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/*
* Copyright (c) 2021, Tim Flynn <trflynn89@serenityos.org>
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Token.h"
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/StringView.h>
namespace SQL::AST {
class Lexer {
public:
explicit Lexer(StringView source);
Token next();
private:
void consume(StringBuilder* = nullptr);
bool consume_whitespace_and_comments();
bool consume_numeric_literal(StringBuilder&);
bool consume_string_literal(StringBuilder&);
bool consume_quoted_identifier(StringBuilder&);
bool consume_blob_literal(StringBuilder&);
bool consume_exponent(StringBuilder&);
bool consume_hexadecimal_number(StringBuilder&);
bool match(char a, char b) const;
bool is_identifier_start() const;
bool is_identifier_middle() const;
bool is_numeric_literal_start() const;
bool is_string_literal_start() const;
bool is_string_literal_end() const;
bool is_quoted_identifier_start() const;
bool is_quoted_identifier_end() const;
bool is_blob_literal_start() const;
bool is_line_comment_start() const;
bool is_block_comment_start() const;
bool is_block_comment_end() const;
bool is_line_break() const;
bool is_eof() const;
static HashMap<String, TokenType> s_keywords;
static HashMap<char, TokenType> s_one_char_tokens;
static HashMap<String, TokenType> s_two_char_tokens;
StringView m_source;
size_t m_line_number { 1 };
size_t m_line_column { 0 };
char m_current_char { 0 };
bool m_eof { false };
size_t m_position { 0 };
};
}
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