SubtractionAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Asterisk:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::Multiplication, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::AsteriskEquals:
|
|
return parse_assignment_expression(AssignmentOp::MultiplicationAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Slash:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::Division, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::SlashEquals:
|
|
return parse_assignment_expression(AssignmentOp::DivisionAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Percent:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::Modulo, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::PercentEquals:
|
|
return parse_assignment_expression(AssignmentOp::ModuloAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::DoubleAsterisk:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::Exponentiation, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::DoubleAsteriskEquals:
|
|
return parse_assignment_expression(AssignmentOp::ExponentiationAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::GreaterThan:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::GreaterThan, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::GreaterThanEquals:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::GreaterThanEquals, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::LessThan:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::LessThan, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::LessThanEquals:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::LessThanEquals, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::EqualsEqualsEquals:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::TypedEquals, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::ExclamationMarkEqualsEquals:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::TypedInequals, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::EqualsEquals:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::AbstractEquals, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::ExclamationMarkEquals:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::AbstractInequals, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::In:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::In, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::Instanceof:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::InstanceOf, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::Ampersand:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::BitwiseAnd, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::AmpersandEquals:
|
|
return parse_assignment_expression(AssignmentOp::BitwiseAndAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Pipe:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::BitwiseOr, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::PipeEquals:
|
|
return parse_assignment_expression(AssignmentOp::BitwiseOrAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Caret:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::BitwiseXor, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::CaretEquals:
|
|
return parse_assignment_expression(AssignmentOp::BitwiseXorAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::ShiftLeft:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::LeftShift, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::ShiftLeftEquals:
|
|
return parse_assignment_expression(AssignmentOp::LeftShiftAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::ShiftRight:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::RightShift, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::ShiftRightEquals:
|
|
return parse_assignment_expression(AssignmentOp::RightShiftAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::UnsignedShiftRight:
|
|
consume();
|
|
return create_ast_node<BinaryExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, BinaryOp::UnsignedRightShift, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::UnsignedShiftRightEquals:
|
|
return parse_assignment_expression(AssignmentOp::UnsignedRightShiftAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::ParenOpen:
|
|
return parse_call_expression(move(lhs));
|
|
case TokenType::Equals:
|
|
return parse_assignment_expression(AssignmentOp::Assignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::Period:
|
|
consume();
|
|
if (!match_identifier_name())
|
|
expected("IdentifierName");
|
|
return create_ast_node<MemberExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(lhs), create_ast_node<Identifier>({ m_state.current_token.filename(), rule_start.position(), position() }, consume().value()));
|
|
case TokenType::BracketOpen: {
|
|
consume(TokenType::BracketOpen);
|
|
auto expression = create_ast_node<MemberExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(lhs), parse_expression(0), true);
|
|
consume(TokenType::BracketClose);
|
|
return expression;
|
|
}
|
|
case TokenType::PlusPlus:
|
|
// FIXME: Apparently for functions this should also not be enforced on a parser level,
|
|
// other engines throw ReferenceError for foo()++
|
|
if (!is<Identifier>(*lhs) && !is<MemberExpression>(*lhs))
|
|
syntax_error(String::formatted("Left-hand side of postfix increment operator must be identifier or member expression, got {}", lhs->class_name()));
|
|
|
|
if (m_state.strict_mode && is<Identifier>(*lhs)) {
|
|
auto& identifier = static_cast<Identifier&>(*lhs);
|
|
auto& name = identifier.string();
|
|
check_identifier_name_for_assignment_validity(name);
|
|
}
|
|
|
|
consume();
|
|
return create_ast_node<UpdateExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UpdateOp::Increment, move(lhs));
|
|
case TokenType::MinusMinus:
|
|
// FIXME: Apparently for functions this should also not be enforced on a parser level,
|
|
// other engines throw ReferenceError for foo()--
|
|
if (!is<Identifier>(*lhs) && !is<MemberExpression>(*lhs))
|
|
syntax_error(String::formatted("Left-hand side of postfix increment operator must be identifier or member expression, got {}", lhs->class_name()));
|
|
|
|
if (m_state.strict_mode && is<Identifier>(*lhs)) {
|
|
auto& identifier = static_cast<Identifier&>(*lhs);
|
|
auto& name = identifier.string();
|
|
check_identifier_name_for_assignment_validity(name);
|
|
}
|
|
consume();
|
|
return create_ast_node<UpdateExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, UpdateOp::Decrement, move(lhs));
|
|
case TokenType::DoubleAmpersand:
|
|
consume();
|
|
return create_ast_node<LogicalExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, LogicalOp::And, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::DoubleAmpersandEquals:
|
|
return parse_assignment_expression(AssignmentOp::AndAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::DoublePipe:
|
|
consume();
|
|
return create_ast_node<LogicalExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, LogicalOp::Or, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::DoublePipeEquals:
|
|
return parse_assignment_expression(AssignmentOp::OrAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::DoubleQuestionMark:
|
|
consume();
|
|
return create_ast_node<LogicalExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, LogicalOp::NullishCoalescing, move(lhs), parse_expression(min_precedence, associativity));
|
|
case TokenType::DoubleQuestionMarkEquals:
|
|
return parse_assignment_expression(AssignmentOp::NullishAssignment, move(lhs), min_precedence, associativity);
|
|
case TokenType::QuestionMark:
|
|
return parse_conditional_expression(move(lhs));
|
|
default:
|
|
expected("secondary expression");
|
|
consume();
|
|
return create_ast_node<ErrorExpression>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
}
|
|
}
|
|
|
|
NonnullRefPtr<AssignmentExpression> Parser::parse_assignment_expression(AssignmentOp assignment_op, NonnullRefPtr<Expression> lhs, int min_precedence, Associativity associativity)
|
|
{
|
|
auto rule_start = push_start();
|
|
VERIFY(match(TokenType::Equals)
|
|
|| match(TokenType::PlusEquals)
|
|
|| match(TokenType::MinusEquals)
|
|
|| match(TokenType::AsteriskEquals)
|
|
|| match(TokenType::SlashEquals)
|
|
|| match(TokenType::PercentEquals)
|
|
|| match(TokenType::DoubleAsteriskEquals)
|
|
|| match(TokenType::AmpersandEquals)
|
|
|| match(TokenType::PipeEquals)
|
|
|| match(TokenType::CaretEquals)
|
|
|| match(TokenType::ShiftLeftEquals)
|
|
|| match(TokenType::ShiftRightEquals)
|
|
|| match(TokenType::UnsignedShiftRightEquals)
|
|
|| match(TokenType::DoubleAmpersandEquals)
|
|
|| match(TokenType::DoublePipeEquals)
|
|
|| match(TokenType::DoubleQuestionMarkEquals));
|
|
consume();
|
|
|
|
if (assignment_op == AssignmentOp::Assignment) {
|
|
auto synthesize_binding_pattern = [this](Expression const& expression) -> RefPtr<BindingPattern> {
|
|
// Clear any syntax error that has occurred in the range that 'expression' spans.
|
|
m_state.errors.remove_all_matching([range = expression.source_range()](auto const& error) {
|
|
return error.position.has_value() && range.contains(*error.position);
|
|
});
|
|
// Make a parser and parse the source for this expression as a binding pattern.
