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Fix overridden abbrev #833

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Fix overridden abbrev #833

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8b01d68
Add failing tests
tmilnthorp Sep 8, 2020
a625c7f
Wrap GetUnitsForAbbreviation in UnitAbbreviationsCache to allow for f…
tmilnthorp Sep 8, 2020
bc5f8c4
Fix whitespace for code consistency
tmilnthorp Sep 8, 2020
5be4cf7
Don't modify default UnitAbbreviationsCache in test
tmilnthorp Sep 9, 2020
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19 changes: 19 additions & 0 deletions UnitsNet.Tests/UnitAbbreviationsCacheTests.cs
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Expand Up @@ -296,6 +296,25 @@ public void MapUnitToDefaultAbbreviation_GivenCustomAbbreviation_SetsAbbreviatio
Assert.Equal("1 m^2", Area.FromSquareMeters(1).ToString(newZealandCulture));
}

[Fact]
public void MapUnitOverrideTest()
{
UnitAbbreviationsCache.Default.MapUnitToDefaultAbbreviation(MassFlowUnit.GramPerSecond, NorwegianCulture, "grams/second");
Assert.Equal(MassFlow.FromPoundsPerSecond(10), Quantity.Parse(NorwegianCulture, typeof(MassFlow), "10 lb/s"));
}

[Fact]
public void MapUnitToDefaultAbbreviation_AddsNewUnitAsAdditionalOverride()
{
var cache = new UnitAbbreviationsCache();
var abbreviationsBefore = cache.GetUnitAbbreviations(MassFlowUnit.GramPerSecond, NorwegianCulture);

cache.MapUnitToDefaultAbbreviation(MassFlowUnit.GramPerSecond, NorwegianCulture, "grams/second");

var abbreviationsAfter = cache.GetUnitAbbreviations(MassFlowUnit.GramPerSecond, NorwegianCulture);
Assert.Equal(abbreviationsBefore.Length + 1, abbreviationsAfter.Length);
}

/// <summary>
/// Convenience method to the proper culture parameter type.
/// </summary>
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34 changes: 29 additions & 5 deletions UnitsNet/CustomCode/UnitAbbreviationsCache.cs
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Expand Up @@ -276,9 +276,11 @@ public string[] GetUnitAbbreviations(Type unitType, int unitValue, IFormatProvid
if(!TryGetUnitValueAbbreviationLookup(unitType, formatProvider, out var lookup))
return formatProvider != FallbackCulture ? GetUnitAbbreviations(unitType, unitValue, FallbackCulture) : new string[] { };

var abbreviations = lookup!.GetAbbreviationsForUnit(unitValue);
if(abbreviations.Count == 0)
return formatProvider != FallbackCulture ? GetUnitAbbreviations(unitType, unitValue, FallbackCulture) : new string[] { };
var abbreviations = new HashSet<string>();
abbreviations.UnionWith(lookup!.GetAbbreviationsForUnit(unitValue));

if(formatProvider != FallbackCulture)
abbreviations.UnionWith(GetUnitAbbreviations(unitType, unitValue, FallbackCulture));
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At first glance, I'm not sure about this union.

If you call GetUnitAbbreviations(typeof(LengthUnit), 1, russianCulture) then from this public method signature, isn't it unexpected to also receive English abbreviations?

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A good question :) Should it? Currently you can get English abbreviations from GetUnitAbbreviations, but only if no Russian ones exist.

The parser obviously will not fall back without it. It's either that, or the parser logic will need to include the fallback logic. I wanted to keep everything contained.

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I'm really not sure. How about adding a new parameter bool includeFallbackCulture = false and call it with true from our own usages where we need to?

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I still think we should not do a union here indiscriminately. What do you think of my proposal of a new argument?


return abbreviations.ToArray();
}
Expand All @@ -297,10 +299,32 @@ public string[] GetAllUnitAbbreviationsForQuantity(Type unitEnumType, IFormatPro
if(!TryGetUnitValueAbbreviationLookup(unitEnumType, formatProvider, out var lookup))
return formatProvider != FallbackCulture ? GetAllUnitAbbreviationsForQuantity(unitEnumType, FallbackCulture) : new string[] { };

return lookup!.GetAllUnitAbbreviationsForQuantity();
var allAbbreviations = new HashSet<string>();
allAbbreviations.UnionWith(lookup!.GetAllUnitAbbreviationsForQuantity());

if(formatProvider != FallbackCulture)
allAbbreviations.UnionWith(GetAllUnitAbbreviationsForQuantity(unitEnumType, FallbackCulture));

return allAbbreviations.ToArray();
}

internal List<int> GetUnitsForAbbreviation(Type unitType, IFormatProvider? formatProvider, string abbreviation, bool ignoreCase)
{
formatProvider = formatProvider ?? CultureInfo.CurrentUICulture;

