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std.format: Add formatting integers with %e, %f, %g and %a.

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This commit is contained in:
berni44 2021-04-19 20:36:10 +02:00
parent edb1237abc
commit ad5247072f
2 changed files with 127 additions and 18 deletions
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143
std/format/internal/write.d
View file

@ -174,10 +174,12 @@ if (is(IntegralTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
} }
immutable uint base = immutable uint base =
f.spec == 'x' || f.spec == 'X' ? 16 : f.spec == 'x' || f.spec == 'X' || f.spec == 'a' || f.spec == 'A' ? 16 :
f.spec == 'o' ? 8 : f.spec == 'o' ? 8 :
f.spec == 'b' ? 2 : f.spec == 'b' ? 2 :
f.spec == 's' || f.spec == 'd' || f.spec == 'u' ? 10 : f.spec == 's' || f.spec == 'd' || f.spec == 'u'
|| f.spec == 'e' || f.spec == 'E' || f.spec == 'f' || f.spec == 'F'
|| f.spec == 'g' || f.spec == 'G' ? 10 :
0; 0;
import std.format : enforceFmt; import std.format : enforceFmt;
@ -190,7 +192,7 @@ if (is(IntegralTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
ulong arg = val; ulong arg = val;
static if (isSigned!U) static if (isSigned!U)
{ {
if (f.spec == 's' || f.spec == 'd') if (f.spec != 'x' && f.spec != 'X' && f.spec != 'b' && f.spec != 'o' && f.spec != 'u')
{ {
if (val < 0) if (val < 0)
{ {
@ -208,7 +210,7 @@ if (is(IntegralTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{ {
digits[pos--] = '0' + arg % base; digits[pos--] = '0' + arg % base;
if (base > 10 && digits[pos + 1] > '9') if (base > 10 && digits[pos + 1] > '9')
digits[pos + 1] += (f.spec == 'x' ? 'a' : 'A') - '0' - 10; digits[pos + 1] += ((f.spec == 'x' || f.spec == 'a') ? 'a' : 'A') - '0' - 10;
arg /= base; arg /= base;
} while (arg > 0); } while (arg > 0);
@ -216,25 +218,132 @@ if (is(IntegralTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
size_t left = 2; size_t left = 2;
size_t right = 2; size_t right = 2;
if (negative) // add sign
prefix[right++] = '-'; if (f.spec != 'x' && f.spec != 'X' && f.spec != 'b' && f.spec != 'o' && f.spec != 'u')
else if (f.spec == 's' || f.spec == 'd')
{ {
if (f.flPlus) if (negative)
prefix[right++] = '-';
else if (f.flPlus)
prefix[right++] = '+'; prefix[right++] = '+';
else if (f.flSpace) else if (f.flSpace)
prefix[right++] = ' '; prefix[right++] = ' ';
} }
if (f.flHash && (base == 16) && obj != 0)
{
prefix[--left] = f.spec;
prefix[--left] = '0';
}
if (f.flHash && (base == 8) && obj != 0
&& (digits.length - (pos + 1) >= f.precision || f.precision == f.UNSPECIFIED))
prefix[--left] = '0';
writeAligned(w, prefix[left .. right], digits[pos + 1 .. $], "", f, true); // not a floating point like spec
if (f.spec == 'x' || f.spec == 'X' || f.spec == 'b' || f.spec == 'o' || f.spec == 'u'
|| f.spec == 'd' || f.spec == 's')
{
if (f.flHash && (base == 16) && obj != 0)
{
prefix[--left] = f.spec;
prefix[--left] = '0';
}
if (f.flHash && (base == 8) && obj != 0
&& (digits.length - (pos + 1) >= f.precision || f.precision == f.UNSPECIFIED))
prefix[--left] = '0';
