70 lines
1.4 KiB
C++
70 lines
1.4 KiB
C++
#ifndef FURC_FRONT_LEXER_HPP
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#define FURC_FRONT_LEXER_HPP
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#include "furc/front/token.hpp"
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namespace furc {
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namespace front {
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/**
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* @brief Lexer.
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*
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* Furlang's lazy tokenizer.
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*/
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class lexer {
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public:
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lexer() = default;
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/**
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* @brief Construct a new lexer.
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*
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* @param filename Filename for debugging.
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* @param content Content.
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*/
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lexer(std::string_view filename, std::string_view content);
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~lexer() = default;
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/**
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* @brief Move constructor.
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*/
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lexer(lexer&&) = default;
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lexer(const lexer&) = delete;
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/**
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* @brief Move constructor.
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*/
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lexer& operator=(lexer&&) = default;
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lexer& operator=(const lexer&) = delete;
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public:
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/**
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* @brief Returns a handle to next token.
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*
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* @return The token handle.
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*/
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token_r next_token();
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/**
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* @brief Checks whether the cursor is at the EOF.
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*
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* @return true if the cursor is at the EOF.
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*/
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bool empty() const { return m_cursor >= m_content.size(); }
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private:
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void next();
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char get(std::size_t offset = 0) const;
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void skip_spaces();
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location current_location();
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private:
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std::string_view m_filename;
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std::string_view m_content;
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std::size_t m_cursor = 0;
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std::size_t m_row = 0;
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std::size_t m_lineStart = 0;
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};
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} // namespace front
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} // namespace furc
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#endif // FURC_FRONT_LEXER_HPP
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