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AK+Format: Do some housekeeping in the format implementation.

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asynts 2020-10-02 15:21:30 +02:00 • committed by Andreas Kling
parent ac5e08a541
commit 6351a56d27
13 changed files with 476 additions and 640 deletions
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166
AK/PrintfImplementation.h
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@ -38,172 +38,6 @@ namespace PrintfImplementation {
static constexpr const char* printf_hex_digits_lower = "0123456789abcdef";
static constexpr const char* printf_hex_digits_upper = "0123456789ABCDEF";
enum class Align {
Left,
Center,
Right,
};
enum class SignMode {
OnlyIfNeeded,
Always,
Reserved
};
// The worst case is that we have the largest 64-bit value formatted as binary number, this would take
// 65 bytes. Choosing a larger power of two won't hurt and is a bit of mitigation against out-of-bounds accesses.
inline size_t convert_unsigned_to_string(u64 value, Array<u8, 128>& buffer, u8 base, bool upper_case)
{
ASSERT(base >= 2 && base <= 16);
static constexpr const char* lowercase_lookup = "0123456789abcdef";
static constexpr const char* uppercase_lookup = "0123456789ABCDEF";
if (value == 0) {
buffer[0] = '0';
return 1;
}
size_t used = 0;
while (value > 0) {
if (upper_case)
buffer[used++] = uppercase_lookup[value % base];
else
buffer[used++] = lowercase_lookup[value % base];
value /= base;
}
// Reverse the list; I came up with this logic in like three seconds so it's probably wrong in some edge case.
for (size_t i = 0; i < used / 2; ++i)
swap(buffer[i], buffer[used - i - 1]);
return used;
}
inline size_t convert_unsigned_to_string(
u64 value,
StringBuilder& builder,
u8 base = 10,
bool prefix = false,
bool upper_case = false,
bool zero_pad = false,
Align align = Align::Right,
size_t width = 0,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded,
bool is_negative = false)
{
Array<u8, 128> buffer;
const auto used_by_significant_digits = convert_unsigned_to_string(value, buffer, base, upper_case);
size_t used_by_prefix = sign_mode == SignMode::OnlyIfNeeded ? static_cast<size_t>(is_negative) : 1;
if (prefix) {
if (base == 8)
used_by_prefix += 1;
else if (base == 16)
used_by_prefix += 2;
else if (base == 2)
used_by_prefix += 2;
}
const auto put_prefix = [&]() {
if (is_negative)
builder.append('-');
else if (sign_mode == SignMode::Always)
builder.append('+');
else if (sign_mode == SignMode::Reserved)
builder.append(' ');
if (prefix) {
if (base == 2) {
if (upper_case)
builder.append("0B");
else
builder.append("0b");
} else if (base == 8) {
builder.append("0");
} else if (base == 16) {
if (upper_case)
builder.append("0X");
else
builder.append("0x");
}
}
};
const auto put_padding = [&](size_t amount, char fill) {
for (size_t i = 0; i < amount; ++i)
builder.append(fill);
};
const auto put_digits = [&]() {
builder.append(StringView { buffer.span().trim(used_by_significant_digits) });
};
const auto used_by_field = used_by_significant_digits + used_by_prefix;
const auto used_by_padding = width < used_by_field ? 0 : width - used_by_field;
if (align == Align::Left) {
const auto used_by_right_padding = used_by_padding;
put_prefix();
put_digits();
put_padding(used_by_right_padding, fill);
return used_by_field + used_by_right_padding;
}
if (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, fill);
put_prefix();
put_digits();
put_padding(used_by_right_padding, fill);
return used_by_left_padding + used_by_field + used_by_right_padding;
}
if (align == Align::Right) {
const auto used_by_left_padding = used_by_padding;
if (zero_pad) {
put_prefix();
put_padding(used_by_left_padding, '0');
put_digits();
} else {
put_padding(used_by_left_padding, fill);
put_prefix();
put_digits();
}
return used_by_field + used_by_left_padding;
}
ASSERT_NOT_REACHED();
}
inline size_t convert_signed_to_string(
i64 value,
StringBuilder& builder,
u8 base = 10,
bool common_prefix = false,
bool upper_case = false,
bool zero_pad = false,
Align align = Align::Right,
size_t width = 0,
char fill = ' ',
SignMode sign_mode = SignMode::OnlyIfNeeded)
{
bool is_negative = value < 0;
if (value < 0)
value = -value;
return convert_unsigned_to_string(static_cast<size_t>(value), builder, base, common_prefix, upper_case, zero_pad, align, width, fill, sign_mode, is_negative);
}
#ifdef __serenity__
extern "C" size_t strlen(const char*);
#else