writeAligned(w, prefix[left .. right], digits[pos + 1 .. $], "", f, true);
return;
}
FormatSpec!Char fs = f;
if (f.precision == f.UNSPECIFIED)
fs.precision = cast(typeof(fs.precision)) (digits.length - pos - 2);
// %f like output
if (f.spec == 'f' || f.spec == 'F'
|| ((f.spec == 'g' || f.spec == 'G') && (fs.precision >= digits.length - pos - 2)))
{
if (f.precision == f.UNSPECIFIED)
fs.precision = 0;
writeAligned(w, prefix[left .. right], digits[pos + 1 .. $], ".", "", fs,
(f.spec == 'g' || f.spec == 'G') ? PrecisionType.allDigits : PrecisionType.fractionalDigits);
return;
}
import std.algorithm.searching : all;
// at least one digit for %g
if ((f.spec == 'g' || f.spec == 'G') && fs.precision == 0)
fs.precision = 1;
// rounding
size_t digit_end = pos + fs.precision + ((f.spec == 'g' || f.spec == 'G') ? 1 : 2);
if (digit_end <= digits.length)
{
RoundingClass rt = RoundingClass.ZERO;
if (digit_end < digits.length)
{
auto tie = (f.spec == 'a' || f.spec == 'A') ? '8' : '5';
if (digits[digit_end] >= tie)
{
rt = RoundingClass.UPPER;
if (digits[digit_end] == tie && digits[digit_end + 1 .. $].all!(a => a == '0'))
rt = RoundingClass.FIVE;
}
else
{
rt = RoundingClass.LOWER;
if (digits[digit_end .. $].all!(a => a == '0'))
rt = RoundingClass.ZERO;
}
}
if (round(digits, pos + 1, digit_end, rt, negative,
f.spec == 'a' ? 'f' : (f.spec == 'A' ? 'F' : '9')))
{
pos--;
digit_end--;
}
}
// convert to scientific notation
char[1] int_digit = void;
int_digit[0] = digits[pos + 1];
digits[pos + 1] = '.';
char[4] suffix = void;
if (f.spec == 'e' || f.spec == 'E' || f.spec == 'g' || f.spec == 'G')
{
suffix[0] = (f.spec == 'e' || f.spec == 'g') ? 'e' : 'E';
suffix[1] = '+';
suffix[2] = cast(char) ('0' + (digits.length - pos - 2) / 10);
suffix[3] = cast(char) ('0' + (digits.length - pos - 2) % 10);
}
else
{
if (right == 3)
prefix[0] = prefix[2];
prefix[1] = '0';
prefix[2] = f.spec == 'a' ? 'x' : 'X';
left = right == 3 ? 0 : 1;
right = 3;
suffix[0] = f.spec == 'a' ? 'p' : 'P';
suffix[1] = '+';
suffix[2] = cast(char) ('0' + ((digits.length - pos - 2) * 4) / 10);
suffix[3] = cast(char) ('0' + ((digits.length - pos - 2) * 4) % 10);
}
import std.algorithm.comparison : min;
// remove trailing zeros
if ((f.spec == 'g' || f.spec == 'G') && !f.flHash)
{
digit_end = min(digit_end, digits.length);
while (digit_end > pos + 1 &&
(digits[digit_end - 1] == '0' || digits[digit_end - 1] == '.'))
digit_end--;
}
writeAligned(w, prefix[left .. right], int_digit[0 .. $],
digits[pos + 1 .. min(digit_end, $)],
suffix[0 .. $], fs,
(f.spec == 'g' || f.spec == 'G') ? PrecisionType.allDigits : PrecisionType.fractionalDigits);
} }
// https://issues.dlang.org/show_bug.cgi?id=18838 // https://issues.dlang.org/show_bug.cgi?id=18838

2
std/uni/package.d
View file

@ -2490,7 +2490,7 @@ public:
{ {
import std.exception : assertThrown; import std.exception : assertThrown;
import std.format : format, FormatException; import std.format : format, FormatException;
assertThrown!FormatException(format("%a", unicode.ASCII)); assertThrown!FormatException(format("%z", unicode.ASCII));
} }