386 lines
11 KiB
C++
386 lines
11 KiB
C++
/*
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* <Short Description>
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* Copyright (C) 2025 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <iostream>
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#include <sstream>
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#include <blt/logging/fmt_tokenizer.h>
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namespace blt::logging
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{
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fmt_token_type fmt_tokenizer_t::get_type(const char c)
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{
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switch (c)
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{
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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return fmt_token_type::NUMBER;
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case '+':
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return fmt_token_type::PLUS;
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case '-':
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return fmt_token_type::MINUS;
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case '.':
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return fmt_token_type::DOT;
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case ':':
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return fmt_token_type::COLON;
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case ' ':
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return fmt_token_type::SPACE;
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case '#':
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return fmt_token_type::POUND;
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default:
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return fmt_token_type::STRING;
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}
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}
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std::optional<fmt_token_t> fmt_tokenizer_t::next()
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{
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if (m_pos >= m_fmt.size())
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return {};
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switch (const auto base_type = get_type(m_fmt[m_pos]))
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{
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case fmt_token_type::SPACE:
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case fmt_token_type::PLUS:
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case fmt_token_type::MINUS:
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case fmt_token_type::DOT:
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case fmt_token_type::COLON:
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case fmt_token_type::POUND:
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return fmt_token_t{base_type, std::string_view{m_fmt.data() + m_pos++, 1}};
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default:
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{
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const auto begin = m_pos;
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for (; m_pos < m_fmt.size() && get_type(m_fmt[m_pos]) == base_type; ++m_pos)
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{
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}
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return fmt_token_t{base_type, std::string_view{m_fmt.data() + begin, m_pos - begin}};
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}
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}
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}
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std::vector<fmt_token_t> fmt_tokenizer_t::tokenize(const std::string_view fmt)
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{
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m_fmt = fmt;
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m_pos = 0;
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std::vector<fmt_token_t> tokens;
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while (auto token = next())
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tokens.push_back(*token);
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return tokens;
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}
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const fmt_spec_t& fmt_parser_t::parse(const std::string_view fmt)
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{
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m_spec = {};
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m_pos = 0;
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m_tokens = m_tokenizer.tokenize(fmt);
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parse_fmt_field();
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return m_spec;
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}
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void fmt_parser_t::parse_fmt_field()
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{
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if (!has_next())
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throw std::runtime_error("Expected token when parsing format field");
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const auto [type, value] = peek();
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switch (type)
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{
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case fmt_token_type::NUMBER:
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parse_arg_id();
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if (has_next())
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{
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if (peek().type == fmt_token_type::COLON)
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parse_fmt_spec();
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else
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throw std::runtime_error("Expected ':' when parsing format field after arg id!");
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}
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break;
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case fmt_token_type::COLON:
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parse_fmt_spec();
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break;
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case fmt_token_type::STRING:
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case fmt_token_type::SPACE:
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case fmt_token_type::DOT:
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case fmt_token_type::MINUS:
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case fmt_token_type::PLUS:
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case fmt_token_type::POUND:
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{
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std::stringstream ss;
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ss << "Expected unknown token '" << static_cast<u8>(type) << "' value '" << value << "' when parsing format field";
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throw std::runtime_error(ss.str());
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}
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}
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if (has_next())
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parse_type();
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}
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void fmt_parser_t::parse_arg_id()
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{
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const auto [type, value] = next();
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if (type != fmt_token_type::NUMBER)
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{
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std::stringstream ss;
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ss << "Expected number when parsing arg id, unexpected value '" << value << '\'';
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throw std::runtime_error(ss.str());
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}
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m_spec.arg_id = std::stoll(std::string(value));
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}
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void fmt_parser_t::parse_fmt_spec()
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{
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// consume :
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consume();
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auto [type, value] = peek();
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switch (type)
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{
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case fmt_token_type::STRING:
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return;
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case fmt_token_type::COLON:
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{
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std::stringstream ss;
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ss << "(Stage (Begin)) Invalid token type " << static_cast<u8>(type) << " value " << value;
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throw std::runtime_error(ss.str());
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}
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case fmt_token_type::NUMBER:
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parse_fmt_spec_width();
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break;
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case fmt_token_type::DOT:
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parse_fmt_spec_precision();
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break;
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case fmt_token_type::SPACE:
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case fmt_token_type::MINUS:
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case fmt_token_type::PLUS:
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parse_fmt_spec_sign();
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break;
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case fmt_token_type::POUND:
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parse_fmt_spec_form();
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break;
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}
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}
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// handle start of fmt, with sign
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void fmt_parser_t::parse_fmt_spec_sign()
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{
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parse_sign();
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if (!has_next())
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return;
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auto [type, value] = peek();
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switch (type)
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{
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case fmt_token_type::STRING:
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return;
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case fmt_token_type::SPACE:
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case fmt_token_type::MINUS:
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case fmt_token_type::PLUS:
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case fmt_token_type::COLON:
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{
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std::stringstream ss;
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ss << "(Stage (Sign)) Invalid token type " << static_cast<u8>(type) << " value " << value;
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throw std::runtime_error(ss.str());
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}
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case fmt_token_type::NUMBER:
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parse_fmt_spec_width();
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break;