|
|
auto source = m_state.lexer.source().substring_view(expression.source_range().start.offset - 2, expression.source_range().end.offset - expression.source_range().start.offset);
|
|
Lexer lexer { source, m_state.lexer.filename(), expression.source_range().start.line, expression.source_range().start.column };
|
|
Parser parser { lexer };
|
|
|
|
parser.m_state.strict_mode = m_state.strict_mode;
|
|
parser.m_state.allow_super_property_lookup = m_state.allow_super_property_lookup;
|
|
parser.m_state.allow_super_constructor_call = m_state.allow_super_constructor_call;
|
|
parser.m_state.in_function_context = m_state.in_function_context;
|
|
parser.m_state.in_formal_parameter_context = m_state.in_formal_parameter_context;
|
|
parser.m_state.in_generator_function_context = m_state.in_generator_function_context;
|
|
parser.m_state.in_arrow_function_context = m_state.in_arrow_function_context;
|
|
parser.m_state.in_break_context = m_state.in_break_context;
|
|
parser.m_state.in_continue_context = m_state.in_continue_context;
|
|
parser.m_state.string_legacy_octal_escape_sequence_in_scope = m_state.string_legacy_octal_escape_sequence_in_scope;
|
|
|
|
auto result = parser.parse_binding_pattern();
|
|
if (parser.has_errors())
|
|
m_state.errors.extend(parser.errors());
|
|
return result;
|
|
};
|
|
if (is<ArrayExpression>(*lhs) || is<ObjectExpression>(*lhs)) {
|
|
auto binding_pattern = synthesize_binding_pattern(*lhs);
|
|
if (binding_pattern) {
|
|
auto rhs = parse_expression(min_precedence, associativity);
|
|
return create_ast_node<AssignmentExpression>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
assignment_op,
|
|
binding_pattern.release_nonnull(),
|
|
move(rhs));
|
|
}
|
|
}
|
|
}
|
|
if (!is<Identifier>(*lhs) && !is<MemberExpression>(*lhs) && !is<CallExpression>(*lhs)) {
|
|
syntax_error("Invalid left-hand side in assignment");
|
|
} else if (m_state.strict_mode && is<Identifier>(*lhs)) {
|
|
auto name = static_cast<const Identifier&>(*lhs).string();
|
|
check_identifier_name_for_assignment_validity(name);
|
|
} else if (m_state.strict_mode && is<CallExpression>(*lhs)) {
|
|
syntax_error("Cannot assign to function call");
|
|
}
|
|
auto rhs = parse_expression(min_precedence, associativity);
|
|
if (assignment_op == AssignmentOp::Assignment && is<FunctionExpression>(*rhs)) {
|
|
auto ident = lhs;
|
|
if (is<MemberExpression>(*lhs)) {
|
|
ident = static_cast<MemberExpression&>(*lhs).property();
|
|
}
|
|
if (is<Identifier>(*ident))
|
|
static_cast<FunctionExpression&>(*rhs).set_name_if_possible(static_cast<Identifier&>(*ident).string());
|
|
}
|
|
return create_ast_node<AssignmentExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, assignment_op, move(lhs), move(rhs));
|
|
}
|
|
|
|
NonnullRefPtr<Identifier> Parser::parse_identifier()
|
|
{
|
|
auto identifier_start = position();
|
|
auto token = consume_identifier();
|
|
return create_ast_node<Identifier>(
|
|
{ m_state.current_token.filename(), identifier_start, position() },
|
|
token.value());
|
|
}
|
|
|
|
NonnullRefPtr<CallExpression> Parser::parse_call_expression(NonnullRefPtr<Expression> lhs)
|
|
{
|
|
auto rule_start = push_start();
|
|
if (!m_state.allow_super_constructor_call && is<SuperExpression>(*lhs))
|
|
syntax_error("'super' keyword unexpected here");
|
|
|
|
consume(TokenType::ParenOpen);
|
|
|
|
Vector<CallExpression::Argument> arguments;
|
|
|
|
while (match_expression() || match(TokenType::TripleDot)) {
|
|
if (match(TokenType::TripleDot)) {
|
|
consume();
|
|
arguments.append({ parse_expression(2), true });
|
|
} else {
|
|
arguments.append({ parse_expression(2), false });
|
|
}
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
consume();
|
|
}
|
|
|
|
consume(TokenType::ParenClose);
|
|
|
|
if (is<SuperExpression>(*lhs))
|
|
return create_ast_node<SuperCall>({ m_state.current_token.filename(), rule_start.position(), position() }, move(arguments));
|
|
|
|
return create_ast_node<CallExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(lhs), move(arguments));
|
|
}
|
|
|
|
NonnullRefPtr<NewExpression> Parser::parse_new_expression()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::New);
|
|
|
|
auto callee = parse_expression(g_operator_precedence.get(TokenType::New), Associativity::Right, { TokenType::ParenOpen });
|
|
|
|
Vector<CallExpression::Argument> arguments;
|
|
|
|
if (match(TokenType::ParenOpen)) {
|
|
consume(TokenType::ParenOpen);
|
|
while (match_expression() || match(TokenType::TripleDot)) {
|
|
if (match(TokenType::TripleDot)) {
|
|
consume();
|
|
arguments.append({ parse_expression(2), true });
|
|
} else {
|
|
arguments.append({ parse_expression(2), false });
|
|
}
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
consume();
|
|
}
|
|
consume(TokenType::ParenClose);
|
|
}
|
|
|
|
return create_ast_node<NewExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(callee), move(arguments));
|
|
}
|
|
|
|
NonnullRefPtr<YieldExpression> Parser::parse_yield_expression()
|
|
{
|
|
auto rule_start = push_start();
|
|
|
|
if (m_state.in_formal_parameter_context)
|
|
syntax_error("'Yield' expression is not allowed in formal parameters of generator function");
|
|
|
|
consume(TokenType::Yield);
|
|
RefPtr<Expression> argument;
|
|
bool yield_from = false;
|
|
|
|
if (!m_state.current_token.trivia_contains_line_terminator()) {
|
|
if (match(TokenType::Asterisk)) {
|
|
consume();
|
|
yield_from = true;
|
|
}
|
|
|
|
if (yield_from || match_expression() || match(TokenType::Class))
|
|
argument = parse_expression(0);
|
|
}
|
|
|
|
return create_ast_node<YieldExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(argument), yield_from);
|
|
}
|
|
|
|
NonnullRefPtr<ReturnStatement> Parser::parse_return_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
if (!m_state.in_function_context && !m_state.in_arrow_function_context)
|
|
syntax_error("'return' not allowed outside of a function");
|
|
|
|
consume(TokenType::Return);
|
|
|
|
// Automatic semicolon insertion: terminate statement when return is followed by newline
|
|
if (m_state.current_token.trivia_contains_line_terminator())
|
|
return create_ast_node<ReturnStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, nullptr);
|
|
|
|
if (match_expression()) {
|
|
auto expression = parse_expression(0);
|
|
consume_or_insert_semicolon();
|
|
return create_ast_node<ReturnStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expression));
|
|
}
|
|
|
|
consume_or_insert_semicolon();
|
|
return create_ast_node<ReturnStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, nullptr);
|
|
}
|
|
|
|
NonnullRefPtr<BlockStatement> Parser::parse_block_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
bool dummy = false;
|
|
return parse_block_statement(dummy);
|
|
}
|
|
|
|
NonnullRefPtr<BlockStatement> Parser::parse_block_statement(bool& is_strict, bool error_on_binding)
|
|
{
|
|
auto rule_start = push_start();
|
|
ScopePusher scope(*this, ScopePusher::Let, Parser::Scope::Block);
|
|
auto block = create_ast_node<BlockStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
consume(TokenType::CurlyOpen);
|
|
|
|
bool initial_strict_mode_state = m_state.strict_mode;
|
|
if (initial_strict_mode_state)
|
|
is_strict = true;
|
|
|
|
bool parsing_directives = true;
|
|
while (!done() && !match(TokenType::CurlyClose)) {
|
|
if (match_declaration()) {
|
|
block->append(parse_declaration());
|
|
parsing_directives = false;
|
|
} else if (match_statement()) {
|
|
auto statement = parse_statement(AllowLabelledFunction::Yes);
|
|
block->append(statement);
|
|
if (statement_is_use_strict_directive(statement)) {
|
|
if (parsing_directives) {
|
|
if (!initial_strict_mode_state) {
|
|
is_strict = true;
|
|
m_state.strict_mode = true;
|
|
}
|
|
}
|
|
if (m_state.string_legacy_octal_escape_sequence_in_scope)
|
|
syntax_error("Octal escape sequence in string literal not allowed in strict mode");
|
|
|
|
if (error_on_binding) {
|
|
syntax_error("Illegal 'use strict' directive in function with non-simple parameter list");
|
|
}
|
|
}
|
|
|
|
if (parsing_directives && is<ExpressionStatement>(*statement)) {
|
|
auto& expression_statement = static_cast<ExpressionStatement&>(*statement);
|
|
auto& expression = expression_statement.expression();
|
|
parsing_directives = is<StringLiteral>(expression);
|
|
} else {
|
|
parsing_directives = false;
|
|
}
|
|
} else {
|
|
expected("statement or declaration");
|
|
consume();
|
|
parsing_directives = false;
|
|
}
|
|
}
|
|
m_state.strict_mode = initial_strict_mode_state;
|
|
m_state.string_legacy_octal_escape_sequence_in_scope = false;
|
|
consume(TokenType::CurlyClose);
|
|
scope.add_to_scope_node(block);
|
|
return block;
|
|
}
|
|
|
|
template<typename FunctionNodeType>
|
|
NonnullRefPtr<FunctionNodeType> Parser::parse_function_node(u8 parse_options)
|
|
{
|
|
auto rule_start = push_start();
|
|
VERIFY(!(parse_options & FunctionNodeParseOptions::IsGetterFunction && parse_options & FunctionNodeParseOptions::IsSetterFunction));
|
|
|
|
TemporaryChange super_property_access_rollback(m_state.allow_super_property_lookup, !!(parse_options & FunctionNodeParseOptions::AllowSuperPropertyLookup));
|
|
TemporaryChange super_constructor_call_rollback(m_state.allow_super_constructor_call, !!(parse_options & FunctionNodeParseOptions::AllowSuperConstructorCall));
|
|
TemporaryChange break_context_rollback(m_state.in_break_context, false);
|
|
TemporaryChange continue_context_rollback(m_state.in_continue_context, false);
|
|
|
|
ScopePusher scope(*this, ScopePusher::Var, Parser::Scope::Function);
|
|
|
|
constexpr auto is_function_expression = IsSame<FunctionNodeType, FunctionExpression>;
|
|
auto is_generator = (parse_options & FunctionNodeParseOptions::IsGeneratorFunction) != 0;
|
|
String name;
|
|
if (parse_options & FunctionNodeParseOptions::CheckForFunctionAndName) {
|
|
consume(TokenType::Function);
|
|
if (!is_generator) {
|
|
is_generator = match(TokenType::Asterisk);
|
|
if (is_generator) {
|
|
consume(TokenType::Asterisk);
|
|
parse_options = parse_options | FunctionNodeParseOptions::IsGeneratorFunction;
|
|
}
|
|
}
|
|
|
|
if (FunctionNodeType::must_have_name() || match_identifier())
|
|
name = consume_identifier().value();
|
|
else if (is_function_expression && (match(TokenType::Yield) || match(TokenType::Await)))
|
|
name = consume().value();
|
|
|
|
check_identifier_name_for_assignment_validity(name);
|
|
}
|
|
TemporaryChange generator_change(m_state.in_generator_function_context, is_generator);
|
|
|
|
consume(TokenType::ParenOpen);
|
|
i32 function_length = -1;
|
|
auto parameters = parse_formal_parameters(function_length, parse_options);
|
|
consume(TokenType::ParenClose);
|
|
|
|
if (function_length == -1)
|
|
function_length = parameters.size();
|
|
|
|
TemporaryChange change(m_state.in_function_context, true);
|
|
|
|
auto old_labels_in_scope = move(m_state.labels_in_scope);
|
|
ScopeGuard guard([&]() {
|
|
m_state.labels_in_scope = move(old_labels_in_scope);
|
|
});
|
|
|
|
m_state.function_parameters.append(parameters);
|
|
|
|
bool has_binding = any_of(parameters, [](FunctionNode::Parameter const& parameter) {
|
|
return parameter.binding.has<NonnullRefPtr<BindingPattern>>();
|
|
});
|
|
|
|
bool is_strict = false;
|
|
auto body = parse_block_statement(is_strict, has_binding);
|
|
|
|
// If the function contains 'use strict' we need to check the parameters (again).
