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Reduce library size

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This commit is contained in:
Victor Zverovich 2020-05-01 15:23:09 -07:00
parent e9fdea90b5
commit d6abb2fa03
2 changed files with 76 additions and 88 deletions
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2
include/fmt/format-inl.h
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@ -602,7 +602,7 @@ class bigint {
int num_bigits() const { return static_cast<int>(bigits_.size()) + exp_; }
bigint& operator<<=(int shift) {
FMT_NOINLINE bigint& operator<<=(int shift) {
assert(shift >= 0);
exp_ += shift / bigit_bits;
shift %= bigit_bits;

162
include/fmt/format.h
View File

@ -1413,31 +1413,47 @@ inline OutputIt write_padded(OutputIt out,
return write_padded(out, specs, size, size, f);
}
template <typename Char> struct write_int_params {
// Data for write_int that doesn't depend on output iterator type. It is used to
// avoid template code bloat.
template <typename Char> struct write_int_data {
std::size_t size;
std::size_t padding;
Char fill;
write_int_data(int num_digits, string_view prefix,
basic_format_specs<Char>& specs)
: size(prefix.size() + to_unsigned(num_digits)),
padding(0),
fill(specs.fill[0]) {
if (specs.align == align::numeric) {
auto width = to_unsigned(specs.width);
if (width > size) {
padding = width - size;
size = width;
}
} else if (specs.precision > num_digits) {
size = prefix.size() + to_unsigned(specs.precision);
padding = to_unsigned(specs.precision - num_digits);
fill = static_cast<Char>('0');
}
if (specs.align == align::none) specs.align = align::right;
}
};
template <typename Char>
write_int_params<Char> make_write_int_params(int num_digits, string_view prefix,
basic_format_specs<Char>& specs) {
std::size_t size = prefix.size() + to_unsigned(num_digits);
Char fill = specs.fill[0];
std::size_t padding = 0;
if (specs.align == align::numeric) {
auto width = to_unsigned(specs.width);
if (width > size) {
padding = width - size;
size = width;
}
} else if (specs.precision > num_digits) {
size = prefix.size() + to_unsigned(specs.precision);
padding = to_unsigned(specs.precision - num_digits);
fill = static_cast<Char>('0');
}
if (specs.align == align::none) specs.align = align::right;
return {size, padding, fill};
// Writes an integer in the format
// <left-padding><prefix><numeric-padding><digits><right-padding>
// where <digits> are written by f(it).
template <typename OutputIt, typename Char, typename F>
OutputIt write_int(OutputIt out, int num_digits, string_view prefix,
basic_format_specs<Char> specs, F f) {
auto data = write_int_data<Char>(num_digits, prefix, specs);
using iterator = remove_reference_t<decltype(reserve(out, 0))>;
return write_padded(out, specs, data.size, [=](iterator it) {
if (prefix.size() != 0)
it = copy_str<Char>(prefix.begin(), prefix.end(), it);
it = std::fill_n(it, data.padding, data.fill);
return f(it);
});
}
// This template provides operations for formatting and writing data into a
@ -1458,21 +1474,6 @@ template <typename Range> class basic_writer {
return internal::reserve(out_, n);
}
// Writes an integer in the format
// <left-padding><prefix><numeric-padding><digits><right-padding>
// where <digits> are written by f(it).
template <typename F>
void write_int(int num_digits, string_view prefix, format_specs specs, F f) {
auto params = make_write_int_params(num_digits, prefix, specs);
out_ = write_padded(out_, specs, params.size, [=](reserve_iterator it) {
if (prefix.size() != 0)
it = copy_str<char_type>(prefix.begin(), prefix.end(), it);
it = std::fill_n(it, params.padding, params.fill);
f(it);
return it;
});
}
// Writes a decimal integer.
template <typename Int> void write_decimal(Int value) {
auto abs_value = static_cast<uint32_or_64_or_128_t<Int>>(value);
@ -1486,22 +1487,23 @@ template <typename Range> class basic_writer {
}
// The handle_int_type_spec handler that writes an integer.
template <typename Int, typename Specs> struct int_writer {
using unsigned_type = uint32_or_64_or_128_t<Int>;
template <typename UInt> struct int_writer {
basic_writer<Range>& writer;
const Specs& specs;
unsigned_type abs_value;
const basic_format_specs<char_type>& specs;
UInt abs_value;
char prefix[4];
unsigned prefix_size;
string_view get_prefix() const { return string_view(prefix, prefix_size); }
