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Improvements to Number parsing

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This commit is contained in:
disarray2077 2023-05-14 16:54:26 -03:00
parent 4c65652955
commit 5d28f8e1f0
10 changed files with 418 additions and 90 deletions
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77
BeefLibs/corlib/src/Int8.bf
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@ -1,10 +1,20 @@
using System.Globalization;
namespace System
{
#unwarn
struct Int8 : int8, IInteger, ISigned, IHashable, IFormattable, IIsNaN
{
public const int32 MaxValue = 0x7F;
public const int32 MinValue = -0x80;
public enum ParseError
{
case Ok;
case NoValue;
case Overflow;
case InvalidChar(int8 partialResult);
}
public const int8 MaxValue = 0x7F;
public const int8 MinValue = -0x80;
public static int operator<=>(Self a, Self b)
{
@ -66,5 +76,68 @@ namespace System
NumberFormatter.NumberToString(format, (int32)this, formatProvider, outString);
}
}
public static Result<int8, ParseError> Parse(StringView val, NumberStyles style = .Number, CultureInfo cultureInfo = null)
{
if (val.IsEmpty)
return .Err(.NoValue);
bool isNeg = false;
int8 result = 0;
int8 radix = style.HasFlag(.AllowHexSpecifier) ? 0x10 : 10;
for (int32 i = 0; i < val.Length; i++)
{
char8 c = val[i];
if ((i == 0) && (c == '-'))
{
isNeg = true;
continue;
}
if ((c >= '0') && (c <= '9'))
{
result &*= radix;
result &+= (int8)(c - '0');
}
else if ((c >= 'a') && (c <= 'f'))
{
if (radix != 0x10)
return .Err(.InvalidChar(result));
result &*= radix;
result &+= (int8)(c - 'a' + 10);
}
else if ((c >= 'A') && (c <= 'F'))
{
if (radix != 0x10)
return .Err(.InvalidChar(result));
result &*= radix;
result &+= (int8)(c - 'A' + 10);
}
else if ((c == 'X') || (c == 'x'))
{
if ((!style.HasFlag(.AllowHexSpecifier)) || (i == 0) || (result != 0))
return .Err(.InvalidChar(result));
radix = 0x10;
}
else if (c == '\'')
{
// Ignore
}
else if ((c == '+') && (i == 0))
{
// Ignore
}
else
return .Err(.InvalidChar(result));
if (isNeg ? (uint8)result > (uint8)MaxValue + 1 : (uint8)result > (uint8)MaxValue)
return .Err(.Overflow);
}
return isNeg ? -result : result;
}
}
}