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Reduce cyclomatic complexity of Coordinates.Serialization

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Again just... all of it
This commit is contained in:
Oliver Booth 2022-11-30 20:15:19 +00:00
parent 2fe3c8b98e
commit dc6120af43
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GPG Key ID: 32A00B35503AF634
1 changed files with 145 additions and 68 deletions
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213
VpSharp/src/Coordinates.Serialization.cs
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@ -99,7 +99,7 @@ public readonly partial struct Coordinates
public static Coordinates Deserialize(ReadOnlySpan<char> value)
{
using Utf8ValueStringBuilder builder = ZString.CreateUtf8StringBuilder();
Utf8ValueStringBuilder builder = ZString.CreateUtf8StringBuilder();
string? world = null;
var isRelative = false;
double x = 0.0, y = 0.0, z = 0.0, yaw = 0.0;
@ -119,7 +119,7 @@ public readonly partial struct Coordinates
builder.Append(current);
}
ProcessBuffer();
ProcessBuffer(ref builder, ref world, word, ref isRelative, ref z, ref x, ref y, ref yaw);
word++;
}
@ -131,73 +131,8 @@ public readonly partial struct Coordinates
}
}
builder.Dispose();
return new Coordinates(world, x, y, z, yaw, isRelative);
void ProcessBuffer()
{
ReadOnlySpan<byte> bytes = builder.AsSpan();
Span<char> chars = stackalloc char[bytes.Length];
Encoding.UTF8.GetChars(bytes, chars);
bool hasWorld = !string.IsNullOrWhiteSpace(world);
if (word == 0 && !IsUnitString(bytes))
{
world = chars.ToString().AsNullIfWhiteSpace();
}
else if (IsRelativeUnit(bytes))
{
isRelative = true;
switch (word)
{
case 0 when !hasWorld:
case 1 when hasWorld:
double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out z);
break;
case 1 when !hasWorld:
case 2 when hasWorld:
double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out x);
break;
case 2 when !hasWorld:
case 3 when hasWorld:
double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out y);
break;
case 3 when !hasWorld:
case 4 when hasWorld:
double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out yaw);
break;
}
}
else
{
if (((!hasWorld && word == 1) || (hasWorld && word == 2)) && chars[^1] is 'x' or 'X' or 'w' or 'W')
{
_ = double.TryParse(chars[..^1], NumberStyles.Float, CultureInfo.InvariantCulture, out x);
}
else if (((!hasWorld && word == 0) || (hasWorld && word == 1)) && chars[^1] is 'z' or 'Z' or 'n' or 'N')
{
_ = double.TryParse(chars[..^1], NumberStyles.Float, CultureInfo.InvariantCulture, out z);
}
else if (((!hasWorld && word == 1) || (hasWorld && word == 2)) && chars[^1] is 'e' or 'E')
{
_ = double.TryParse(chars[..^1], NumberStyles.Float, CultureInfo.InvariantCulture, out x);
x = -x;
}
else if (((!hasWorld && word == 0) || (hasWorld && word == 1)) && chars[^1] is 's' or 'S')
{
_ = double.TryParse(chars[..^1], NumberStyles.Float, CultureInfo.InvariantCulture, out z);
z = -z;
}
else if (((!hasWorld && word == 2) || (hasWorld && word == 3)) && chars[^1] is 'a' or 'A')
{
_ = double.TryParse(chars[..^1], NumberStyles.Float, CultureInfo.InvariantCulture, out y);
}
else if (((!hasWorld && word == 3) || (hasWorld && word == 4)) && double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out double temp))
{
yaw = temp;
}
}
}
}
/// <summary>
@ -300,5 +235,147 @@ public readonly partial struct Coordinates
// thicc char span
return IsRelativeUnit(chars) || IsAbsoluteUnit(chars);
}
private static bool IsAtWordIndex(int expected, int actual, bool hasWorld)
{
return hasWorld ? actual == expected + 1 : actual == expected;
}
private static void ProcessBuffer(
ref Utf8ValueStringBuilder builder,
ref string? world,
int word,
ref bool isRelative,
ref double z,
ref double x,
ref double y,
ref double yaw
)
{
ReadOnlySpan<byte> bytes = builder.AsSpan();
Span<char> chars = stackalloc char[bytes.Length];
Encoding.UTF8.GetChars(bytes, chars);
bool hasWorld = !string.IsNullOrWhiteSpace(world);
if (word == 0 && !IsUnitString(bytes))
{
world = chars.ToString().AsNullIfWhiteSpace();
}
else if (IsRelativeUnit(bytes))
{
isRelative = true;
ProcessRelativeUnit(word, ref z, ref x, ref y, ref yaw, hasWorld, chars);
}
else
{
ProcessAbsoluteUnit(word, ref z, ref x, ref y, ref yaw, hasWorld, chars);
}
}
private static void ProcessAbsoluteUnit(int word, ref double z, ref double x, ref double y, ref double yaw, bool hasWorld,
Span<char> chars)
{
const StringComparison comparison = StringComparison.OrdinalIgnoreCase;
char lastChar = chars[^1];
bool isAt0 = IsAtWordIndex(0, word, hasWorld);
bool isAt1 = IsAtWordIndex(1, word, hasWorld);
bool isAt2 = IsAtWordIndex(2, word, hasWorld);
bool isAt3 = IsAtWordIndex(3, word, hasWorld);
Span<char> charsExceptLast = chars[..^1];
double.TryParse(charsExceptLast, NumberStyles.Float, CultureInfo.InvariantCulture, out double value);
if (isAt0)
{
if ("nzNZ".AsSpan().Contains(lastChar))
{
z = value;
}
else if ("sS".AsSpan().Contains(lastChar))
{
z = -value;
}
}
else if (isAt1)
{
if ("xwXW".AsSpan().Contains(lastChar))
{
x = value;
}
else if ("eE".AsSpan().Contains(lastChar))
{
x = -value;
}
}
else if (isAt2 && "aA".AsSpan().Contains(lastChar))
{
y = value;
}
else if (isAt3 && double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out value))
{
yaw = value;
}
/*
if (isAt1 && "XW".Contains(lastChar, comparison))
{
x = value;
}
else if (isAt0 && "ZN".Contains(lastChar, comparison))
{
z = value;
}
else if (isAt1 && "E".Contains(lastChar, comparison))
{
x = -value;
}
else if (isAt0 && "S".Contains(lastChar, comparison))
{
z = -value;
}
else if (isAt2 && "A".Contains(lastChar, comparison))
{
y = value;
}
else if (isAt3 && double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out value))
{
yaw = value;
}*/
}
private static void ProcessRelativeUnit(
int word,
ref double z,
ref double x,
ref double y,
ref double yaw,
bool hasWorld,
Span<char> chars
)
{
if (!double.TryParse(chars, NumberStyles.Float, CultureInfo.InvariantCulture, out double value))
{
return;
}
if (IsAtWordIndex(0, word, hasWorld))
{
z = value;
}
else if (IsAtWordIndex(1, word, hasWorld))
{
x = value;
}
else if (IsAtWordIndex(2, word, hasWorld))
{
y = value;
}
else if (IsAtWordIndex(3, word, hasWorld))
{
yaw = value;
}
}
}
}