int_writer(basic_writer<Range>& w, Int value, const Specs& s)
template <typename Int>
int_writer(basic_writer<Range>& w, Int value,
const basic_format_specs<char_type>& s)
: writer(w),
specs(s),
abs_value(static_cast<unsigned_type>(value)),
abs_value(static_cast<UInt>(value)),
prefix_size(0) {
static_assert(std::is_same<uint32_or_64_or_128_t<Int>, UInt>::value, "");
if (is_negative(value)) {
prefix[0] = '-';
++prefix_size;
@ -1512,58 +1514,40 @@ template <typename Range> class basic_writer {
}
}
struct dec_writer {
unsigned_type abs_value;
int num_digits;
template <typename It> void operator()(It&& it) const {
it = internal::format_decimal<char_type>(it, abs_value, num_digits);
}
};
void on_dec() {
int num_digits = count_digits(abs_value);
writer.write_int(num_digits, get_prefix(), specs,
dec_writer{abs_value, num_digits});
auto num_digits = count_digits(abs_value);
writer.out_ = internal::write_int(writer.out_, num_digits, get_prefix(),
specs, [=](reserve_iterator it) {
return format_decimal<char_type>(
it, abs_value, num_digits);
});
}
struct hex_writer {
int_writer& self;
int num_digits;
template <typename It> void operator()(It&& it) const {
it = format_uint<4, char_type>(it, self.abs_value, num_digits,
self.specs.type != 'x');
}
};
void on_hex() {
if (specs.alt) {
prefix[prefix_size++] = '0';
prefix[prefix_size++] = specs.type;
}
int num_digits = count_digits<4>(abs_value);
writer.write_int(num_digits, get_prefix(), specs,
hex_writer{*this, num_digits});
writer.out_ = internal::write_int(writer.out_, num_digits, get_prefix(),
specs, [=](reserve_iterator it) {
return format_uint<4, char_type>(
it, abs_value, num_digits,
specs.type != 'x');
});
}
template <int BITS> struct bin_writer {
unsigned_type abs_value;
int num_digits;
template <typename It> void operator()(It&& it) const {
it = format_uint<BITS, char_type>(it, abs_value, num_digits);
}
};
void on_bin() {
if (specs.alt) {
prefix[prefix_size++] = '0';
prefix[prefix_size++] = static_cast<char>(specs.type);
}
int num_digits = count_digits<1>(abs_value);
writer.write_int(num_digits, get_prefix(), specs,
bin_writer<1>{abs_value, num_digits});
writer.out_ = internal::write_int(writer.out_, num_digits, get_prefix(),
specs, [=](reserve_iterator it) {
return format_uint<1, char_type>(
it, abs_value, num_digits);
});
}
void on_oct() {
@ -1573,25 +1557,28 @@ template <typename Range> class basic_writer {
// is not greater than the number of digits.
prefix[prefix_size++] = '0';
}
writer.write_int(num_digits, get_prefix(), specs,
bin_writer<3>{abs_value, num_digits});
writer.out_ = internal::write_int(writer.out_, num_digits, get_prefix(),
specs, [=](reserve_iterator it) {
return format_uint<3, char_type>(
it, abs_value, num_digits);
});
}
enum { sep_size = 1 };
struct num_writer {
unsigned_type abs_value;
UInt abs_value;
int size;
const std::string& groups;
char_type sep;
template <typename It> void operator()(It&& it) const {
template <typename It> It operator()(It it) const {
basic_string_view<char_type> s(&sep, sep_size);
// Index of a decimal digit with the least significant digit having
// index 0.
int digit_index = 0;
std::string::const_iterator group = groups.cbegin();
it = format_decimal<char_type>(
return format_decimal<char_type>(
it, abs_value, size,
[this, s, &group, &digit_index](char_type*& buffer) {
if (*group <= 0 || ++digit_index % *group != 0 ||
@ -1624,8 +1611,9 @@ template <typename Range> class basic_writer {
}
if (group == groups.cend())
size += sep_size * ((num_digits - 1) / groups.back());
writer.write_int(size, get_prefix(), specs,
num_writer{abs_value, size, groups, sep});
writer.out_ =
internal::write_int(writer.out_, size, get_prefix(), specs,
num_writer{abs_value, size, groups, sep});
}
FMT_NORETURN void on_error() {
@ -1655,9 +1643,9 @@ template <typename Range> class basic_writer {
void write(uint128_t value) { write_decimal(value); }
#endif
template <typename T, typename Spec>
void write_int(T value, const Spec& spec) {
handle_int_type_spec(spec.type, int_writer<T, Spec>(*this, value, spec));
template <typename T> void write_int(T value, const format_specs& spec) {
using uint_type = uint32_or_64_or_128_t<T>;
handle_int_type_spec(spec.type, int_writer<uint_type>(*this, value, spec));
}
template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>