0c42aece36
LibJS parses JavaScript as UTF-8, so when creating a string, we must
transcode it to UTF-16 to handle encoded surrogate pairs.
For example, consider the following string:
"\ud83d\ude00"
The UTF-8 encoding of this surrogate pair is:
0xf0 0x9f 0x98 0x80
However, LibJS will currently store the two surrogates individually as
UTF-8 encoded bytes, rather than combining the pair:
0xed 0xa0 0xb8, 0xed 0xb8 0x80
These are not equivalent. So, as String.prototype becomes UTF-16 aware,
this encoding will no longer work for abstractions like strict equality.
38 lines
832 B
C++
38 lines
832 B
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.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/Vector.h>
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#include <LibJS/Heap/Cell.h>
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namespace JS {
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class PrimitiveString final : public Cell {
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public:
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explicit PrimitiveString(String);
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virtual ~PrimitiveString();
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String const& string() const { return m_string; }
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Vector<u16> const& utf16_string() const;
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Utf16View utf16_string_view() const;
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private:
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virtual const char* class_name() const override { return "PrimitiveString"; }
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String m_string;
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mutable Vector<u16> m_utf16_string;
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};
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PrimitiveString* js_string(Heap&, Utf16View const&);
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PrimitiveString* js_string(VM&, Utf16View const&);
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PrimitiveString* js_string(Heap&, String);
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PrimitiveString* js_string(VM&, String);
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}
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