|
|
if (is_strict || is_generator) {
|
|
Vector<StringView> parameter_names;
|
|
for (auto& parameter : parameters) {
|
|
parameter.binding.visit(
|
|
[&](FlyString const& parameter_name) {
|
|
check_identifier_name_for_assignment_validity(parameter_name, is_strict);
|
|
if (is_generator && parameter_name == "yield"sv)
|
|
syntax_error("Parameter name 'yield' not allowed in this context");
|
|
|
|
for (auto& previous_name : parameter_names) {
|
|
if (previous_name == parameter_name) {
|
|
syntax_error(String::formatted("Duplicate parameter '{}' not allowed in strict mode", parameter_name));
|
|
}
|
|
}
|
|
|
|
parameter_names.append(parameter_name);
|
|
},
|
|
[&](NonnullRefPtr<BindingPattern> const& binding) {
|
|
binding->for_each_bound_name([&](auto& bound_name) {
|
|
if (is_generator && bound_name == "yield"sv)
|
|
syntax_error("Parameter name 'yield' not allowed in this context");
|
|
|
|
for (auto& previous_name : parameter_names) {
|
|
if (previous_name == bound_name) {
|
|
syntax_error(String::formatted("Duplicate parameter '{}' not allowed in strict mode", bound_name));
|
|
break;
|
|
}
|
|
}
|
|
parameter_names.append(bound_name);
|
|
});
|
|
});
|
|
}
|
|
check_identifier_name_for_assignment_validity(name, is_strict);
|
|
}
|
|
|
|
m_state.function_parameters.take_last();
|
|
|
|
scope.add_to_scope_node(body);
|
|
|
|
return create_ast_node<FunctionNodeType>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
name, move(body), move(parameters), function_length,
|
|
is_generator ? FunctionKind::Generator : FunctionKind::Regular, is_strict);
|
|
}
|
|
|
|
Vector<FunctionNode::Parameter> Parser::parse_formal_parameters(int& function_length, u8 parse_options)
|
|
{
|
|
auto rule_start = push_start();
|
|
bool has_default_parameter = false;
|
|
bool has_rest_parameter = false;
|
|
TemporaryChange formal_parameter_context_change { m_state.in_formal_parameter_context, true };
|
|
|
|
Vector<FunctionNode::Parameter> parameters;
|
|
|
|
auto consume_identifier_or_binding_pattern = [&]() -> Variant<FlyString, NonnullRefPtr<BindingPattern>> {
|
|
if (auto pattern = parse_binding_pattern(true))
|
|
return pattern.release_nonnull();
|
|
|
|
auto token = consume_identifier();
|
|
auto parameter_name = token.value();
|
|
|
|
check_identifier_name_for_assignment_validity(parameter_name);
|
|
|
|
for (auto& parameter : parameters) {
|
|
bool has_same_name = parameter.binding.visit(
|
|
[&](FlyString const& name) {
|
|
return name == parameter_name;
|
|
},
|
|
[&](NonnullRefPtr<BindingPattern> const& bindings) {
|
|
bool found_duplicate = false;
|
|
bindings->for_each_bound_name([&](auto& bound_name) {
|
|
if (bound_name == parameter_name)
|
|
found_duplicate = true;
|
|
});
|
|
return found_duplicate;
|
|
});
|
|
|
|
if (!has_same_name)
|
|
continue;
|
|
|
|
String message;
|
|
if (parse_options & FunctionNodeParseOptions::IsArrowFunction)
|
|
message = String::formatted("Duplicate parameter '{}' not allowed in arrow function", parameter_name);
|
|
else if (m_state.strict_mode)
|
|
message = String::formatted("Duplicate parameter '{}' not allowed in strict mode", parameter_name);
|
|
else if (has_default_parameter || match(TokenType::Equals))
|
|
message = String::formatted("Duplicate parameter '{}' not allowed in function with default parameter", parameter_name);
|
|
else if (has_rest_parameter)
|
|
message = String::formatted("Duplicate parameter '{}' not allowed in function with rest parameter", parameter_name);
|
|
if (!message.is_empty())
|
|
syntax_error(message, Position { token.line_number(), token.line_column() });
|
|
break;
|
|
}
|
|
return FlyString { token.value() };
|
|
};
|
|
|
|
while (match(TokenType::CurlyOpen) || match(TokenType::BracketOpen) || match_identifier() || match(TokenType::TripleDot)) {
|
|
if (parse_options & FunctionNodeParseOptions::IsGetterFunction)
|
|
syntax_error("Getter function must have no arguments");
|
|
if (parse_options & FunctionNodeParseOptions::IsSetterFunction && (parameters.size() >= 1 || match(TokenType::TripleDot)))
|
|
syntax_error("Setter function must have one argument");
|
|
auto is_rest = false;
|
|
if (match(TokenType::TripleDot)) {
|
|
consume();
|
|
has_rest_parameter = true;
|
|
function_length = parameters.size();
|
|
is_rest = true;
|
|
}
|
|
auto parameter = consume_identifier_or_binding_pattern();
|
|
RefPtr<Expression> default_value;
|
|
if (match(TokenType::Equals)) {
|
|
consume();
|
|
|
|
if (is_rest)
|
|
syntax_error("Rest parameter may not have a default initializer");
|
|
|
|
TemporaryChange change(m_state.in_function_context, true);
|
|
has_default_parameter = true;
|
|
function_length = parameters.size();
|
|
default_value = parse_expression(2);
|
|
|
|
bool is_generator = parse_options & FunctionNodeParseOptions::IsGeneratorFunction;
|
|
if ((is_generator || m_state.strict_mode) && default_value && default_value->fast_is<Identifier>() && static_cast<Identifier&>(*default_value).string() == "yield"sv)
|
|
syntax_error("Generator function parameter initializer cannot contain a reference to an identifier named \"yield\"");
|
|
}
|
|
parameters.append({ move(parameter), default_value, is_rest });
|
|
if (match(TokenType::ParenClose))
|
|
break;
|
|
consume(TokenType::Comma);
|
|
if (is_rest)
|
|
break;
|
|
}
|
|
if (parse_options & FunctionNodeParseOptions::IsSetterFunction && parameters.is_empty())
|
|
syntax_error("Setter function must have one argument");
|
|
return parameters;
|
|
}
|
|
|
|
static constexpr AK::Array<StringView, 36> s_reserved_words = { "break", "case", "catch", "class", "const", "continue", "debugger", "default", "delete", "do", "else", "enum", "export", "extends", "false", "finally", "for", "function", "if", "import", "in", "instanceof", "new", "null", "return", "super", "switch", "this", "throw", "true", "try", "typeof", "var", "void", "while", "with" };
|
|
|
|
RefPtr<BindingPattern> Parser::parse_binding_pattern(bool strict_checks)
|
|
{
|
|
auto rule_start = push_start();
|
|
|
|
TokenType closing_token;
|
|
bool is_object = true;
|
|
|
|
if (match(TokenType::BracketOpen)) {
|
|
consume();
|
|
closing_token = TokenType::BracketClose;
|
|
is_object = false;
|
|
} else if (match(TokenType::CurlyOpen)) {
|
|
consume();
|
|
closing_token = TokenType::CurlyClose;
|
|
} else {
|
|
return {};
|
|
}
|
|
|
|
Vector<BindingPattern::BindingEntry> entries;
|
|
|
|
while (!match(closing_token)) {
|
|
if (!is_object && match(TokenType::Comma)) {
|
|
consume();
|
|
entries.append(BindingPattern::BindingEntry {});
|
|
continue;
|
|
}
|
|
|
|
auto is_rest = false;
|
|
|
|
if (match(TokenType::TripleDot)) {
|
|
consume();
|
|
is_rest = true;
|
|
}
|
|
|
|
decltype(BindingPattern::BindingEntry::name) name = Empty {};
|
|
decltype(BindingPattern::BindingEntry::alias) alias = Empty {};
|
|
RefPtr<Expression> initializer = {};
|
|
|
|
if (is_object) {
|
|
if (match_identifier_name()) {
|
|
name = create_ast_node<Identifier>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
consume().value());
|
|
} else if (match(TokenType::BracketOpen)) {
|
|
consume();
|
|
auto expression = parse_expression(0);
|
|
|
|
if (strict_checks && m_state.in_generator_function_context && is<YieldExpression>(*expression))
|
|
syntax_error("Yield expression not allowed in formal parameter within generator context");
|
|
|
|
name = move(expression);
|
|
consume(TokenType::BracketClose);
|
|
} else {
|
|
expected("identifier or computed property name");
|
|
return {};
|
|
}
|
|
|
|
if (!is_rest && match(TokenType::Colon)) {
|
|
consume();
|
|
if (match(TokenType::CurlyOpen) || match(TokenType::BracketOpen)) {
|
|
auto binding_pattern = parse_binding_pattern(strict_checks);
|
|
if (!binding_pattern)
|
|
return {};
|
|
alias = binding_pattern.release_nonnull();
|
|
} else if (match_identifier_name()) {
|
|
alias = create_ast_node<Identifier>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
consume_identifier().value());
|
|
if (strict_checks && match(TokenType::BracketOpen))
|
|
syntax_error("Illegal property in declaration context");
|
|
} else {
|
|
expected("identifier or binding pattern");
|
|
return {};
|
|
}
|
|
}
|
|
} else {
|
|
if (match_identifier_name()) {
|
|
// BindingElement must always have an Empty name field
|
|
auto identifier_name = consume_identifier().value();
|
|
alias = create_ast_node<Identifier>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
