RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 13:07:46 +00:00
Code Issues Activity Actions

LibJS: Allow PrimitiveString to be created with a UTF-16 string

Browse source 
PrimitiveString may currently only be created with a UTF-8 string, and
it transcodes on the fly when a UTF-16 string is needed. Allow creating
a PrimitiveString from a UTF-16 string to avoid unnecessary transcoding
when the caller only wants UTF-16.
This commit is contained in:
Timothy Flynn 2021-08-01 19:02:19 -04:00 • committed by Andreas Kling
parent 4c2cc419f9
commit b6ff7f4fcc
2 changed files with 62 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

61
Userland/Libraries/LibJS/Runtime/PrimitiveString.cpp
View file

@ -12,7 +12,14 @@
namespace JS {
PrimitiveString::PrimitiveString(String string)
: m_string(move(string))
: m_utf8_string(move(string))
, m_has_utf8_string(true)
{
}
PrimitiveString::PrimitiveString(Vector<u16> string)
: m_utf16_string(move(string))
, m_has_utf16_string(true)
{
}
@ -20,10 +27,21 @@ PrimitiveString::~PrimitiveString()
{
}
String const& PrimitiveString::string() const
{
if (!m_has_utf8_string) {
m_utf8_string = utf16_string_view().to_utf8(Utf16View::AllowInvalidCodeUnits::Yes);
m_has_utf8_string = true;
}
return m_utf8_string;
}
Vector<u16> const& PrimitiveString::utf16_string() const
{
if (m_utf16_string.is_empty() && !m_string.is_empty())
m_utf16_string = AK::utf8_to_utf16(m_string);
if (!m_has_utf16_string) {
m_utf16_string = AK::utf8_to_utf16(m_utf8_string);
m_has_utf16_string = true;
}
return m_utf16_string;
}
@ -32,24 +50,45 @@ Utf16View PrimitiveString::utf16_string_view() const
return Utf16View { utf16_string() };
}
PrimitiveString* js_string(Heap& heap, Utf16View const& string)
PrimitiveString* js_string(Heap& heap, Utf16View const& view)
{
if (string.is_empty())
if (view.is_empty())
return &heap.vm().empty_string();
if (string.length_in_code_units() == 1) {
u16 code_unit = string.code_unit_at(0);
if (view.length_in_code_units() == 1) {
u16 code_unit = view.code_unit_at(0);
if (is_ascii(code_unit))
return &heap.vm().single_ascii_character_string(static_cast<u8>(code_unit));
}
auto utf8_string = string.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes);
return heap.allocate_without_global_object<PrimitiveString>(move(utf8_string));
Vector<u16> string;
string.ensure_capacity(view.length_in_code_units());
string.append(view.data(), view.length_in_code_units());
return js_string(heap, move(string));
}
PrimitiveString* js_string(VM& vm, Utf16View const& string)
PrimitiveString* js_string(VM& vm, Utf16View const& view)
{
return js_string(vm.heap(), string);
return js_string(vm.heap(), view);
}
PrimitiveString* js_string(Heap& heap, Vector<u16> string)
{
if (string.is_empty())
return &heap.vm().empty_string();
if (string.size() == 1) {
u16 code_unit = string.at(0);
if (is_ascii(code_unit))
return &heap.vm().single_ascii_character_string(static_cast<u8>(code_unit));
}
return heap.allocate_without_global_object<PrimitiveString>(move(string));
}
PrimitiveString* js_string(VM& vm, Vector<u16> string)
{
return js_string(vm.heap(), move(string));
}
PrimitiveString* js_string(Heap& heap, String string)