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61ac1d3ffa
This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 JS {
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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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void consume_exponent();
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bool is_eof() 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_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_numeric_literal_start() const;
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bool match(char, char) const;
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bool match(char, char, char) const;
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bool match(char, char, char, char) const;
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bool slash_means_division() const;
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StringView m_source;
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size_t m_position { 0 };
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Token m_current_token;
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int m_current_char { 0 };
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size_t m_line_number { 1 };
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size_t m_line_column { 0 };
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bool m_regex_is_in_character_class { false };
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struct TemplateState {
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bool in_expr;
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u8 open_bracket_count;
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};
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Vector<TemplateState> m_template_states;
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static HashMap<String, TokenType> s_keywords;
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static HashMap<String, TokenType> s_three_char_tokens;
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static HashMap<String, TokenType> s_two_char_tokens;
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static HashMap<char, TokenType> s_single_char_tokens;
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};
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}
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