identifier_name);
|
|
|
|
if (strict_checks) {
|
|
for (auto& entry : entries) {
|
|
if (entry.alias.has<NonnullRefPtr<Identifier>>()) {
|
|
if (entry.alias.get<NonnullRefPtr<Identifier>>()->string() == identifier_name)
|
|
syntax_error("Duplicate parameter names in bindings");
|
|
}
|
|
}
|
|
}
|
|
} else if (match(TokenType::BracketOpen) || match(TokenType::CurlyOpen)) {
|
|
auto pattern = parse_binding_pattern(strict_checks);
|
|
if (!pattern) {
|
|
expected("binding pattern");
|
|
return {};
|
|
}
|
|
alias = pattern.release_nonnull();
|
|
} else {
|
|
expected("identifier or binding pattern");
|
|
return {};
|
|
}
|
|
}
|
|
|
|
if (match(TokenType::Equals)) {
|
|
if (is_rest) {
|
|
syntax_error("Unexpected initializer after rest element");
|
|
return {};
|
|
}
|
|
|
|
consume();
|
|
|
|
initializer = parse_expression(2);
|
|
if (!initializer) {
|
|
expected("initialization expression");
|
|
return {};
|
|
}
|
|
if (strict_checks && is<YieldExpression>(*initializer))
|
|
syntax_error("Yield expression is not allow in formal parameter");
|
|
}
|
|
|
|
entries.append(BindingPattern::BindingEntry { move(name), move(alias), move(initializer), is_rest });
|
|
|
|
if (match(TokenType::Comma)) {
|
|
if (is_rest) {
|
|
syntax_error("Rest element may not be followed by a comma");
|
|
return {};
|
|
}
|
|
consume();
|
|
}
|
|
}
|
|
|
|
while (!is_object && match(TokenType::Comma))
|
|
consume();
|
|
|
|
consume(closing_token);
|
|
|
|
auto kind = is_object ? BindingPattern::Kind::Object : BindingPattern::Kind::Array;
|
|
auto pattern = adopt_ref(*new BindingPattern);
|
|
pattern->entries = move(entries);
|
|
pattern->kind = kind;
|
|
|
|
Vector<StringView> bound_names;
|
|
pattern->for_each_bound_name([&](auto& name) {
|
|
if (strict_checks) {
|
|
if (bound_names.contains_slow(name))
|
|
syntax_error("Duplicate parameter names in bindings");
|
|
bound_names.append(name);
|
|
}
|
|
check_identifier_name_for_assignment_validity(name);
|
|
});
|
|
|
|
return pattern;
|
|
}
|
|
|
|
NonnullRefPtr<VariableDeclaration> Parser::parse_variable_declaration(bool for_loop_variable_declaration)
|
|
{
|
|
auto rule_start = push_start();
|
|
DeclarationKind declaration_kind;
|
|
|
|
switch (m_state.current_token.type()) {
|
|
case TokenType::Var:
|
|
declaration_kind = DeclarationKind::Var;
|
|
break;
|
|
case TokenType::Let:
|
|
declaration_kind = DeclarationKind::Let;
|
|
break;
|
|
case TokenType::Const:
|
|
declaration_kind = DeclarationKind::Const;
|
|
break;
|
|
default:
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
consume();
|
|
|
|
NonnullRefPtrVector<VariableDeclarator> declarations;
|
|
for (;;) {
|
|
Variant<NonnullRefPtr<Identifier>, NonnullRefPtr<BindingPattern>, Empty> target { Empty() };
|
|
if (match_identifier()) {
|
|
auto identifier_start = push_start();
|
|
auto name = consume_identifier().value();
|
|
target = create_ast_node<Identifier>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
name);
|
|
check_identifier_name_for_assignment_validity(name);
|
|
if ((declaration_kind == DeclarationKind::Let || declaration_kind == DeclarationKind::Const) && name == "let"sv)
|
|
syntax_error("Lexical binding may not be called 'let'");
|
|
|
|
// Check we do not have duplicates
|
|
auto check_declarations = [&](VariableDeclarator const& declarator) {
|
|
declarator.target().visit([&](NonnullRefPtr<Identifier> const& identifier) {
|
|
if (identifier->string() == name)
|
|
syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position()); },
|
|
[&](auto const&) {});
|
|
};
|
|
|
|
// In any previous let scope
|
|
if (!m_state.let_scopes.is_empty()) {
|
|
for (auto& decls : m_state.let_scopes.last()) {
|
|
for (auto& decl : decls.declarations()) {
|
|
check_declarations(decl);
|
|
}
|
|
}
|
|
}
|
|
|
|
// or this declaration
|
|
if (declaration_kind == DeclarationKind::Let || declaration_kind == DeclarationKind::Const) {
|
|
// FIXME: We should check the var_scopes here as well however this has edges cases with for loops.
|
|
// See duplicated-variable-declarations.js.
|
|
|
|
if (!m_state.function_parameters.is_empty() && m_state.current_scope->parent->type == Scope::Function) {
|
|
for (auto& parameter : m_state.function_parameters.last()) {
|
|
parameter.binding.visit(
|
|
[&](FlyString const& parameter_name) {
|
|
if (parameter_name == name)
|
|
syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position());
|
|
},
|
|
[&](NonnullRefPtr<BindingPattern> const& binding) {
|
|
binding->for_each_bound_name([&](auto& bound_name) {
|
|
if (bound_name == name)
|
|
syntax_error(String::formatted("Identifier '{}' has already been declared", name), identifier_start.position());
|
|
});
|
|
});
|
|
}
|
|
}
|
|
|
|
for (auto& declaration : declarations) {
|
|
check_declarations(declaration);
|
|
}
|
|
}
|
|
} else if (auto pattern = parse_binding_pattern(declaration_kind != DeclarationKind::Var)) {
|
|
target = pattern.release_nonnull();
|
|
|
|
if ((declaration_kind == DeclarationKind::Let || declaration_kind == DeclarationKind::Const)) {
|
|
target.get<NonnullRefPtr<BindingPattern>>()->for_each_bound_name([this, &declarations](auto& name) {
|
|
if (name == "let"sv)
|
|
syntax_error("Lexical binding may not be called 'let'");
|
|
|
|
// FIXME: Again we do not check everything here see for example the parameter check above.
|
|
// However a more sustainable solution should be used since these checks are now spread over multiple sites.
|
|
|
|
for (auto& declaration : declarations) {
|
|
declaration.target().visit(
|
|
[&](NonnullRefPtr<Identifier> const& identifier) {
|
|
if (identifier->string() == name)
|
|
syntax_error(String::formatted("Identifier '{}' has already been declared", name));
|
|
},
|
|
[&](auto const&) {});
|
|
}
|
|
});
|
|
}
|
|
} else if (!m_state.in_generator_function_context && match(TokenType::Yield)) {
|
|
if (m_state.strict_mode)
|
|
syntax_error("Identifier must not be a reserved word in strict mode ('yield')");
|
|
|
|
target = create_ast_node<Identifier>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
consume().value());
|
|
}
|
|
|
|
if (target.has<Empty>()) {
|
|
expected("identifier or a binding pattern");
|
|
if (match(TokenType::Comma)) {
|
|
consume();
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
RefPtr<Expression> init;
|
|
if (match(TokenType::Equals)) {
|
|
consume();
|
|
init = parse_expression(2);
|
|
} else if (!for_loop_variable_declaration && declaration_kind == DeclarationKind::Const) {
|
|
syntax_error("Missing initializer in 'const' variable declaration");
|
|
} else if (!for_loop_variable_declaration && target.has<NonnullRefPtr<BindingPattern>>()) {
|
|
syntax_error("Missing initializer in destructuring assignment");
|
|
}
|
|
|
|
if (init && is<FunctionExpression>(*init) && target.has<NonnullRefPtr<Identifier>>()) {
|
|
static_cast<FunctionExpression&>(*init).set_name_if_possible(target.get<NonnullRefPtr<Identifier>>()->string());
|
|
}
|
|
|
|
declarations.append(create_ast_node<VariableDeclarator>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
move(target).downcast<NonnullRefPtr<Identifier>, NonnullRefPtr<BindingPattern>>(),
|
|
move(init)));
|
|
|
|
if (match(TokenType::Comma)) {
|
|
consume();
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (!for_loop_variable_declaration)
|
|
consume_or_insert_semicolon();
|
|
|
|
auto declaration = create_ast_node<VariableDeclaration>({ m_state.current_token.filename(), rule_start.position(), position() }, declaration_kind, move(declarations));
|
|
if (declaration_kind == DeclarationKind::Var) {
|
|
m_state.var_scopes.last().append(declaration);
|
|
} else {
|
|
m_state.let_scopes.last().append(declaration);
|
|
|
|
for (auto& declarator : declaration->declarations()) {
|
|
declarator.target().visit(
|
|
[&](const NonnullRefPtr<Identifier>& id) {
|
|
m_state.current_scope->lexical_declarations.set(id->string());
|
|
},
|
|
[&](const NonnullRefPtr<BindingPattern>& binding) {
|
|
binding->for_each_bound_name([&](const auto& name) {
|
|
m_state.current_scope->lexical_declarations.set(name);
|
|
});
|
|
});
|
|
}
|
|
}
|
|
return declaration;
|
|
}
|
|
|
|
NonnullRefPtr<ThrowStatement> Parser::parse_throw_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Throw);
|
|
|
|
// Automatic semicolon insertion: terminate statement when throw is followed by newline
|
|
