mirror of
https://github.com/RGBCube/serenity
synced 2025-05-15 06:34:59 +00:00
00b61a212f
Giving the lexer the ability to generate errors adds unnecessary
complexity - also it only calls its syntax_error() function in one place
anyway ("unterminated string literal"). But since the lexer *also* emits
tokens like Eof or UnterminatedStringLiteral, it should be up to the
consumer of these tokens to decide what to do.
Also remove the option to not print errors to stderr as that's not
relevant anymore.
114 lines
4.7 KiB
C++
114 lines
4.7 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "AST.h"
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#include "Lexer.h"
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#include <AK/NonnullRefPtr.h>
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namespace JS {
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enum class Associativity {
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Left,
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Right
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};
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class Parser {
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public:
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explicit Parser(Lexer lexer);
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NonnullRefPtr<Program> parse_program();
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template<typename FunctionNodeType>
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NonnullRefPtr<FunctionNodeType> parse_function_node(bool need_function_keyword = true);
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NonnullRefPtr<Statement> parse_statement();
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NonnullRefPtr<BlockStatement> parse_block_statement();
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NonnullRefPtr<ReturnStatement> parse_return_statement();
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NonnullRefPtr<VariableDeclaration> parse_variable_declaration();
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NonnullRefPtr<ForStatement> parse_for_statement();
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NonnullRefPtr<IfStatement> parse_if_statement();
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NonnullRefPtr<ThrowStatement> parse_throw_statement();
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NonnullRefPtr<TryStatement> parse_try_statement();
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NonnullRefPtr<CatchClause> parse_catch_clause();
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NonnullRefPtr<SwitchStatement> parse_switch_statement();
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NonnullRefPtr<SwitchCase> parse_switch_case();
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NonnullRefPtr<BreakStatement> parse_break_statement();
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NonnullRefPtr<ContinueStatement> parse_continue_statement();
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NonnullRefPtr<DoWhileStatement> parse_do_while_statement();
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NonnullRefPtr<WhileStatement> parse_while_statement();
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NonnullRefPtr<DebuggerStatement> parse_debugger_statement();
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NonnullRefPtr<ConditionalExpression> parse_conditional_expression(NonnullRefPtr<Expression> test);
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NonnullRefPtr<Expression> parse_expression(int min_precedence, Associativity associate = Associativity::Right);
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NonnullRefPtr<Expression> parse_primary_expression();
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NonnullRefPtr<Expression> parse_unary_prefixed_expression();
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NonnullRefPtr<ObjectExpression> parse_object_expression();
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NonnullRefPtr<ArrayExpression> parse_array_expression();
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NonnullRefPtr<TemplateLiteral> parse_template_literal(bool is_tagged);
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NonnullRefPtr<Expression> parse_secondary_expression(NonnullRefPtr<Expression>, int min_precedence, Associativity associate = Associativity::Right);
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NonnullRefPtr<CallExpression> parse_call_expression(NonnullRefPtr<Expression>);
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NonnullRefPtr<NewExpression> parse_new_expression();
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RefPtr<FunctionExpression> try_parse_arrow_function_expression(bool expect_parens);
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bool has_errors() const { m_parser_state.m_has_errors; }
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private:
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friend class ScopePusher;
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int operator_precedence(TokenType) const;
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Associativity operator_associativity(TokenType) const;
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bool match_expression() const;
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bool match_unary_prefixed_expression() const;
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bool match_secondary_expression() const;
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bool match_statement() const;
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bool match_variable_declaration() const;
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bool match_identifier_name() const;
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bool match(TokenType type) const;
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bool done() const;
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void expected(const char* what);
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void syntax_error(const String& message, size_t line = 0, size_t column = 0);
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Token consume();
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Token consume(TokenType type);
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void consume_or_insert_semicolon();
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void save_state();
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void load_state();
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struct ParserState {
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Lexer m_lexer;
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Token m_current_token;
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bool m_has_errors = false;
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Vector<NonnullRefPtrVector<VariableDeclaration>> m_var_scopes;
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Vector<NonnullRefPtrVector<VariableDeclaration>> m_let_scopes;
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explicit ParserState(Lexer);
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};
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ParserState m_parser_state;
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Vector<ParserState> m_saved_state;
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};
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}
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