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case fmt_token_type::DOT:
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parse_fmt_spec_precision();
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break;
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case fmt_token_type::POUND:
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parse_fmt_spec_form();
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break;
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}
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}
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void fmt_parser_t::parse_fmt_spec_form()
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{
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parse_form();
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if (!has_next())
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return;
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auto [type, value] = peek();
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switch (type)
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{
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case fmt_token_type::STRING:
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return;
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case fmt_token_type::SPACE:
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case fmt_token_type::COLON:
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case fmt_token_type::MINUS:
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case fmt_token_type::PLUS:
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case fmt_token_type::POUND:
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{
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std::stringstream ss;
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ss << "(Stage (Form)) Invalid token type " << static_cast<u8>(type) << " value " << value;
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throw std::runtime_error(ss.str());
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}
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case fmt_token_type::NUMBER:
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parse_fmt_spec_width();
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break;
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case fmt_token_type::DOT:
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parse_fmt_spec_precision();
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break;
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}
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}
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// handle width parsing
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void fmt_parser_t::parse_fmt_spec_width()
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{
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parse_width();
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if (!has_next())
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return;
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auto [type, value] = peek();
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switch (type)
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{
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case fmt_token_type::STRING:
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return;
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case fmt_token_type::COLON:
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case fmt_token_type::MINUS:
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case fmt_token_type::PLUS:
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case fmt_token_type::SPACE:
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case fmt_token_type::POUND:
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case fmt_token_type::NUMBER:
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{
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std::stringstream ss;
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ss << "(Stage (Width)) Invalid token type " << static_cast<u8>(type) << " value " << value;
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throw std::runtime_error(ss.str());
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}
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case fmt_token_type::DOT:
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parse_fmt_spec_precision();
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break;
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}
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}
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void fmt_parser_t::parse_fmt_spec_precision()
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{
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// consume .
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consume();
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parse_precision();
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}
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void fmt_parser_t::parse_sign()
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{
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auto [_, value] = next();
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if (value.size() > 1)
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{
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std::stringstream ss;
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ss << "Sign contains more than one character, we are not sure how to interpret this. Value '" << value << "'";
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throw std::runtime_error(ss.str());
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}
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switch (value[0])
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{
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case '+':
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m_spec.sign = fmt_sign_t::PLUS;
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break;
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case '-':
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m_spec.sign = fmt_sign_t::MINUS;
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break;
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case ' ':
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m_spec.sign = fmt_sign_t::SPACE;
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break;
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default:
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{
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std::stringstream ss;
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ss << "Invalid sign " << value[0];
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throw std::runtime_error(ss.str());
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}
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}
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}
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void fmt_parser_t::parse_form()
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{
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consume();
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m_spec.alternate_form = true;
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}
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void fmt_parser_t::parse_width()
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{
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auto [_, value] = next();
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if (value.front() == '0')
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m_spec.leading_zeros = true;
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m_spec.width = std::stoll(std::string(value));
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}
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void fmt_parser_t::parse_precision()
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{
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if (!has_next())
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throw std::runtime_error("Missing token when parsing precision");
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auto [type, value] = next();
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if (type != fmt_token_type::NUMBER)
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throw std::runtime_error("Expected number when parsing precision");
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m_spec.precision = std::stoll(std::string(value));
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}
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void fmt_parser_t::parse_type()
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{
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auto [_, value] = next();
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if (value.size() != 1)
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{
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std::stringstream ss;
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ss << "Type contains more than one character, we are not sure how to interpret this value '" << value << "'";
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throw std::runtime_error(ss.str());
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}
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m_spec.uppercase = std::isupper(value.front());
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switch (value.front())
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{
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case 'b':
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case 'B':
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m_spec.type = fmt_type_t::BINARY;
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break;
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case 'c':
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m_spec.type = fmt_type_t::CHAR;
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break;
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case 'd':
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m_spec.type = fmt_type_t::DECIMAL;
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break;
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case 'o':
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m_spec.type = fmt_type_t::OCTAL;
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break;
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case 'x':
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case 'X':
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m_spec.type = fmt_type_t::HEX;
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break;
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case 'a':
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case 'A':
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m_spec.type = fmt_type_t::HEX_FLOAT;
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break;
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case 'e':
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case 'E':
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m_spec.type = fmt_type_t::EXPONENT;
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break;
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case 'f':
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case 'F':
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m_spec.type = fmt_type_t::FIXED_POINT;
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break;
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case 'g':
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case 'G':
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m_spec.type = fmt_type_t::GENERAL;
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break;
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case 't':
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case 'T':
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m_spec.type = fmt_type_t::TYPE;
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break;
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default:
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std::stringstream ss;
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ss << "Invalid type " << value;
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throw std::runtime_error(ss.str());
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}
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}
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}
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