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https://github.com/LadybirdBrowser/ladybird.git
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00182a2405
This ports the lexer to UTF-16 and deals with the immediate fallout up to the AST. The AST will be dealt with in upcoming commits. The lexer will still accept UTF-8 strings as input, and will transcode them to UTF-16 for lexing. This doesn't actually incur a new allocation, as we were already converting the input StringView to a ByteString for each lexer. One immediate logical benefit here is that we do not need to know off- hand how many UTF-8 bytes some special code points occupy. They all happen to be a single UTF-16 code unit. So instead of advancing the lexer by 3 positions in some cases, we can just always advance by 1.
40 lines
1 KiB
C++
40 lines
1 KiB
C++
/*
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* Copyright (c) 2022-2023, Andreas Kling <andreas@ladybird.org>
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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 <AK/String.h>
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#include <AK/Utf16String.h>
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#include <AK/Vector.h>
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#include <LibJS/Export.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Position.h>
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namespace JS {
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class JS_API SourceCode : public RefCounted<SourceCode> {
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public:
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static NonnullRefPtr<SourceCode const> create(String filename, Utf16String code);
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String const& filename() const { return m_filename; }
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Utf16String const& code() const { return m_code; }
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SourceRange range_from_offsets(u32 start_offset, u32 end_offset) const;
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private:
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SourceCode(String filename, Utf16String code);
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String m_filename;
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Utf16String m_code;
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// For fast mapping of offsets to line/column numbers, we build a list of
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// starting points (with byte offsets into the source string) and which
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// line:column they map to. This can then be binary-searched.
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void fill_position_cache() const;
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Vector<Position> mutable m_cached_positions;
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};
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}
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