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LibJS: Transcode UTF-8 strings to UTF-16 and add UTF-16 accessors
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.
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4 changed files with 73 additions and 3 deletions
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@ -246,6 +246,7 @@ public:
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u64 encoded() const { return m_value.encoded; }
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String to_string(GlobalObject&, bool legacy_null_to_empty_string = false) const;
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Vector<u16> to_utf16_string(GlobalObject&) const;
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PrimitiveString* to_primitive_string(GlobalObject&);
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Value to_primitive(GlobalObject&, PreferredType preferred_type = PreferredType::Default) const;
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Object* to_object(GlobalObject&) const;
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