MeasureStandardPrefix(string abbreviation, string name, int eBase, int exp)
{
Abbreviation = abbreviation;
Name = name;
Base = eBase;
Exponent = exp;
Factor = eBase == 2 ? new ExpFactor(exp, 0) : new ExpFactor(0, exp);
}
public Combinator(IEnumerable <ExponentMeasureUnit> units)
{
_normM = new List <AtomicMeasureUnit>();
_normE = new List <int>();
_dimensionLessFactor = ExpFactor.Neutral;
if (units != null)
{
Add(units);
}
}
ExponentMeasureUnit CreateExponentPrefixed(int exp, ExpFactor adjustment, AtomicMeasureUnit atomic)
{
ExponentMeasureUnit u;
if (!adjustment.IsNeutral)
{
var best = MeasureStandardPrefix.FindBest(adjustment, atomic.AutoStandardPrefix);
atomic = RegisterPrefixed(best.Adjustment, best.Prefix, atomic);
}
u = RegisterExponent(exp, atomic);
return(u);
}
ExpFactor ParseFactor(string s, ExpFactor f)
{
if (s[0] == '2')
{
f = f.Multiply(new ExpFactor(Int16.Parse(s.Substring(2)), 0));
}
else
{
f = f.Multiply(new ExpFactor(0, Int16.Parse(s.Substring(3))));
}
return(f);
}
/// <summary>
/// The isNormalized is nullable: when automatically creating PrefixedUnit this is null and:
/// - if the unit must be created it won't be the normalized one.
/// - if the unit is found, we don't check the potential race condition.
/// Only when explicitly registering/creating the unit with true or false, the resulting unit IsNormalized
/// property is checked to prevent race conditions.
/// </summary>
internal PrefixedMeasureUnit RegisterPrefixed(ExpFactor adjustment, MeasureStandardPrefix p, AtomicMeasureUnit u, bool?isNormalized = null)
{
var names = PrefixedMeasureUnit.ComputeNames(adjustment, p, u);
return(Register(names.A, names.N, () => new PrefixedMeasureUnit(this, names, adjustment, p, u, isNormalized ?? false), m =>
{
if (isNormalized.HasValue && m.IsNormalized != isNormalized)
{
ThrowArgumentException(m, $"new IsNormalized '{isNormalized}' differ from '{m.IsNormalized}'.");
}
}));
}
public void Add(AtomicMeasureUnit u, int exp)
{
if (u.AtomicMeasureUnit.Normalization == None)
{
var fp = u.AtomicMeasureUnit.NormalizationFactor.ExpFactor.Power(exp);
_dimensionLessFactor = _dimensionLessFactor.Multiply(fp);
}
else
{
for (int i = 0; i < _normM.Count; ++i)
{
if (_normM[i] == u)
{
_normE[i] += exp;
return;
}
}
_normM.Add(u);
_normE.Add(exp);
}
}
bool TryParseExponent(Match match, out ExponentMeasureUnit u, bool skipFirstLookup = false)
{
if (!skipFirstLookup && TryGetExistingExponent(match.ToString(), out u))
{
return(true);
}
u = null;
// Handling dimensionless unit.
var factor = match.Groups[4].Value;
if (factor.Length > 0)
{
var f = ParseFactor(factor, ExpFactor.Neutral);
u = RegisterPrefixed(f, MeasureStandardPrefix.None, MeasureUnit.None);
return(true);
}
string sExp = match.Groups[3].Value;
int exp = sExp.Length > 0 ? Int32.Parse(sExp) : 1;
if (exp == 0)
{
u = MeasureUnit.None;
return(true);
}
string withoutExp = match.Groups[1].Value + match.Groups[2].Value;
if (_allUnits.TryGetValue(withoutExp, out var unit))
{
if (exp == 1 && unit is ExponentMeasureUnit direct)
{
u = direct;
return(true);
}
if (!(unit is AtomicMeasureUnit atomic))
{
return(false);
}
u = RegisterExponent(exp, atomic);
return(true);
}
ExpFactor adjustment = ExpFactor.Neutral;
foreach (Capture f in match.Groups[1].Captures)
{
adjustment = ParseFactor(f.Value, adjustment);
}
string withoutAdjustment = match.Groups[2].Value;
if (_allUnits.TryGetValue(withoutAdjustment, out unit))
{
if (!(unit is AtomicMeasureUnit basic))
{
return(false);
}
if (basic is PrefixedMeasureUnit prefix)
{
adjustment = adjustment.Multiply(prefix.AdjustmentFactor).Multiply(prefix.Prefix.Factor);
basic = prefix.AtomicMeasureUnit;
}
u = CreateExponentPrefixed(exp, adjustment, basic);
return(true);
}
var p = MeasureStandardPrefix.FindPrefix(withoutAdjustment);
if (p == MeasureStandardPrefix.None)
{
return(false);
}
withoutAdjustment = withoutAdjustment.Substring(p.Abbreviation.Length);
if (withoutAdjustment.Length == 0)
{
return(false);
}
if (_allUnits.TryGetValue(withoutAdjustment, out unit))
{
if (!(unit is AtomicMeasureUnit basic))
{
return(false);
}
if (basic is PrefixedMeasureUnit prefix)
{
return(false);
}
adjustment = adjustment.Multiply(p.Factor);
u = CreateExponentPrefixed(exp, adjustment, basic);
return(true);
}
return(false);
}
/// <summary>
/// Initializes a new <see cref="FullFactor"/> with a <see cref="Factor"/> = 1.0.
