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/*
* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/NonnullRefPtr.h>
#include <AK/StringBuilder.h>
#include <LibJS/AST.h>
#include <LibJS/Lexer.h>
#include <stdio.h>
namespace JS {
enum class Associativity {
Left,
Right
};
class Parser {
public:
explicit Parser(Lexer lexer);
NonnullRefPtr<Program> parse_program();
template<typename FunctionNodeType>
NonnullRefPtr<FunctionNodeType> parse_function_node(bool check_for_function_and_name = true);
NonnullRefPtr<Statement> parse_statement();
NonnullRefPtr<BlockStatement> parse_block_statement();
NonnullRefPtr<ReturnStatement> parse_return_statement();
NonnullRefPtr<VariableDeclaration> parse_variable_declaration(bool with_semicolon = true);
NonnullRefPtr<Statement> parse_for_statement();
NonnullRefPtr<Statement> parse_for_in_of_statement(NonnullRefPtr<ASTNode> lhs);
NonnullRefPtr<IfStatement> parse_if_statement();
NonnullRefPtr<ThrowStatement> parse_throw_statement();
NonnullRefPtr<TryStatement> parse_try_statement();
NonnullRefPtr<CatchClause> parse_catch_clause();
NonnullRefPtr<SwitchStatement> parse_switch_statement();
NonnullRefPtr<SwitchCase> parse_switch_case();
NonnullRefPtr<BreakStatement> parse_break_statement();
NonnullRefPtr<ContinueStatement> parse_continue_statement();
NonnullRefPtr<DoWhileStatement> parse_do_while_statement();
NonnullRefPtr<WhileStatement> parse_while_statement();
NonnullRefPtr<DebuggerStatement> parse_debugger_statement();
NonnullRefPtr<ConditionalExpression> parse_conditional_expression(NonnullRefPtr<Expression> test);
NonnullRefPtr<Expression> parse_expression(int min_precedence, Associativity associate = Associativity::Right, Vector<TokenType> forbidden = {});
NonnullRefPtr<Expression> parse_primary_expression();
NonnullRefPtr<Expression> parse_unary_prefixed_expression();
NonnullRefPtr<ObjectExpression> parse_object_expression();
NonnullRefPtr<ArrayExpression> parse_array_expression();
NonnullRefPtr<StringLiteral> parse_string_literal(Token token);
NonnullRefPtr<TemplateLiteral> parse_template_literal(bool is_tagged);
NonnullRefPtr<Expression> parse_secondary_expression(NonnullRefPtr<Expression>, int min_precedence, Associativity associate = Associativity::Right);
NonnullRefPtr<CallExpression> parse_call_expression(NonnullRefPtr<Expression>);
NonnullRefPtr<NewExpression> parse_new_expression();
RefPtr<FunctionExpression> try_parse_arrow_function_expression(bool expect_parens);
RefPtr<Statement> try_parse_labelled_statement();
struct Error {
String message;
size_t line;
size_t column;
String to_string() const
{
if (line == 0 || column == 0)
return message;
return String::format("%s (line: %zu, column: %zu)", message.characters(), line, column);
}
String source_location_hint(const StringView& source, const char spacer = ' ', const char indicator = '^') const
{
if (line == 0 || column == 0)
return {};
StringBuilder builder;
builder.append(source.split_view('\n', true)[line - 1]);
builder.append('\n');
for (size_t i = 0; i < column - 1; ++i)
builder.append(spacer);
builder.append(indicator);
return builder.build();
}
};
bool has_errors() const { return m_parser_state.m_errors.size(); }
const Vector<Error>& errors() const { return m_parser_state.m_errors; }
void print_errors() const
{
for (auto& error : m_parser_state.m_errors)
fprintf(stderr, "SyntaxError: %s\n", error.to_string().characters());
}
private:
friend class ScopePusher;
int operator_precedence(TokenType) const;
Associativity operator_associativity(TokenType) const;
bool match_expression() const;
bool match_unary_prefixed_expression() const;
bool match_secondary_expression(Vector<TokenType> forbidden = {}) const;
bool match_statement() const;
bool match_variable_declaration() const;
bool match_identifier_name() const;
bool match(TokenType type) const;
bool done() const;
void expected(const char* what);
void syntax_error(const String& message, size_t line = 0, size_t column = 0);
Token consume();
Token consume(TokenType type);
void consume_or_insert_semicolon();
void save_state();
void load_state();
enum class UseStrictDirectiveState {
None,
Looking,
Found,
};
struct ParserState {
Lexer m_lexer;
Token m_current_token;
Vector<Error> m_errors;
Vector<NonnullRefPtrVector<VariableDeclaration>> m_var_scopes;
Vector<NonnullRefPtrVector<VariableDeclaration>> m_let_scopes;
UseStrictDirectiveState m_use_strict_directive { UseStrictDirectiveState::None };
bool m_strict_mode { false };
explicit ParserState(Lexer);
};
ParserState m_parser_state;
Vector<ParserState> m_saved_state;
};
}
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