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Replace bool with float_format and add exponential

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This commit is contained in:
Victor Zverovich 2019-11-17 14:17:50 -08:00
parent f26446290b
commit ed117baa4f
1 changed files with 25 additions and 11 deletions
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36
include/fmt/format.h
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@ -91,7 +91,7 @@ FMT_END_NAMESPACE
# define FMT_THROW(x) \
do { \
static_cast<void>(sizeof(x)); \
FMT_ASSERT(false, ""); \
FMT_ASSERT(false, ""); \
} while (false)
# endif
#endif
@ -1051,10 +1051,17 @@ using format_specs = basic_format_specs<char>;
namespace internal {
// A floating-point presentation format.
enum class float_format {
general, // General: shortest of exponential and fixed.
exp, // Exponential: 1e42
fixed // Fixed: 1.42
};
struct gen_digits_params {
int num_digits;
sign_t sign : 3;
bool fixed;
float_format format;
bool upper;
bool trailing_zeros;
};
@ -1091,7 +1098,7 @@ template <typename Char> class grisu_writer {
template <typename It> It grisu_prettify(It it) const {
// pow(10, full_exp - 1) <= v <= pow(10, full_exp).
int full_exp = num_digits_ + exp_;
if (!params_.fixed) {
if (params_.format == float_format::exp) {
// Insert a decimal point after the first digit and add an exponent.
*it++ = static_cast<Char>(*digits_);
if (num_digits_ > 1) *it++ = decimal_point_;
@ -1158,7 +1165,11 @@ template <typename Char> class grisu_writer {
decimal_point_(decimal_point) {
int full_exp = num_digits + exp - 1;
int precision = params.num_digits > 0 ? params.num_digits : 16;
params_.fixed |= full_exp >= -4 && full_exp < precision;
if (params_.format == float_format::general) {
params_.format = full_exp >= -4 && full_exp < precision
? float_format::fixed
: float_format::exp;
}
size_ = grisu_prettify(counting_iterator()).count();
size_ += params_.sign ? 1 : 0;
}
@ -1331,14 +1342,14 @@ class float_type_checker : private ErrorHandler {
struct float_spec_handler {
char type;
bool upper;
bool fixed;
float_format format;
bool as_percentage;
bool use_locale;
explicit float_spec_handler(char t)
: type(t),
upper(false),
fixed(false),
format(float_format::general),
as_percentage(false),
use_locale(false) {}
@ -1347,16 +1358,17 @@ struct float_spec_handler {
}
void on_exp() {
format = float_format::exp;
if (type == 'E') upper = true;
}
void on_fixed() {
fixed = true;
format = float_format::fixed;
if (type == 'F') upper = true;
}
void on_percent() {
fixed = true;
format = float_format::fixed;
as_percentage = true;
}
@ -2849,7 +2861,7 @@ void internal::basic_writer<Range>::write_fp(T value,
int exp = 0;
int precision = specs.precision >= 0 || !specs.type ? specs.precision : 6;
unsigned options = 0;
if (handler.fixed) options |= grisu_options::fixed;
if (handler.format == float_format::fixed) options |= grisu_options::fixed;
if (const_check(sizeof(value) == sizeof(float)))
options |= grisu_options::binary32;
bool use_grisu =
@ -2882,10 +2894,12 @@ void internal::basic_writer<Range>::write_fp(T value,
if (use_grisu) {
auto params = gen_digits_params();
params.sign = sign;
params.fixed = handler.fixed;
params.format = handler.format;
params.num_digits = precision;
params.trailing_zeros =
(precision != 0 && (handler.fixed || !specs.type)) || specs.alt;
(precision != 0 &&
(handler.format == float_format::fixed || !specs.type)) ||
specs.alt;
int num_digits = static_cast<int>(buffer.size());
write_padded(as, grisu_writer<char_type>(buffer.data(), num_digits, exp,
params, decimal_point));