/// </summary>
/// <param name="f">The exponent factor.</param>
public FullFactor(ExpFactor f)
: this(1.0, f)
{
}
/// <summary>
/// Initializes a new <see cref="FullFactor"/>.
/// </summary>
/// <param name="f">The factor.</param>
/// <param name="e">The exponent factor.</param>
public FullFactor(double f, ExpFactor e)
{
Factor = f;
ExpFactor = e;
}
/// <summary>
/// Finds the best prefix given a <see cref="ExpFactor"/>.
/// If both metric and binary exponents exist (ie. are not zero), the metric prefix
/// is selected (the Exp2 is injected in the adjustment factor).
/// </summary>
/// <param name="newExp">Must not be the neutral factor.</param>
/// <param name="stdPrefix">
/// Whether the actual standard prefixes are allowed. When not, it is the adjustemnt factor
/// that handles the exponent and the prefix None is used.
/// </param>
/// <returns>The best prefix with the required adjustment factor.</returns>
internal static (ExpFactor Adjustment, MeasureStandardPrefix Prefix) FindBest(ExpFactor newExp, AutoStandardPrefix stdPrefix)
{
// Privilegiates metric prefix if any and if metric is allowed.
Debug.Assert(!newExp.IsNeutral);
if (newExp.Exp10 != 0 && (stdPrefix & AutoStandardPrefix.Metric) != 0)
{
var b10 = FindBest(newExp.Exp10, _allMetricIndex, _allMetric);
return(new ExpFactor(newExp.Exp2, b10.Item1), b10.Item2);
}
if (newExp.Exp2 != 0 && (stdPrefix & AutoStandardPrefix.Binary) != 0)
{
Debug.Assert(newExp.Exp2 != 0);
var b2 = FindBest(newExp.Exp2, _allBinaryIndex, _allBinary);
return(new ExpFactor(b2.Item1, 0), b2.Item2);
}
return(newExp, None);
}
/// <summary> /// <see cref="Factor"/> must be 1.0 and then <see cref="ExpFactor"/> must be equal to <paramref name="other"/>. /// </summary> /// <param name="other">The other factor.</param> /// <returns>True if factor is 1.0 ExpFactor equals other. False otherwise.</returns> public bool Equals(ExpFactor other) => Factor == 1.0 && ExpFactor.Equals(other);
/// <summary>
/// The isNormalized is nullable: when automatically creating PrefixedUnit this is null and :
/// - if the unit must be created it won't be the normalized one.
/// - if the unit is found, we don't check the potential race condition.
/// Only when explicitly registering/creating the unit with true or false, the resulting unit IsNormalized
/// property is checked to prevent race conditions.
/// </summary>
internal PrefixedMeasureUnit RegisterPrefixed(ExpFactor adjustment, MeasureStandardPrefix p, AtomicMeasureUnit u, bool?isNormalized = null)
{
var names = PrefixedMeasureUnit.ComputeNames(adjustment, p, u);
return(Register(names.A, names.N, () => new PrefixedMeasureUnit(this, names, adjustment, p, u, isNormalized ?? false), m => !isNormalized.HasValue || m.IsNormalized == isNormalized));
}
