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HumanReadableNumber(): Simplify output for simple numbers. Examples: (#291)

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* HumanReadableNumber(): Simplify output for simple numbers. Examples:

HumanReadableNumber(    0.0)=      0    ---->         0
HumanReadableNumber(    0.5)=   512m    ---->       0.5
HumanReadableNumber(    0.9)= 921.6m    ---->       0.9
HumanReadableNumber(    1.0)=  1024m    ---->         1
HumanReadableNumber(   1.05)=1075.2m    ---->      1.05
HumanReadableNumber(    1.1)=    1.1    ---->       1.1
HumanReadableNumber(    1.2)=    1.2    ---->       1.2
HumanReadableNumber( 0.0e-1)=      0    ---->         0
HumanReadableNumber( 0.5e-1)=  51.2m    ---->      0.05
HumanReadableNumber( 0.9e-1)= 92.16m    ---->      0.09
HumanReadableNumber( 1.0e-1)= 102.4m    ---->       0.1
HumanReadableNumber(1.05e-1)=107.52m    ---->     0.105
HumanReadableNumber( 1.1e-1)=112.64m    ---->      0.11
HumanReadableNumber( 1.2e-1)=122.88m    ---->      0.12
HumanReadableNumber( 0.0e-3)=      0    ---->         0
HumanReadableNumber( 0.5e-3)=524.288u   ---->   524.288u
HumanReadableNumber( 0.9e-3)=943.718u   ---->   943.718u
HumanReadableNumber( 1.0e-3)=1048.58u   ---->   1048.58u
HumanReadableNumber(1.05e-3)=  1101u    ---->   0.00105
HumanReadableNumber( 1.1e-3)=1.1264m    ---->    0.0011
HumanReadableNumber( 1.2e-3)=1.2288m    ---->    0.0012

* HumanReadableNumber(): change simple printing threshold to 0.01.

* ToExponentAndMantissa(): refactor branch sequence.
This commit is contained in:
jpmag 2017-01-13 22:19:42 +00:00 committed by Dominic Hamon
parent 34010beecb
commit b4fdf6e9df
1 changed files with 12 additions and 8 deletions
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20
src/string_util.cc
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@ -45,6 +45,8 @@ void ToExponentAndMantissa(double val, double thresh, int precision,
std::max(thresh, 1.0 / std::pow(10.0, precision));
const double big_threshold = adjusted_threshold * one_k;
const double small_threshold = adjusted_threshold;
// Values in ]simple_threshold,small_threshold[ will be printed as-is
const double simple_threshold = 0.01;
if (val > big_threshold) {
// Positive powers
@ -62,14 +64,16 @@ void ToExponentAndMantissa(double val, double thresh, int precision,
*exponent = 0;
} else if (val < small_threshold) {
// Negative powers
double scaled = val;
for (size_t i = 0; i < arraysize(kSmallSIUnits); ++i) {
scaled *= one_k;
if (scaled >= small_threshold) {
mantissa_stream << scaled;
*exponent = -static_cast<int64_t>(i + 1);
*mantissa = mantissa_stream.str();
return;
if (val < simple_threshold) {
double scaled = val;
for (size_t i = 0; i < arraysize(kSmallSIUnits); ++i) {
scaled *= one_k;
if (scaled >= small_threshold) {
mantissa_stream << scaled;
*exponent = -static_cast<int64_t>(i + 1);
*mantissa = mantissa_stream.str();
return;
}
}
}
mantissa_stream << val;