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AK+Format: Add support for integer to character casts.

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Now the following is possible:

    outf("{:c}", 75); // K
This commit is contained in:
asynts 2020-09-29 14:07:39 +02:00 committed by Andreas Kling
parent f221a95a71
commit 1175ecf1dd
Notes: sideshowbarker 2024-07-19 02:08:00 +09:00 
Author: https://github.com/asynts
Commit: https://github.com/SerenityOS/serenity/commit/1175ecf1dd5
Pull-request: https://github.com/SerenityOS/serenity/pull/3640
2 changed files with 48 additions and 3 deletions
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45
AK/Format.cpp
View file

@ -366,10 +366,8 @@ void Formatter<T, typename EnableIf<IsIntegral<T>::value>::Type>::format(StringB
{
if (m_precision != value_not_set)
ASSERT_NOT_REACHED();
if (m_mode == Mode::Character)
TODO();
u8 base;
u8 base = 0;
bool upper_case = false;
if (m_mode == Mode::Binary) {
base = 2;
@ -385,12 +383,53 @@ void Formatter<T, typename EnableIf<IsIntegral<T>::value>::Type>::format(StringB
} else if (m_mode == Mode::HexadecimalUppercase) {
base = 16;
upper_case = true;
} else if (m_mode == Mode::Character) {
// special case
} else {
ASSERT_NOT_REACHED();
}
auto width = decode_value(m_width, context);
const auto put_padding = [&](size_t amount, char fill) {
for (size_t i = 0; i < amount; ++i)
builder.append(fill);
};
if (m_mode == Mode::Character) {
// FIXME: We just support ASCII for now, in the future maybe unicode?
ASSERT(value >= 0 && value <= 127);
const size_t used_by_value = 1;
const auto used_by_padding = width < used_by_value ? 0 : width - used_by_value;
if (m_align == Align::Left || m_align == Align::Default) {
const auto used_by_right_padding = used_by_padding;
builder.append(static_cast<char>(value));
put_padding(used_by_right_padding, m_fill);
return;
}
if (m_align == Align::Center) {
const auto used_by_left_padding = used_by_padding / 2;
const auto used_by_right_padding = ceil_div<size_t, size_t>(used_by_padding, 2);
put_padding(used_by_left_padding, m_fill);
builder.append(static_cast<char>(value));
put_padding(used_by_right_padding, m_fill);
return;
}
if (m_align == Align::Right) {
const auto used_by_left_padding = used_by_padding;
put_padding(used_by_left_padding, m_fill);
builder.append(static_cast<char>(value));
return;
}
ASSERT_NOT_REACHED();
}
PrintfImplementation::Align align;
if (m_align == Align::Left)
align = PrintfImplementation::Align::Left;

6
AK/Tests/TestFormat.cpp
View file

@ -130,4 +130,10 @@ TEST_CASE(complex_string_specifiers)
EXPECT_EQ(String::formatted("{:^9}", "abcd"), " abcd ");
}
TEST_CASE(cast_integer_to_character)
{
EXPECT_EQ(String::formatted("{:c}", static_cast<int>('a')), "a");
EXPECT_EQ(String::formatted("{:c}", static_cast<unsigned int>('f')), "f");
}
TEST_MAIN(Format)