if (m_state.current_token.trivia_contains_line_terminator()) {
|
|
syntax_error("No line break is allowed between 'throw' and its expression");
|
|
return create_ast_node<ThrowStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, create_ast_node<ErrorExpression>({ m_state.current_token.filename(), rule_start.position(), position() }));
|
|
}
|
|
|
|
auto expression = parse_expression(0);
|
|
consume_or_insert_semicolon();
|
|
return create_ast_node<ThrowStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expression));
|
|
}
|
|
|
|
NonnullRefPtr<BreakStatement> Parser::parse_break_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Break);
|
|
FlyString target_label;
|
|
if (match(TokenType::Semicolon)) {
|
|
consume();
|
|
} else {
|
|
if (match(TokenType::Identifier) && !m_state.current_token.trivia_contains_line_terminator()) {
|
|
target_label = consume().value();
|
|
if (!m_state.labels_in_scope.contains(target_label))
|
|
syntax_error(String::formatted("Label '{}' not found", target_label));
|
|
}
|
|
consume_or_insert_semicolon();
|
|
}
|
|
|
|
if (target_label.is_null() && !m_state.in_break_context)
|
|
syntax_error("Unlabeled 'break' not allowed outside of a loop or switch statement");
|
|
|
|
return create_ast_node<BreakStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, target_label);
|
|
}
|
|
|
|
NonnullRefPtr<ContinueStatement> Parser::parse_continue_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
if (!m_state.in_continue_context)
|
|
syntax_error("'continue' not allow outside of a loop");
|
|
|
|
consume(TokenType::Continue);
|
|
FlyString target_label;
|
|
if (match(TokenType::Semicolon)) {
|
|
consume();
|
|
return create_ast_node<ContinueStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, target_label);
|
|
}
|
|
if (match(TokenType::Identifier) && !m_state.current_token.trivia_contains_line_terminator()) {
|
|
target_label = consume().value();
|
|
if (!m_state.labels_in_scope.contains(target_label))
|
|
syntax_error(String::formatted("Label '{}' not found", target_label));
|
|
}
|
|
consume_or_insert_semicolon();
|
|
return create_ast_node<ContinueStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, target_label);
|
|
}
|
|
|
|
NonnullRefPtr<ConditionalExpression> Parser::parse_conditional_expression(NonnullRefPtr<Expression> test)
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::QuestionMark);
|
|
auto consequent = parse_expression(2);
|
|
consume(TokenType::Colon);
|
|
auto alternate = parse_expression(2);
|
|
return create_ast_node<ConditionalExpression>({ m_state.current_token.filename(), rule_start.position(), position() }, move(test), move(consequent), move(alternate));
|
|
}
|
|
|
|
NonnullRefPtr<TryStatement> Parser::parse_try_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Try);
|
|
|
|
auto block = parse_block_statement();
|
|
|
|
RefPtr<CatchClause> handler;
|
|
if (match(TokenType::Catch))
|
|
handler = parse_catch_clause();
|
|
|
|
RefPtr<BlockStatement> finalizer;
|
|
if (match(TokenType::Finally)) {
|
|
consume();
|
|
finalizer = parse_block_statement();
|
|
}
|
|
|
|
if (!handler && !finalizer)
|
|
syntax_error("try statement must have a 'catch' or 'finally' clause");
|
|
|
|
return create_ast_node<TryStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(block), move(handler), move(finalizer));
|
|
}
|
|
|
|
NonnullRefPtr<DoWhileStatement> Parser::parse_do_while_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Do);
|
|
|
|
auto body = [&]() -> NonnullRefPtr<Statement> {
|
|
TemporaryChange break_change(m_state.in_break_context, true);
|
|
TemporaryChange continue_change(m_state.in_continue_context, true);
|
|
return parse_statement();
|
|
}();
|
|
|
|
consume(TokenType::While);
|
|
consume(TokenType::ParenOpen);
|
|
|
|
auto test = parse_expression(0);
|
|
|
|
consume(TokenType::ParenClose);
|
|
|
|
// Since ES 2015 a missing semicolon is inserted here, despite the regular ASI rules not applying
|
|
if (match(TokenType::Semicolon))
|
|
consume();
|
|
|
|
return create_ast_node<DoWhileStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(test), move(body));
|
|
}
|
|
|
|
NonnullRefPtr<WhileStatement> Parser::parse_while_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::While);
|
|
consume(TokenType::ParenOpen);
|
|
|
|
auto test = parse_expression(0);
|
|
|
|
consume(TokenType::ParenClose);
|
|
|
|
TemporaryChange break_change(m_state.in_break_context, true);
|
|
TemporaryChange continue_change(m_state.in_continue_context, true);
|
|
auto body = parse_statement();
|
|
|
|
return create_ast_node<WhileStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(test), move(body));
|
|
}
|
|
|
|
NonnullRefPtr<SwitchStatement> Parser::parse_switch_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Switch);
|
|
|
|
consume(TokenType::ParenOpen);
|
|
auto determinant = parse_expression(0);
|
|
consume(TokenType::ParenClose);
|
|
|
|
consume(TokenType::CurlyOpen);
|
|
|
|
NonnullRefPtrVector<SwitchCase> cases;
|
|
|
|
auto has_default = false;
|
|
while (match(TokenType::Case) || match(TokenType::Default)) {
|
|
if (match(TokenType::Default)) {
|
|
if (has_default)
|
|
syntax_error("Multiple 'default' clauses in switch statement");
|
|
has_default = true;
|
|
}
|
|
cases.append(parse_switch_case());
|
|
}
|
|
|
|
consume(TokenType::CurlyClose);
|
|
|
|
return create_ast_node<SwitchStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(determinant), move(cases));
|
|
}
|
|
|
|
NonnullRefPtr<WithStatement> Parser::parse_with_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::With);
|
|
consume(TokenType::ParenOpen);
|
|
|
|
auto object = parse_expression(0);
|
|
|
|
consume(TokenType::ParenClose);
|
|
|
|
auto body = parse_statement();
|
|
return create_ast_node<WithStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(object), move(body));
|
|
}
|
|
|
|
NonnullRefPtr<SwitchCase> Parser::parse_switch_case()
|
|
{
|
|
auto rule_start = push_start();
|
|
RefPtr<Expression> test;
|
|
|
|
if (consume().type() == TokenType::Case) {
|
|
test = parse_expression(0);
|
|
}
|
|
|
|
consume(TokenType::Colon);
|
|
|
|
NonnullRefPtrVector<Statement> consequent;
|
|
TemporaryChange break_change(m_state.in_break_context, true);
|
|
for (;;) {
|
|
if (match_declaration())
|
|
consequent.append(parse_declaration());
|
|
else if (match_statement())
|
|
consequent.append(parse_statement());
|
|
else
|
|
break;
|
|
}
|
|
|
|
return create_ast_node<SwitchCase>({ m_state.current_token.filename(), rule_start.position(), position() }, move(test), move(consequent));
|
|
}
|
|
|
|
NonnullRefPtr<CatchClause> Parser::parse_catch_clause()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Catch);
|
|
|
|
FlyString parameter;
|
|
RefPtr<BindingPattern> pattern_parameter;
|
|
auto should_expect_parameter = false;
|
|
if (match(TokenType::ParenOpen)) {
|
|
should_expect_parameter = true;
|
|
consume();
|
|
if (match_identifier_name() && (!match(TokenType::Yield) || !m_state.in_generator_function_context))
|
|
parameter = consume().value();
|
|
else
|
|
pattern_parameter = parse_binding_pattern(true);
|
|
consume(TokenType::ParenClose);
|
|
}
|
|
|
|
if (should_expect_parameter && parameter.is_empty() && !pattern_parameter)
|
|
expected("an identifier or a binding pattern");
|
|
|
|
if (pattern_parameter)
|
|
pattern_parameter->for_each_bound_name([this](auto& name) { check_identifier_name_for_assignment_validity(name); });
|
|
|
|
if (!parameter.is_empty())
|
|
check_identifier_name_for_assignment_validity(parameter);
|
|
|
|
auto body = parse_block_statement();
|
|
if (pattern_parameter) {
|
|
return create_ast_node<CatchClause>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
pattern_parameter.release_nonnull(),
|
|
move(body));
|
|
}
|
|
|
|
return create_ast_node<CatchClause>(
|
|
{ m_state.current_token.filename(), rule_start.position(), position() },
|
|
move(parameter),
|
|
move(body));
|
|
}
|
|
|
|
NonnullRefPtr<IfStatement> Parser::parse_if_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
auto parse_function_declaration_as_block_statement = [&] {
|
|
// https://tc39.es/ecma262/#sec-functiondeclarations-in-ifstatement-statement-clauses
|
|
// Code matching this production is processed as if each matching occurrence of
|
|
// FunctionDeclaration[?Yield, ?Await, ~Default] was the sole StatementListItem
|
|
// of a BlockStatement occupying that position in the source code.