if(!TryGetUnitValueAbbreviationLookup(unitType, formatProvider, out var lookup))
return formatProvider != FallbackCulture ? GetUnitsForAbbreviation(unitType, FallbackCulture, abbreviation, ignoreCase) : new List<int>();

var units = new HashSet<int>();
units.UnionWith(lookup!.GetUnitsForAbbreviation(abbreviation, ignoreCase));

if(formatProvider != FallbackCulture)
units.UnionWith(GetUnitsForAbbreviation(unitType, FallbackCulture, abbreviation, ignoreCase));

return units.ToList();
}

internal bool TryGetUnitValueAbbreviationLookup(Type unitType, IFormatProvider? formatProvider, out UnitValueAbbreviationLookup? unitToAbbreviations)
private bool TryGetUnitValueAbbreviationLookup(Type unitType, IFormatProvider? formatProvider, out UnitValueAbbreviationLookup? unitToAbbreviations)
{
unitToAbbreviations = null;

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18 changes: 6 additions & 12 deletions UnitsNet/CustomCode/UnitParser.cs
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Expand Up @@ -72,20 +72,17 @@ public Enum Parse([NotNull] string unitAbbreviation, Type unitType, IFormatProvi
if (unitAbbreviation == null) throw new ArgumentNullException(nameof(unitAbbreviation));
unitAbbreviation = unitAbbreviation.Trim();

if(!_unitAbbreviationsCache.TryGetUnitValueAbbreviationLookup(unitType, formatProvider, out var abbreviations))
throw new UnitNotFoundException($"No abbreviations defined for unit type [{unitType}] for culture [{formatProvider}].");

var unitIntValues = abbreviations!.GetUnitsForAbbreviation(unitAbbreviation, ignoreCase: true);
var unitIntValues = _unitAbbreviationsCache.GetUnitsForAbbreviation(unitType, formatProvider, unitAbbreviation, ignoreCase: true);

if (unitIntValues.Count == 0)
{
unitAbbreviation = NormalizeUnitString(unitAbbreviation);
unitIntValues = abbreviations.GetUnitsForAbbreviation(unitAbbreviation, ignoreCase: true);
unitIntValues = _unitAbbreviationsCache.GetUnitsForAbbreviation(unitType, formatProvider, unitAbbreviation, ignoreCase: true);
}

// Narrow the search if too many hits, for example Megabar "Mbar" and Millibar "mbar" need to be distinguished
if (unitIntValues.Count > 1)
unitIntValues = abbreviations.GetUnitsForAbbreviation(unitAbbreviation, ignoreCase: false);
unitIntValues = _unitAbbreviationsCache.GetUnitsForAbbreviation(unitType, formatProvider, unitAbbreviation, ignoreCase: false);

switch (unitIntValues.Count)
{
Expand Down Expand Up @@ -197,20 +194,17 @@ public bool TryParse(string? unitAbbreviation, Type unitType, IFormatProvider? f
unitAbbreviation = unitAbbreviation.Trim();
unit = default;

if(!_unitAbbreviationsCache.TryGetUnitValueAbbreviationLookup(unitType, formatProvider, out var abbreviations))
return false;

var unitIntValues = abbreviations!.GetUnitsForAbbreviation(unitAbbreviation, ignoreCase: true);
var unitIntValues = _unitAbbreviationsCache.GetUnitsForAbbreviation(unitType, formatProvider, unitAbbreviation, ignoreCase: true);

if (unitIntValues.Count == 0)
{
unitAbbreviation = NormalizeUnitString(unitAbbreviation);
unitIntValues = abbreviations.GetUnitsForAbbreviation(unitAbbreviation, ignoreCase: true);
unitIntValues = _unitAbbreviationsCache.GetUnitsForAbbreviation(unitType, formatProvider, unitAbbreviation, ignoreCase: true);
}

// Narrow the search if too many hits, for example Megabar "Mbar" and Millibar "mbar" need to be distinguished
if (unitIntValues.Count > 1)
unitIntValues = abbreviations.GetUnitsForAbbreviation(unitAbbreviation, ignoreCase: false);
unitIntValues = _unitAbbreviationsCache.GetUnitsForAbbreviation(unitType, formatProvider, unitAbbreviation, ignoreCase: false);

if(unitIntValues.Count != 1)
return false;
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1 change: 0 additions & 1 deletion UnitsNet/CustomCode/UnitValueAbbreviationLookup.cs
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Expand Up @@ -73,7 +73,6 @@ internal void Add(int unit, string abbreviation, bool setAsDefault = false)
abbreviationsForUnit.Insert(0, abbreviation);
else
abbreviationsForUnit.Add(abbreviation);

}
}
}