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LibJS: Transcode UTF-8 strings to UTF-16 and add UTF-16 accessors

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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.
This commit is contained in:
Timothy Flynn 2021-07-20 10:46:53 -04:00 • committed by Andreas Kling
parent 0e25d2393f
commit 0c42aece36
4 changed files with 73 additions and 3 deletions
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10
Userland/Libraries/LibJS/Runtime/PrimitiveString.h
View file

@ -7,6 +7,7 @@
#pragma once
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibJS/Heap/Cell.h>
namespace JS {
@ -16,14 +17,21 @@ public:
explicit PrimitiveString(String);
virtual ~PrimitiveString();
const String& string() const { return m_string; }
String const& string() const { return m_string; }
Vector<u16> const& utf16_string() const;
Utf16View utf16_string_view() const;
private:
virtual const char* class_name() const override { return "PrimitiveString"; }
String m_string;
mutable Vector<u16> m_utf16_string;
};
PrimitiveString* js_string(Heap&, Utf16View const&);
PrimitiveString* js_string(VM&, Utf16View const&);
PrimitiveString* js_string(Heap&, String);
PrimitiveString* js_string(VM&, String);