mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-11-03 23:00:58 +00:00
3f3f45580a
Each of these strings would previously rely on StringView's char const* constructor overload, which would call __builtin_strlen on the string. Since we now have operator ""sv, we can replace these with much simpler versions. This opens the door to being able to remove StringView(char const*). No functional changes.
96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "Token.h"
|
|
|
|
#include <AK/HashMap.h>
|
|
#include <AK/String.h>
|
|
#include <AK/StringView.h>
|
|
|
|
namespace JS {
|
|
|
|
class Lexer {
|
|
public:
|
|
explicit Lexer(StringView source, StringView filename = "(unknown)"sv, size_t line_number = 1, size_t line_column = 0);
|
|
|
|
Token next();
|
|
|
|
StringView source() const { return m_source; };
|
|
StringView filename() const { return m_filename; };
|
|
|
|
void disallow_html_comments() { m_allow_html_comments = false; };
|
|
|
|
Token force_slash_as_regex();
|
|
|
|
private:
|
|
void consume();
|
|
bool consume_exponent();
|
|
bool consume_octal_number();
|
|
bool consume_hexadecimal_number();
|
|
bool consume_binary_number();
|
|
bool consume_decimal_number();
|
|
|
|
bool is_unicode_character() const;
|
|
u32 current_code_point() const;
|
|
|
|
bool is_eof() const;
|
|
bool is_line_terminator() const;
|
|
bool is_whitespace() const;
|
|
Optional<u32> is_identifier_unicode_escape(size_t& identifier_length) const;
|
|
Optional<u32> is_identifier_start(size_t& identifier_length) const;
|
|
Optional<u32> is_identifier_middle(size_t& identifier_length) const;
|
|
bool is_line_comment_start(bool line_has_token_yet) const;
|
|
bool is_block_comment_start() const;
|
|
bool is_block_comment_end() const;
|
|
bool is_numeric_literal_start() const;
|
|
bool match(char, char) const;
|
|
bool match(char, char, char) const;
|
|
bool match(char, char, char, char) const;
|
|
template<typename Callback>
|
|
bool match_numeric_literal_separator_followed_by(Callback) const;
|
|
bool slash_means_division() const;
|
|
|
|
TokenType consume_regex_literal();
|
|
|
|
StringView m_source;
|
|
size_t m_position { 0 };
|
|
Token m_current_token;
|
|
char m_current_char { 0 };
|
|
bool m_eof { false };
|
|
|
|
StringView m_filename;
|
|
size_t m_line_number { 1 };
|
|
size_t m_line_column { 0 };
|
|
|
|
bool m_regex_is_in_character_class { false };
|
|
|
|
struct TemplateState {
|
|
bool in_expr;
|
|
u8 open_bracket_count;
|
|
};
|
|
Vector<TemplateState> m_template_states;
|
|
|
|
bool m_allow_html_comments { true };
|
|
|
|
Optional<size_t> m_hit_invalid_unicode;
|
|
|
|
static HashMap<FlyString, TokenType> s_keywords;
|
|
static HashMap<String, TokenType> s_three_char_tokens;
|
|
static HashMap<String, TokenType> s_two_char_tokens;
|
|
static HashMap<char, TokenType> s_single_char_tokens;
|
|
|
|
struct ParsedIdentifiers : public RefCounted<ParsedIdentifiers> {
|
|
// Resolved identifiers must be kept alive for the duration of the parsing stage, otherwise
|
|
// the only references to these strings are deleted by the Token destructor.
|
|
HashTable<FlyString> identifiers;
|
|
};
|
|
|
|
RefPtr<ParsedIdentifiers> m_parsed_identifiers;
|
|
};
|
|
|
|
}
|