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/* Parsing driver.
Copyright (C) 2025 Free Software Foundation, Inc.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#pragma once
#include <optional>
#include "elna/boot/ast.h"
#include "location.hh"
namespace elna::boot
{
source_position make_position(const yy::location& location);
class syntax_error final : public diagnostic
{
std::string message;
public:
syntax_error(const std::string& message, const yy::location& location);
std::string what() const override;
};
class driver final : public diagnostic_container
{
public:
std::unique_ptr<unit> tree;
/// Set once the module terminator has been parsed. The lexer stops
/// scanning then, so whatever follows is not program text.
bool finished{ false };
driver() = default;
};
constexpr char escape_invalid_char = '\xff';
/**
* Parses a character literal and produces code point integer
* representation.
*
* \param escape Text to parse.
* \return Code point.
*/
std::optional<std::uint32_t> parse_character_literal(const char *escape);
/**
* Parses and unescapes a single byte character. Fails if the input inside
* single quotes contains more than a single character. Rejects unicode.
*
* \param escape Text to unescape.
* \return Unescaped character.
*/
std::optional<std::uint8_t> parse_byte_literal(const char *escape);
/**
* Parses and unescapes a string.
*
* \param escape Text to unescape.
* \return Unescaped string.
*/
std::optional<std::string> parse_string_literal(const char *escape);
template<typename T>
std::optional<std::pair<std::make_unsigned_t<T>, integer_sign>>
parse_integer(const char *text, const int base = 10)
{
using unsigned_t = std::make_unsigned_t<T>;
errno = 0;
std::uint64_t result = strtoull(text, nullptr, base);
if (errno == ERANGE || result > std::numeric_limits<unsigned_t>::max())
{
return std::nullopt;
}
return std::make_pair(static_cast<unsigned_t>(result),
std::is_signed_v<T> ? integer_sign::unmarked : integer_sign::_unsigned);
}
}
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