|
|
ScopePusher scope(*this, ScopePusher::Let, Parser::Scope::Block);
|
|
auto block = create_ast_node<BlockStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
block->append(parse_declaration());
|
|
scope.add_to_scope_node(block);
|
|
return block;
|
|
};
|
|
|
|
consume(TokenType::If);
|
|
consume(TokenType::ParenOpen);
|
|
auto predicate = parse_expression(0);
|
|
consume(TokenType::ParenClose);
|
|
|
|
RefPtr<Statement> consequent;
|
|
if (!m_state.strict_mode && match(TokenType::Function))
|
|
consequent = parse_function_declaration_as_block_statement();
|
|
else
|
|
consequent = parse_statement();
|
|
|
|
RefPtr<Statement> alternate;
|
|
if (match(TokenType::Else)) {
|
|
consume();
|
|
if (!m_state.strict_mode && match(TokenType::Function))
|
|
alternate = parse_function_declaration_as_block_statement();
|
|
else
|
|
alternate = parse_statement();
|
|
}
|
|
return create_ast_node<IfStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(predicate), move(*consequent), move(alternate));
|
|
}
|
|
|
|
NonnullRefPtr<Statement> Parser::parse_for_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
auto match_for_in_of = [&]() {
|
|
return match(TokenType::In) || (match(TokenType::Identifier) && m_state.current_token.original_value() == "of");
|
|
};
|
|
|
|
consume(TokenType::For);
|
|
|
|
consume(TokenType::ParenOpen);
|
|
|
|
bool in_scope = false;
|
|
ScopeGuard guard([&]() {
|
|
if (in_scope)
|
|
m_state.let_scopes.take_last();
|
|
});
|
|
|
|
RefPtr<ASTNode> init;
|
|
if (!match(TokenType::Semicolon)) {
|
|
if (match_variable_declaration()) {
|
|
if (!match(TokenType::Var)) {
|
|
m_state.let_scopes.append(NonnullRefPtrVector<VariableDeclaration>());
|
|
in_scope = true;
|
|
}
|
|
init = parse_variable_declaration(true);
|
|
if (match_for_in_of())
|
|
return parse_for_in_of_statement(*init);
|
|
if (static_cast<VariableDeclaration&>(*init).declaration_kind() == DeclarationKind::Const) {
|
|
for (auto& declaration : static_cast<VariableDeclaration&>(*init).declarations()) {
|
|
if (!declaration.init())
|
|
syntax_error("Missing initializer in 'const' variable declaration");
|
|
}
|
|
}
|
|
} else if (match_expression()) {
|
|
init = parse_expression(0, Associativity::Right, { TokenType::In });
|
|
if (match_for_in_of())
|
|
return parse_for_in_of_statement(*init);
|
|
} else {
|
|
syntax_error("Unexpected token in for loop");
|
|
}
|
|
}
|
|
consume(TokenType::Semicolon);
|
|
|
|
RefPtr<Expression> test;
|
|
if (!match(TokenType::Semicolon))
|
|
test = parse_expression(0);
|
|
|
|
consume(TokenType::Semicolon);
|
|
|
|
RefPtr<Expression> update;
|
|
if (!match(TokenType::ParenClose))
|
|
update = parse_expression(0);
|
|
|
|
consume(TokenType::ParenClose);
|
|
|
|
TemporaryChange break_change(m_state.in_break_context, true);
|
|
TemporaryChange continue_change(m_state.in_continue_context, true);
|
|
auto body = parse_statement();
|
|
|
|
return create_ast_node<ForStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(init), move(test), move(update), move(body));
|
|
}
|
|
|
|
NonnullRefPtr<Statement> Parser::parse_for_in_of_statement(NonnullRefPtr<ASTNode> lhs)
|
|
{
|
|
auto rule_start = push_start();
|
|
if (is<VariableDeclaration>(*lhs)) {
|
|
auto declarations = static_cast<VariableDeclaration&>(*lhs).declarations();
|
|
if (declarations.size() > 1)
|
|
syntax_error("multiple declarations not allowed in for..in/of");
|
|
if (declarations.size() < 1)
|
|
syntax_error("need exactly one variable declaration in for..in/of");
|
|
else if (declarations.first().init() != nullptr)
|
|
syntax_error("variable initializer not allowed in for..in/of");
|
|
} else if (!lhs->is_identifier() && !is<ObjectExpression>(*lhs) && !is<MemberExpression>(*lhs) && !is<ArrayExpression>(*lhs)) {
|
|
syntax_error(String::formatted("Invalid left-hand side in for-loop ('{}')", lhs->class_name()));
|
|
}
|
|
auto in_or_of = consume();
|
|
|
|
if (in_or_of.type() != TokenType::In) {
|
|
if (is<MemberExpression>(*lhs)) {
|
|
auto& member = static_cast<MemberExpression const&>(*lhs);
|
|
if (member.object().is_identifier() && static_cast<Identifier const&>(member.object()).string() == "let"sv)
|
|
syntax_error("For of statement may not start with let.");
|
|
}
|
|
}
|
|
|
|
auto rhs = parse_expression(0);
|
|
consume(TokenType::ParenClose);
|
|
|
|
TemporaryChange break_change(m_state.in_break_context, true);
|
|
TemporaryChange continue_change(m_state.in_continue_context, true);
|
|
auto body = parse_statement();
|
|
if (in_or_of.type() == TokenType::In)
|
|
return create_ast_node<ForInStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(lhs), move(rhs), move(body));
|
|
return create_ast_node<ForOfStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(lhs), move(rhs), move(body));
|
|
}
|
|
|
|
NonnullRefPtr<DebuggerStatement> Parser::parse_debugger_statement()
|
|
{
|
|
auto rule_start = push_start();
|
|
consume(TokenType::Debugger);
|
|
consume_or_insert_semicolon();
|
|
return create_ast_node<DebuggerStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
|
|
}
|
|
|
|
bool Parser::match(TokenType type) const
|
|
{
|
|
return m_state.current_token.type() == type;
|
|
}
|
|
|
|
bool Parser::match_expression() const
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
return type == TokenType::BoolLiteral
|
|
|| type == TokenType::NumericLiteral
|
|
|| type == TokenType::BigIntLiteral
|
|
|| type == TokenType::StringLiteral
|
|
|| type == TokenType::TemplateLiteralStart
|
|
|| type == TokenType::NullLiteral
|
|
|| match_identifier()
|
|
|| type == TokenType::New
|
|
|| type == TokenType::CurlyOpen
|
|
|| type == TokenType::BracketOpen
|
|
|| type == TokenType::ParenOpen
|
|
|| type == TokenType::Function
|
|
|| type == TokenType::This
|
|
|| type == TokenType::Super
|
|
|| type == TokenType::RegexLiteral
|
|
|| type == TokenType::Slash // Wrongly recognized regex by lexer
|
|
|| type == TokenType::SlashEquals // Wrongly recognized regex by lexer (/=a/ is a valid regex)
|
|
|| type == TokenType::Yield
|
|
|| match_unary_prefixed_expression();
|
|
}
|
|
|
|
bool Parser::match_unary_prefixed_expression() const
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
return type == TokenType::PlusPlus
|
|
|| type == TokenType::MinusMinus
|
|
|| type == TokenType::ExclamationMark
|
|
|| type == TokenType::Tilde
|
|
|| type == TokenType::Plus
|
|
|| type == TokenType::Minus
|
|
|| type == TokenType::Typeof
|
|
|| type == TokenType::Void
|
|
|| type == TokenType::Delete;
|
|
}
|
|
|
|
bool Parser::match_secondary_expression(const Vector<TokenType>& forbidden) const
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
if (forbidden.contains_slow(type))
|
|
return false;
|
|
return type == TokenType::Plus
|
|
|| type == TokenType::PlusEquals
|
|
|| type == TokenType::Minus
|
|
|| type == TokenType::MinusEquals
|
|
|| type == TokenType::Asterisk
|
|
|| type == TokenType::AsteriskEquals
|
|
|| type == TokenType::Slash
|
|
|| type == TokenType::SlashEquals
|
|
|| type == TokenType::Percent
|
|
|| type == TokenType::PercentEquals
|
|
|| type == TokenType::DoubleAsterisk
|
|
|| type == TokenType::DoubleAsteriskEquals
|
|
|| type == TokenType::Equals
|
|
|| type == TokenType::EqualsEqualsEquals
|
|
|| type == TokenType::ExclamationMarkEqualsEquals
|
|
|| type == TokenType::EqualsEquals
|
|
|| type == TokenType::ExclamationMarkEquals
|
|
|| type == TokenType::GreaterThan
|
|
|| type == TokenType::GreaterThanEquals
|
|
|| type == TokenType::LessThan
|
|
|| type == TokenType::LessThanEquals
|
|
|| type == TokenType::ParenOpen
|
|
|| type == TokenType::Period
|
|
|| type == TokenType::BracketOpen
|
|
|| (type == TokenType::PlusPlus && !m_state.current_token.trivia_contains_line_terminator())
|
|
|| (type == TokenType::MinusMinus && !m_state.current_token.trivia_contains_line_terminator())
|
|
|| type == TokenType::In
|
|
|| type == TokenType::Instanceof
|
|
|| type == TokenType::QuestionMark
|
|
|| type == TokenType::Ampersand
|
|
|| type == TokenType::AmpersandEquals
|
|
|| type == TokenType::Pipe
|
|
|| type == TokenType::PipeEquals
|
|
|| type == TokenType::Caret
|
|
|| type == TokenType::CaretEquals
|
|
|| type == TokenType::ShiftLeft
|
|
|| type == TokenType::ShiftLeftEquals
|
|
|| type == TokenType::ShiftRight
|
|
|| type == TokenType::ShiftRightEquals
|
|
|| type == TokenType::UnsignedShiftRight
|
|
|| type == TokenType::UnsignedShiftRightEquals
|
|
|| type == TokenType::DoubleAmpersand
|
|
|| type == TokenType::DoubleAmpersandEquals
|
|
|| type == TokenType::DoublePipe
|
|
|| type == TokenType::DoublePipeEquals
|
|
|| type == TokenType::DoubleQuestionMark
|
|
|| type == TokenType::DoubleQuestionMarkEquals;
|
|
}
|
|
|
|
bool Parser::match_statement() const
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
return match_expression()
|
|
|| type == TokenType::Return
|
|
|| type == TokenType::Yield
|
|
|| type == TokenType::Do
|
|
|| type == TokenType::If
|
|
|| type == TokenType::Throw
|
|
|| type == TokenType::Try
|
|
|| type == TokenType::While
|
|
|| type == TokenType::With
|
|
|| type == TokenType::For
|
|
|| type == TokenType::CurlyOpen
|
|
|| type == TokenType::Switch
|
|
|| type == TokenType::Break
|
|
|| type == TokenType::Continue
|
|
|| type == TokenType::Var
|
|
|| type == TokenType::Debugger
|
|
|| type == TokenType::Semicolon;
|
|
}
|
|
|
|
bool Parser::match_export_or_import() const
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
return type == TokenType::Export
|
|
|| type == TokenType::Import;
|
|
}
|
|
|
|
bool Parser::match_declaration()
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
|
|
if (type == TokenType::Let && !m_state.strict_mode) {
|
|
return try_match_let_declaration();
|
|
}
|
|
|
|
return type == TokenType::Function
|
|
|| type == TokenType::Class
|
|
|| type == TokenType::Const
|
|
|| type == TokenType::Let;
|
|
}
|
|
|
|
bool Parser::try_match_let_declaration()
|
|
{
|
|
VERIFY(m_state.current_token.type() == TokenType::Let);
|
|
|
|
save_state();
|
|
|
|
ScopeGuard state_rollback = [&] {
|
|
load_state();
|
|
};
|
|
|
|
consume(TokenType::Let);
|
|
|
|
if (match_identifier_name() && m_state.current_token.value() != "in"sv)
|
|
return true;
|
|
|
|
if (match(TokenType::CurlyOpen) || match(TokenType::BracketOpen))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool Parser::match_variable_declaration()
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
|
|
if (type == TokenType::Let && !m_state.strict_mode) {
|
|
return try_match_let_declaration();
|
|
}
|
|
|
|
return type == TokenType::Var
|
|
|| type == TokenType::Let
|
|
|| type == TokenType::Const;
|
|
}
|
|
|
|
bool Parser::match_identifier() const
|
|
{
|
|
if (m_state.current_token.type() == TokenType::EscapedKeyword) {
|
|
if (m_state.current_token.value() == "let"sv)
|
|
return !m_state.strict_mode;
|
|
if (m_state.current_token.value() == "yield"sv)
|
|
return !m_state.strict_mode && !m_state.in_generator_function_context;
|
|
return true;
|
|
}
|
|
|
|
return m_state.current_token.type() == TokenType::Identifier
|
|
|| (m_state.current_token.type() == TokenType::Let && !m_state.strict_mode)
|
|
|| (m_state.current_token.type() == TokenType::Yield && !m_state.in_generator_function_context && !m_state.strict_mode); // See note in Parser::parse_identifier().
