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/*
* Copyright (c) 2021, Itamar S. <itamar8910@gmail.com>
* 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 "AST.h"
#include <LibCpp/Lexer.h>
namespace Cpp {
class Parser final {
public:
explicit Parser(const StringView&);
~Parser() = default;
NonnullRefPtr<TranslationUnit> parse();
bool eof() const;
RefPtr<ASTNode> eof_node() const;
RefPtr<ASTNode> node_at(Position) const;
Optional<Token> token_at(Position) const;
RefPtr<const TranslationUnit> root_node() const { return m_root_node; }
StringView text_of_node(const ASTNode&) const;
StringView text_of_token(const Cpp::Token& token) const;
void print_tokens() const;
Vector<String> errors() const { return m_errors; }
private:
enum class DeclarationType {
Function,
Variable,
Enum,
Struct,
};
bool done();
Optional<DeclarationType> match_declaration();
Optional<DeclarationType> match_declaration_in_translation_unit();
Optional<DeclarationType> match_declaration_in_function_definition();
bool match_function_declaration();
bool match_comment();
bool match_preprocessor();
bool match_whitespace();
bool match_variable_declaration();
bool match_expression();
bool match_function_call();
bool match_secondary_expression();
bool match_enum_declaration();
bool match_struct_declaration();
bool match_literal();
bool match_unary_expression();
bool match_boolean_literal();
bool match_keyword(const String&);
bool match_block_statement();
Optional<NonnullRefPtrVector<Parameter>> parse_parameter_list(ASTNode& parent);
Optional<Token> consume_whitespace();
void consume_preprocessor();
NonnullRefPtr<Declaration> parse_declaration(ASTNode& parent, DeclarationType);
NonnullRefPtr<FunctionDeclaration> parse_function_declaration(ASTNode& parent);
NonnullRefPtr<FunctionDefinition> parse_function_definition(ASTNode& parent);
NonnullRefPtr<Statement> parse_statement(ASTNode& parent);
NonnullRefPtr<VariableDeclaration> parse_variable_declaration(ASTNode& parent);
NonnullRefPtr<Expression> parse_expression(ASTNode& parent);
NonnullRefPtr<Expression> parse_primary_expression(ASTNode& parent);
NonnullRefPtr<Expression> parse_secondary_expression(ASTNode& parent, NonnullRefPtr<Expression> lhs);
NonnullRefPtr<FunctionCall> parse_function_call(ASTNode& parent);
NonnullRefPtr<StringLiteral> parse_string_literal(ASTNode& parent);
NonnullRefPtr<ReturnStatement> parse_return_statement(ASTNode& parent);
NonnullRefPtr<EnumDeclaration> parse_enum_declaration(ASTNode& parent);
NonnullRefPtr<StructOrClassDeclaration> parse_struct_or_class_declaration(ASTNode& parent, StructOrClassDeclaration::Type);
NonnullRefPtr<MemberDeclaration> parse_member_declaration(ASTNode& parent);
NonnullRefPtr<Expression> parse_literal(ASTNode& parent);
NonnullRefPtr<UnaryExpression> parse_unary_expression(ASTNode& parent);
NonnullRefPtr<BooleanLiteral> parse_boolean_literal(ASTNode& parent);
NonnullRefPtr<Type> parse_type(ASTNode& parent);
NonnullRefPtr<BinaryExpression> parse_binary_expression(ASTNode& parent, NonnullRefPtr<Expression> lhs, BinaryOp);
NonnullRefPtr<AssignmentExpression> parse_assignment_expression(ASTNode& parent, NonnullRefPtr<Expression> lhs, AssignmentOp);
NonnullRefPtr<ForStatement> parse_for_statement(ASTNode& parent);
NonnullRefPtr<BlockStatement> parse_block_statement(ASTNode& parent);
NonnullRefPtr<Comment> parse_comment(ASTNode& parent);
NonnullRefPtr<IfStatement> parse_if_statement(ASTNode& parent);
bool match(Token::Type);
Token consume(Token::Type);
Token consume();
Token consume_keyword(const String&);
Token peek() const;
Optional<Token> peek(Token::Type) const;
Position position() const;
StringView text_of_range(Position start, Position end) const;
void save_state();
void load_state();
enum class Context {
InTranslationUnit,
InFunctionDefinition,
};
struct State {
Context context { Context::InTranslationUnit };
size_t token_index { 0 };
};
void error(StringView message = {});
size_t node_span_size(const ASTNode& node) const;
template<class T, class... Args>
NonnullRefPtr<T>
create_ast_node(ASTNode& parent, const Position& start, Optional<Position> end, Args&&... args)
{
auto node = adopt(*new T(&parent, start, end, forward<Args>(args)...));
m_nodes.append(node);
return node;
}
NonnullRefPtr<TranslationUnit>
create_root_ast_node(const Position& start, Position end)
{
auto node = adopt(*new TranslationUnit(nullptr, start, end));
m_nodes.append(node);
m_root_node = node;
return node;
}
StringView m_program;
Vector<StringView> m_lines;
Vector<Token> m_tokens;
State m_state;
Vector<State> m_saved_states;
RefPtr<TranslationUnit> m_root_node;
NonnullRefPtrVector<ASTNode> m_nodes;
Vector<String> m_errors;
};
}
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