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dd112421b4
While debugging test failures, it's pretty frustrating to have to go do printf debugging to figure out what test is failing right now. While watching your JS Raytracer stream it seemed like this was pretty furstrating as well. So I wanted to start working on improving the diagnostics here. In the future I hope we can eventually be able to plumb the info down to the Error classes so any thrown exceptions will contain enough metadata to know where they came from.
68 lines
2.3 KiB
C++
68 lines
2.3 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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bool has_errors() const { return m_has_errors; }
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private:
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void consume();
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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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void syntax_error(const char*);
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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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bool m_has_errors = false;
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size_t m_line_number = 1;
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size_t m_line_column = 1;
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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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