|
|
}
|
|
|
|
bool Parser::match_identifier_name() const
|
|
{
|
|
return m_state.current_token.is_identifier_name();
|
|
}
|
|
|
|
bool Parser::match_property_key() const
|
|
{
|
|
auto type = m_state.current_token.type();
|
|
return match_identifier_name()
|
|
|| type == TokenType::BracketOpen
|
|
|| type == TokenType::StringLiteral
|
|
|| type == TokenType::NumericLiteral
|
|
|| type == TokenType::BigIntLiteral;
|
|
}
|
|
|
|
bool Parser::done() const
|
|
{
|
|
return match(TokenType::Eof);
|
|
}
|
|
|
|
Token Parser::consume()
|
|
{
|
|
auto old_token = m_state.current_token;
|
|
m_state.current_token = m_state.lexer.next();
|
|
return old_token;
|
|
}
|
|
|
|
void Parser::consume_or_insert_semicolon()
|
|
{
|
|
// Semicolon was found and will be consumed
|
|
if (match(TokenType::Semicolon)) {
|
|
consume();
|
|
return;
|
|
}
|
|
// Insert semicolon if...
|
|
// ...token is preceded by one or more newlines
|
|
if (m_state.current_token.trivia_contains_line_terminator())
|
|
return;
|
|
// ...token is a closing curly brace
|
|
if (match(TokenType::CurlyClose))
|
|
return;
|
|
// ...token is eof
|
|
if (match(TokenType::Eof))
|
|
return;
|
|
|
|
// No rule for semicolon insertion applies -> syntax error
|
|
expected("Semicolon");
|
|
}
|
|
|
|
Token Parser::consume_identifier()
|
|
{
|
|
if (match(TokenType::Identifier))
|
|
return consume(TokenType::Identifier);
|
|
|
|
if (match(TokenType::EscapedKeyword))
|
|
return consume(TokenType::EscapedKeyword);
|
|
|
|
// Note that 'let' is not a reserved keyword, but our lexer considers it such
|
|
// As it's pretty nice to have that (for syntax highlighting and such), we'll
|
|
// special-case it here instead.
|
|
if (match(TokenType::Let)) {
|
|
if (m_state.strict_mode)
|
|
syntax_error("'let' is not allowed as an identifier in strict mode");
|
|
return consume();
|
|
}
|
|
|
|
if (match(TokenType::Yield)) {
|
|
if (m_state.strict_mode || m_state.in_generator_function_context)
|
|
syntax_error("Identifier must not be a reserved word in strict mode ('yield')");
|
|
return consume();
|
|
}
|
|
|
|
expected("Identifier");
|
|
return consume();
|
|
}
|
|
|
|
// https://tc39.es/ecma262/#prod-IdentifierReference
|
|
Token Parser::consume_identifier_reference()
|
|
{
|
|
if (match(TokenType::Identifier))
|
|
return consume(TokenType::Identifier);
|
|
|
|
if (match(TokenType::EscapedKeyword)) {
|
|
auto name = m_state.current_token.value();
|
|
if (name == "await"sv)
|
|
syntax_error("Identifier reference may not be 'await'");
|
|
else if (m_state.strict_mode && (name == "let"sv || name == "yield"sv))
|
|
syntax_error(String::formatted("'{}' is not allowed as an identifier in strict mode", name));
|
|
|
|
return consume();
|
|
}
|
|
|
|
// See note in Parser::parse_identifier().
|
|
if (match(TokenType::Let)) {
|
|
if (m_state.strict_mode)
|
|
syntax_error("'let' is not allowed as an identifier in strict mode");
|
|
return consume();
|
|
}
|
|
|
|
if (match(TokenType::Yield)) {
|
|
if (m_state.strict_mode)
|
|
syntax_error("Identifier reference may not be 'yield' in strict mode");
|
|
return consume();
|
|
}
|
|
|
|
if (match(TokenType::Await)) {
|
|
syntax_error("Identifier reference may not be 'await'");
|
|
return consume();
|
|
}
|
|
|
|
expected(Token::name(TokenType::Identifier));
|
|
return consume();
|
|
}
|
|
|
|
Token Parser::consume(TokenType expected_type)
|
|
{
|
|
if (!match(expected_type)) {
|
|
expected(Token::name(expected_type));
|
|
}
|
|
auto token = consume();
|
|
if (expected_type == TokenType::Identifier) {
|
|
if (m_state.strict_mode && is_strict_reserved_word(token.value()))
|
|
syntax_error(String::formatted("Identifier must not be a reserved word in strict mode ('{}')", token.value()));
|
|
}
|
|
return token;
|
|
}
|
|
|
|
Token Parser::consume_and_validate_numeric_literal()
|
|
{
|
|
auto is_unprefixed_octal_number = [](const StringView& value) {
|
|
return value.length() > 1 && value[0] == '0' && is_ascii_digit(value[1]);
|
|
};
|
|
auto literal_start = position();
|
|
auto token = consume(TokenType::NumericLiteral);
|
|
if (m_state.strict_mode && is_unprefixed_octal_number(token.value()))
|
|
syntax_error("Unprefixed octal number not allowed in strict mode", literal_start);
|
|
if (match_identifier_name() && m_state.current_token.trivia().is_empty())
|
|
syntax_error("Numeric literal must not be immediately followed by identifier");
|
|
return token;
|
|
}
|
|
|
|
void Parser::expected(const char* what)
|
|
{
|
|
auto message = m_state.current_token.message();
|
|
if (message.is_empty())
|
|
message = String::formatted("Unexpected token {}. Expected {}", m_state.current_token.name(), what);
|
|
syntax_error(message);
|
|
}
|
|
|
|
Position Parser::position() const
|
|
{
|
|
return {
|
|
m_state.current_token.line_number(),
|
|
m_state.current_token.line_column(),
|
|
m_state.current_token.offset(),
|
|
};
|
|
}
|
|
|
|
bool Parser::try_parse_arrow_function_expression_failed_at_position(const Position& position) const
|
|
{
|
|
auto it = m_token_memoizations.find(position);
|
|
if (it == m_token_memoizations.end())
|
|
return false;
|
|
|
|
return (*it).value.try_parse_arrow_function_expression_failed;
|
|
}
|
|
|
|
void Parser::set_try_parse_arrow_function_expression_failed_at_position(const Position& position, bool failed)
|
|
{
|
|
m_token_memoizations.set(position, { failed });
|
|
}
|
|
|
|
void Parser::syntax_error(const String& message, Optional<Position> position)
|
|
{
|
|
if (!position.has_value())
|
|
position = this->position();
|
|
m_state.errors.append({ message, position });
|
|
}
|
|
|
|
void Parser::save_state()
|
|
{
|
|
m_saved_state.append(m_state);
|
|
}
|
|
|
|
void Parser::load_state()
|
|
{
|
|
VERIFY(!m_saved_state.is_empty());
|
|
m_state = m_saved_state.take_last();
|
|
}
|
|
|
|
void Parser::discard_saved_state()
|
|
{
|
|
m_saved_state.take_last();
|
|
}
|
|
|
|
void Parser::check_identifier_name_for_assignment_validity(StringView name, bool force_strict)
|
|
{
|
|
// FIXME: this is now called from multiple places maybe the error message should be dynamic?
