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Don't override fixed formatting depending on exponent (#1072)

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This commit is contained in:
Victor Zverovich 2019-03-09 11:11:15 -08:00
parent 93d22dec35
commit 3466d9c845
1 changed files with 9 additions and 3 deletions
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12
include/fmt/format.h
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@ -1182,7 +1182,6 @@ It grisu2_prettify(const char* digits, int size, int exp, It it,
gen_digits_params params) {
// pow(10, full_exp - 1) <= v <= pow(10, full_exp).
int full_exp = size + exp;
params.fixed = (full_exp - 1) >= -4 && (full_exp - 1) <= 10;
if (!params.fixed) {
// Insert a decimal point after the first digit and add an exponent.
*it++ = static_cast<Char>(*digits);
@ -1222,7 +1221,10 @@ It grisu2_prettify(const char* digits, int size, int exp, It it,
// 1234e-6 -> 0.001234
*it++ = static_cast<Char>('0');
*it++ = static_cast<Char>('.');
it = std::fill_n(it, -full_exp, static_cast<Char>('0'));
int num_zeros = -full_exp;
if (params.num_digits >= 0 && params.num_digits < num_zeros)
num_zeros = params.num_digits;
it = std::fill_n(it, num_zeros, static_cast<Char>('0'));
it = copy_str<Char>(digits, digits + size, it);
}
return it;
@ -2688,6 +2690,8 @@ template <typename Range> class basic_writer {
const internal::gen_digits_params& params)
: digits_(digits), sign_(sign), exp_(exp), params_(params) {
int num_digits = static_cast<int>(digits.size());
int full_exp = num_digits + exp;
params_.fixed |= (full_exp - 1) >= -4 && (full_exp - 1) <= 10;
auto it = internal::grisu2_prettify<char>(
digits.data(), num_digits, exp, internal::counting_iterator<char>(),
params_);
@ -2888,7 +2892,7 @@ void basic_writer<Range>::write_double(T value, const format_specs& spec) {
int exp = 0;
int precision = spec.has_precision() || !spec.type ? spec.precision : 6;
bool use_grisu = fmt::internal::use_grisu<T>() &&
(!spec.type || handler.fixed) &&
!spec.type &&
internal::grisu2_format(static_cast<double>(value), buffer,
precision, handler.fixed, exp);
if (!use_grisu) internal::sprintf_format(value, buffer, spec);
@ -2911,6 +2915,8 @@ void basic_writer<Range>::write_double(T value, const format_specs& spec) {
}
if (use_grisu) {
auto params = internal::gen_digits_params();
params.fixed = handler.fixed;
params.num_digits = precision;
if (precision != 0) params.trailing_zeros = true;
write_padded(as, grisu_writer{sign, buffer, exp, params});
} else {