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LibSQL: Move Lexer and Parser machinery to AST directory
The SQL engine is expected to be a fairly sizeable piece of software. Therefore we're starting to restructure the codebase for growth.
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24 changed files with 281 additions and 278 deletions
57
Userland/Libraries/LibSQL/AST/Lexer.h
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57
Userland/Libraries/LibSQL/AST/Lexer.h
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/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "Token.h"
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#include <AK/HashMap.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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namespace SQL::AST {
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class Lexer {
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public:
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explicit Lexer(StringView source);
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Token next();
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private:
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void consume();
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bool consume_whitespace_and_comments();
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bool consume_numeric_literal();
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bool consume_string_literal();
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bool consume_blob_literal();
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bool consume_exponent();
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bool consume_hexadecimal_number();
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bool match(char a, char b) const;
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bool is_identifier_start() const;
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bool is_identifier_middle() const;
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bool is_numeric_literal_start() const;
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bool is_string_literal_start() const;
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bool is_string_literal_end() const;
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bool is_blob_literal_start() const;
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bool is_line_comment_start() const;
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bool is_block_comment_start() const;
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bool is_block_comment_end() const;
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bool is_line_break() const;
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bool is_eof() const;
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static HashMap<String, TokenType> s_keywords;
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static HashMap<char, TokenType> s_one_char_tokens;
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static HashMap<String, TokenType> s_two_char_tokens;
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StringView m_source;
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size_t m_line_number { 1 };
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size_t m_line_column { 0 };
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char m_current_char { 0 };
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bool m_eof { false };
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size_t m_position { 0 };
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};
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}
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