|
|
if (any_of(s_reserved_words, [&](auto& value) { return name == value; })) {
|
|
syntax_error("Binding pattern target may not be a reserved word");
|
|
} else if (m_state.strict_mode || force_strict) {
|
|
if (name.is_one_of("arguments"sv, "eval"sv))
|
|
syntax_error("Binding pattern target may not be called 'arguments' or 'eval' in strict mode");
|
|
else if (is_strict_reserved_word(name))
|
|
syntax_error(String::formatted("Binding pattern target may not be called '{}' in strict mode", name));
|
|
}
|
|
}
|
|
|
|
NonnullRefPtr<ImportStatement> Parser::parse_import_statement(Program& program)
|
|
{
|
|
auto rule_start = push_start();
|
|
if (program.type() != Program::Type::Module)
|
|
syntax_error("Cannot use import statement outside a module");
|
|
|
|
consume(TokenType::Import);
|
|
|
|
if (match(TokenType::StringLiteral)) {
|
|
auto module_name = consume(TokenType::StringLiteral).value();
|
|
return create_ast_node<ImportStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, module_name);
|
|
}
|
|
|
|
auto match_imported_binding = [&] {
|
|
return match_identifier() || match(TokenType::Yield) || match(TokenType::Await);
|
|
};
|
|
|
|
auto match_as = [&] {
|
|
return match(TokenType::Identifier) && m_state.current_token.original_value() == "as"sv;
|
|
};
|
|
|
|
bool continue_parsing = true;
|
|
|
|
struct ImportWithLocation {
|
|
ImportStatement::ImportEntry entry;
|
|
Position position;
|
|
};
|
|
|
|
Vector<ImportWithLocation> entries_with_location;
|
|
|
|
if (match_imported_binding()) {
|
|
auto id_position = position();
|
|
auto bound_name = consume().value();
|
|
entries_with_location.append({ { "default", bound_name }, id_position });
|
|
|
|
if (match(TokenType::Comma)) {
|
|
consume(TokenType::Comma);
|
|
} else {
|
|
continue_parsing = false;
|
|
}
|
|
}
|
|
|
|
if (!continue_parsing) {
|
|
// skip the rest
|
|
} else if (match(TokenType::Asterisk)) {
|
|
consume(TokenType::Asterisk);
|
|
|
|
if (!match_as())
|
|
syntax_error(String::formatted("Unexpected token: {}", m_state.current_token.name()));
|
|
|
|
consume(TokenType::Identifier);
|
|
|
|
if (match_imported_binding()) {
|
|
auto namespace_position = position();
|
|
auto namespace_name = consume().value();
|
|
entries_with_location.append({ { "*", namespace_name }, namespace_position });
|
|
} else {
|
|
syntax_error(String::formatted("Unexpected token: {}", m_state.current_token.name()));
|
|
}
|
|
|
|
} else if (match(TokenType::CurlyOpen)) {
|
|
consume(TokenType::CurlyOpen);
|
|
|
|
while (!done() && !match(TokenType::CurlyClose)) {
|
|
if (match_identifier_name()) {
|
|
auto require_as = !match_imported_binding();
|
|
auto name_position = position();
|
|
auto name = consume().value();
|
|
|
|
if (match_as()) {
|
|
consume(TokenType::Identifier);
|
|
|
|
auto alias_position = position();
|
|
auto alias = consume_identifier().value();
|
|
check_identifier_name_for_assignment_validity(alias);
|
|
|
|
entries_with_location.append({ { name, alias }, alias_position });
|
|
} else if (require_as) {
|
|
syntax_error(String::formatted("Unexpected reserved word '{}'", name));
|
|
} else {
|
|
check_identifier_name_for_assignment_validity(name);
|
|
|
|
entries_with_location.append({ { name, name }, name_position });
|
|
}
|
|
} else {
|
|
expected("identifier");
|
|
break;
|
|
}
|
|
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
|
|
consume(TokenType::Comma);
|
|
}
|
|
|
|
consume(TokenType::CurlyClose);
|
|
} else {
|
|
expected("import clauses");
|
|
}
|
|
|
|
auto from_statement = consume(TokenType::Identifier).value();
|
|
if (from_statement != "from"sv)
|
|
syntax_error(String::formatted("Expected 'from' got {}", from_statement));
|
|
|
|
auto module_name = consume(TokenType::StringLiteral).value();
|
|
|
|
Vector<ImportStatement::ImportEntry> entries;
|
|
entries.ensure_capacity(entries_with_location.size());
|
|
|
|
for (auto& entry : entries_with_location) {
|
|
for (auto& import_statement : program.imports()) {
|
|
if (import_statement.has_bound_name(entry.entry.local_name))
|
|
syntax_error(String::formatted("Identifier '{}' already declared", entry.entry.local_name), entry.position);
|
|
}
|
|
|
|
for (auto& new_entry : entries) {
|
|
if (new_entry.local_name == entry.entry.local_name)
|
|
syntax_error(String::formatted("Identifier '{}' already declared", entry.entry.local_name), entry.position);
|
|
}
|
|
|
|
entries.append(move(entry.entry));
|
|
}
|
|
|
|
return create_ast_node<ImportStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, module_name, move(entries));
|
|
}
|
|
|
|
NonnullRefPtr<ExportStatement> Parser::parse_export_statement(Program& program)
|
|
{
|
|
auto rule_start = push_start();
|
|
if (program.type() != Program::Type::Module)
|
|
syntax_error("Cannot use export statement outside a module");
|
|
|
|
auto match_as = [&] {
|
|
return match(TokenType::Identifier) && m_state.current_token.original_value() == "as"sv;
|
|
};
|
|
|
|
auto match_from = [&] {
|
|
return match(TokenType::Identifier) && m_state.current_token.original_value() == "from"sv;
|
|
};
|
|
|
|
auto match_default = [&] {
|
|
return match(TokenType::Default) && m_state.current_token.original_value() == "default"sv;
|
|
};
|
|
|
|
consume(TokenType::Export);
|
|
|
|
struct EntryAndLocation {
|
|
ExportStatement::ExportEntry entry;
|
|
Position position;
|
|
|
|
void to_module_request(String from_module)
|
|
{
|
|
entry.kind = ExportStatement::ExportEntry::Kind::ModuleRequest;
|
|
entry.module_request = from_module;
|
|
}
|
|
};
|
|
|
|
Vector<EntryAndLocation> entries_with_location;
|
|
|
|
RefPtr<ASTNode> expression = {};
|
|
|
|
if (match_default()) {
|
|
auto default_position = position();
|
|
consume(TokenType::Default);
|
|
|
|
String local_name;
|
|
|
|
if (match(TokenType::Class)) {
|
|
auto class_expression = parse_class_expression(false);
|
|
local_name = class_expression->name();
|
|
expression = move(class_expression);
|
|
} else if (match(TokenType::Function)) {
|
|
auto func_expr = parse_function_node<FunctionExpression>();
|
|
local_name = func_expr->name();
|
|
expression = move(func_expr);
|
|
// TODO: Allow async function
|
|
} else if (match_expression()) {
|
|
expression = parse_expression(2);
|
|
consume_or_insert_semicolon();
|
|
local_name = "*default*";
|
|
} else {
|
|
expected("Declaration or assignment expression");
|
|
}
|
|
|
|
entries_with_location.append({ { "default", local_name }, default_position });
|
|
} else {
|
|
enum FromSpecifier {
|
|
NotAllowed,
|
|
Optional,
|
|
Required
|
|
} check_for_from { NotAllowed };
|
|
|
|
if (match(TokenType::Asterisk)) {
|
|
auto asterisk_position = position();
|
|
consume(TokenType::Asterisk);
|
|
|
|
if (match_as()) {
|
|
consume(TokenType::Identifier);
|
|
if (match_identifier_name()) {
|
|
auto namespace_position = position();
|
|
auto exported_name = consume().value();
|
|
entries_with_location.append({ { exported_name, "*" }, namespace_position });
|
|
} else {
|
|
expected("identifier");
|
|
}
|
|
} else {
|
|
entries_with_location.append({ { {}, "*" }, asterisk_position });
|
|
}
|
|
check_for_from = Required;
|
|
} else if (match_declaration()) {
|
|
auto decl_position = position();
|
|
auto declaration = parse_declaration();
|
|
if (is<FunctionDeclaration>(*declaration)) {
|
|
auto& func = static_cast<FunctionDeclaration&>(*declaration);
|
|
entries_with_location.append({ { func.name(), func.name() }, func.source_range().start });
|
|
} else if (is<ClassDeclaration>(*declaration)) {
|
|
auto& class_declaration = static_cast<ClassDeclaration&>(*declaration);
|
|
entries_with_location.append({ { class_declaration.class_name(), class_declaration.class_name() }, class_declaration.source_range().start });
|
|
} else {
|
|
VERIFY(is<VariableDeclaration>(*declaration));
|
|
auto& variables = static_cast<VariableDeclaration&>(*declaration);
|
|
for (auto& decl : variables.declarations()) {
|
|
decl.target().visit(
|
|
[&](NonnullRefPtr<Identifier> const& identifier) {
|
|
entries_with_location.append({ { identifier->string(), identifier->string() }, identifier->source_range().start });
|
|
},
|
|
[&](NonnullRefPtr<BindingPattern> const& binding) {
|
|
binding->for_each_bound_name([&](auto& name) {
|
|
entries_with_location.append({ { name, name }, decl_position });
|
|
});
|
|
});
|
|
}
|
|
}
|
|
expression = declaration;
|
|
} else if (match(TokenType::Var)) {
|
|
auto variable_position = position();
|
|
auto variable_declaration = parse_variable_declaration();
|
|
for (auto& decl : variable_declaration->declarations()) {
|
|
decl.target().visit(
|
|
[&](NonnullRefPtr<Identifier> const& identifier) {
|
|
entries_with_location.append({ { identifier->string(), identifier->string() }, identifier->source_range().start });
|
|
},
|
|
[&](NonnullRefPtr<BindingPattern> const& binding) {
|
|
binding->for_each_bound_name([&](auto& name) {
|
|
entries_with_location.append({ { name, name }, variable_position });
|
|
});
|
|
});
|
|
}
|
|
expression = variable_declaration;
|
|
} else if (match(TokenType::CurlyOpen)) {
|
|
consume(TokenType::CurlyOpen);
|
|
|
|
while (!done() && !match(TokenType::CurlyClose)) {
|
|
if (match_identifier_name()) {
|
|
auto identifier_position = position();
|
|
auto identifier = consume().value();
|
|
|
|
if (match_as()) {
|
|
consume(TokenType::Identifier);
|
|
if (match_identifier_name()) {
|
|
auto export_name = consume().value();
|
|
entries_with_location.append({ { export_name, identifier }, identifier_position });
|
|
} else {
|
|
expected("identifier name");
|
|
}
|
|
} else {
|
|
entries_with_location.append({ { identifier, identifier }, identifier_position });
|
|
}
|
|
} else {
|
|
expected("identifier");
|
|
break;
|
|
}
|
|
|
|
if (!match(TokenType::Comma))
|
|
break;
|
|
|
|
consume(TokenType::Comma);
|
|
}
|
|
|
|
consume(TokenType::CurlyClose);
|
|
check_for_from = Optional;
|
|
} else {
|
|
syntax_error("Unexpected token 'export'", rule_start.position());
|
|
}
|
|
|
|
if (check_for_from != NotAllowed && match_from()) {
|
|
consume(TokenType::Identifier);
|
|
if (match(TokenType::StringLiteral)) {
|
|
auto from_specifier = consume().value();
|
|
for (auto& entry : entries_with_location)
|
|
entry.to_module_request(from_specifier);
|
|
} else {
|
|
expected("ModuleSpecifier");
|
|
}
|
|
} else if (check_for_from == Required) {
|
|
expected("from");
|
|
}
|
|
|
|
if (check_for_from != NotAllowed)
|
|
consume_or_insert_semicolon();
|
|
}
|
|
|
|
Vector<ExportStatement::ExportEntry> entries;
|
|
entries.ensure_capacity(entries_with_location.size());
|
|
|
|
for (auto& entry : entries_with_location) {
|
|
for (auto& export_statement : program.exports()) {
|
|
if (export_statement.has_export(entry.entry.export_name))
|
|
syntax_error(String::formatted("Duplicate export with name: '{}'", entry.entry.export_name), entry.position);
|
|
}
|
|
|
|
for (auto& new_entry : entries) {
|
|
if (new_entry.export_name == entry.entry.export_name)
|
|
syntax_error(String::formatted("Duplicate export with name: '{}'", entry.entry.export_name), entry.position);
|
|
}
|
|
|
|
entries.append(move(entry.entry));
|
|
}
|
|
|
|
return create_ast_node<ExportStatement>({ m_state.current_token.filename(), rule_start.position(), position() }, move(expression), move(entries));
|
|
}
|
|
|
|
}
|