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format.conv.number2String -> format.integral2String (intern)

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This commit is contained in:
Eugen Wissner 2017-11-12 11:57:47 +01:00
parent 4bbc8b510a
commit 7797f0a1fe
2 changed files with 79 additions and 79 deletions
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78
source/tanya/format/conv.d
View File

@ -355,81 +355,3 @@ if (isIntegral!From && is(To == enum))
throw make!ConvException(defaultAllocator,
"Value not found in enum '" ~ To.stringof ~ "'");
}
// Returns the last part of buffer with converted number.
package(tanya) char[] number2String(T)(const T number,
return ref char[21] buffer)
if (isIntegral!T)
{
// abs the integer.
ulong n64 = number < 0 ? -cast(long) number : number;
char* start = buffer[].ptr + buffer.sizeof - 1;
while (true)
{
// Do in 32-bit chunks (avoid lots of 64-bit divides even with constant
// denominators).
char* o = start - 8;
uint n;
if (n64 >= 100000000)
{
n = n64 % 100000000;
n64 /= 100000000;
}
else
{
n = cast(uint) n64;
n64 = 0;
}
while (n)
{
*--start = cast(char) (n % 10) + '0';
n /= 10;
}
// Ignore the leading zero if it was the last part of the integer.
if (n64 == 0)
{
if ((start[0] == '0')
&& (start != (buffer[].ptr + buffer.sizeof -1)))
{
++start;
}
break;
}
// Copy leading zeros if it wasn't the most significant part of the
// integer.
while (start != o)
{
*--start = '0';
}
}
// Get the length that we have copied.
uint l = cast(uint) ((buffer[].ptr + buffer.sizeof - 1) - start);
if (l == 0)
{
*--start = '0';
l = 1;
}
else if (number < 0) // Set the sign.
{
*--start = '-';
++l;
}
return buffer[$ - l - 1 .. $ - 1];
}
// Converting an integer to string.
@nogc nothrow pure @system unittest
{
char[21] buf;
assert(number2String(80, buf) == "80");
assert(number2String(-80, buf) == "-80");
assert(number2String(0, buf) == "0");
assert(number2String(uint.max, buf) == "4294967295");
assert(number2String(int.min, buf) == "-2147483648");
}

78
source/tanya/format/package.d
View File

@ -15,3 +15,81 @@
module tanya.format;
public import tanya.format.conv;
import tanya.meta.trait;
// Returns the last part of buffer with converted number.
package(tanya) char[] integral2String(T)(T number, return ref char[21] buffer)
if (isIntegral!T)
{
// abs the integer.
ulong n64 = number < 0 ? -cast(long) number : number;
char* start = buffer[].ptr + buffer.sizeof - 1;
while (true)
{
// Do in 32-bit chunks (avoid lots of 64-bit divides even with constant
// denominators).
char* o = start - 8;
uint n;
if (n64 >= 100000000)
{
n = n64 % 100000000;
n64 /= 100000000;
}
else
{
n = cast(uint) n64;
n64 = 0;
}
while (n)
{
*--start = cast(char) (n % 10) + '0';
n /= 10;
}
// Ignore the leading zero if it was the last part of the integer.
if (n64 == 0)
{
if ((start[0] == '0')
&& (start != (buffer[].ptr + buffer.sizeof -1)))
{
++start;
}
break;
}
// Copy leading zeros if it wasn't the most significant part of the
// integer.
while (start != o)
{
*--start = '0';
}
}
// Get the length that we have copied.
uint l = cast(uint) ((buffer[].ptr + buffer.sizeof - 1) - start);
if (l == 0)
{
*--start = '0';
l = 1;
}
else if (number < 0) // Set the sign.
{
*--start = '-';
++l;
}
return buffer[$ - l - 1 .. $ - 1];
}
// Converting an integer to string.
@nogc nothrow pure @system unittest
{
char[21] buf;
assert(integral2String(80, buf) == "80");
assert(integral2String(-80, buf) == "-80");
assert(integral2String(0, buf) == "0");
assert(integral2String(uint.max, buf) == "4294967295");
assert(integral2String(int.min, buf) == "-2147483648");
}